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feat(ecss): establish independent cascade engine

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Create the lowercase ecss repository as a pure selector and CSS cascade package with no TP, Ebox, or historical ECSS dependency.\n\nVerified with 47 ERT tests, warning-free byte compilation, checkdoc, and git diff checks.
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the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# Makefile for the ecss library.
EMACS ?= emacs
LOADPATH = -L . -L tests
PACKAGE_LINT_LOAD_EXTRA ?=
SRC = ecss-selector.el ecss-cascade.el ecss.el
TESTS = $(wildcard tests/*-tests.el)
.PHONY: test compile compile-all checkdoc package-lint check clean diff-check
test: clean
$(EMACS) -Q --batch $(LOADPATH) -l ecss.el \
$(patsubst %,-l %,$(TESTS)) -f ert-run-tests-batch-and-exit
compile: clean
$(EMACS) -Q --batch $(LOADPATH) \
--eval '(setq byte-compile-error-on-warn t)' \
-f batch-byte-compile $(SRC)
compile-all: clean
$(EMACS) -Q --batch $(LOADPATH) \
--eval '(setq byte-compile-error-on-warn t)' \
-f batch-byte-compile $(SRC) $(TESTS)
checkdoc:
$(EMACS) -Q --batch $(LOADPATH) \
--eval '(progn (require (quote cl-lib)) (require (quote checkdoc)) \
(cl-letf (((symbol-function (quote display-warning)) \
(lambda (_type message &rest _args) (error "%s" message)))) \
(dolist (file (quote ("ecss-selector.el" "ecss-cascade.el" "ecss.el"))) \
(checkdoc-file file))))'
package-lint:
$(EMACS) -Q --batch $(LOADPATH) $(PACKAGE_LINT_LOAD_EXTRA) \
--eval '(progn (require (quote package-lint)) \
(setq package-lint-main-file "ecss.el") \
(dolist (file (quote ("ecss-selector.el" "ecss-cascade.el" "ecss.el"))) \
(with-current-buffer (find-file-noselect file) \
(let ((issues (package-lint-buffer))) \
(when issues (error "package-lint failed for %s: %S" file issues))))))'
diff-check:
git diff --check
check: compile-all test checkdoc diff-check
$(MAKE) clean
clean:
rm -f *.elc tests/*.elc

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# ecss
[中文](README.md)
`ecss` is an independent, pure, extensible CSS cascade engine for Emacs Lisp. It owns selectors, specificity, stylesheets, origins and importance, cascade layers, CSS-wide values, custom properties, `var()`, inheritance, computed styles, and provenance. It does not own text-property writes, reactive updates, buffer publication, or Box/Flex/Grid layout.
This repository is a new lowercase `ecss` project. It neither modifies nor depends on the historical uppercase `ECSS` repository, and it provides no forwarding compatibility layer to that project.
## Independent use
`ecss` does not embed Ebox properties and does not require TP. Any program can register its own property vocabulary, expose nodes through built-in `ecss-subject` values or an adapter, and receive a pure-data computed style. The caller decides whether those values drive text, widgets, a DOM, layout, diagnostics, or another domain.
```elisp
(require 'ecss)
(let ((schemas (ecss-schema-set-create))
(sheet (ecss-stylesheet-create))
(button (ecss-subject-create
:type "button" :classes '("primary"))))
(ecss-schema-set-define
schemas 'demo/color :initial "black" :inherits t :validator #'stringp)
(ecss-stylesheet-add-rule
sheet schemas "button.primary" '(demo/color "royalblue"))
(ecss-computed-style-value
(ecss-compute-style schemas button :stylesheet sheet)
'demo/color))
;; => "royalblue"
```
## Core boundary
- `ecss-selector.el` owns the selector AST, parser, matcher, specificity, and generic subject adapter.
- `ecss-cascade.el` owns explicit schema sets, stylesheets, complete winner ordering, inheritance, variable resolution, and provenance.
- `ecss.el` is the public package facade and has no behavioral load side effects.
- Schema sets and stylesheets change only through explicit authoring APIs. `ecss-compute-style` mutates neither its inputs nor the current buffer.
- An ordinary function value always remains a value. ECSS calls code only through an explicitly supplied `:value-resolver`; ECSS itself knows nothing about TP bindings, Ebox nodes, or consumer-specific value-source types.
See [Architecture](docs/architecture.en.md) and [API Reference](docs/api.en.md) for the complete contract.
## Verification
```sh
make test EMACS=/Applications/Emacs.app/Contents/MacOS/Emacs
make compile EMACS=/Applications/Emacs.app/Contents/MacOS/Emacs
make checkdoc EMACS=/Applications/Emacs.app/Contents/MacOS/Emacs
make package-lint EMACS=/Applications/Emacs.app/Contents/MacOS/Emacs
make diff-check
```
`package-lint` is an external development tool. If it is absent from the `emacs -Q` load path, provide it explicitly with `PACKAGE_LINT_LOAD_EXTRA='-L /path/to/package-lint'`. It is not an `ecss` runtime dependency.
The minimum Emacs version is 28.1. The current package version is 0.1.0.

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# ecss
[English](README.en.md)
`ecss` 是一个独立、纯计算、可扩展的 Emacs Lisp CSS 层叠引擎。它负责 selector、specificity、stylesheet、origin/importance、cascade layer、CSS-wide value、custom property、`var()`、inheritance、computed style 与 provenance；它不负责文本属性写入、响应式更新、Buffer 提交或 Box/Flex/Grid 布局。
这个仓库是全新的小写 `ecss` 项目，不修改、不依赖、也不兼容转发到历史大写 `ECSS` 仓库。
## 为什么能独立使用
`ecss` 不内置 Ebox 属性，也不要求 TP。普通程序可以注册自己的属性 vocabulary，用内置 `ecss-subject` 或 adapter 暴露任意树节点，然后取得纯数据 computed style。调用者自行决定这些值用于文本、Widget、DOM、布局、日志还是其他领域。
```elisp
(require 'ecss)
(let ((schemas (ecss-schema-set-create))
(sheet (ecss-stylesheet-create))
(button (ecss-subject-create
:type "button" :classes '("primary"))))
(ecss-schema-set-define
schemas 'demo/color :initial "black" :inherits t :validator #'stringp)
(ecss-stylesheet-add-rule
sheet schemas "button.primary" '(demo/color "royalblue"))
(ecss-computed-style-value
(ecss-compute-style schemas button :stylesheet sheet)
'demo/color))
;; => "royalblue"
```
## 核心边界
- `ecss-selector.el`：selector AST/parser/matcher/specificity 与通用 subject adapter。
- `ecss-cascade.el`：显式 schema set、stylesheet、完整 winner 顺序、继承、变量解析和 provenance。
- `ecss.el`：公开 package facade；加载时没有行为副作用。
- schema set 和 stylesheet 只在显式 authoring API 中修改；`ecss-compute-style` 不修改输入对象或当前 Buffer。
- 普通 function value 永远是普通值。只有调用者显式传入 `:value-resolver` 时，ECSS 才调用该 resolver；ECSS 自己不认识 TP binding、Ebox node 或任何业务 value-source 类型。
详细设计见 [架构](docs/architecture.zh.md) 与 [API 参考](docs/api.zh.md)。
## 验证
```sh
make test EMACS=/Applications/Emacs.app/Contents/MacOS/Emacs
make compile EMACS=/Applications/Emacs.app/Contents/MacOS/Emacs
make checkdoc EMACS=/Applications/Emacs.app/Contents/MacOS/Emacs
make package-lint EMACS=/Applications/Emacs.app/Contents/MacOS/Emacs
make diff-check
```
`package-lint` 是开发期外部工具；如果它不在 `emacs -Q` 的 load-path 中，通过 `PACKAGE_LINT_LOAD_EXTRA='-L /path/to/package-lint'` 显式提供。它不是 `ecss` 的运行时依赖。
最低 Emacs 版本是 28.1。当前 package 版本是 0.1.0。

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# ecss API Reference
[中文](api.zh.md)
## Schemas
- `(ecss-schema-set-create)` creates an isolated registry.
- `(ecss-schema-set-define SCHEMAS ID &rest OPTIONS)` atomically registers a namespaced property. OPTIONS are `:initial`, `:inherits`, `:normalizer`, `:validator`, `:equality`, and `:shorthand`.
- `(ecss-schema-set-property SCHEMAS ID)` returns a defensive schema copy.
- `(ecss-schema-set-property-ids SCHEMAS)` returns stable registration order.
- `(ecss-expand-declarations SCHEMAS DECLARATIONS)` validates properties and expands each shorthand once.
A property ID is a symbol containing `/`, such as `ebox/color`. Custom properties need no schema and use `--name` symbols. `initial` is normalized and validated once at schema registration; already computed initial and inherited values do not run the normalizer again.
## Subjects and selectors
- `(ecss-subject-create &key type id classes attributes states parent children)` creates a built-in subject.
- `(ecss-subject-adapter-create &key type id classes attributes states parent children)` adapts caller-owned nodes.
- `(ecss-selector-parse STRING)` returns an AST.
- `(ecss-selector-normalize SELECTOR)` accepts a string or AST and returns a defensive AST.
- `(ecss-selector-match-p SELECTOR SUBJECT &optional ADAPTER)` matches a subject.
- `(ecss-selector-specificity SELECTOR)` returns `(ID CLASS TYPE)`.
The parser supports selector lists, compound selectors, type/id/class, attribute presence/equality/token/language/prefix/suffix/substring matching, state pseudos, `:is()`, `:where()`, `:not()`, `:has()`, and descendant/child/adjacent/general-sibling combinators. `:has()` accepts relative selector lists, including `:has(> child)`, `:has(+ sibling)`, `:has(~ sibling)`, and chained relationships. An unknown functional pseudo is preserved as a state token; the adapter's `states` result determines whether it matches.
## Stylesheets
- `(ecss-stylesheet-create)` creates an isolated stylesheet.
- `(ecss-stylesheet-declare-layers STYLESHEET LAYERS &optional ORIGIN)` predeclares an independent layer order for one origin. ORIGIN defaults to `author`.
- `(ecss-stylesheet-add-rule STYLESHEET SCHEMAS SELECTOR DECLARATIONS &key origin layer scope)` atomically adds a rule.
- `(ecss-stylesheet-rules STYLESHEET)` and `(ecss-stylesheet-layers STYLESHEET &optional ORIGIN)` return defensive copies.
- `(ecss-stylesheet-clear STYLESHEET)` clears the explicit object.
ORIGIN is `ua`, `user`, `author`, `animation`, or `transition`. Inline declarations do not enter a stylesheet; pass them as compute-time `:declarations`.
## Values and computation
- `(ecss-important VALUE)` tags `!important`.
- `(ecss-wide-value KIND)` creates a tagged `initial`, `inherit`, `unset`, `revert`, or `revert-layer` value. An ordinary symbol with the same name remains ordinary data.
- `(ecss-var NAME &optional FALLBACK)` creates a custom-property reference.
- `(ecss-compute-style SCHEMAS SUBJECT &key stylesheet rules declarations parent-style adapter provenance value-resolver)` returns an `ecss-computed-style`.
Do not pass both `:stylesheet` and `:rules`. `:rules` accepts the rule list returned by `ecss-stylesheet-rules` for immutable snapshot storage and replay. `:parent-style` may be a computed style or an already computed values plist. Winner facts are retained only with `:provenance t`. `:value-resolver` has signature `(VALUE PROPERTY SUBJECT)`; without it ECSS calls no property value.
## Computed styles
- `(ecss-computed-style-values STYLE)` returns a defensive values plist.
- `(ecss-computed-style-custom-properties STYLE)` returns a deterministic custom-property plist.
- `(ecss-computed-style-active-properties STYLE)` returns property IDs supplied by valid declarations or active inheritance, preserving explicit nil versus absence. An invalid winner falling back to the initial value is not presented as an active declaration.
- `(ecss-computed-style-provenance STYLE)` returns winner, origin, importance, layer, specificity, scope/source/declaration order, validity, and fallback facts.
- `(ecss-computed-style-diagnostics STYLE)` returns deterministic diagnostics such as custom-property cycles.
- `(ecss-computed-style-value STYLE PROPERTY &optional FALLBACK)` reads one value.
- `(ecss-computed-style-present-p STYLE PROPERTY)` detects an active property even when its value is nil.
Every aggregate getter returns a defensive copy. Mutating a returned value cannot change a computed style, schema set, or stylesheet.

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# ecss API 参考
[English](api.en.md)
## Schema
- `(ecss-schema-set-create)` 创建隔离 registry。
- `(ecss-schema-set-define SCHEMAS ID &rest OPTIONS)` 原子注册 namespaced property。OPTIONS 是 `:initial`、`:inherits`、`:normalizer`、`:validator`、`:equality`、`:shorthand`。
- `(ecss-schema-set-property SCHEMAS ID)` 返回 defensive schema copy。
- `(ecss-schema-set-property-ids SCHEMAS)` 返回稳定注册顺序。
- `(ecss-expand-declarations SCHEMAS DECLARATIONS)` 校验属性并只展开一次 shorthand。
Property ID 必须是包含 `/` 的 symbol，例如 `ebox/color`。Custom property 不需要 schema，使用 `--name` symbol。`initial` 在 schema 注册时规范化并校验一次；已计算的 initial/inherited value 不会再次执行 normalizer。
## Subject 与 selector
- `(ecss-subject-create &key type id classes attributes states parent children)` 创建内置 subject。
- `(ecss-subject-adapter-create &key type id classes attributes states parent children)` 为 caller-owned node 创建 adapter。
- `(ecss-selector-parse STRING)` 返回 AST。
- `(ecss-selector-normalize SELECTOR)` 接受 string 或 AST，返回 defensive AST。
- `(ecss-selector-match-p SELECTOR SUBJECT &optional ADAPTER)` 执行匹配。
- `(ecss-selector-specificity SELECTOR)` 返回 `(ID CLASS TYPE)`。
Parser 支持 selector list、compound selector、type/id/class、attribute presence/equality/token/language/prefix/suffix/substring、state pseudo、`:is()`、`:where()`、`:not()`、`:has()`，以及 descendant/child/adjacent/general-sibling combinator。`:has()` 使用相对 selector list，支持 `:has(> child)`、`:has(+ sibling)`、`:has(~ sibling)` 及其后续复合关系。未知 functional pseudo 被保存为 state token，由 adapter 的 `states` 决定是否匹配。
## Stylesheet
- `(ecss-stylesheet-create)` 创建隔离 stylesheet。
- `(ecss-stylesheet-declare-layers STYLESHEET LAYERS &optional ORIGIN)` 为一个 origin 预声明独立 layer order；ORIGIN 默认是 `author`。
- `(ecss-stylesheet-add-rule STYLESHEET SCHEMAS SELECTOR DECLARATIONS &key origin layer scope)` 原子添加 rule。
- `(ecss-stylesheet-rules STYLESHEET)` 与 `(ecss-stylesheet-layers STYLESHEET &optional ORIGIN)` 返回 defensive copies。
- `(ecss-stylesheet-clear STYLESHEET)` 清空显式对象。
ORIGIN 是 `ua`、`user`、`author`、`animation` 或 `transition`。Inline declarations 不放入 stylesheet，而通过 compute 的 `:declarations` 传入。
## Values 与 computation
- `(ecss-important VALUE)` 标记 `!important`。
- `(ecss-wide-value KIND)` 创建 `initial`、`inherit`、`unset`、`revert` 或 `revert-layer` tagged value；同名普通 symbol 保持普通值。
- `(ecss-var NAME &optional FALLBACK)` 创建 custom-property reference。
- `(ecss-compute-style SCHEMAS SUBJECT &key stylesheet rules declarations parent-style adapter provenance value-resolver)` 返回 `ecss-computed-style`。
不能同时传 `:stylesheet` 与 `:rules`。`:rules` 接受 `ecss-stylesheet-rules` 返回的 rule list，适用于不可变 snapshot 的保存和重放。`:parent-style` 可以是 computed style，也可以是已经计算完成的 values plist。`:provenance t` 才保留 winner facts。`:value-resolver` 的签名是 `(VALUE PROPERTY SUBJECT)`；未提供时 ECSS 不调用任何 property value。
## Computed style
- `(ecss-computed-style-values STYLE)` 返回 defensive values plist。
- `(ecss-computed-style-custom-properties STYLE)` 返回 deterministic custom-property plist。
- `(ecss-computed-style-active-properties STYLE)` 返回由有效 declaration 或 active inheritance 实际提供的 property ids，保留 explicit nil 与 absence 的区别；invalid winner 回退到 initial 时不伪装成 active declaration。
- `(ecss-computed-style-provenance STYLE)` 返回 winner、origin、important、layer、specificity、scope/source/declaration order、valid/fallback 等事实。
- `(ecss-computed-style-diagnostics STYLE)` 返回 custom-property cycle 等 deterministic diagnostics。
- `(ecss-computed-style-value STYLE PROPERTY &optional FALLBACK)` 读取单值。
- `(ecss-computed-style-present-p STYLE PROPERTY)` 判断 property 是否 active，即使值为 nil。
所有 aggregate getter 都返回 defensive copy。调用者修改返回值不会改变 computed style、schema set 或 stylesheet。

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# ecss Architecture
[中文](architecture.zh.md)
## Position
`ecss` is the generic pure-computation layer that answers which rule wins and what each final property value is. It transforms consumer-provided property schemas, subjects, stylesheets, inline declarations, and a parent computed style into computed values, custom properties, active properties, provenance, and diagnostics.
```text
consumer schemas + subject adapter + stylesheet + parent style
│
▼
selector match → candidate collection → cascade winner
│
▼
CSS-wide/custom-property resolution → normalize/validate
│
▼
computed style + provenance + diagnostics
```
`ecss` does not know how computed values are displayed. TP may convert final text-property contributions into retained surface patches. Ebox may interpret final Box/Flex/Grid properties as measurement, layout, and painting consequences. Ordinary callers may use `ecss` without either package.
## Explicit objects instead of process-global state
Each consumer creates its own `ecss-schema-set` and `ecss-stylesheet`. Two applications can use the same selector tokens, different property vocabularies, and different layer orders in one Emacs process without interference. UA, user, and author origins inside one stylesheet also keep independent layer orders. Schema registration and rule addition are explicit atomic authoring operations. Failure cannot leave a partial schema, a half-added layer, or an incorrect source order.
## Subjects and adapters
Simple callers use `ecss-subject` directly. Existing tree models use `ecss-subject-adapter-create` to provide type, id, classes, attributes, states, parent, and children callbacks without copying business nodes into ECSS nodes. Selector queries and stylesheets share one parser, matcher, and specificity implementation, so query matching cannot drift from rule matching.
## Cascade order
Candidates compare by CSS order: relevance and matching, origin plus importance, cascade layer, specificity, scope proximity, source order, and declaration order. Standard origin levels are UA normal, user normal, author normal, animation, author important, user important, UA important, and transition. Later normal layers win and unlayered normal declarations beat layered ones. Important layers reverse order. Inline author declarations retain the highest priority inside the author origin.
`revert` removes the entire current origin, across normal and important declarations, before choosing again. `revert-layer` removes the entire current layer inside that origin. An invalid-at-computed-value winner never recascades to a lower candidate; it uses the inherited or initial fallback and records the invalid winner in provenance.
## Value-source boundary
ECSS never calls an ordinary function stored in a property and defines no reactive or computed wrapper. A caller that needs evaluation explicitly passes `:value-resolver` to `ecss-compute-style`. The resolver receives value, property, and subject. ECSS invokes it once for each selected source and never executes its result a second time. Resolver errors propagate. Because computation is pure, ECSS has no buffer or runtime state to roll back.
## Custom properties
Custom properties use `--name` symbols. Their raw values first pass through ordinary cascade, inherit from the parent computed style by default, and then resolve through `ecss-var`. References may occur inside lists or vectors. Missing values and cycles can use fallback at the reference site. A cycle does not destroy the whole computed style: it creates a deterministic diagnostic and makes the affected value invalid at computed-value time.
## Three-package boundary
```text
ecss: selector / stylesheet / cascade / computed values
tp: text-property contributions / reactive runtime / diff / transaction / buffer commit
ebox: box semantics / measurement / flex-grid layout / painting / dirty ownership
```
Ebox may consume both `ecss` and TP. `ecss` and TP remain independently usable and do not depend on each other. The `ecss` public API contains no TP object, binding, or mount; no Ebox node; and no marker, patch, or buffer mutation.

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# ecss 架构
[English](architecture.en.md)
## 定位
`ecss` 是“规则如何赢、最终属性值是什么”的通用纯计算层。它把 consumer 提供的 property schemas、subjects、stylesheets、inline declarations 与 parent computed style 转换成 computed values、custom properties、active properties、provenance 和 diagnostics。
```text
consumer schemas + subject adapter + stylesheet + parent style
│
▼
selector match → candidate collection → cascade winner
│
▼
CSS-wide/custom-property resolution → normalize/validate
│
▼
computed style + provenance + diagnostics
```
`ecss` 不知道 computed values 最终如何显示。TP 可以把最终文本属性贡献转换成 retained surface patch；Ebox 可以把最终 Box/Flex/Grid 属性解释成 measurement、layout 与 painting 后果；普通调用者也可以完全不用 TP/Ebox。
## 显式对象而不是进程全局状态
每个 consumer 创建自己的 `ecss-schema-set` 与 `ecss-stylesheet`。两个应用可以在同一 Emacs 中使用同名 selector token、不同 property vocabulary 和不同 layer 顺序而互不污染；同一 stylesheet 中的 UA、user 与 author origin 也分别维护自己的 layer order。schema 注册与 rule 添加是显式、原子的 authoring 操作；一次失败不会留下半注册 schema、半添加 layer 或错误 source order。
## Subject 与 adapter
简单场景直接使用 `ecss-subject`。已有树模型通过 `ecss-subject-adapter-create` 提供 type、id、classes、attributes、states、parent 与 children callback，不需要把业务节点复制成 ECSS node。selector query 与 stylesheet 都调用同一个 parser、matcher 和 specificity 实现，因此不会出现“查询能匹配但样式规则不能匹配”的两套语义。
## Cascade 顺序
候选值按 CSS 顺序比较：relevance/match、origin+importance、cascade layer、specificity、scope proximity、source order、declaration order。标准 origin level 是 UA normal、user normal、author normal、animation、author important、user important、UA important、transition。normal layer 后声明者优先且 unlayered 高于 layered；important layer 反向，inline author declaration 在 author origin 内保持最高优先级。
`revert` 删除当前整个 origin 后重新选择，不区分 normal 与 important；`revert-layer` 删除当前 origin 中的整个 layer 后重新选择。invalid-at-computed-value 不会退回较低候选，而是使用 inherited/initial fallback，并在 provenance 中记录 invalid winner。
## Value source 边界
ECSS 不自动调用属性里的 function，也不定义自己的 reactive/computed wrapper。调用者需要求值时，显式向 `ecss-compute-style` 传入 `:value-resolver`。resolver 接收 value、property、subject，ECSS 对每个被选中的 source 只调用一次，resolver 返回值不会被二次执行。resolver error 直接向外传播；由于 computation 是纯计算，不存在需要 ECSS 回滚的 Buffer 或 runtime state。
## Custom properties
Custom properties 使用 `--name` symbol，通过普通 cascade 选出 raw value，默认从 parent computed style 继承，再用 `ecss-var` 解析。引用可以嵌套在 list/vector 中；缺失值与 cycle 可使用引用处 fallback。cycle 不破坏整个 computed style，而产生 deterministic diagnostic，并把受影响 value 标记为 invalid-at-computed-value。
## 三包边界
```text
ecss: selector / stylesheet / cascade / computed values
tp: text-property contributions / reactive runtime / diff / transaction / buffer commit
ebox: box semantics / measurement / flex-grid layout / painting / dirty ownership
```
允许的依赖方向是 Ebox 消费 `ecss` 与 TP；`ecss` 和 TP 可以彼此完全独立使用。`ecss` public API 不出现 TP object/binding/mount、Ebox node、marker、patch 或 buffer mutation。

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;;; ecss-cascade.el --- Pure CSS cascade computation -*- lexical-binding: t; -*-
;; Copyright (C) 2026 Geekinney
;; SPDX-License-Identifier: GPL-3.0-or-later
;;; Commentary:
;; This module owns property schemas, stylesheets, cascade precedence,
;; inheritance, CSS-wide values, custom properties, and provenance. All
;; computation is independent of buffers, text properties, TP, and Ebox.
;;; Code:
(require 'cl-lib)
(require 'seq)
(require 'subr-x)
(require 'ecss-selector)
(define-error 'ecss-invalid-property-schema
"Invalid ECSS property schema" 'ecss-error)
(define-error 'ecss-invalid-declaration
"Invalid ECSS declaration" 'ecss-error)
(define-error 'ecss-invalid-rule "Invalid ECSS rule" 'ecss-error)
(cl-defstruct (ecss-property-schema
(:constructor ecss--make-property-schema))
"Schema governing one namespaced cascade property."
id initial inherits normalizer validator equality shorthand)
(cl-defstruct (ecss-schema-set
(:constructor ecss--make-schema-set)
(:conc-name ecss--schema-set-))
"Explicit registry of consumer-owned property schemas."
table order)
(cl-defstruct (ecss-stylesheet
(:constructor ecss--make-stylesheet)
(:conc-name ecss--stylesheet-))
"Ordered rules and cascade layers with no global state."
rules layers source-order)
(cl-defstruct (ecss-rule (:constructor ecss--make-rule))
"One validated stylesheet rule."
selector declarations origin layer layer-rank scope source-order)
(cl-defstruct (ecss-computed-style
(:constructor ecss--make-computed-style)
(:conc-name ecss--computed-style-))
"Computed declarations, custom properties, provenance, and diagnostics."
values custom-properties active-properties provenance diagnostics)
(cl-defstruct (ecss--wide (:constructor ecss--make-wide)) kind)
(cl-defstruct (ecss--important (:constructor ecss--make-important)) value)
(cl-defstruct (ecss--var-ref (:constructor ecss--make-var-ref))
name fallback-present-p fallback)
(cl-defstruct (ecss--candidate (:constructor ecss--make-candidate))
property value origin important inline layer layer-rank specificity
scope-distance source-order declaration-order selector)
(defconst ecss--schema-option-keys
'(:initial :inherits :normalizer :validator :equality :shorthand)
"Accepted property schema option keys.")
(defconst ecss--origins '(ua user author animation transition)
"Supported standard CSS cascade origins.")
(defconst ecss--wide-kinds '(initial inherit unset revert revert-layer)
"Supported CSS-wide value kinds.")
(defconst ecss--invalid (make-symbol "ecss-invalid-value"))
(defconst ecss--absent (make-symbol "ecss-absent-value"))
(defun ecss-schema-set-create ()
"Create an empty independent property schema set."
(ecss--make-schema-set :table (make-hash-table :test #'eq) :order nil))
(defun ecss--schema-set-check (schemas)
"Return SCHEMAS or signal when it is not a schema set."
(unless (ecss-schema-set-p schemas)
(signal 'wrong-type-argument (list 'ecss-schema-set-p schemas)))
schemas)
(defun ecss--canonical-property-id-p (id)
"Return non-nil when ID is a namespaced property symbol."
(and (symbolp id)
(let ((name (symbol-name id)))
(and (string-match-p "/" name)
(not (string-prefix-p "/" name))
(not (string-suffix-p "/" name))))))
(defun ecss--custom-property-p (property)
"Return non-nil when PROPERTY names a custom property."
(and (symbolp property)
(string-prefix-p "--" (symbol-name property))))
(defun ecss--options-valid-p (options)
"Return non-nil when OPTIONS is an accepted property option plist."
(and (listp options)
(zerop (% (length options) 2))
(cl-loop for key in options by #'cddr
always (memq key ecss--schema-option-keys))))
(defun ecss--schema-option (options key fallback)
"Return KEY from OPTIONS when present, otherwise FALLBACK."
(if (plist-member options key) (plist-get options key) fallback))
(defun ecss--validate-schema-functions (options)
"Validate callable schema fields in OPTIONS."
(dolist (key '(:normalizer :validator :equality :shorthand))
(let ((value (plist-get options key)))
(unless (or (null value) (functionp value))
(signal 'ecss-invalid-property-schema (list key value))))))
(defun ecss--normalize-schema-initial (initial normalizer validator)
"Normalize and validate schema INITIAL with NORMALIZER and VALIDATOR."
(let ((normalized (funcall normalizer (copy-tree initial))))
(unless (funcall validator normalized)
(signal 'ecss-invalid-property-schema
(list :invalid-initial initial)))
normalized))
(defun ecss--build-property-schema (id options)
"Build a validated property schema for ID from OPTIONS."
(unless (and (ecss--canonical-property-id-p id)
(ecss--options-valid-p options))
(signal 'ecss-invalid-property-schema (list :property id options)))
(ecss--validate-schema-functions options)
(let* ((normalizer (ecss--schema-option options :normalizer #'identity))
(validator (ecss--schema-option
options :validator (lambda (_value) t)))
(initial (ecss--normalize-schema-initial
(plist-get options :initial) normalizer validator)))
(ecss--make-property-schema
:id id :initial initial
:inherits (and (plist-get options :inherits) t)
:normalizer normalizer :validator validator
:equality (ecss--schema-option options :equality #'equal)
:shorthand (plist-get options :shorthand))))
;;;###autoload
(defun ecss-schema-set-define (schemas id &rest options)
"Atomically define property ID with OPTIONS in SCHEMAS."
(ecss--schema-set-check schemas)
(let* ((schema (ecss--build-property-schema id options))
(table (ecss--schema-set-table schemas)))
(unless (gethash id table)
(setf (ecss--schema-set-order schemas)
(append (ecss--schema-set-order schemas) (list id))))
(puthash id schema table)
(ecss--copy-property-schema schema)))
(defun ecss--copy-property-schema (schema)
"Return a defensive copy of SCHEMA."
(let ((copy (copy-ecss-property-schema schema)))
(setf (ecss-property-schema-initial copy)
(copy-tree (ecss-property-schema-initial schema)))
copy))
(defun ecss-schema-set-property (schemas id)
"Return a defensive copy of property ID from SCHEMAS, or nil."
(ecss--schema-set-check schemas)
(when-let ((schema (gethash id (ecss--schema-set-table schemas))))
(ecss--copy-property-schema schema)))
(defun ecss-schema-set-property-ids (schemas)
"Return property identifiers from SCHEMAS in registration order."
(ecss--schema-set-check schemas)
(copy-sequence (ecss--schema-set-order schemas)))
(defun ecss-schema-set-clear (schemas)
"Remove every property schema from SCHEMAS."
(ecss--schema-set-check schemas)
(clrhash (ecss--schema-set-table schemas))
(setf (ecss--schema-set-order schemas) nil)
schemas)
(defun ecss-property-equal-p (schemas property left right)
"Return whether PROPERTY values LEFT and RIGHT are equal in SCHEMAS."
(ecss--schema-set-check schemas)
(let ((schema (gethash property (ecss--schema-set-table schemas))))
(unless schema
(signal 'ecss-invalid-declaration (list :unknown-property property)))
(funcall (ecss-property-schema-equality schema) left right)))
;;;###autoload
(defun ecss-wide-value (kind)
"Return a tagged CSS-wide value of KIND."
(unless (memq kind ecss--wide-kinds)
(signal 'ecss-invalid-declaration (list :wide-value kind)))
(ecss--make-wide :kind kind))
;;;###autoload
(defun ecss-important (value)
"Return VALUE tagged as an important declaration."
(ecss--make-important :value value))
;;;###autoload
(defun ecss-var (name &rest fallback)
"Return a custom property reference to NAME with optional FALLBACK."
(unless (ecss--custom-property-p name)
(signal 'ecss-invalid-declaration (list :custom-property name)))
(when (> (length fallback) 1)
(signal 'wrong-number-of-arguments
(list 'ecss-var (+ 1 (length fallback)))))
(ecss--make-var-ref
:name name :fallback-present-p (and fallback t) :fallback (car fallback)))
(defun ecss--declaration-list-p (declarations)
"Return non-nil when DECLARATIONS is an even property/value list."
(and (listp declarations) (zerop (% (length declarations) 2))))
(defun ecss--schema-for (schemas property)
"Return PROPERTY schema from SCHEMAS, or nil."
(gethash property (ecss--schema-set-table schemas)))
(defun ecss--validate-declaration-property (schemas property)
"Return PROPERTY when it is valid for SCHEMAS."
(unless (or (ecss--custom-property-p property)
(ecss--schema-for schemas property))
(signal 'ecss-invalid-declaration (list :unknown-property property)))
property)
(defun ecss--unwrap-important (value)
"Return VALUE paired with whether it carries an important tag."
(if (ecss--important-p value)
(cons (ecss--important-value value) t)
(cons value nil)))
(defun ecss--tag-important (declarations important)
"Tag DECLARATIONS as IMPORTANT when requested."
(if (not important)
declarations
(cl-loop for (property value) on declarations by #'cddr
append (list property (ecss-important value)))))
(defun ecss--validate-expanded-longhands (schemas shorthand declarations)
"Validate SHORTHAND expansion DECLARATIONS against SCHEMAS."
(unless (ecss--declaration-list-p declarations)
(signal 'ecss-invalid-declaration
(list :shorthand shorthand declarations)))
(cl-loop for (property _value) on declarations by #'cddr
for schema = (progn
(ecss--validate-declaration-property schemas property)
(ecss--schema-for schemas property))
when (and schema (ecss-property-schema-shorthand schema))
do (signal 'ecss-invalid-declaration
(list :nested-shorthand shorthand property))))
(defun ecss--expand-declaration (schemas property value)
"Expand one PROPERTY VALUE declaration using SCHEMAS."
(ecss--validate-declaration-property schemas property)
(let ((schema (ecss--schema-for schemas property)))
(if-let ((expander (and schema
(ecss-property-schema-shorthand schema))))
(pcase-let* ((`(,raw . ,important) (ecss--unwrap-important value))
(expanded (funcall expander raw)))
(ecss--validate-expanded-longhands schemas property expanded)
(ecss--tag-important expanded important))
(list property value))))
;;;###autoload
(defun ecss-expand-declarations (schemas declarations)
"Validate and expand DECLARATIONS through SCHEMAS."
(ecss--schema-set-check schemas)
(unless (ecss--declaration-list-p declarations)
(signal 'ecss-invalid-declaration (list :declarations declarations)))
(cl-loop for (property value) on declarations by #'cddr
append (ecss--expand-declaration schemas property value)))
(defun ecss-stylesheet-create ()
"Create an empty independent stylesheet."
(ecss--make-stylesheet :rules nil :layers nil :source-order 0))
(defun ecss--stylesheet-check (stylesheet)
"Return STYLESHEET or signal when it is invalid."
(unless (ecss-stylesheet-p stylesheet)
(signal 'wrong-type-argument (list 'ecss-stylesheet-p stylesheet)))
stylesheet)
(defun ecss--copy-rule (rule)
"Return a defensive copy of RULE."
(let ((copy (copy-ecss-rule rule)))
(setf (ecss-rule-selector copy) (copy-tree (ecss-rule-selector rule))
(ecss-rule-declarations copy) (copy-tree (ecss-rule-declarations rule))
(ecss-rule-scope copy) (copy-tree (ecss-rule-scope rule)))
copy))
(defun ecss-stylesheet-rules (stylesheet)
"Return defensive rule copies from STYLESHEET."
(ecss--stylesheet-check stylesheet)
(mapcar #'ecss--copy-rule (ecss--stylesheet-rules stylesheet)))
(defun ecss--origin-layers (stylesheet origin)
"Return internal STYLESHEET layer order for ORIGIN."
(cdr (assq origin (ecss--stylesheet-layers stylesheet))))
(defun ecss--set-origin-layers (stylesheet origin layers)
"Set STYLESHEET ORIGIN order to LAYERS."
(if-let ((cell (assq origin (ecss--stylesheet-layers stylesheet))))
(setcdr cell layers)
(setf (ecss--stylesheet-layers stylesheet)
(append (ecss--stylesheet-layers stylesheet)
(list (cons origin layers))))))
(defun ecss-stylesheet-layers (stylesheet &optional origin)
"Return STYLESHEET layers for ORIGIN in declared order.
ORIGIN defaults to `author'."
(ecss--stylesheet-check stylesheet)
(copy-tree
(ecss--origin-layers
stylesheet (ecss--validate-origin (or origin 'author)))))
(defun ecss-stylesheet-clear (stylesheet)
"Remove all rules and layers from STYLESHEET."
(ecss--stylesheet-check stylesheet)
(setf (ecss--stylesheet-rules stylesheet) nil
(ecss--stylesheet-layers stylesheet) nil
(ecss--stylesheet-source-order stylesheet) 0)
stylesheet)
(defun ecss-stylesheet-declare-layers (stylesheet layers &optional origin)
"Append unseen LAYERS to STYLESHEET for ORIGIN and return their order.
ORIGIN defaults to `author'."
(ecss--stylesheet-check stylesheet)
(setq origin (ecss--validate-origin (or origin 'author)))
(unless (and (listp layers) (cl-every (lambda (layer) layer) layers))
(signal 'ecss-invalid-rule (list :layers layers)))
(let ((result (copy-tree (ecss--origin-layers stylesheet origin))))
(dolist (layer layers)
(unless (member layer result)
(setq result (append result (list (copy-tree layer))))))
(ecss--set-origin-layers stylesheet origin result)
(copy-tree result)))
(defun ecss--validate-origin (origin)
"Return ORIGIN when it is a standard cascade origin."
(unless (memq origin ecss--origins)
(signal 'ecss-invalid-rule (list :origin origin)))
origin)
(defun ecss--prospective-layer-rank (stylesheet origin layer)
"Return ORIGIN LAYER rank in STYLESHEET without mutation."
(when layer
(let ((layers (ecss--origin-layers stylesheet origin)))
(or (cl-position layer layers :test #'equal) (length layers)))))
(defun ecss--commit-rule (stylesheet rule layer)
"Commit RULE and optional new LAYER to STYLESHEET."
(let* ((origin (ecss-rule-origin rule))
(layers (ecss--origin-layers stylesheet origin)))
(when (and layer (not (member layer layers)))
(ecss--set-origin-layers
stylesheet origin (append layers (list (copy-tree layer))))))
(setf (ecss--stylesheet-source-order stylesheet)
(ecss-rule-source-order rule)
(ecss--stylesheet-rules stylesheet)
(append (ecss--stylesheet-rules stylesheet) (list rule))))
;;;###autoload
(cl-defun ecss-stylesheet-add-rule
(stylesheet schemas selector declarations
&key (origin 'author) layer scope)
"Add SELECTOR and DECLARATIONS to STYLESHEET using SCHEMAS.
ORIGIN defaults to `author'. LAYER follows declaration order. SCOPE is an
optional selector limiting the rule to a matching subject or ancestor."
(ecss--stylesheet-check stylesheet)
(ecss--schema-set-check schemas)
(let* ((selector (ecss-selector-normalize selector))
(scope (and scope (ecss-selector-normalize scope)))
(origin (ecss--validate-origin origin))
(expanded (ecss-expand-declarations schemas declarations))
(source-order (1+ (ecss--stylesheet-source-order stylesheet)))
(rule (ecss--make-rule
:selector selector :declarations (copy-tree expanded)
:origin origin :layer (copy-tree layer)
:layer-rank (ecss--prospective-layer-rank
stylesheet origin layer)
:scope scope :source-order source-order)))
(ecss--commit-rule stylesheet rule layer)
(ecss--copy-rule rule)))
(defun ecss--scope-distance (scope subject adapter)
"Return SUBJECT distance to matching SCOPE through ADAPTER, or nil."
(if (null scope)
most-positive-fixnum
(cl-loop for current = subject then (ecss--subject-parent current adapter)
for distance from 0 while current
when (ecss-selector-match-p scope current adapter)
return distance)))
(defun ecss--rule-match-facts (rule subject adapter)
"Return RULE match facts for SUBJECT through ADAPTER, or nil."
(when-let ((specificity
(ecss--selector-matched-specificity
(ecss-rule-selector rule) subject adapter)))
(let ((distance (ecss--scope-distance
(ecss-rule-scope rule) subject adapter)))
(when (numberp distance) (cons specificity distance)))))
(defun ecss--candidate-from-rule
(rule property value specificity distance declaration-order)
"Create a candidate from RULE, PROPERTY, and VALUE.
SPECIFICITY, DISTANCE, and DECLARATION-ORDER are the match precedence facts."
(pcase-let ((`(,raw . ,important) (ecss--unwrap-important value)))
(ecss--make-candidate
:property property :value raw :origin (ecss-rule-origin rule)
:important important :inline nil :layer (ecss-rule-layer rule)
:layer-rank (ecss-rule-layer-rank rule) :specificity specificity
:scope-distance distance :source-order (ecss-rule-source-order rule)
:declaration-order declaration-order
:selector (copy-tree (ecss-rule-selector rule)))))
(defun ecss--rule-candidates (rule subject adapter)
"Return candidates from matching RULE for SUBJECT through ADAPTER."
(when-let ((facts (ecss--rule-match-facts rule subject adapter)))
(cl-loop for (property value) on (ecss-rule-declarations rule) by #'cddr
for declaration-order from 0
collect (ecss--candidate-from-rule
rule property value (car facts) (cdr facts)
declaration-order))))
(defun ecss--max-source-order (rules)
"Return greatest source order in RULES."
(cl-loop for rule in rules maximize (ecss-rule-source-order rule) into value
finally return (or value 0)))
(defun ecss--inline-candidates (schemas declarations source-order)
"Return inline candidates from DECLARATIONS using SCHEMAS and SOURCE-ORDER."
(when declarations
(cl-loop for (property value)
on (ecss-expand-declarations schemas declarations) by #'cddr
for declaration-order from 0
collect
(pcase-let ((`(,raw . ,important) (ecss--unwrap-important value)))
(ecss--make-candidate
:property property :value raw :origin 'author
:important important :inline t :layer nil :layer-rank nil
:specificity '(0 0 0)
:scope-distance most-positive-fixnum
:source-order source-order :declaration-order declaration-order
:selector :inline)))))
(defun ecss--collect-candidates
(schemas subject adapter declarations rules)
"Collect candidates for SUBJECT, DECLARATIONS, and RULES.
SCHEMAS validates inline declarations and ADAPTER exposes SUBJECT."
(append
(cl-loop for rule in rules
append (ecss--rule-candidates rule subject adapter))
(ecss--inline-candidates
schemas declarations (1+ (ecss--max-source-order rules)))))
(defun ecss--cascade-level-rank (candidate)
"Return standard CSS origin and importance rank for CANDIDATE."
(let ((origin (ecss--candidate-origin candidate))
(important (ecss--candidate-important candidate)))
(cond ((eq origin 'transition) 7)
((and important (eq origin 'ua)) 6)
((and important (eq origin 'user)) 5)
((and important (eq origin 'author)) 4)
((eq origin 'animation) 3)
((eq origin 'author) 2)
((eq origin 'user) 1)
((eq origin 'ua) 0))))
(defun ecss--candidate-cascade-layer-rank (candidate)
"Return cascade layer rank for CANDIDATE."
(let ((layer (ecss--candidate-layer candidate))
(rank (ecss--candidate-layer-rank candidate))
(important (ecss--candidate-important candidate)))
(cond ((ecss--candidate-inline candidate) 2000000)
((and important (null layer)) -1000000)
((null layer) 1000000)
(important (- (or rank 0)))
(t (or rank 0)))))
(defun ecss--compare-number (left right)
"Compare LEFT and RIGHT, returning 1, -1, or 0."
(cond ((> left right) 1) ((< left right) -1) (t 0)))
(defun ecss--rank-list-comparison (left right)
"Compare numeric rank lists LEFT and RIGHT."
(catch 'comparison
(cl-mapc (lambda (a b)
(let ((value (ecss--compare-number a b)))
(unless (zerop value) (throw 'comparison value))))
left right)
0))
(defun ecss--candidate-primary-ranks (candidate)
"Return primary cascade ranks for CANDIDATE."
(list (ecss--cascade-level-rank candidate)
(ecss--candidate-cascade-layer-rank candidate)))
(defun ecss--candidate-higher-p (left right)
"Return non-nil when candidate LEFT outranks RIGHT."
(let ((rank (ecss--rank-list-comparison
(ecss--candidate-primary-ranks left)
(ecss--candidate-primary-ranks right))))
(cond ((not (zerop rank)) (> rank 0))
((not (equal (ecss--candidate-specificity left)
(ecss--candidate-specificity right)))
(ecss--specificity-greater-p
(ecss--candidate-specificity left)
(ecss--candidate-specificity right)))
((/= (ecss--candidate-scope-distance left)
(ecss--candidate-scope-distance right))
(< (ecss--candidate-scope-distance left)
(ecss--candidate-scope-distance right)))
((/= (ecss--candidate-source-order left)
(ecss--candidate-source-order right))
(> (ecss--candidate-source-order left)
(ecss--candidate-source-order right)))
(t (> (ecss--candidate-declaration-order left)
(ecss--candidate-declaration-order right))))))
(defun ecss--group-candidates (candidates)
"Group and sort CANDIDATES by property."
(let ((table (make-hash-table :test #'eq)))
(dolist (candidate candidates)
(let ((property (ecss--candidate-property candidate)))
(puthash property (cons candidate (gethash property table)) table)))
(maphash (lambda (property values)
(puthash property
(sort values #'ecss--candidate-higher-p) table))
table)
table))
(defun ecss--skip-reverted-origin (candidates winner)
"Remove WINNER origin from CANDIDATES."
(seq-remove
(lambda (candidate)
(eq (ecss--candidate-origin candidate)
(ecss--candidate-origin winner)))
candidates))
(defun ecss--skip-reverted-layer (candidates winner)
"Remove WINNER origin and layer from CANDIDATES."
(seq-remove
(lambda (candidate)
(and (eq (ecss--candidate-origin candidate)
(ecss--candidate-origin winner))
(equal (ecss--candidate-layer candidate)
(ecss--candidate-layer winner))))
candidates))
(defun ecss--resolve-source (value property subject resolver)
"Resolve VALUE for PROPERTY and SUBJECT only through explicit RESOLVER."
(if resolver (funcall resolver value property subject) value))
(defun ecss--parent-values (parent-style)
"Return computed values from PARENT-STYLE."
(cond ((ecss-computed-style-p parent-style)
(ecss--computed-style-values parent-style))
((listp parent-style) parent-style)))
(defun ecss--parent-custom-properties (parent-style)
"Return custom properties from PARENT-STYLE."
(when (ecss-computed-style-p parent-style)
(ecss--computed-style-custom-properties parent-style)))
(defun ecss--parent-property-active-p (parent-style property)
"Return non-nil when PARENT-STYLE actively supplies PROPERTY."
(cond ((ecss-computed-style-p parent-style)
(memq property (ecss--computed-style-active-properties parent-style)))
((listp parent-style) (and (plist-member parent-style property) t))))
(defun ecss--property-default (schema parent-style)
"Return default value and source for SCHEMA using PARENT-STYLE."
(let* ((property (ecss-property-schema-id schema))
(values (ecss--parent-values parent-style)))
(if (and (ecss-property-schema-inherits schema)
(plist-member values property))
(cons (copy-tree (plist-get values property)) 'inherit)
(cons (copy-tree (ecss-property-schema-initial schema)) 'initial))))
(defun ecss--wide-default (wide schema parent-style)
"Resolve non-revert WIDE value for SCHEMA using PARENT-STYLE."
(pcase (ecss--wide-kind wide)
('initial (cons (ecss-property-schema-initial schema) 'initial))
('inherit
(let ((values (ecss--parent-values parent-style))
(property (ecss-property-schema-id schema)))
(if (plist-member values property)
(cons (copy-tree (plist-get values property)) 'inherit)
(cons (copy-tree (ecss-property-schema-initial schema)) 'initial))))
('unset (if (ecss-property-schema-inherits schema)
(ecss--wide-default (ecss-wide-value 'inherit)
schema parent-style)
(cons (copy-tree (ecss-property-schema-initial schema))
'initial)))))
(defun ecss--candidate-provenance (candidate &rest extra)
"Return public provenance for CANDIDATE followed by EXTRA facts."
(append
(if candidate
(list :source 'declaration
:selector (copy-tree (ecss--candidate-selector candidate))
:origin (ecss--candidate-origin candidate)
:important (and (ecss--candidate-important candidate) t)
:inline (and (ecss--candidate-inline candidate) t)
:layer (copy-tree (ecss--candidate-layer candidate))
:specificity (copy-sequence
(ecss--candidate-specificity candidate))
:scope-distance (ecss--candidate-scope-distance candidate)
:source-order (ecss--candidate-source-order candidate)
:declaration-order (ecss--candidate-declaration-order candidate))
'(:source initial :origin ua))
extra))
(defun ecss--select-custom-candidate
(candidates inherited property subject resolver)
"Select custom PROPERTY from CANDIDATES and INHERITED values."
(let ((remaining candidates) selected winner done)
(while (and remaining (not done))
(setq winner (pop remaining))
(let ((value (ecss--resolve-source
(ecss--candidate-value winner) property subject resolver)))
(if (not (ecss--wide-p value))
(setq selected value done t)
(pcase (ecss--wide-kind value)
('revert (setq remaining
(ecss--skip-reverted-origin remaining winner)))
('revert-layer (setq remaining
(ecss--skip-reverted-layer remaining winner)))
((or 'inherit 'unset)
(setq selected (gethash property inherited ecss--absent)
done t))
('initial (setq selected ecss--absent done t))))))
(unless done
(setq selected (gethash property inherited ecss--absent)
winner nil))
(cons selected winner)))
(defun ecss--custom-candidate-properties (candidate-table)
"Return custom property keys from CANDIDATE-TABLE in stable order."
(let (properties)
(maphash (lambda (property _candidates)
(when (ecss--custom-property-p property)
(push property properties)))
candidate-table)
(sort properties
(lambda (left right)
(string< (symbol-name left) (symbol-name right))))))
(defun ecss--custom-raw-table
(candidate-table parent-style subject resolver provenance-p)
"Build raw custom properties from CANDIDATE-TABLE.
PARENT-STYLE supplies inheritance. SUBJECT and RESOLVER handle explicit value
sources. Retain winner facts when PROVENANCE-P is non-nil."
(let ((table (make-hash-table :test #'eq)) provenance)
(cl-loop for (property value) on (ecss--parent-custom-properties parent-style)
by #'cddr
do (puthash property value table)
when provenance-p
do (setq provenance
(plist-put provenance property '(:source inherit))))
(dolist (property (ecss--custom-candidate-properties candidate-table))
(pcase-let ((`(,value . ,winner)
(ecss--select-custom-candidate
(gethash property candidate-table) table property
subject resolver)))
(if (eq value ecss--absent)
(remhash property table)
(puthash property value table))
(when provenance-p
(setq provenance
(plist-put provenance property
(if winner (ecss--candidate-provenance winner)
'(:source inherit)))))))
(list table provenance)))
(defun ecss--record-cycle (stack name diagnostics)
"Record a custom property cycle from STACK through NAME in DIAGNOSTICS."
(let ((path (reverse (cons name stack))))
(unless (member (list :type 'variable-cycle :path path) (car diagnostics))
(push (list :type 'variable-cycle :path path) (car diagnostics)))))
(defun ecss--resolve-var-fallback
(reference raw resolved stack diagnostics)
"Resolve REFERENCE fallback using RAW, RESOLVED, STACK, and DIAGNOSTICS."
(if (ecss--var-ref-fallback-present-p reference)
(ecss--resolve-variable-value
(ecss--var-ref-fallback reference) raw resolved stack diagnostics)
ecss--invalid))
(defun ecss--resolve-custom-property
(name raw resolved stack diagnostics)
"Resolve custom property NAME using RAW, RESOLVED, STACK, and DIAGNOSTICS."
(let ((memo (gethash name resolved ecss--absent)))
(cond ((not (eq memo ecss--absent)) memo)
((memq name stack)
(ecss--record-cycle stack name diagnostics)
ecss--invalid)
(t
(let ((value (gethash name raw ecss--absent)))
(if (eq value ecss--absent)
ecss--invalid
(let ((answer (ecss--resolve-variable-value
value raw resolved (cons name stack)
diagnostics)))
(puthash name answer resolved)
answer)))))))
(defun ecss--resolve-compound-value
(value raw resolved stack diagnostics)
"Resolve custom references recursively inside VALUE.
RAW and RESOLVED are custom-property tables. STACK detects cycles and
DIAGNOSTICS records them."
(cond ((functionp value) value)
((vectorp value)
(let ((items (mapcar
(lambda (item)
(ecss--resolve-variable-value
item raw resolved stack diagnostics))
(append value nil))))
(if (memq ecss--invalid items) ecss--invalid (vconcat items))))
((consp value)
(let ((car-value (ecss--resolve-variable-value
(car value) raw resolved stack diagnostics))
(cdr-value (ecss--resolve-variable-value
(cdr value) raw resolved stack diagnostics)))
(if (or (eq car-value ecss--invalid)
(eq cdr-value ecss--invalid))
ecss--invalid
(cons car-value cdr-value))))
(t value)))
(defun ecss--resolve-variable-value
(value raw resolved stack diagnostics)
"Resolve custom references in VALUE using RAW and RESOLVED tables.
STACK detects cycles and DIAGNOSTICS records them."
(if (not (ecss--var-ref-p value))
(ecss--resolve-compound-value value raw resolved stack diagnostics)
(let ((answer (ecss--resolve-custom-property
(ecss--var-ref-name value) raw resolved stack diagnostics)))
(if (eq answer ecss--invalid)
(ecss--resolve-var-fallback
value raw resolved stack diagnostics)
answer))))
(defun ecss--resolved-custom-properties (raw diagnostics)
"Return resolved custom properties from RAW with DIAGNOSTICS."
(let ((resolved (make-hash-table :test #'eq)) names result)
(maphash (lambda (name _value) (push name names)) raw)
(dolist (name (sort names
(lambda (left right)
(string< (symbol-name left) (symbol-name right)))))
(let ((value (ecss--resolve-custom-property
name raw resolved nil diagnostics)))
(unless (eq value ecss--invalid)
(setq result (plist-put result name value)))))
result))
(defun ecss--custom-value-tables (custom)
"Build RAW and RESOLVED tables from computed CUSTOM properties."
(let ((raw (make-hash-table :test #'eq))
(resolved (make-hash-table :test #'eq)))
(cl-loop for (name value) on custom by #'cddr
do (puthash name value raw)
do (puthash name value resolved))
(cons raw resolved)))
(defun ecss--resolve-property-value
(value schema parent-style custom diagnostics)
"Resolve VALUE for SCHEMA using PARENT-STYLE, CUSTOM, and DIAGNOSTICS."
(cond ((and (ecss--wide-p value)
(memq (ecss--wide-kind value) '(initial inherit unset)))
(ecss--wide-default value schema parent-style))
(t
(pcase-let ((`(,raw . ,resolved)
(ecss--custom-value-tables custom)))
(cons (ecss--resolve-variable-value
value raw resolved nil diagnostics)
'declaration)))))
(defun ecss--normalize-property-value (schema value)
"Normalize and validate VALUE for SCHEMA, or return invalid sentinel."
(if (eq value ecss--invalid)
value
(let ((normalized
(funcall (ecss-property-schema-normalizer schema) value)))
(if (funcall (ecss-property-schema-validator schema) normalized)
normalized
ecss--invalid))))
(defun ecss--compute-candidate-value
(candidate schema parent-style custom subject resolver diagnostics)
"Resolve CANDIDATE for SCHEMA and computation context.
PARENT-STYLE and CUSTOM supply inherited values. SUBJECT and RESOLVER handle
explicit sources, and DIAGNOSTICS records variable failures."
(let* ((property (ecss-property-schema-id schema))
(source (ecss--resolve-source
(ecss--candidate-value candidate)
property subject resolver))
(resolved (ecss--resolve-property-value
source schema parent-style custom diagnostics)))
(cons (if (eq (cdr resolved) 'declaration)
(ecss--normalize-property-value schema (car resolved))
(copy-tree (car resolved)))
(cdr resolved))))
(defun ecss--fallback-value (schema parent-style)
"Return the computed default for SCHEMA using PARENT-STYLE."
(pcase-let ((`(,value . ,source)
(ecss--property-default schema parent-style)))
(cons value source)))
(defun ecss--resolve-property-candidates
(schema candidates parent-style custom subject resolver diagnostics)
"Resolve SCHEMA from ordered CANDIDATES.
PARENT-STYLE and CUSTOM supply inherited values. SUBJECT and RESOLVER handle
explicit sources, and DIAGNOSTICS records variable failures."
(let ((remaining candidates) winner resolved)
(while (and remaining (null winner))
(let* ((candidate (pop remaining))
(raw (ecss--resolve-source
(ecss--candidate-value candidate)
(ecss-property-schema-id schema) subject resolver)))
(cond ((and (ecss--wide-p raw) (eq (ecss--wide-kind raw) 'revert))
(setq remaining (ecss--skip-reverted-origin
remaining candidate)))
((and (ecss--wide-p raw)
(eq (ecss--wide-kind raw) 'revert-layer))
(setq remaining (ecss--skip-reverted-layer
remaining candidate)))
(t
(setq winner candidate
resolved
(ecss--compute-candidate-value
candidate schema parent-style custom subject
(lambda (_value _property _subject) raw) diagnostics))))))
(let* ((invalid (and winner (eq (car resolved) ecss--invalid)))
(final (if (or (null winner) invalid)
(ecss--fallback-value schema parent-style)
resolved)))
(list (car final) winner invalid (cdr final)))))
(defun ecss--property-provenance (winner invalid source)
"Return provenance from WINNER, INVALID state, and fallback SOURCE."
(if winner
(ecss--candidate-provenance
winner :valid (not invalid)
:value-source source
:fallback (and invalid source))
(list :source source :origin (if (eq source 'initial) 'ua 'inherit))))
(defun ecss--compute-property-values
(schemas table parent-style custom subject resolver diagnostics provenance-p)
"Compute SCHEMAS property values from TABLE and context.
PARENT-STYLE and CUSTOM supply inherited values. SUBJECT and RESOLVER handle
explicit sources. DIAGNOSTICS records failures; PROVENANCE-P retains facts."
(let (values active provenance)
(dolist (property (ecss--schema-set-order schemas))
(let ((schema (ecss--schema-for schemas property)))
(unless (ecss-property-schema-shorthand schema)
(pcase-let ((`(,value ,winner ,invalid ,source)
(ecss--resolve-property-candidates
schema (gethash property table) parent-style custom
subject resolver diagnostics)))
(setq values (plist-put values property value))
(when (or (and winner (not invalid))
(and (ecss-property-schema-inherits schema)
(ecss--parent-property-active-p parent-style property)))
(push property active))
(when provenance-p
(setq provenance
(plist-put provenance property
(ecss--property-provenance
winner invalid source))))))))
(list values (nreverse active) provenance)))
(defun ecss--validate-rule-declarations (schemas rule)
"Validate canonical declarations in RULE against SCHEMAS."
(unless (ecss--declaration-list-p (ecss-rule-declarations rule))
(signal 'ecss-invalid-rule (list :declarations rule)))
(cl-loop for (property _value) on (ecss-rule-declarations rule) by #'cddr
do (ecss--validate-declaration-property schemas property)
for schema = (ecss--schema-for schemas property)
when (and schema (ecss-property-schema-shorthand schema))
do (signal 'ecss-invalid-rule (list :shorthand-snapshot property))))
(defun ecss--validate-rule-snapshot (schemas rule)
"Return RULE after validating it against SCHEMAS."
(unless (ecss-rule-p rule)
(signal 'ecss-invalid-rule (list :rule rule)))
(ecss--validate-selector (ecss-rule-selector rule))
(when (ecss-rule-scope rule)
(ecss--validate-selector (ecss-rule-scope rule)))
(ecss--validate-origin (ecss-rule-origin rule))
(unless (natnump (ecss-rule-source-order rule))
(signal 'ecss-invalid-rule (list :source-order rule)))
(ecss--validate-rule-declarations schemas rule)
rule)
(defun ecss--active-rules (schemas stylesheet rules)
"Return active rules for SCHEMAS from STYLESHEET or RULES."
(when (and stylesheet rules)
(signal 'ecss-invalid-rule (list :stylesheet-and-rules)))
(let ((active (cond (stylesheet
(ecss--stylesheet-check stylesheet)
(ecss--stylesheet-rules stylesheet))
(rules rules))))
(when rules
(mapc (lambda (rule) (ecss--validate-rule-snapshot schemas rule)) active))
active))
;;;###autoload
(cl-defun ecss-compute-style
(schemas subject &key stylesheet rules declarations parent-style
adapter provenance value-resolver)
"Compute a deterministic style for SUBJECT using SCHEMAS.
STYLESHEET or RULES supplies validated rules. DECLARATIONS are inline.
PARENT-STYLE may be another computed style or a values plist. ADAPTER exposes
caller-owned subjects. PROVENANCE retains winner facts. VALUE-RESOLVER, when
non-nil, is the only function allowed to evaluate caller-owned value sources;
it receives VALUE, PROPERTY, and SUBJECT."
(ecss--schema-set-check schemas)
(let ((adapter (or adapter ecss-default-subject-adapter)))
(unless (ecss-subject-adapter-p adapter)
(signal 'wrong-type-argument (list 'ecss-subject-adapter-p adapter)))
(let* ((rules (ecss--active-rules schemas stylesheet rules))
(table (ecss--group-candidates
(ecss--collect-candidates
schemas subject adapter declarations rules)))
(diagnostics (list nil))
(raw-facts (ecss--custom-raw-table
table parent-style subject value-resolver provenance))
(custom (ecss--resolved-custom-properties
(car raw-facts) diagnostics)))
(pcase-let ((`(,values ,active ,property-facts)
(ecss--compute-property-values
schemas table parent-style custom subject value-resolver
diagnostics provenance)))
(ecss--make-computed-style
:values values :custom-properties custom :active-properties active
:provenance (and provenance
(append (cadr raw-facts) property-facts))
:diagnostics (nreverse (car diagnostics)))))))
(defun ecss--computed-style-check (style)
"Return STYLE or signal when it is not a computed style."
(unless (ecss-computed-style-p style)
(signal 'wrong-type-argument (list 'ecss-computed-style-p style)))
style)
(defun ecss-computed-style-values (style)
"Return a defensive values plist from computed STYLE."
(ecss--computed-style-check style)
(copy-tree (ecss--computed-style-values style)))
(defun ecss-computed-style-custom-properties (style)
"Return a defensive custom property plist from computed STYLE."
(ecss--computed-style-check style)
(copy-tree (ecss--computed-style-custom-properties style)))
(defun ecss-computed-style-active-properties (style)
"Return actively supplied property identifiers from computed STYLE."
(ecss--computed-style-check style)
(copy-sequence (ecss--computed-style-active-properties style)))
(defun ecss-computed-style-provenance (style)
"Return defensive winner provenance from computed STYLE."
(ecss--computed-style-check style)
(copy-tree (ecss--computed-style-provenance style)))
(defun ecss-computed-style-diagnostics (style)
"Return defensive diagnostics from computed STYLE."
(ecss--computed-style-check style)
(copy-tree (ecss--computed-style-diagnostics style)))
(defun ecss-computed-style-value (style property &optional fallback)
"Return PROPERTY from computed STYLE, or FALLBACK when absent."
(let ((values (ecss--computed-style-values
(ecss--computed-style-check style))))
(if (plist-member values property) (plist-get values property) fallback)))
(defun ecss-computed-style-present-p (style property)
"Return non-nil when PROPERTY is actively supplied in computed STYLE."
(memq property
(ecss--computed-style-active-properties
(ecss--computed-style-check style))))
(provide 'ecss-cascade)
;;; ecss-cascade.el ends here

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;;; ecss-selector.el --- Generic CSS selector model -*- lexical-binding: t; -*-
;; Copyright (C) 2026 Geekinney
;; SPDX-License-Identifier: GPL-3.0-or-later
;;; Commentary:
;; This module parses, validates, matches, and scores CSS-like selectors over
;; either `ecss-subject' values or caller-owned values exposed through an
;; `ecss-subject-adapter'. It has no dependency on buffers or rendering code.
;;; Code:
(require 'cl-lib)
(require 'seq)
(require 'subr-x)
(define-error 'ecss-error "ECSS error")
(define-error 'ecss-invalid-selector "Invalid ECSS selector" 'ecss-error)
(define-error 'ecss-invalid-subject-adapter
"Invalid ECSS subject adapter" 'ecss-error)
(cl-defstruct (ecss-subject (:constructor ecss--make-subject))
"Generic selector subject independent of a rendering consumer."
type id classes attributes states parent children)
(cl-defstruct (ecss-subject-adapter
(:constructor ecss--make-subject-adapter))
"Functions exposing caller-owned subjects to the selector engine."
type id classes attributes states parent children)
(cl-defstruct (ecss--selector-parser
(:constructor ecss--make-selector-parser))
input position length)
(defconst ecss--attribute-operators '("=" "~=" "|=" "^=" "$=" "*=")
"Supported attribute selector operators.")
(defconst ecss--selector-delimiters
'(?\s ?\t ?\n ?\r ?\f ?. ?# ?\[ ?\] ?: ?, ?> ?+ ?~ ?\( ?\) ?*
?= ?| ?^ ?$ ?' ?\" ?/)
"Characters that terminate an unescaped selector identifier.")
(defvar ecss--selector-anchor nil
"Dynamically bound subject anchoring a relative selector.")
(defun ecss--adapter-callback-p (value)
"Return non-nil when VALUE is a valid adapter callback."
(functionp value))
(cl-defun ecss-subject-adapter-create
(&key type id classes attributes states parent children)
"Create a subject adapter from the supplied callbacks.
TYPE, ID, CLASSES, ATTRIBUTES, STATES, PARENT, and CHILDREN each accept one
caller-owned subject and return the named field."
(let ((callbacks (list type id classes attributes states parent children)))
(unless (cl-every #'ecss--adapter-callback-p callbacks)
(signal 'ecss-invalid-subject-adapter callbacks)))
(ecss--make-subject-adapter
:type type :id id :classes classes :attributes attributes
:states states :parent parent :children children))
(defconst ecss-default-subject-adapter
(ecss--make-subject-adapter
:type #'ecss-subject-type
:id #'ecss-subject-id
:classes #'ecss-subject-classes
:attributes #'ecss-subject-attributes
:states #'ecss-subject-states
:parent #'ecss-subject-parent
:children #'ecss-subject-children)
"Adapter for built-in `ecss-subject' values.")
(cl-defun ecss-subject-create
(&key type id classes attributes states parent children)
"Create a generic subject.
TYPE and ID identify it. CLASSES and STATES are token lists. ATTRIBUTES is
an alist. PARENT and CHILDREN establish its initial tree position."
(when (and parent (not (ecss-subject-p parent)))
(signal 'wrong-type-argument (list 'ecss-subject-p parent)))
(let ((subject (ecss--make-subject
:type type :id id :classes (copy-sequence classes)
:attributes (copy-tree attributes)
:states (copy-sequence states))))
(ecss-subject-set-children subject children)
(when parent
(ecss-subject-set-children
parent (append (ecss-subject-children parent) (list subject))))
subject))
(defun ecss-subject-set-children (subject children)
"Replace SUBJECT's CHILDREN and maintain their parent links."
(unless (ecss-subject-p subject)
(signal 'wrong-type-argument (list 'ecss-subject-p subject)))
(unless (cl-every #'ecss-subject-p children)
(signal 'wrong-type-argument (list 'ecss-subject-p children)))
(dolist (old-child (ecss-subject-children subject))
(when (eq (ecss-subject-parent old-child) subject)
(setf (ecss-subject-parent old-child) nil)))
(setf (ecss-subject-children subject) (copy-sequence children))
(dolist (child children)
(when-let ((old-parent (ecss-subject-parent child)))
(unless (eq old-parent subject)
(setf (ecss-subject-children old-parent)
(delq child (ecss-subject-children old-parent)))))
(setf (ecss-subject-parent child) subject))
subject)
(defun ecss--adapter-call (adapter field subject)
"Call ADAPTER callback FIELD for SUBJECT."
(funcall
(pcase field
('type (ecss-subject-adapter-type adapter))
('id (ecss-subject-adapter-id adapter))
('classes (ecss-subject-adapter-classes adapter))
('attributes (ecss-subject-adapter-attributes adapter))
('states (ecss-subject-adapter-states adapter))
('parent (ecss-subject-adapter-parent adapter))
('children (ecss-subject-adapter-children adapter)))
subject))
(defun ecss--subject-parent (subject adapter)
"Return SUBJECT's parent through ADAPTER."
(ecss--adapter-call adapter 'parent subject))
(defun ecss--subject-children (subject adapter)
"Return SUBJECT's children through ADAPTER."
(ecss--adapter-call adapter 'children subject))
(defun ecss--parser-end-p (parser)
"Return non-nil when PARSER reached the input end."
(>= (ecss--selector-parser-position parser)
(ecss--selector-parser-length parser)))
(defun ecss--parser-peek (parser &optional offset)
"Return PARSER character at optional OFFSET without consuming it."
(let ((position (+ (ecss--selector-parser-position parser) (or offset 0))))
(when (< position (ecss--selector-parser-length parser))
(aref (ecss--selector-parser-input parser) position))))
(defun ecss--parser-take (parser)
"Consume and return PARSER's current character."
(prog1 (ecss--parser-peek parser)
(cl-incf (ecss--selector-parser-position parser))))
(defun ecss--selector-space-p (character)
"Return non-nil when CHARACTER is CSS whitespace."
(memq character '(?\s ?\t ?\n ?\r ?\f)))
(defun ecss--parser-skip-comment (parser)
"Skip one comment at PARSER and return non-nil when found."
(when (and (eq (ecss--parser-peek parser) ?/)
(eq (ecss--parser-peek parser 1) ?*))
(cl-incf (ecss--selector-parser-position parser) 2)
(let ((end (string-match "\\*/" (ecss--selector-parser-input parser)
(ecss--selector-parser-position parser))))
(unless end
(signal 'ecss-invalid-selector (list :unclosed-comment)))
(setf (ecss--selector-parser-position parser) (+ end 2)))
t))
(defun ecss--parser-skip-space (parser)
"Skip whitespace and comments at PARSER and report actual whitespace."
(let (space progress)
(while
(progn
(setq progress nil)
(while (ecss--selector-space-p (ecss--parser-peek parser))
(setq progress t space t)
(ecss--parser-take parser))
(when (ecss--parser-skip-comment parser)
(setq progress t))
progress))
space))
(defun ecss--parser-skip-comments (parser)
"Skip consecutive comments at PARSER without implying a combinator."
(while (ecss--parser-skip-comment parser)))
(defun ecss--identifier-character-p (character)
"Return non-nil when CHARACTER may occur unescaped in an identifier."
(and character (not (memq character ecss--selector-delimiters))))
(defun ecss--parser-read-escape (parser)
"Read one escaped character from PARSER."
(ecss--parser-take parser)
(when (ecss--parser-end-p parser)
(signal 'ecss-invalid-selector (list :trailing-escape)))
(ecss--parser-take parser))
(defun ecss--parser-read-identifier (parser)
"Read and return one identifier from PARSER."
(let (characters)
(while (or (ecss--identifier-character-p (ecss--parser-peek parser))
(eq (ecss--parser-peek parser) ?\\))
(push (if (eq (ecss--parser-peek parser) ?\\)
(ecss--parser-read-escape parser)
(ecss--parser-take parser))
characters))
(unless characters
(signal 'ecss-invalid-selector
(list :expected-identifier
(ecss--selector-parser-position parser))))
(apply #'string (nreverse characters))))
(defun ecss--parser-expect (parser character)
"Consume CHARACTER from PARSER or signal an invalid-selector error."
(unless (eq (ecss--parser-peek parser) character)
(signal 'ecss-invalid-selector
(list :expected character
:position (ecss--selector-parser-position parser))))
(ecss--parser-take parser))
(defun ecss--parser-read-string (parser)
"Read one quoted string from PARSER."
(let ((quote (ecss--parser-take parser)) characters done)
(while (and (not done) (not (ecss--parser-end-p parser)))
(let ((character (ecss--parser-take parser)))
(cond ((eq character quote) (setq done t))
((eq character ?\\)
(when (ecss--parser-end-p parser)
(signal 'ecss-invalid-selector (list :trailing-escape)))
(push (ecss--parser-take parser) characters))
(t (push character characters)))))
(unless done
(signal 'ecss-invalid-selector (list :unclosed-string)))
(apply #'string (nreverse characters))))
(defun ecss--parser-read-attribute-value (parser)
"Read one attribute value from PARSER."
(if (memq (ecss--parser-peek parser) '(?' ?\"))
(ecss--parser-read-string parser)
(ecss--parser-read-identifier parser)))
(defun ecss--parser-attribute-operator (parser)
"Read an optional attribute operator from PARSER."
(let ((first (ecss--parser-peek parser))
(second (ecss--parser-peek parser 1)))
(cond ((eq first ?=) (ecss--parser-take parser) "=")
((and (memq first '(?~ ?| ?^ ?$ ?*)) (eq second ?=))
(cl-incf (ecss--selector-parser-position parser) 2)
(string first second)))))
(defun ecss--parser-read-attribute (parser)
"Read one attribute selector from PARSER."
(ecss--parser-expect parser ?\[)
(ecss--parser-skip-space parser)
(let ((name (ecss--parser-read-identifier parser)) operator value flag)
(ecss--parser-skip-space parser)
(setq operator (ecss--parser-attribute-operator parser))
(when operator
(ecss--parser-skip-space parser)
(setq value (ecss--parser-read-attribute-value parser))
(ecss--parser-skip-space parser)
(when (and (ecss--identifier-character-p (ecss--parser-peek parser))
(not (eq (ecss--parser-peek parser) ?\])))
(setq flag (downcase (ecss--parser-read-identifier parser)))
(unless (member flag '("i" "s"))
(signal 'ecss-invalid-selector (list :attribute-flag flag)))
(ecss--parser-skip-space parser)))
(ecss--parser-expect parser ?\])
(if operator
(list :attr name operator value flag)
(list :attr name))))
(defun ecss--parser-read-raw-function (parser)
"Read an unknown pseudo function argument from PARSER."
(let ((start (ecss--selector-parser-position parser))
(depth 1) quote escaped)
(while (and (> depth 0) (not (ecss--parser-end-p parser)))
(let ((character (ecss--parser-take parser)))
(cond (escaped (setq escaped nil))
((eq character ?\\) (setq escaped t))
(quote (when (eq character quote) (setq quote nil)))
((memq character '(?' ?\")) (setq quote character))
((eq character ?\() (cl-incf depth))
((eq character ?\)) (cl-decf depth)))))
(unless (zerop depth)
(signal 'ecss-invalid-selector (list :unclosed-pseudo)))
(string-trim
(substring (ecss--selector-parser-input parser) start
(1- (ecss--selector-parser-position parser))))))
(defun ecss--anchor-relative-selector (selector kind)
"Anchor relative SELECTOR with leading combinator KIND."
(if (memq (car-safe selector) '(:descendant :child :adjacent :sibling))
(list (car selector)
(ecss--anchor-relative-selector (nth 1 selector) kind)
(nth 2 selector))
(list kind '(:anchor) selector)))
(defun ecss--parser-read-relative-list (parser)
"Read a relative selector list from PARSER through its closing parenthesis."
(ecss--parser-skip-space parser)
(let (selectors done)
(while (not done)
(let ((kind (or (ecss--combinator-kind (ecss--parser-peek parser))
:descendant)))
(unless (eq kind :descendant)
(ecss--parser-take parser)
(ecss--parser-skip-space parser))
(push (ecss--anchor-relative-selector
(ecss--parser-read-complex parser ?\)) kind)
selectors))
(ecss--parser-skip-space parser)
(cond ((eq (ecss--parser-peek parser) ?,)
(ecss--parser-take parser)
(ecss--parser-skip-space parser))
((eq (ecss--parser-peek parser) ?\))
(ecss--parser-take parser)
(setq done t))
(t (signal 'ecss-invalid-selector (list :unterminated-relative)))))
(nreverse selectors)))
(defun ecss--parser-read-pseudo (parser)
"Read one pseudo-class selector from PARSER."
(ecss--parser-expect parser ?:)
(when (eq (ecss--parser-peek parser) ?:)
(signal 'ecss-invalid-selector (list :pseudo-elements-unsupported)))
(let ((name (downcase (ecss--parser-read-identifier parser))))
(if (not (eq (ecss--parser-peek parser) ?\())
(list :state name)
(ecss--parser-take parser)
(cond
((equal name "has")
(cons :has (ecss--parser-read-relative-list parser)))
((member name '("is" "where" "not"))
(let ((selectors (ecss--parser-read-selector-list parser ?\))))
(cons (intern (concat ":" name))
(if (eq (car-safe selectors) :list)
(cdr selectors)
(list selectors)))))
(t (list :state
(list name (ecss--parser-read-raw-function parser))))))))
(defun ecss--compound-item-p (character)
"Return non-nil when CHARACTER can start a compound selector item."
(memq character '(?# ?. ?\[ ?:)))
(defun ecss--parser-read-compound (parser)
"Read one compound selector from PARSER."
(let (items)
(cond ((eq (ecss--parser-peek parser) ?*)
(ecss--parser-take parser)
(push '(:universal) items))
((ecss--identifier-character-p (ecss--parser-peek parser))
(push (list :type (ecss--parser-read-identifier parser)) items)))
(ecss--parser-skip-comments parser)
(while (ecss--compound-item-p (ecss--parser-peek parser))
(pcase (ecss--parser-peek parser)
(?# (ecss--parser-take parser)
(push (list :id (ecss--parser-read-identifier parser)) items))
(?. (ecss--parser-take parser)
(push (list :class (ecss--parser-read-identifier parser)) items))
(?\[ (push (ecss--parser-read-attribute parser) items))
(?: (push (ecss--parser-read-pseudo parser) items)))
(ecss--parser-skip-comments parser))
(setq items (nreverse items))
(cond ((null items)
(signal 'ecss-invalid-selector
(list :expected-compound
(ecss--selector-parser-position parser))))
((null (cdr items)) (car items))
(t (cons :and items)))))
(defun ecss--combinator-kind (character)
"Return AST combinator kind for CHARACTER."
(pcase character (?> :child) (?+ :adjacent) (?~ :sibling)))
(defun ecss--selector-list-end-p (parser terminator)
"Return non-nil when PARSER is at a list boundary TERMINATOR."
(or (ecss--parser-end-p parser)
(eq (ecss--parser-peek parser) ?,)
(and terminator (eq (ecss--parser-peek parser) terminator))))
(defun ecss--parser-read-complex (parser terminator)
"Read one complex selector from PARSER up to TERMINATOR."
(let ((left (ecss--parser-read-compound parser)) done)
(while (not done)
(let ((space (ecss--parser-skip-space parser)) kind)
(cond ((ecss--selector-list-end-p parser terminator)
(setq done t))
((setq kind (ecss--combinator-kind (ecss--parser-peek parser)))
(ecss--parser-take parser)
(ecss--parser-skip-space parser)
(setq left (list kind left
(ecss--parser-read-compound parser))))
(space
(setq left (list :descendant left
(ecss--parser-read-compound parser))))
(t
(signal 'ecss-invalid-selector
(list :unexpected-character
(ecss--parser-peek parser)))))))
left))
(defun ecss--parser-read-selector-list (parser &optional terminator)
"Read a selector list from PARSER up to optional TERMINATOR."
(ecss--parser-skip-space parser)
(let (selectors done)
(while (not done)
(push (ecss--parser-read-complex parser terminator) selectors)
(ecss--parser-skip-space parser)
(cond ((eq (ecss--parser-peek parser) ?,)
(ecss--parser-take parser)
(ecss--parser-skip-space parser))
((and terminator (eq (ecss--parser-peek parser) terminator))
(ecss--parser-take parser)
(setq done t))
((and (null terminator) (ecss--parser-end-p parser))
(setq done t))
(t (signal 'ecss-invalid-selector (list :unterminated-list)))))
(setq selectors (nreverse selectors))
(if (null (cdr selectors)) (car selectors) (cons :list selectors))))
;;;###autoload
(defun ecss-selector-parse (selector)
"Parse CSS-like SELECTOR text into a structured selector AST."
(unless (and (stringp selector) (not (string-empty-p selector)))
(signal 'ecss-invalid-selector (list selector)))
(let ((parser (ecss--make-selector-parser
:input selector :position 0 :length (length selector))))
(ecss--parser-read-selector-list parser)))
(defun ecss--selector-form-p (selector kind arity)
"Return non-nil when SELECTOR is KIND with ARITY arguments."
(and (consp selector) (eq (car selector) kind)
(= (length (cdr selector)) arity)))
(defun ecss--selector-list-valid-p (selectors)
"Return non-nil when SELECTORS is a nonempty valid selector list."
(and selectors (cl-every #'ecss-selector-valid-p selectors)))
(defun ecss--attribute-selector-valid-p (selector)
"Return non-nil when attribute SELECTOR is valid."
(or (ecss--selector-form-p selector :attr 1)
(and (ecss--selector-form-p selector :attr 4)
(member (nth 2 selector) ecss--attribute-operators)
(or (null (nth 4 selector))
(member (nth 4 selector) '("i" "s"))))))
(defun ecss-selector-valid-p (selector)
"Return non-nil when structured SELECTOR is valid."
(pcase (car-safe selector)
((or :type :id :class :state)
(and (ecss--selector-form-p selector (car selector) 1)
(nth 1 selector)))
(:attr (ecss--attribute-selector-valid-p selector))
((or :and :list :is :where :not :has)
(ecss--selector-list-valid-p (cdr selector)))
((or :descendant :child :adjacent :sibling)
(and (ecss--selector-form-p selector (car selector) 2)
(ecss--selector-list-valid-p (cdr selector))))
((or :universal :anchor) (null (cdr selector)))
(_ nil)))
(defun ecss--validate-selector (selector)
"Return SELECTOR or signal when it is invalid."
(unless (ecss-selector-valid-p selector)
(signal 'ecss-invalid-selector (list selector)))
selector)
;;;###autoload
(defun ecss-selector-normalize (selector)
"Return a validated defensive AST for string or structured SELECTOR."
(let ((ast (if (stringp selector) (ecss-selector-parse selector) selector)))
(copy-tree (ecss--validate-selector ast))))
(defun ecss--subject-attribute-cell (subject adapter name)
"Return SUBJECT attribute NAME through ADAPTER."
(assoc name (ecss--adapter-call adapter 'attributes subject)))
(defun ecss--subject-previous-siblings (subject adapter)
"Return SUBJECT's preceding siblings through ADAPTER."
(when-let ((parent (ecss--subject-parent subject adapter)))
(let ((siblings (ecss--subject-children parent adapter)) result)
(while (and siblings (not (eq (car siblings) subject)))
(push (pop siblings) result))
(nreverse result))))
(defun ecss--attribute-token-member-p (needle value insensitive)
"Return whether NEEDLE occurs in whitespace-separated VALUE.
Compare without case when INSENSITIVE is non-nil."
(let ((tokens (split-string (format "%s" value) "[ \t\n\r\f]+" t)))
(cl-some (lambda (token)
(if insensitive
(string-equal (downcase needle) (downcase token))
(string-equal needle token)))
tokens)))
(defun ecss--attribute-string-match-p (operator expected actual insensitive)
"Match EXPECTED against ACTUAL with OPERATOR and case mode INSENSITIVE."
(let ((expected (format "%s" expected)) (actual (format "%s" actual)))
(when insensitive
(setq expected (downcase expected) actual (downcase actual)))
(cond ((equal operator "=") (string-equal actual expected))
((equal operator "~=")
(ecss--attribute-token-member-p expected actual insensitive))
((equal operator "|=")
(or (string-equal actual expected)
(string-prefix-p (concat expected "-") actual)))
((equal operator "^=") (string-prefix-p expected actual))
((equal operator "$=") (string-suffix-p expected actual))
((equal operator "*=")
(string-match-p (regexp-quote expected) actual)))))
(defun ecss--selector-match-attribute (selector subject adapter)
"Return whether attribute SELECTOR matches SUBJECT through ADAPTER."
(let ((cell (ecss--subject-attribute-cell subject adapter (nth 1 selector))))
(and cell
(or (= (length selector) 2)
(ecss--attribute-string-match-p
(nth 2 selector) (nth 3 selector) (cdr cell)
(equal (nth 4 selector) "i"))))))
(defun ecss--selector-match-descendant (selector subject adapter)
"Return whether descendant SELECTOR matches SUBJECT through ADAPTER."
(and (ecss-selector-match-p (nth 2 selector) subject adapter)
(cl-loop for parent = (ecss--subject-parent subject adapter)
then (ecss--subject-parent parent adapter)
while parent
thereis (ecss-selector-match-p
(nth 1 selector) parent adapter))))
(defun ecss--selector-match-adjacent (selector subject adapter)
"Return whether adjacent SELECTOR matches SUBJECT through ADAPTER."
(let ((siblings (ecss--subject-previous-siblings subject adapter)))
(and siblings
(ecss-selector-match-p (nth 1 selector) (car (last siblings)) adapter)
(ecss-selector-match-p (nth 2 selector) subject adapter))))
(defun ecss--selector-match-sibling (selector subject adapter)
"Return whether sibling SELECTOR matches SUBJECT through ADAPTER."
(and (ecss-selector-match-p (nth 2 selector) subject adapter)
(cl-some (lambda (sibling)
(ecss-selector-match-p (nth 1 selector) sibling adapter))
(ecss--subject-previous-siblings subject adapter))))
(defun ecss--subject-descendants (subject adapter)
"Return all descendants of SUBJECT through ADAPTER."
(cl-loop for child in (ecss--subject-children subject adapter)
append (cons child (ecss--subject-descendants child adapter))))
(defun ecss--subject-following-siblings (subject adapter)
"Return siblings following SUBJECT through ADAPTER."
(when-let ((parent (ecss--subject-parent subject adapter)))
(let ((siblings (ecss--subject-children parent adapter)))
(while (and siblings (not (eq (pop siblings) subject))))
siblings)))
(defun ecss--relative-candidates (subject adapter)
"Return possible relative-selector targets from SUBJECT through ADAPTER."
(append
(ecss--subject-descendants subject adapter)
(cl-loop for sibling in (ecss--subject-following-siblings subject adapter)
append (cons sibling (ecss--subject-descendants sibling adapter)))))
(defun ecss--selector-match-has (selectors subject adapter)
"Return whether SUBJECT has a relative target matching SELECTORS."
(let ((ecss--selector-anchor subject))
(cl-some (lambda (candidate)
(cl-some (lambda (selector)
(ecss-selector-match-p selector candidate adapter))
selectors))
(ecss--relative-candidates subject adapter))))
(defun ecss--selector-match-valid (selector subject adapter)
"Match validated SELECTOR against SUBJECT through ADAPTER."
(pcase (car selector)
(:universal t)
(:anchor (eq subject ecss--selector-anchor))
(:type (equal (nth 1 selector) (ecss--adapter-call adapter 'type subject)))
(:id (equal (nth 1 selector) (ecss--adapter-call adapter 'id subject)))
(:class (member (nth 1 selector)
(ecss--adapter-call adapter 'classes subject)))
(:state (member (nth 1 selector)
(ecss--adapter-call adapter 'states subject)))
(:attr (ecss--selector-match-attribute selector subject adapter))
(:and (cl-every (lambda (item)
(ecss-selector-match-p item subject adapter))
(cdr selector)))
((or :list :is :where)
(cl-some (lambda (item)
(ecss-selector-match-p item subject adapter))
(cdr selector)))
(:not (not (cl-some (lambda (item)
(ecss-selector-match-p item subject adapter))
(cdr selector))))
(:has (ecss--selector-match-has (cdr selector) subject adapter))
(:descendant (ecss--selector-match-descendant selector subject adapter))
(:child (and (ecss-selector-match-p (nth 2 selector) subject adapter)
(when-let ((parent (ecss--subject-parent subject adapter)))
(ecss-selector-match-p (nth 1 selector) parent adapter))))
(:adjacent (ecss--selector-match-adjacent selector subject adapter))
(:sibling (ecss--selector-match-sibling selector subject adapter))))
;;;###autoload
(defun ecss-selector-match-p
(selector subject &optional adapter)
"Return non-nil when SELECTOR matches SUBJECT through optional ADAPTER."
(let ((adapter (or adapter ecss-default-subject-adapter))
(selector (if (stringp selector)
(ecss-selector-parse selector)
selector)))
(unless (ecss-subject-adapter-p adapter)
(signal 'wrong-type-argument (list 'ecss-subject-adapter-p adapter)))
(ecss--validate-selector selector)
(ecss--selector-match-valid selector subject adapter)))
(defun ecss--specificity-add (left right)
"Add specificity triples LEFT and RIGHT."
(cl-mapcar #'+ left right))
(defun ecss--specificity-greater-p (left right)
"Return non-nil when specificity LEFT is greater than RIGHT."
(catch 'result
(cl-mapc (lambda (a b)
(cond ((> a b) (throw 'result t))
((< a b) (throw 'result nil))))
left right)
nil))
(defun ecss--specificity-max (values)
"Return the lexicographically greatest specificity in VALUES."
(cl-reduce (lambda (left right)
(if (ecss--specificity-greater-p left right) left right))
values :initial-value '(0 0 0)))
(defun ecss--specificity-list-sum (selectors)
"Return the combined specificity of SELECTORS."
(cl-reduce #'ecss--specificity-add selectors
:key #'ecss-selector-specificity
:initial-value '(0 0 0)))
;;;###autoload
(defun ecss-selector-specificity (selector)
"Return SELECTOR specificity as an (ID CLASS TYPE) list."
(setq selector (if (stringp selector)
(ecss-selector-parse selector)
selector))
(ecss--validate-selector selector)
(pcase (car selector)
(:id '(1 0 0))
((or :class :attr :state) '(0 1 0))
(:type '(0 0 1))
((or :universal :anchor :where) '(0 0 0))
(:and (ecss--specificity-list-sum (cdr selector)))
((or :list :is :not :has)
(ecss--specificity-max
(mapcar #'ecss-selector-specificity (cdr selector))))
((or :descendant :child :adjacent :sibling)
(ecss--specificity-list-sum (cdr selector)))))
(defun ecss--selector-matched-specificity (selector subject adapter)
"Return matched specificity for SELECTOR, SUBJECT, and ADAPTER, or nil."
(when (ecss-selector-match-p selector subject adapter)
(if (eq (car selector) :list)
(ecss--specificity-max
(cl-loop for item in (cdr selector)
when (ecss-selector-match-p item subject adapter)
collect (ecss-selector-specificity item)))
(ecss-selector-specificity selector))))
(provide 'ecss-selector)
;;; ecss-selector.el ends here

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;;; ecss.el --- Pure extensible CSS cascade engine -*- lexical-binding: t; -*-
;; Copyright (C) 2026 Geekinney
;; Author: Geekinney <kinneyzhang666@gmail.com>
;; URL: https://github.com/geekinney/ecss
;; Version: 0.1.0
;; Package-Requires: ((emacs "28.1"))
;; Keywords: lisp, extensions
;; SPDX-License-Identifier: GPL-3.0-or-later
;; Assisted-by: Codex
;;; Commentary:
;; ECSS is a pure, consumer-independent selector and CSS cascade engine.
;; Consumers register their own property vocabulary, expose their own subject
;; values through adapters, and decide what computed values mean. ECSS never
;; mutates buffers and has no dependency on TP, Ebox, or the historical ECSS
;; repository.
;;; Code:
(require 'ecss-selector)
(require 'ecss-cascade)
(provide 'ecss)
;;; ecss.el ends here

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;;; ecss-cascade-tests.el --- Cascade tests -*- lexical-binding: t; -*-
;; Copyright (C) 2026 Geekinney
;; SPDX-License-Identifier: GPL-3.0-or-later
;;; Code:
(require 'ert)
(require 'cl-lib)
(require 'ecss-cascade)
(defun ecss-cascade-test--schemas ()
"Return the standard test schema set."
(let ((schemas (ecss-schema-set-create)))
(ecss-schema-set-define
schemas 'app/color :initial "black" :inherits t
:validator #'stringp)
(ecss-schema-set-define
schemas 'app/width :initial 0 :validator #'integerp)
(ecss-schema-set-define schemas 'app/payload :initial nil :inherits t)
(dolist (property '(app/padding-top app/padding-right
app/padding-bottom app/padding-left))
(ecss-schema-set-define
schemas property :initial 0 :validator #'integerp))
(ecss-schema-set-define
schemas 'app/padding
:shorthand
(lambda (value)
(list 'app/padding-top value 'app/padding-right value
'app/padding-bottom value 'app/padding-left value)))
schemas))
(defun ecss-cascade-test--subject (&rest options)
"Return a button subject using OPTIONS."
(apply #'ecss-subject-create :type "button" options))
(defun ecss-cascade-test--value (style property)
"Return PROPERTY from computed STYLE."
(ecss-computed-style-value style property :absent))
(ert-deftest ecss-cascade-test-schema-registration-is-atomic ()
(let ((schemas (ecss-schema-set-create)))
(ecss-schema-set-define schemas 'app/width :initial 4 :validator #'integerp)
(should-error
(ecss-schema-set-define schemas 'app/width :initial "bad"
:validator #'integerp)
:type 'ecss-invalid-property-schema)
(should (= (ecss-property-schema-initial
(ecss-schema-set-property schemas 'app/width))
4))
(should-error
(ecss-schema-set-define schemas 'not-namespaced :initial 1)
:type 'ecss-invalid-property-schema)
(should (equal (ecss-schema-set-property-ids schemas) '(app/width)))))
(ert-deftest ecss-cascade-test-computed-defaults-are-not-renormalized ()
(let ((schemas (ecss-schema-set-create))
(subject (ecss-cascade-test--subject))
(normalizations 0))
(ecss-schema-set-define
schemas 'app/value :initial 2 :inherits t
:normalizer (lambda (value) (cl-incf normalizations) (* value 10))
:validator #'integerp)
(let* ((initial (ecss-compute-style schemas subject))
(declared (ecss-compute-style
schemas subject :declarations '(app/value 3)))
(inherited (ecss-compute-style
schemas subject :parent-style declared))
(wide-initial
(ecss-compute-style
schemas subject :parent-style declared
:declarations
(list 'app/value (ecss-wide-value 'initial)))))
(should (= (ecss-cascade-test--value initial 'app/value) 20))
(should (= (ecss-cascade-test--value declared 'app/value) 30))
(should (= (ecss-cascade-test--value inherited 'app/value) 30))
(should (= (ecss-cascade-test--value wide-initial 'app/value) 20))
(should (= normalizations 2)))))
(ert-deftest ecss-cascade-test-shorthand-expands-once-and-preserves-important ()
(let* ((schemas (ecss-cascade-test--schemas))
(expanded (ecss-expand-declarations
schemas (list 'app/padding (ecss-important 3)))))
(should (equal (cl-loop for (property _value) on expanded by #'cddr
collect property)
'(app/padding-top app/padding-right
app/padding-bottom app/padding-left)))
(cl-loop for (_property value) on expanded by #'cddr
do (should (ecss--important-p value))
do (should (= (ecss--important-value value) 3)))))
(ert-deftest ecss-cascade-test-shorthand-and-longhand-follow-declaration-order ()
(let ((schemas (ecss-cascade-test--schemas))
(subject (ecss-cascade-test--subject)))
(should (= (ecss-cascade-test--value
(ecss-compute-style
schemas subject
:declarations '(app/padding 1 app/padding-left 2))
'app/padding-left)
2))
(should (= (ecss-cascade-test--value
(ecss-compute-style
schemas subject
:declarations '(app/padding-left 2 app/padding 1))
'app/padding-left)
1))))
(ert-deftest ecss-cascade-test-rule-addition-is-atomic ()
(let ((schemas (ecss-cascade-test--schemas))
(stylesheet (ecss-stylesheet-create)))
(ecss-stylesheet-add-rule
stylesheet schemas ".valid" '(app/color "blue") :layer 'base)
(should-error
(ecss-stylesheet-add-rule
stylesheet schemas ".broken" '(unknown/value 1) :layer 'broken)
:type 'ecss-invalid-declaration)
(should (equal (ecss-stylesheet-layers stylesheet) '(base)))
(should (= (length (ecss-stylesheet-rules stylesheet)) 1))))
(ert-deftest ecss-cascade-test-origin-importance-and-transition-order ()
(let ((schemas (ecss-cascade-test--schemas))
(stylesheet (ecss-stylesheet-create))
(subject (ecss-cascade-test--subject :classes '("target"))))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "ua") :origin 'ua)
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "user") :origin 'user)
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "author") :origin 'author)
(should (equal (ecss-cascade-test--value
(ecss-compute-style schemas subject :stylesheet stylesheet)
'app/color)
"author"))
(ecss-stylesheet-add-rule
stylesheet schemas ".target"
(list 'app/color (ecss-important "author-important"))
:origin 'author)
(ecss-stylesheet-add-rule
stylesheet schemas ".target"
(list 'app/color (ecss-important "user-important"))
:origin 'user)
(should (equal (ecss-cascade-test--value
(ecss-compute-style schemas subject :stylesheet stylesheet)
'app/color)
"user-important"))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "transition")
:origin 'transition)
(should (equal (ecss-cascade-test--value
(ecss-compute-style schemas subject :stylesheet stylesheet)
'app/color)
"transition"))))
(ert-deftest ecss-cascade-test-standard-origin-levels-are-complete ()
(let ((schemas (ecss-cascade-test--schemas))
(stylesheet (ecss-stylesheet-create))
(subject (ecss-cascade-test--subject :classes '("target"))))
(dolist (entry
(list (list 'author "author")
(list 'animation "animation")
(list 'author (ecss-important "author-important"))
(list 'user (ecss-important "user-important"))
(list 'ua (ecss-important "ua-important"))))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" (list 'app/color (cadr entry))
:origin (car entry)))
(should (equal (ecss-cascade-test--value
(ecss-compute-style schemas subject :stylesheet stylesheet)
'app/color)
"ua-important"))))
(ert-deftest ecss-cascade-test-layer-order-reverses-for-important ()
(let ((schemas (ecss-cascade-test--schemas))
(normal (ecss-stylesheet-create))
(important (ecss-stylesheet-create))
(subject (ecss-cascade-test--subject :classes '("target"))))
(ecss-stylesheet-declare-layers normal '(base components))
(ecss-stylesheet-add-rule
normal schemas ".target" '(app/color "base") :layer 'base)
(ecss-stylesheet-add-rule
normal schemas ".target" '(app/color "components") :layer 'components)
(ecss-stylesheet-add-rule normal schemas ".target" '(app/color "plain"))
(should (equal (ecss-cascade-test--value
(ecss-compute-style schemas subject :stylesheet normal)
'app/color)
"plain"))
(ecss-stylesheet-declare-layers important '(base components))
(dolist (entry '((base "base") (components "components") (nil "plain")))
(ecss-stylesheet-add-rule
important schemas ".target"
(list 'app/color (ecss-important (cadr entry)))
:layer (car entry)))
(should (equal (ecss-cascade-test--value
(ecss-compute-style schemas subject :stylesheet important)
'app/color)
"base"))
(should (equal (ecss-cascade-test--value
(ecss-compute-style
schemas subject :stylesheet important
:declarations
(list 'app/color (ecss-important "inline")))
'app/color)
"inline"))))
(ert-deftest ecss-cascade-test-layer-order-is-independent-per-origin ()
(let ((stylesheet (ecss-stylesheet-create)))
(ecss-stylesheet-declare-layers stylesheet '(base components) 'author)
(ecss-stylesheet-declare-layers stylesheet '(components base) 'user)
(should (equal (ecss-stylesheet-layers stylesheet 'author)
'(base components)))
(should (equal (ecss-stylesheet-layers stylesheet 'user)
'(components base)))))
(ert-deftest ecss-cascade-test-specificity-source-order-and-selector-list ()
(let ((schemas (ecss-cascade-test--schemas))
(stylesheet (ecss-stylesheet-create))
(subject (ecss-cascade-test--subject
:id "actual" :classes '("target"))))
(ecss-stylesheet-add-rule
stylesheet schemas "#other, .target" '(app/color "first"))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "later"))
(should (equal (ecss-cascade-test--value
(ecss-compute-style schemas subject :stylesheet stylesheet)
'app/color)
"later"))
(ecss-stylesheet-add-rule
stylesheet schemas "button#actual" '(app/color "id"))
(should (equal (ecss-cascade-test--value
(ecss-compute-style schemas subject :stylesheet stylesheet)
'app/color)
"id"))))
(ert-deftest ecss-cascade-test-scope-proximity-follows-specificity ()
(let* ((schemas (ecss-cascade-test--schemas))
(stylesheet (ecss-stylesheet-create))
(target (ecss-cascade-test--subject :classes '("target")))
(inner (ecss-subject-create
:type "section" :classes '("inner")
:children (list target)))
(_outer (ecss-subject-create
:type "main" :classes '("outer")
:children (list inner))))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "outer") :scope ".outer")
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "inner") :scope ".inner")
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "missing") :scope ".missing")
(should (equal (ecss-cascade-test--value
(ecss-compute-style schemas target :stylesheet stylesheet)
'app/color)
"inner"))))
(ert-deftest ecss-cascade-test-inheritance-distinguishes-nil-from-absence ()
(let* ((schemas (ecss-cascade-test--schemas))
(subject (ecss-cascade-test--subject))
(parent (ecss-compute-style
schemas subject
:declarations '(app/color "red" app/payload nil)))
(child (ecss-compute-style schemas subject :parent-style parent))
(initial (ecss-compute-style schemas subject)))
(should (equal (ecss-cascade-test--value child 'app/color) "red"))
(should (null (ecss-cascade-test--value child 'app/payload)))
(should (ecss-computed-style-present-p child 'app/payload))
(should-not (ecss-computed-style-present-p initial 'app/payload))))
(ert-deftest ecss-cascade-test-css-wide-values-use-cascade-not-symbol-reservation ()
(let* ((schemas (ecss-cascade-test--schemas))
(subject (ecss-cascade-test--subject :classes '("target")))
(parent (ecss-compute-style
schemas subject :declarations '(app/color "parent")))
(inherit (ecss-compute-style
schemas subject :parent-style parent
:declarations
(list 'app/color (ecss-wide-value 'inherit))))
(initial (ecss-compute-style
schemas subject :parent-style parent
:declarations
(list 'app/color (ecss-wide-value 'initial)))))
(should (equal (ecss-cascade-test--value inherit 'app/color) "parent"))
(should (equal (ecss-cascade-test--value initial 'app/color) "black"))
(should (equal (ecss-cascade-test--value
(ecss-compute-style
schemas subject :declarations '(app/payload inherit))
'app/payload)
'inherit))))
(ert-deftest ecss-cascade-test-revert-and-revert-layer-select-lower-candidates ()
(let ((schemas (ecss-cascade-test--schemas))
(stylesheet (ecss-stylesheet-create))
(subject (ecss-cascade-test--subject :classes '("target"))))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "ua") :origin 'ua)
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "author") :origin 'author)
(ecss-stylesheet-add-rule
stylesheet schemas ".target"
(list 'app/color (ecss-wide-value 'revert)) :origin 'author)
(should (equal (ecss-cascade-test--value
(ecss-compute-style schemas subject :stylesheet stylesheet)
'app/color)
"ua"))
(ecss-stylesheet-clear stylesheet)
(ecss-stylesheet-declare-layers stylesheet '(base components))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "base") :layer 'base)
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "components")
:layer 'components)
(ecss-stylesheet-add-rule
stylesheet schemas ".target"
(list 'app/color (ecss-wide-value 'revert-layer)) :layer 'components)
(should (equal (ecss-cascade-test--value
(ecss-compute-style schemas subject :stylesheet stylesheet)
'app/color)
"base"))))
(ert-deftest ecss-cascade-test-important-revert-removes-entire-origin ()
(let ((schemas (ecss-cascade-test--schemas))
(stylesheet (ecss-stylesheet-create))
(subject (ecss-cascade-test--subject :classes '("target"))))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "user") :origin 'user)
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "author-normal")
:origin 'author)
(ecss-stylesheet-add-rule
stylesheet schemas ".target"
(list 'app/color (ecss-important (ecss-wide-value 'revert)))
:origin 'author)
(should (equal (ecss-cascade-test--value
(ecss-compute-style schemas subject :stylesheet stylesheet)
'app/color)
"user"))))
(ert-deftest ecss-cascade-test-important-revert-layer-removes-entire-layer ()
(let ((schemas (ecss-cascade-test--schemas))
(stylesheet (ecss-stylesheet-create))
(subject (ecss-cascade-test--subject :classes '("target"))))
(ecss-stylesheet-declare-layers stylesheet '(base components))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "base") :layer 'base)
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "component-normal")
:layer 'components)
(ecss-stylesheet-add-rule
stylesheet schemas ".target"
(list 'app/color (ecss-important (ecss-wide-value 'revert-layer)))
:layer 'components)
(should (equal (ecss-cascade-test--value
(ecss-compute-style schemas subject :stylesheet stylesheet)
'app/color)
"base"))))
(ert-deftest ecss-cascade-test-custom-property-revert-removes-entire-origin ()
(let ((schemas (ecss-cascade-test--schemas))
(stylesheet (ecss-stylesheet-create))
(subject (ecss-cascade-test--subject :classes '("target"))))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(--theme 7) :origin 'user)
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(--theme 8) :origin 'author)
(ecss-stylesheet-add-rule
stylesheet schemas ".target"
(list '--theme (ecss-important (ecss-wide-value 'revert)))
:origin 'author)
(let ((style (ecss-compute-style
schemas subject :stylesheet stylesheet
:declarations (list 'app/width (ecss-var '--theme)))))
(should (= (ecss-cascade-test--value style 'app/width) 7)))))
(ert-deftest ecss-cascade-test-custom-properties-resolve-nested-values ()
(let* ((schemas (ecss-cascade-test--schemas))
(subject (ecss-cascade-test--subject))
(style (ecss-compute-style
schemas subject
:declarations
(list '--base 12 '--alias (ecss-var '--base)
'app/width (ecss-var '--alias)
'app/payload (list 'calc (ecss-var '--base))))))
(should (= (ecss-cascade-test--value style 'app/width) 12))
(should (equal (ecss-cascade-test--value style 'app/payload)
'(calc 12)))
(should (equal (ecss-computed-style-custom-properties style)
'(--alias 12 --base 12)))))
(ert-deftest ecss-cascade-test-custom-properties-inherit-by-default ()
(let* ((schemas (ecss-cascade-test--schemas))
(subject (ecss-cascade-test--subject))
(parent (ecss-compute-style
schemas subject :declarations '(--theme 17)))
(child (ecss-compute-style
schemas subject :parent-style parent
:declarations (list 'app/width (ecss-var '--theme)))))
(should (= (ecss-cascade-test--value child 'app/width) 17))
(should (equal (ecss-computed-style-custom-properties child)
'(--theme 17)))))
(ert-deftest ecss-cascade-test-variable-cycle-uses-outer-fallback ()
(let* ((schemas (ecss-cascade-test--schemas))
(style (ecss-compute-style
schemas (ecss-cascade-test--subject)
:declarations
(list '--a (ecss-var '--b) '--b (ecss-var '--a)
'app/width (ecss-var '--a 9)))))
(should (= (ecss-cascade-test--value style 'app/width) 9))
(should (equal (ecss-computed-style-diagnostics style)
'((:type variable-cycle :path (--a --b --a)))))
(should (null (ecss-computed-style-custom-properties style)))))
(ert-deftest ecss-cascade-test-parent-plist-is-snapshotted ()
(let* ((schemas (ecss-cascade-test--schemas))
(payload (list 'original))
(parent (list 'app/payload payload))
(style (ecss-compute-style
schemas (ecss-cascade-test--subject)
:parent-style parent)))
(setcar payload 'damaged)
(should (equal (ecss-cascade-test--value style 'app/payload)
'(original)))))
(ert-deftest ecss-cascade-test-invalid-winner-does-not-recascade ()
(let ((schemas (ecss-cascade-test--schemas))
(stylesheet (ecss-stylesheet-create))
(subject (ecss-cascade-test--subject :classes '("target"))))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/width 10))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/width "invalid"))
(let* ((style (ecss-compute-style
schemas subject :stylesheet stylesheet :provenance t))
(facts (plist-get (ecss-computed-style-provenance style)
'app/width)))
(should (= (ecss-cascade-test--value style 'app/width) 0))
(should (eq (plist-get facts :valid) nil))
(should (eq (plist-get facts :fallback) 'initial))
(should-not (ecss-computed-style-present-p style 'app/width)))))
(ert-deftest ecss-cascade-test-literal-functions-are-never-called ()
(let ((schemas (ecss-cascade-test--schemas)) (calls 0))
(let* ((literal (lambda () (cl-incf calls)))
(style (ecss-compute-style
schemas (ecss-cascade-test--subject)
:declarations (list 'app/payload literal))))
(should (zerop calls))
(should (functionp (ecss-cascade-test--value style 'app/payload))))))
(ert-deftest ecss-cascade-test-explicit-resolver-runs-once ()
(let ((schemas (ecss-cascade-test--schemas)) (calls 0))
(let* ((source (list :computed (lambda () (cl-incf calls) 42)))
(style
(ecss-compute-style
schemas (ecss-cascade-test--subject)
:declarations (list 'app/width source)
:value-resolver
(lambda (value _property _subject)
(if (eq (car-safe value) :computed)
(funcall (cadr value))
value)))))
(should (= calls 1))
(should (= (ecss-cascade-test--value style 'app/width) 42)))))
(ert-deftest ecss-cascade-test-resolver-never-runs-for-losing-sources ()
(let ((schemas (ecss-cascade-test--schemas))
(stylesheet (ecss-stylesheet-create))
(subject (ecss-cascade-test--subject :classes '("target")))
(calls 0))
(ecss-stylesheet-add-rule
stylesheet schemas ".target"
(list 'app/width (list :computed (lambda () (error "loser ran")))))
(ecss-stylesheet-add-rule
stylesheet schemas ".other"
(list 'app/width (list :computed (lambda () (error "unmatched ran")))))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/width 8))
(let ((style
(ecss-compute-style
schemas subject :stylesheet stylesheet
:value-resolver
(lambda (value _property _subject)
(cl-incf calls)
(if (eq (car-safe value) :computed)
(funcall (cadr value))
value)))))
(should (= (ecss-cascade-test--value style 'app/width) 8))
(should (= calls 1)))))
(ert-deftest ecss-cascade-test-resolver-skips-reverted-origin-losers ()
(let ((schemas (ecss-cascade-test--schemas))
(stylesheet (ecss-stylesheet-create))
(subject (ecss-cascade-test--subject :classes '("target")))
(calls 0))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/width 5) :origin 'ua)
(ecss-stylesheet-add-rule
stylesheet schemas ".target"
(list 'app/width (list :computed (lambda () (error "reverted loser ran"))))
:origin 'author)
(ecss-stylesheet-add-rule
stylesheet schemas ".target"
(list 'app/width (ecss-wide-value 'revert)) :origin 'author)
(let ((style
(ecss-compute-style
schemas subject :stylesheet stylesheet
:value-resolver
(lambda (value _property _subject)
(cl-incf calls)
(if (eq (car-safe value) :computed)
(funcall (cadr value))
value)))))
(should (= (ecss-cascade-test--value style 'app/width) 5))
(should (= calls 2)))))
(ert-deftest ecss-cascade-test-selected-resolver-errors-propagate ()
(let ((schemas (ecss-cascade-test--schemas)))
(should-error
(ecss-compute-style
schemas (ecss-cascade-test--subject)
:declarations '(app/width 1)
:value-resolver
(lambda (_value _property _subject) (error "resolver boom")))
:type 'error)))
(ert-deftest ecss-cascade-test-rule-list-is-an-independent-snapshot ()
(let ((schemas (ecss-cascade-test--schemas))
(stylesheet (ecss-stylesheet-create))
(subject (ecss-cascade-test--subject :classes '("target"))))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "snapshot"))
(let ((rules (ecss-stylesheet-rules stylesheet)))
(ecss-stylesheet-clear stylesheet)
(should (equal (ecss-cascade-test--value
(ecss-compute-style schemas subject :rules rules)
'app/color)
"snapshot"))
(should-error
(ecss-compute-style
schemas subject :stylesheet stylesheet :rules rules)
:type 'ecss-invalid-rule))))
(ert-deftest ecss-cascade-test-rule-snapshot-is-revalidated ()
(let ((schemas (ecss-cascade-test--schemas))
(stylesheet (ecss-stylesheet-create))
(subject (ecss-cascade-test--subject :classes '("target"))))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "snapshot"))
(let ((rules (ecss-stylesheet-rules stylesheet)))
(setf (ecss-rule-declarations (car rules)) '(foreign/value 1))
(should-error (ecss-compute-style schemas subject :rules rules)
:type 'ecss-invalid-declaration))))
(ert-deftest ecss-cascade-test-authoring-getters-are-defensive ()
(let ((schemas (ecss-cascade-test--schemas))
(stylesheet (ecss-stylesheet-create)))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(app/color "blue") :layer '(theme base))
(let ((schema (ecss-schema-set-property schemas 'app/color))
(rules (ecss-stylesheet-rules stylesheet))
(layers (ecss-stylesheet-layers stylesheet)))
(setf (ecss-property-schema-initial schema) "damaged")
(setf (ecss-rule-declarations (car rules)) '(app/color "damaged"))
(setcar (car layers) 'damaged)
(should (equal (ecss-property-schema-initial
(ecss-schema-set-property schemas 'app/color))
"black"))
(should (equal (ecss-rule-declarations
(car (ecss-stylesheet-rules stylesheet)))
'(app/color "blue")))
(should (equal (ecss-stylesheet-layers stylesheet)
'((theme base)))))))
(ert-deftest ecss-cascade-test-provenance-is-deterministic-and-defensive ()
(let ((schemas (ecss-cascade-test--schemas))
(stylesheet (ecss-stylesheet-create))
(subject (ecss-cascade-test--subject :classes '("target"))))
(ecss-stylesheet-add-rule
stylesheet schemas ".target" '(--z 3 --a 1 app/color "blue"))
(let* ((first (ecss-compute-style
schemas subject :stylesheet stylesheet :provenance t))
(second (ecss-compute-style
schemas subject :stylesheet stylesheet :provenance t))
(values (ecss-computed-style-values first))
(facts (ecss-computed-style-provenance first)))
(should (equal (ecss-computed-style-values first)
(ecss-computed-style-values second)))
(should (equal facts (ecss-computed-style-provenance second)))
(setcar values :damaged)
(setcar facts :damaged)
(should (equal (ecss-cascade-test--value first 'app/color) "blue"))
(should-not (eq (car (ecss-computed-style-provenance first))
:damaged)))))
(ert-deftest ecss-cascade-test-computation-never-mutates-a-buffer ()
(let ((schemas (ecss-cascade-test--schemas))
(subject (ecss-cascade-test--subject)))
(with-temp-buffer
(insert "sentinel")
(let ((before (buffer-string)))
(cl-letf (((symbol-function 'insert)
(lambda (&rest _args) (error "buffer write")))
((symbol-function 'delete-region)
(lambda (&rest _args) (error "buffer write")))
((symbol-function 'add-text-properties)
(lambda (&rest _args) (error "buffer write")))
((symbol-function 'put-text-property)
(lambda (&rest _args) (error "buffer write")))
((symbol-function 'erase-buffer)
(lambda (&rest _args) (error "buffer write")))
((symbol-function 'set-text-properties)
(lambda (&rest _args) (error "buffer write")))
((symbol-function 'remove-text-properties)
(lambda (&rest _args) (error "buffer write"))))
(should (ecss-computed-style-p
(ecss-compute-style
schemas subject :declarations '(app/color "blue")))))
(should (equal (buffer-string) before))))))
(provide 'ecss-cascade-tests)
;;; ecss-cascade-tests.el ends here

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;;; ecss-package-tests.el --- Package boundary tests -*- lexical-binding: t; -*-
;; Copyright (C) 2026 Geekinney
;; SPDX-License-Identifier: GPL-3.0-or-later
;;; Code:
(require 'ert)
(require 'package)
(require 'ecss)
(defconst ecss-package-test--root
(file-name-directory
(directory-file-name
(file-name-directory (or load-file-name buffer-file-name))))
"Absolute ecss repository root used by package tests.")
(defun ecss-package-test--source (file)
"Return FILE contents below the repository root."
(with-temp-buffer
(insert-file-contents (expand-file-name file ecss-package-test--root))
(buffer-string)))
(ert-deftest ecss-package-test-facade-loads-public-features-only ()
(should (featurep 'ecss))
(should (featurep 'ecss-selector))
(should (featurep 'ecss-cascade))
(should-not (featurep 'tp))
(should-not (featurep 'ebox)))
(ert-deftest ecss-package-test-production-has-no-tp-or-ebox-dependency ()
(dolist (file '("ecss.el" "ecss-selector.el" "ecss-cascade.el"))
(let ((source (ecss-package-test--source file)))
(should-not (string-match-p "(require[ \t\n]+['\"]tp" source))
(should-not (string-match-p "(require[ \t\n]+['\"]ebox" source))
(should-not (string-match-p "\\_<tp[-/]" source))
(should-not (string-match-p "\\_<ebox[-/]" source)))))
(ert-deftest ecss-package-test-main-metadata-is-installable ()
(with-temp-buffer
(insert-file-contents (expand-file-name "ecss.el" ecss-package-test--root))
(let ((description (package-buffer-info)))
(should (equal (package-desc-name description) 'ecss))
(should (version-list-<= '(28 1)
(cadr (assq 'emacs
(package-desc-reqs description)))))
(should (equal (package-version-join
(package-desc-version description))
"0.1.0")))))
(ert-deftest ecss-package-test-independent-schema-and-stylesheet-state ()
(let ((left-schemas (ecss-schema-set-create))
(right-schemas (ecss-schema-set-create))
(left-sheet (ecss-stylesheet-create))
(right-sheet (ecss-stylesheet-create)))
(ecss-schema-set-define left-schemas 'left/color :initial "left")
(ecss-schema-set-define right-schemas 'right/color :initial "right")
(ecss-stylesheet-add-rule
left-sheet left-schemas "*" '(left/color "changed"))
(should (null (ecss-stylesheet-rules right-sheet)))
(should (null (ecss-schema-set-property right-schemas 'left/color)))
(should (equal (ecss-computed-style-value
(ecss-compute-style
right-schemas (ecss-subject-create :type "node")
:stylesheet right-sheet)
'right/color)
"right"))))
(provide 'ecss-package-tests)
;;; ecss-package-tests.el ends here

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;;; ecss-selector-tests.el --- Selector tests -*- lexical-binding: t; -*-
;; Copyright (C) 2026 Geekinney
;; SPDX-License-Identifier: GPL-3.0-or-later
;;; Code:
(require 'ert)
(require 'ecss-selector)
(defun ecss-selector-test--tree ()
"Return a small subject tree for selector tests."
(let* ((label (ecss-subject-create
:type "span" :classes '("label")
:attributes '(("lang" . "en-US"))))
(button (ecss-subject-create
:type "button" :id "save" :classes '("primary" "action")
:attributes '(("data-kind" . "commit")
("data-tags" . "fast safe"))
:states '("hover") :children (list label)))
(cancel (ecss-subject-create
:type "button" :id "cancel" :classes '("action")))
(root (ecss-subject-create
:type "div" :classes '("app")
:children (list button cancel))))
(list root button cancel label)))
(ert-deftest ecss-selector-test-parser-matches-compounds-and-combinators ()
(pcase-let ((`(,_root ,button ,cancel ,label)
(ecss-selector-test--tree)))
(should (ecss-selector-match-p
"div.app > button#save.primary:hover > span.label" label))
(should (ecss-selector-match-p "div .label" label))
(should (ecss-selector-match-p "button + button#cancel" cancel))
(should (ecss-selector-match-p "button ~ button#cancel" cancel))
(should-not (ecss-selector-match-p "button#cancel" button))))
(ert-deftest ecss-selector-test-attribute-operators-and-flags ()
(pcase-let ((`(,_root ,button ,_cancel ,label)
(ecss-selector-test--tree)))
(should (ecss-selector-match-p "[data-kind]" button))
(should (ecss-selector-match-p "[data-kind=commit]" button))
(should (ecss-selector-match-p "[data-tags~=safe]" button))
(should (ecss-selector-match-p "[lang|=en]" label))
(should (ecss-selector-match-p "[data-kind^=com]" button))
(should (ecss-selector-match-p "[data-kind$=MIT i]" button))
(should-not (ecss-selector-match-p "[data-kind$=MIT s]" button))
(should (ecss-selector-match-p "[data-kind*=omm]" button))
(should-not (ecss-selector-match-p "[data-kind=other]" button))))
(ert-deftest ecss-selector-test-functional-pseudos-and-specificity ()
(pcase-let ((`(,root ,button ,_cancel ,_label)
(ecss-selector-test--tree)))
(should (ecss-selector-match-p "button:is(.primary, #other)" button))
(should (ecss-selector-match-p "button:not(.disabled)" button))
(should (ecss-selector-match-p "div:has(span.label)" root))
(should (equal (ecss-selector-specificity
"button:is(.primary, #other)")
'(1 0 1)))
(should (equal (ecss-selector-specificity
"button:where(.primary, #other)")
'(0 0 1)))))
(ert-deftest ecss-selector-test-has-supports-relative-combinators ()
(let* ((direct (ecss-subject-create :type "button" :classes '("direct")))
(nested (ecss-subject-create :type "span" :classes '("nested")))
(wrapper (ecss-subject-create :type "section" :children (list nested)))
(root (ecss-subject-create
:type "div" :children (list direct wrapper)))
(adjacent (ecss-subject-create :type "button" :id "adjacent"))
(later (ecss-subject-create :type "button" :id "later"))
(_siblings (ecss-subject-create
:type "row" :children (list root adjacent later))))
(should (ecss-selector-match-p "div:has(> button.direct)" root))
(should (ecss-selector-match-p "div:has(> section .nested)" root))
(should (ecss-selector-match-p "div:has(+ button#adjacent)" root))
(should (ecss-selector-match-p "div:has(~ button#later)" root))
(should-not (ecss-selector-match-p "div:has(> span.nested)" root))))
(ert-deftest ecss-selector-test-selector-lists-use-matching-branches ()
(pcase-let ((`(,_root ,button ,_cancel ,_label)
(ecss-selector-test--tree)))
(let ((selector (ecss-selector-parse "#other, .primary")))
(should (ecss-selector-match-p selector button))
(should (equal (ecss--selector-matched-specificity
selector button ecss-default-subject-adapter)
'(0 1 0))))))
(ert-deftest ecss-selector-test-structured-tokens-use-value-equality ()
(let ((subject (ecss-subject-create
:type (copy-sequence "button")
:classes (list (copy-sequence "primary"))
:states (list (copy-sequence "focus")))))
(should (ecss-selector-match-p '(:type "button") subject))
(should (ecss-selector-match-p '(:class "primary") subject))
(should (ecss-selector-match-p '(:state "focus") subject))))
(ert-deftest ecss-selector-test-caller-owned-subject-adapter ()
(let* ((root (vector "panel" "root" '("app") nil nil nil nil))
(child (vector "button" "save" '("primary")
'(("role" . "submit")) '("active") root nil))
(adapter
(ecss-subject-adapter-create
:type (lambda (node) (aref node 0))
:id (lambda (node) (aref node 1))
:classes (lambda (node) (aref node 2))
:attributes (lambda (node) (aref node 3))
:states (lambda (node) (aref node 4))
:parent (lambda (node) (aref node 5))
:children (lambda (node) (aref node 6)))))
(aset root 6 (list child))
(should (ecss-selector-match-p
"panel.app > button#save[role=submit]:active" child adapter))
(should (ecss-selector-match-p
"panel:has(button.primary)" root adapter))))
(ert-deftest ecss-selector-test-invalid-input-is-rejected ()
(should-error (ecss-selector-parse "") :type 'ecss-invalid-selector)
(should-error (ecss-selector-parse "div >") :type 'ecss-invalid-selector)
(should-error (ecss-selector-parse "[name=value q]")
:type 'ecss-invalid-selector)
(should-error (ecss-selector-normalize '(:unknown value))
:type 'ecss-invalid-selector))
(ert-deftest ecss-selector-test-comments-escapes-and-quoted-attributes ()
(let ((subject (ecss-subject-create
:type "div" :classes '("card" "a:b")
:attributes '(("title" . "Save now")))))
(should (ecss-selector-match-p "div/* comment */.card" subject))
(should (ecss-selector-match-p ".a\\:b" subject))
(should (ecss-selector-match-p "[title=\"Save now\"]" subject))))
(ert-deftest ecss-selector-test-subject-reparenting-detaches-old-parent ()
(let* ((child (ecss-subject-create :type "button"))
(old-parent (ecss-subject-create
:type "old" :children (list child)))
(new-parent (ecss-subject-create :type "new")))
(ecss-subject-set-children new-parent (list child))
(should (eq (ecss-subject-parent child) new-parent))
(should-not (memq child (ecss-subject-children old-parent)))
(should (memq child (ecss-subject-children new-parent)))))
(ert-deftest ecss-selector-test-subject-parent-construction-is-bidirectional ()
(let* ((parent (ecss-subject-create :type "panel"))
(child (ecss-subject-create :type "button" :parent parent)))
(should (eq (ecss-subject-parent child) parent))
(should (equal (ecss-subject-children parent) (list child)))
(should (ecss-selector-match-p "panel:has(> button)" parent))))
(provide 'ecss-selector-tests)
;;; ecss-selector-tests.el ends here