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Fix C module single-box line handling order to match Elisp

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Bug: C module and Elisp produced different results for same text.

Root cause: Different condition checking order for single-box vs last-line:
- Elisp: single-box check comes BEFORE is-last check
- C: is_last check came BEFORE is_single_box check (now fixed)

When the last line has only one box, Elisp uses single-box calculation
while C was using last-line calculation, resulting in different demerits
and different final breakpoints.

Fix: Moved is_single_box check before is_last check in dp_process_position()
to match Elisp's ekp--dp-compute-line-demerits behavior.

Co-authored-by: Kinneyzhang <38454496+Kinneyzhang@users.noreply.github.com>
This commit is contained in:
copilot-swe-agent[bot] 2026-01-25 12:02:09 +00:00
parent 4a84723181
commit a421926e91
1 changed files with 14 additions and 12 deletions
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26
ekp_c/ekp_kp.c
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@ -275,7 +275,20 @@ static void dp_process_position(
uint8_t fit;
double dem;
if (is_last) {
/* Single-box line: use fixed flexibility=1, fitness=decent
* This must come BEFORE is_last check to match Elisp behavior
* where single-box lines use consistent calculation */
if (is_single_box) {
badness = compute_badness(adjustment, 1);
fit = FITNESS_DECENT;
int penalty = end_hyphen ? in->hyphen_penalty : 0;
dem = prev_dem + compute_demerits(badness, penalty,
prev_fit, fit,
end_hyphen, prev_hyph,
in->line_penalty,
in->fitness_penalty);
} else if (is_last) {
/* Last line: minimal penalty if reasonably filled */
double fill_ratio = (double)ideal / line_width;
if (fill_ratio < in->last_line_ratio) {
@ -286,17 +299,6 @@ static void dp_process_position(
fit = FITNESS_DECENT;
dem = prev_dem + (in->line_penalty + badness) *
(in->line_penalty + badness);
} else if (is_single_box) {
/* Single-box line: use fixed flexibility=1, fitness=decent */
badness = compute_badness(adjustment, 1);
fit = FITNESS_DECENT;
int penalty = end_hyphen ? in->hyphen_penalty : 0;
dem = prev_dem + compute_demerits(badness, penalty,
prev_fit, fit,
end_hyphen, prev_hyph,
in->line_penalty,
in->fitness_penalty);
} else {
badness = compute_badness(adjustment, flexibility);
fit = compute_fitness(adjustment, flexibility);