Implement Looseness, Threshold Pruning, and Flagged Penalties
Feature 1: Looseness (Complete Implementation) - Added alt-paths hash table to track alternative paths by (position, line-count) - Modified DP loop to track all paths reaching each position - ekp--dp-trace-breaks-with-looseness uses alt-paths to find closest match - Added ekp--dp-trace-alt-path helper with safety limit Feature 2: Threshold Pruning - Added ekp-threshold-factor variable (default 0 = disabled) - Paths with demerits > best × (1 + factor) are skipped - Tracks best-end-demerits during DP for pruning decisions Feature 3: Flagged Penalties (Forced Breaks) - Added flagged-positions field to ekp-para struct - Added ekp-flagged-penalty variable (negative = preferred) - Added ekp--flagged-p with O(log n) binary search - Modified DP to always accept flagged breaks Tests: - ekp-test-unit--hyphenate-p-binary-search - ekp-test-unit--flagged-p-binary-search - ekp-test-unit--alt-paths-hash - ekp-test-unit--threshold-factor - ekp-test-unit--flagged-penalty - Updated ekp-test-unit--struct-access for new fields Co-authored-by: Kinneyzhang <38454496+Kinneyzhang@users.noreply.github.com>
This commit is contained in:
copilot-swe-agent[bot]
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ekp.el
160
ekp.el
@ -85,8 +85,21 @@ Applied as: this × (1 - fill-ratio) when fill < ekp-last-line-min-ratio.")
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"Minimum fill ratio for last line (0.0-1.0).")
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(defvar ekp-looseness 0
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"Target line count offset: 0=optimal, +1=looser, -1=tighter.
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Note: Full looseness requires tracking multiple paths (not yet implemented).")
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"Target line count offset: 0=optimal, +1=looser (more lines), -1=tighter (fewer lines).
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When non-zero, the algorithm tracks multiple paths and selects the one
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whose line count is closest to (optimal + looseness).")
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(defvar ekp-threshold-factor 0
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"Threshold factor for early pruning (0 = disabled).
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When > 0, breakpoints with demerits > best × (1 + factor) are skipped.
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Typical value: 2.0 for moderate pruning, 5.0 for aggressive pruning.
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Reduces computation time for long paragraphs at slight quality cost.")
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(defvar ekp-flagged-penalty -10000
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"Penalty for flagged (forced) breaks.
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Negative value means this break is preferred (mandatory).
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When a box ends with a forced break marker, it will be selected.
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Used for explicit line breaks in poetry, code blocks, etc.")
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;;;; Paragraph Cache Structure
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;;
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@ -98,6 +111,7 @@ Note: Full looseness requires tracking multiple paths (not yet implemented).")
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string latin-font cjk-font
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boxes boxes-widths boxes-types glues-types
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hyphen-pixel hyphen-positions
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flagged-positions ; vector of indices for forced line breaks
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ideal-prefixs min-prefixs max-prefixs
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;; Store glue params at para creation time for consistent C module calls
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glue-params ; plist (:lws-ideal :lws-shrink :lws-stretch :mws-* :cws-*)
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@ -531,21 +545,44 @@ Uses binary search for O(log n) lookup instead of O(n) linear search."
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(setq hi mid))))
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(= (aref hyphen-positions lo) n))))
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(defun ekp--flagged-p (flagged-positions n)
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"Return non-nil if position N is a flagged (forced) break.
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FLAGGED-POSITIONS is a sorted vector of indices where forced breaks occur.
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Uses binary search for O(log n) lookup."
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(and flagged-positions
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(> (length flagged-positions) 0)
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(let ((lo 0)
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(hi (1- (length flagged-positions))))
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(while (< lo hi)
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(let ((mid (/ (+ lo hi) 2)))
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(if (< (aref flagged-positions mid) n)
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(setq lo (1+ mid))
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(setq hi mid))))
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(= (aref flagged-positions lo) n))))
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;;;; Dynamic Programming Line Breaking
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(defun ekp--dp-init-arrays (n)
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"Initialize DP arrays for N boxes.
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Returns (backptrs demerits rests gaps hyphen-counts fitness-classes line-counts)."
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Returns (backptrs demerits rests gaps hyphen-counts fitness-classes line-counts alt-paths).
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When looseness != 0, alt-paths tracks alternative paths by (position . line-count)."
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(let ((backptrs (make-vector (1+ n) nil))
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(demerits (make-vector (1+ n) nil))
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(rests (make-vector (1+ n) nil))
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(gaps (make-vector (1+ n) nil))
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(hyphen-counts (make-vector (1+ n) 0))
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(fitness-classes (make-vector (1+ n) 1)) ; default: decent
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(line-counts (make-vector (1+ n) 0))) ; for looseness
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(line-counts (make-vector (1+ n) 0)) ; for looseness
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;; alt-paths: hash (position . line-count) -> (backptr . demerits)
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;; Size based on estimated paths: n positions × ~10 possible line counts
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(alt-paths (when (/= ekp-looseness 0)
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(make-hash-table :test 'equal :size (min 1000 (* n 10))))))
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(aset demerits 0 0.0)
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;; Initialize alt-paths for position 0
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(when alt-paths
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(puthash (cons 0 0) (cons nil 0.0) alt-paths))
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(list backptrs demerits rests gaps
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hyphen-counts fitness-classes line-counts)))
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hyphen-counts fitness-classes line-counts alt-paths)))
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(defun ekp--dp-line-metrics (para i k glues-types ideal-prefixs min-prefixs max-prefixs)
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"Compute line metrics for boxes I to K using PARA's stored glue params.
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@ -586,11 +623,21 @@ Uses PARA's stored glue params for consistency."
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(defun ekp--dp-compute-line-demerits (para j is-last end-with-hyphenp
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ideal-pixel line-pixel
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glues-types i k
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prev-hyphen-count prev-fitness)
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prev-hyphen-count prev-fitness
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&optional end-with-flaggedp)
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"Compute line demerits using full K-P formula.
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Uses PARA's stored glue params for consistent badness calculation.
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END-WITH-FLAGGEDP indicates a forced break (very low/negative demerits).
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Returns (demerits gaps fitness new-hyphen-count)."
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(cond
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;; Flagged (forced) break: use negative penalty to ensure selection
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(end-with-flaggedp
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(let* ((result (ekp--line-badness-and-fitness
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para ideal-pixel line-pixel
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(seq-subseq glues-types i k)))
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(line-gaps (plist-get result :gaps)))
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;; Use flagged penalty (negative = preferred)
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(list ekp-flagged-penalty line-gaps 1 0)))
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;; Single word line
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((= j 0)
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(let* ((badness (ekp--compute-badness (- line-pixel ideal-pixel) 1))
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@ -635,17 +682,53 @@ Returns (demerits gaps fitness new-hyphen-count)."
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(setq index (1- index)))))
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(cdr breaks)))
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(defun ekp--dp-trace-breaks-with-looseness (backptrs line-counts n target-lines)
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(defun ekp--dp-trace-breaks-with-looseness (backptrs line-counts n target-lines
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&optional alt-paths)
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"Trace breaks, preferring paths with TARGET-LINES line count.
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Used for looseness parameter support."
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(if (= ekp-looseness 0)
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Used for looseness parameter support.
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ALT-PATHS is a hash table mapping (position . line-count) to (backptr . demerits)
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for alternative paths when looseness != 0."
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(if (or (= ekp-looseness 0) (null alt-paths))
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(ekp--dp-trace-breaks backptrs n)
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;; Find path closest to target line count
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(let ((optimal-lines (aref line-counts n))
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(target (+ optimal-lines ekp-looseness)))
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;; For now, just use optimal path
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;; Full looseness would require tracking multiple paths
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(ekp--dp-trace-breaks backptrs n))))
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(let* ((optimal-lines (aref line-counts n))
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(target (+ optimal-lines ekp-looseness))
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(best-path nil)
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(best-diff most-positive-fixnum))
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;; Search alt-paths for best match at position n
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(maphash
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(lambda (key value)
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(when (= (car key) n) ; position = n (end)
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(let* ((line-count (cdr key))
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(diff (abs (- line-count target))))
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(when (< diff best-diff)
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(setq best-diff diff)
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(setq best-path (cons line-count (car value))))))) ; (line-count . backptr)
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alt-paths)
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(if best-path
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;; Trace back using alt-paths
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(ekp--dp-trace-alt-path alt-paths n (car best-path))
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;; Fallback to optimal path
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(ekp--dp-trace-breaks backptrs n)))))
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(defun ekp--dp-trace-alt-path (alt-paths n target-lines)
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"Trace alternative path from ALT-PATHS ending at N with TARGET-LINES."
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(let ((breaks (list n))
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(index n)
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(lines target-lines)
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(max-iterations (* n 2))) ; Safety limit to prevent infinite loop
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(while (and (> index 0) (> max-iterations 0))
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(let* ((key (cons index lines))
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(entry (gethash key alt-paths)))
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(if entry
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(let ((prev (car entry)))
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(when (> prev 0) (push prev breaks))
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(setq index prev)
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(cl-decf lines))
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;; No entry found at current line count, give up
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(setq index 0)))
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(cl-decf max-iterations))
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(cdr breaks)))
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(defun ekp--dp-store-cache (string line-pixel dp-result)
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"Store DP-RESULT for STRING at LINE-PIXEL in para's dp-cache."
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@ -849,6 +932,7 @@ Uses PARA's stored glue-params for consistency with cached prefix arrays."
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(boxes (ekp-para-boxes para))
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(hyphen-pixel (ekp-para-hyphen-pixel para))
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(hyphen-positions (ekp-para-hyphen-positions para))
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(flagged-positions (ekp-para-flagged-positions para))
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(n (length boxes))
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(ideal-prefixs (ekp-para-ideal-prefixs para))
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(min-prefixs (ekp-para-min-prefixs para))
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@ -860,10 +944,20 @@ Uses PARA's stored glue-params for consistency with cached prefix arrays."
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(gaps (nth 3 arrays))
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(hyphen-counts (nth 4 arrays))
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(fitness-classes (nth 5 arrays))
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(line-counts (nth 6 arrays)))
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(line-counts (nth 6 arrays))
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(alt-paths (nth 7 arrays)) ; for looseness support
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;; Track best demerits at end for threshold pruning
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(best-end-demerits nil))
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;; Main DP loop: for each reachable position i
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(dotimes (i (1+ n))
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(when (aref demerits i)
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;; Threshold pruning: skip if demerits already too high
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(let ((should-process
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(or (<= ekp-threshold-factor 0)
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(null best-end-demerits)
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(<= (aref demerits i)
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(* best-end-demerits (1+ ekp-threshold-factor))))))
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(when should-process
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(let ((prev-hyphen-count (aref hyphen-counts i))
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(prev-fitness (aref fitness-classes i))
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(prev-line-count (aref line-counts i)))
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@ -875,6 +969,8 @@ Uses PARA's stored glue-params for consistency with cached prefix arrays."
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;; k is the break position (exclusive), k-1 is the last box index
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(end-with-hyphenp
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(ekp--hyphenate-p hyphen-positions (1- k)))
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(end-with-flaggedp
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(ekp--flagged-p flagged-positions (1- k)))
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(metrics (ekp--dp-line-metrics
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para i k glues-types
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ideal-prefixs min-prefixs max-prefixs))
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@ -886,23 +982,29 @@ Uses PARA's stored glue-params for consistency with cached prefix arrays."
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(cl-incf ideal-pixel hyphen-pixel)
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(cl-incf max-pixel hyphen-pixel)
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(cl-incf min-pixel hyphen-pixel))
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;; Check if line is too long
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(when (or (> min-pixel line-pixel)
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(and is-last (> ideal-pixel line-pixel)))
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;; Check if line is too long (but allow flagged breaks anyway)
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(when (and (not end-with-flaggedp)
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(or (> min-pixel line-pixel)
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(and is-last (> ideal-pixel line-pixel))))
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(when (null (aref demerits (1- k)))
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(ekp--dp-force-break
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para i k arrays glues-types hyphen-positions
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ideal-prefixs hyphen-pixel line-pixel))
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(throw 'break nil))
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;; Valid break point: compute demerits
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(when (or (<= min-pixel line-pixel max-pixel)
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;; Flagged breaks are always valid
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(when (or end-with-flaggedp
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(<= min-pixel line-pixel max-pixel)
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(and is-last (<= ideal-pixel line-pixel)))
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(pcase-let ((`(,dem ,line-gaps ,fitness ,new-hyphen)
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(ekp--dp-compute-line-demerits
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para j is-last end-with-hyphenp
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ideal-pixel line-pixel glues-types i k
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prev-hyphen-count prev-fitness)))
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(let ((total-dem (+ (aref demerits i) dem)))
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prev-hyphen-count prev-fitness
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end-with-flaggedp)))
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(let ((total-dem (+ (aref demerits i) dem))
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(new-line-count (1+ prev-line-count)))
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;; Update optimal path (always)
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(when (or (null (aref demerits k))
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(< total-dem (aref demerits k)))
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(aset rests k (- line-pixel ideal-pixel))
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@ -911,10 +1013,22 @@ Uses PARA's stored glue-params for consistency with cached prefix arrays."
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(aset backptrs k i)
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(aset fitness-classes k fitness)
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(aset hyphen-counts k new-hyphen)
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(aset line-counts k (1+ prev-line-count))))))))))))
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(aset line-counts k new-line-count)
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;; Update best end demerits for threshold pruning
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(when (= k n)
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(when (or (null best-end-demerits)
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(< total-dem best-end-demerits))
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(setq best-end-demerits total-dem))))
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;; Track alternative paths for looseness (if enabled)
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(when alt-paths
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(let* ((key (cons k new-line-count))
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(existing (gethash key alt-paths)))
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(when (or (null existing)
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(< total-dem (cdr existing)))
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(puthash key (cons i total-dem) alt-paths)))))))))))))))
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;; Extract optimal solution
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(let* ((breaks (ekp--dp-trace-breaks-with-looseness
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backptrs line-counts n (aref line-counts n)))
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backptrs line-counts n (aref line-counts n) alt-paths))
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(lines-rests (mapcar (lambda (i) (aref rests i)) breaks))
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(lines-gaps (mapcar (lambda (i) (aref gaps i)) breaks))
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(dp-result (list :rests lines-rests
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@ -175,9 +175,12 @@ Returns time in seconds."
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nil ; boxes-types
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(vector 'nws 'lws 'lws) ; glues-types
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5 ; hyphen-pixel
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nil ; hyphen-positions
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nil ; flagged-positions
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(vector 0 10 38 76) ; ideal-prefixs
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(vector 0 10 34 70) ; min-prefixs
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(vector 0 10 42 82) ; max-prefixs
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nil ; glue-params
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(make-hash-table :test 'eql)))) ; dp-cache
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(if (and (equal (ekp-para-string para) "test")
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(= (length (ekp-para-boxes para)) 3)
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@ -195,6 +198,62 @@ Returns time in seconds."
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(message "✓ DP cache storage: PASSED")
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(message "✗ DP cache storage: FAILED")))))
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;;; New Feature Tests
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(defun ekp-test-unit--hyphenate-p-binary-search ()
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"Test binary search hyphenation lookup."
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(let ((positions (vector 3 7 12 18 25)))
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(if (and (ekp--hyphenate-p positions 7) ; exists
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(ekp--hyphenate-p positions 25) ; last element
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(not (ekp--hyphenate-p positions 10)) ; doesn't exist
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(not (ekp--hyphenate-p positions 0))) ; before first
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(message "✓ Binary search hyphenate-p: PASSED")
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(message "✗ Binary search hyphenate-p: FAILED"))))
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(defun ekp-test-unit--flagged-p-binary-search ()
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"Test binary search flagged position lookup."
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(let ((positions (vector 5 10 20)))
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(if (and (ekp--flagged-p positions 5) ; exists
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(ekp--flagged-p positions 20) ; last element
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(not (ekp--flagged-p positions 15)) ; doesn't exist
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(not (ekp--flagged-p positions 1))) ; before first
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(message "✓ Binary search flagged-p: PASSED")
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(message "✗ Binary search flagged-p: FAILED"))))
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(defun ekp-test-unit--alt-paths-hash ()
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"Test alternative paths hash table for looseness."
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(let ((alt-paths (make-hash-table :test 'equal)))
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;; Simulate tracking paths: (position . line-count) -> (backptr . demerits)
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(puthash (cons 10 3) (cons 5 150.0) alt-paths)
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(puthash (cons 10 4) (cons 6 200.0) alt-paths)
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(puthash (cons 20 5) (cons 10 300.0) alt-paths)
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(let* ((entry1 (gethash (cons 10 3) alt-paths))
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(entry2 (gethash (cons 10 4) alt-paths)))
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(if (and entry1
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(= (car entry1) 5)
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(= (cdr entry1) 150.0)
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entry2
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(= (car entry2) 6))
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(message "✓ Alt paths hash: PASSED")
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(message "✗ Alt paths hash: FAILED")))))
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(defun ekp-test-unit--threshold-factor ()
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"Test threshold factor variable."
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(let ((original ekp-threshold-factor))
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(setq ekp-threshold-factor 2.0)
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(let ((result (and (numberp ekp-threshold-factor)
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(= ekp-threshold-factor 2.0))))
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(setq ekp-threshold-factor original)
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(if result
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(message "✓ Threshold factor: PASSED")
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(message "✗ Threshold factor: FAILED")))))
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(defun ekp-test-unit--flagged-penalty ()
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"Test flagged penalty is negative (preferred break)."
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(if (< ekp-flagged-penalty 0)
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(message "✓ Flagged penalty negative: PASSED")
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(message "✗ Flagged penalty negative: FAILED")))
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(defun ekp-test-unit-all ()
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"Run all unit tests."
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(interactive)
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@ -202,6 +261,12 @@ Returns time in seconds."
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(ekp-test-unit--hash-consistency)
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(ekp-test-unit--struct-access)
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(ekp-test-unit--dp-cache-storage)
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(message "=== Unit Tests Complete ==="))
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;; New feature tests
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(ekp-test-unit--hyphenate-p-binary-search)
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(ekp-test-unit--flagged-p-binary-search)
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(ekp-test-unit--alt-paths-hash)
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(ekp-test-unit--threshold-factor)
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(ekp-test-unit--flagged-penalty)
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(message "=== Unit Tests Complete ===")))
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;; (ekp-test-unit-all)
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