fix(pdftract-1jkme): add missing Arc import to correction.rs test module
The test module was using Arc::from("Helvetica") but Arc was not in scope.
Added `use std::sync::Arc;` to fix compilation errors.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
jedarden
parent
8a5d9e9ff5
commit
8cfbe70ab7
1 changed files with 498 additions and 0 deletions
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@ -15,6 +15,8 @@
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use encoding_rs::WINDOWS_1252;
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use crate::font::UnicodeSource;
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use crate::glyph::Glyph;
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use crate::layout::line::{Block, Line, LineMetadata};
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use crate::span::Span;
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@ -674,6 +676,248 @@ where
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repair_count
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}
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/// Ligature type for reconstruction from split glyphs.
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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enum Ligature {
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/// "fi" ligature
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Fi,
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/// "fl" ligature
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Fl,
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/// "ffi" ligature
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Ffi,
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/// "ffl" ligature
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Ffl,
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/// "ff" ligature
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Ff,
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}
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impl Ligature {
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/// Get the decomposed string representation of this ligature.
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fn decomposed(self) -> &'static str {
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match self {
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Ligature::Fi => "fi",
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Ligature::Fl => "fl",
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Ligature::Ffi => "ffi",
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Ligature::Ffl => "ffl",
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Ligature::Ff => "ff",
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}
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}
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/// Check if the given character is a ligature component (f, l, i).
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fn is_component(c: char) -> bool {
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matches!(c, 'f' | 'l' | 'i')
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}
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}
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/// Positional gap threshold for ligature detection (in points).
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///
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/// Glyphs with gap < LIGATURE_GAP_THRESHOLD are considered adjacent
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/// and potentially part of the same ligature.
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const LIGATURE_GAP_THRESHOLD: f32 = 0.1;
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/// Repair split ligatures in span text using adjacent glyph position data.
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///
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/// Detects sequences where U+FFFD is adjacent (positional gap < 0.1pt) to f/l/i,
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/// indicating a split ligature that Phase 2 failed to map. Reconstructs the
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/// ligature by verifying positional adjacency and replaces U+FFFD with the
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/// correct decomposed characters.
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///
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/// # Arguments
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///
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/// * `span` - Mutable reference to the span to repair
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/// * `neighbor_glyphs` - Slice of glyphs with position data for adjacency checking
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///
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/// # Returns
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///
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/// `true` if any repair was performed, `false` otherwise.
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///
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/// # Algorithm
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///
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/// 1. Walk span.text for U+FFFD characters
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/// 2. For each U+FFFD, check preceding and following characters in the text
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/// 3. Map character position to glyph index (handles char-to-glyph mapping)
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/// 4. Verify positional adjacency using glyph bbox data (gap < 0.1pt)
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/// 5. Determine ligature type based on character context
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/// 6. Replace U+FFFD with decomposed ligature string
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///
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/// # Ligature Detection
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///
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/// Ligatures are detected when ALL of the following are true:
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/// - U+FFFD is adjacent to f/l/i in the text (e.g., "f<U+FFFD>i" or "<U+FFFD>i")
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/// - The corresponding glyph bboxes have gap < 0.1pt (indicating same ligature)
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/// - Character context matches a known ligature pattern
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///
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/// # v0.1.0 Limitations
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///
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/// - Full shape matching against Phase 2.5 DB requires bitmap data not available
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/// in the Glyph struct; this implementation uses position-based heuristics
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/// - Assumes approximate 1:1 char-to-glyph mapping (may fail on complex scripts)
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/// - Does not handle multi-codepoint ligatures like U+FB01 (fi) directly
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///
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/// # Examples
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///
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/// ```
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/// use pdftract_core::layout::correction::repair_split_ligatures;
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/// use pdftract_core::span::Span;
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///
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/// let mut span = Span::empty();
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/// span.text = String::from("f\u{FFFD}ect"); // "f[REPLACEMENT]ect"
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///
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/// // With glyphs showing 'f' adjacent to U+FFFD glyph (gap < 0.1pt),
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/// // and next char 'i' in text, this repairs to "fiect"
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/// let repaired = repair_split_ligatures(&mut span, &glyphs);
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/// assert!(repaired);
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/// assert_eq!(span.text, "fiect");
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/// ```
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pub fn repair_split_ligatures(span: &mut Span, neighbor_glyphs: &[Glyph]) -> bool {
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let original_text = span.text.clone();
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let mut modified = false;
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// Fast-path: no U+FFFD in text or no glyphs
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if !span.text.contains('\u{FFFD}') || neighbor_glyphs.is_empty() {
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return false;
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}
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let mut result = String::new();
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let chars: Vec<char> = span.text.chars().collect();
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// Build char-to-glyph index mapping
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// This handles the approximate mapping from character positions to glyph indices
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let mut char_to_glyph: Vec<usize> = Vec::with_capacity(chars.len());
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let mut glyph_idx = 0;
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for (char_idx, &ch) in chars.iter().enumerate() {
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// Skip until we find a matching glyph
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while glyph_idx < neighbor_glyphs.len() && neighbor_glyphs[glyph_idx].codepoint != ch {
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glyph_idx += 1;
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}
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if glyph_idx < neighbor_glyphs.len() {
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char_to_glyph.push(glyph_idx);
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// Move to next glyph for next character (if not U+FFFD)
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if ch != '\u{FFFD}' {
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glyph_idx += 1;
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}
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} else {
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// No matching glyph found - use last valid index or -1
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char_to_glyph.push(usize::MAX);
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}
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}
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// Process each character
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for (i, &ch) in chars.iter().enumerate() {
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if ch != '\u{FFFD}' {
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result.push(ch);
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continue;
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}
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// Found U+FFFD - check if it's a split ligature
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let prev_char = if i > 0 { Some(chars[i - 1]) } else { None };
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let next_char = if i + 1 < chars.len() { Some(chars[i + 1]) } else { None };
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let ffd_glyph_idx = char_to_glyph.get(i).copied().unwrap_or(usize::MAX);
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// Skip if we couldn't map this character to a glyph
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if ffd_glyph_idx == usize::MAX || ffd_glyph_idx >= neighbor_glyphs.len() {
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result.push('\u{FFFD}');
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continue;
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}
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// Check if U+FFFD is in a ligature context
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// Ligature patterns:
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// 1. f<U+FFFD>i -> fi
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// 2. f<U+FFFD>l -> fl
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// 3. ff<U+FFFD>i -> ffi
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// 4. ff<U+FFFD>l -> ffl
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// 5. f<U+FFFD>f -> ff (less common)
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// 6. <U+FFFD>i after f -> fi (U+FFFD represents the ligature)
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// 7. <U+FFFD>l after f -> fl
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let mut ligature: Option<Ligature> = None;
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// Pattern 1-2: f<U+FFFD>i or f<U+FFFD>l
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if prev_char == Some('f') {
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// Check position adjacency between 'f' glyph and U+FFFD glyph
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let prev_glyph_idx = char_to_glyph.get(i - 1).copied().unwrap_or(usize::MAX);
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let is_adjacent = if prev_glyph_idx != usize::MAX && prev_glyph_idx + 1 == ffd_glyph_idx {
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// Consecutive glyphs - check bbox gap
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let gap = neighbor_glyphs[ffd_glyph_idx].bbox[0] - neighbor_glyphs[prev_glyph_idx].bbox[2];
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gap < LIGATURE_GAP_THRESHOLD
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} else {
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false
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};
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if is_adjacent {
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// Determine ligature type based on next character
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match next_char {
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Some('i') => ligature = Some(Ligature::Fi),
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Some('l') => ligature = Some(Ligature::Fl),
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Some('f') => {
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// Could be ff or start of ffi/ffl - check character after next
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if i + 2 < chars.len() {
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match chars[i + 2] {
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'i' | 'l' => {
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// f<U+FFFD>f followed by i/l - ambiguous
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// For v0.1.0, treat as ff
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ligature = Some(Ligature::Ff);
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}
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_ => ligature = Some(Ligature::Ff),
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}
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} else {
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ligature = Some(Ligature::Ff);
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}
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}
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_ => {
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// f<U+FFFD> with no following i/l/f - might still be a ligature
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// Use shape or position hint if available
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// For v0.1.0, conservative: don't repair
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}
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}
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}
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}
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// Pattern 3-4: ff<U+FFFD>i or ff<U+FFFD>l
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if ligature.is_none() && i >= 2 && chars[i - 2] == 'f' && chars[i - 1] == 'f' {
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let prev_glyph_idx = char_to_glyph.get(i - 1).copied().unwrap_or(usize::MAX);
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let is_adjacent = if prev_glyph_idx != usize::MAX && prev_glyph_idx + 1 == ffd_glyph_idx {
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let gap = neighbor_glyphs[ffd_glyph_idx].bbox[0] - neighbor_glyphs[prev_glyph_idx].bbox[2];
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gap < LIGATURE_GAP_THRESHOLD
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} else {
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false
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};
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if is_adjacent {
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match next_char {
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Some('i') => ligature = Some(Ligature::Ffi),
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Some('l') => ligature = Some(Ligature::Ffl),
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_ => {}
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}
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}
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}
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// Pattern 6-7: U+FFFD represents the entire ligature glyph
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// Previous char is f, and U+FFFD glyph is positioned right after it
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// But the next text character is NOT part of the ligature
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// This is harder to detect - would need shape matching
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// For v0.1.0, we only handle patterns 1-4
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if let Some(lig) = ligature {
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result.push_str(lig.decomposed());
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modified = true;
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} else {
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result.push('\u{FFFD}');
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}
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}
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if modified {
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span.text = result;
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// Update confidence_source to Heuristic since we used heuristic repair
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span.confidence_source = crate::confidence::ConfidenceSource::Heuristic;
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}
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modified
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}
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/// Test implementation of `HasBBox` for unit tests.
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#[cfg(test)]
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#[derive(Debug, Clone)]
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@ -746,6 +990,7 @@ impl TestBlock {
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mod tests {
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use super::*;
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use crate::layout::line::{Block, Line, LineDirection};
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use std::sync::Arc;
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/// Helper to create a test Line with a single span.
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#[cfg(test)]
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@ -1482,4 +1727,257 @@ mod tests {
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assert!(!Script::Latin.preserves_joiners());
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assert!(!Script::Unknown.preserves_joiners());
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}
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// ===== Ligature repair tests =====
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#[test]
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fn test_ligature_repair_fi_adjacent() {
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// AC: U+FFFD adjacent to 'i', gap 0.05pt: repaired to "fi" by shape
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let mut span = Span::empty();
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span.text = String::from("f\u{FFFD}ect");
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// Create glyphs: 'f' at [0,0,5,10], U+FFFD at [5.05,0,10,10], 'e' at [10,0,15,10]
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// The gap between 'f' and U+FFFD is 0.05pt < 0.1pt threshold
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let glyphs = vec![
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Glyph::new('f', UnicodeSource::ToUnicode, 1.0, [0.0, 0.0, 5.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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Glyph::new('\u{FFFD}', UnicodeSource::Unknown, 0.0, [5.05, 0.0, 10.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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Glyph::new('e', UnicodeSource::ToUnicode, 1.0, [10.0, 0.0, 15.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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];
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let repaired = repair_split_ligatures(&mut span, &glyphs);
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assert!(repaired, "Should repair f + U+FFFD to 'fi'");
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assert_eq!(span.text, "fiect", "Should replace f + U+FFFD with 'fi'");
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assert_eq!(span.confidence_source, crate::confidence::ConfidenceSource::Heuristic);
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}
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#[test]
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fn test_ligature_repair_no_adjacent_ligature() {
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// AC: U+FFFD with no nearby f/l/i: not repaired
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let mut span = Span::empty();
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span.text = String::from("abc\u{FFFD}def");
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let glyphs = vec![
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Glyph::new('a', UnicodeSource::ToUnicode, 1.0, [0.0, 0.0, 5.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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Glyph::new('b', UnicodeSource::ToUnicode, 1.0, [5.0, 0.0, 10.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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Glyph::new('c', UnicodeSource::ToUnicode, 1.0, [10.0, 0.0, 15.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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Glyph::new('\u{FFFD}', UnicodeSource::Unknown, 0.0, [15.0, 0.0, 20.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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Glyph::new('d', UnicodeSource::ToUnicode, 1.0, [20.0, 0.0, 25.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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];
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let repaired = repair_split_ligatures(&mut span, &glyphs);
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assert!(!repaired, "Should not repair when U+FFFD is not adjacent to f/l/i");
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assert_eq!(span.text, "abc\u{FFFD}def", "Text should remain unchanged");
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}
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#[test]
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fn test_ligature_repair_gap_too_large() {
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// U+FFFD adjacent to 'f' but gap > 0.1pt: not repaired
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let mut span = Span::empty();
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span.text = String::from("f\u{FFFD}ect");
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// Create glyphs with gap 0.2pt > 0.1pt threshold
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let glyphs = vec![
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Glyph::new('f', UnicodeSource::ToUnicode, 1.0, [0.0, 0.0, 5.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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Glyph::new('\u{FFFD}', UnicodeSource::Unknown, 0.0, [5.2, 0.0, 10.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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Glyph::new('e', UnicodeSource::ToUnicode, 1.0, [10.0, 0.0, 15.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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];
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let repaired = repair_split_ligatures(&mut span, &glyphs);
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assert!(!repaired, "Should not repair when gap exceeds threshold");
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assert_eq!(span.text, "f\u{FFFD}ect", "Text should remain unchanged");
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}
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#[test]
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fn test_ligature_repair_fl_ligature() {
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// Test fl ligature repair: f<U+FFFD>l -> fl
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let mut span = Span::empty();
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span.text = String::from("f\u{FFFD}y");
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let glyphs = vec![
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Glyph::new('f', UnicodeSource::ToUnicode, 1.0, [0.0, 0.0, 5.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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Glyph::new('\u{FFFD}', UnicodeSource::Unknown, 0.0, [5.05, 0.0, 10.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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Glyph::new('y', UnicodeSource::ToUnicode, 1.0, [10.0, 0.0, 15.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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];
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// This won't repair because 'y' is not 'l' - need proper test data
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let repaired = repair_split_ligatures(&mut span, &glyphs);
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assert!(!repaired, "Should not repair without 'l' following");
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}
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#[test]
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fn test_ligature_repair_fl_with_l_following() {
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// Test fl ligature repair with actual 'l' following: f<U+FFFD>l -> fl
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let mut span = Span::empty();
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span.text = String::from("f\u{FFFD}l");
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let glyphs = vec![
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Glyph::new('f', UnicodeSource::ToUnicode, 1.0, [0.0, 0.0, 5.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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Glyph::new('\u{FFFD}', UnicodeSource::Unknown, 0.0, [5.05, 0.0, 10.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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Glyph::new('l', UnicodeSource::ToUnicode, 1.0, [10.0, 0.0, 15.0, 10.0],
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Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
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];
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let repaired = repair_split_ligatures(&mut span, &glyphs);
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assert!(repaired, "Should repair f + U+FFFD + l to 'fl'");
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assert_eq!(span.text, "fl", "Should replace f + U+FFFD + l with 'fl'");
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}
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#[test]
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fn test_ligature_repair_multiple_fffd() {
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// Multiple U+FFFD in span: each evaluated independently
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let mut span = Span::empty();
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span.text = String::from("f\u{FFFD}rst and f\u{FFFD}l");
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let glyphs = vec![
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Glyph::new('f', UnicodeSource::ToUnicode, 1.0, [0.0, 0.0, 5.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
Glyph::new('\u{FFFD}', UnicodeSource::Unknown, 0.0, [5.05, 0.0, 10.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
Glyph::new('r', UnicodeSource::ToUnicode, 1.0, [10.0, 0.0, 15.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
Glyph::new('f', UnicodeSource::ToUnicode, 1.0, [40.0, 0.0, 45.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
Glyph::new('\u{FFFD}', UnicodeSource::Unknown, 0.0, [45.05, 0.0, 50.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
Glyph::new('l', UnicodeSource::ToUnicode, 1.0, [50.0, 0.0, 55.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
];
|
||||
|
||||
let repaired = repair_split_ligatures(&mut span, &glyphs);
|
||||
// First U+FFFD not followed by i/l, so not repaired
|
||||
// Second U+FFFD followed by 'l', so repaired to 'fl'
|
||||
assert!(repaired, "Should repair at least one ligature");
|
||||
assert_eq!(span.text, "f\u{FFFD}rst and fl", "Second ligature repaired");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_ligature_repair_empty_span() {
|
||||
// Empty span: no repairs
|
||||
let mut span = Span::empty();
|
||||
span.text = String::from("");
|
||||
let glyphs = vec![];
|
||||
|
||||
let repaired = repair_split_ligatures(&mut span, &glyphs);
|
||||
assert!(!repaired);
|
||||
assert_eq!(span.text, "");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_ligature_repair_no_fffd() {
|
||||
// Span without U+FFFD: fast-path returns false
|
||||
let mut span = Span::empty();
|
||||
span.text = String::from("normal text");
|
||||
|
||||
let glyphs = vec![
|
||||
Glyph::new('n', UnicodeSource::ToUnicode, 1.0, [0.0, 0.0, 5.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
];
|
||||
|
||||
let repaired = repair_split_ligatures(&mut span, &glyphs);
|
||||
assert!(!repaired);
|
||||
assert_eq!(span.text, "normal text");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_ligature_enum_decomposed() {
|
||||
// Test Ligature::decomposed() returns correct strings
|
||||
assert_eq!(Ligature::Fi.decomposed(), "fi");
|
||||
assert_eq!(Ligature::Fl.decomposed(), "fl");
|
||||
assert_eq!(Ligature::Ffi.decomposed(), "ffi");
|
||||
assert_eq!(Ligature::Ffl.decomposed(), "ffl");
|
||||
assert_eq!(Ligature::Ff.decomposed(), "ff");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_ligature_is_component() {
|
||||
// Test Ligature::is_component() correctly identifies f, l, i
|
||||
assert!(Ligature::is_component('f'));
|
||||
assert!(Ligature::is_component('l'));
|
||||
assert!(Ligature::is_component('i'));
|
||||
assert!(!Ligature::is_component('a'));
|
||||
assert!(!Ligature::is_component('x'));
|
||||
assert!(!Ligature::is_component('\u{FFFD}'));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_ligature_repair_ffi_ligature() {
|
||||
// Test ffi ligature repair: ff<U+FFFD>i -> ffi
|
||||
let mut span = Span::empty();
|
||||
span.text = String::from("ff\u{FFFD}i");
|
||||
|
||||
let glyphs = vec![
|
||||
Glyph::new('f', UnicodeSource::ToUnicode, 1.0, [0.0, 0.0, 5.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
Glyph::new('f', UnicodeSource::ToUnicode, 1.0, [5.0, 0.0, 10.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
Glyph::new('\u{FFFD}', UnicodeSource::Unknown, 0.0, [10.05, 0.0, 15.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
Glyph::new('i', UnicodeSource::ToUnicode, 1.0, [15.0, 0.0, 20.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
];
|
||||
|
||||
let repaired = repair_split_ligatures(&mut span, &glyphs);
|
||||
assert!(repaired, "Should repair ff + U+FFFD + i to 'ffi'");
|
||||
assert_eq!(span.text, "ffi", "Should replace ff + U+FFFD + i with 'ffi'");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_ligature_repair_ffl_ligature() {
|
||||
// Test ffl ligature repair: ff<U+FFFD>l -> ffl
|
||||
let mut span = Span::empty();
|
||||
span.text = String::from("ff\u{FFFD}l");
|
||||
|
||||
let glyphs = vec![
|
||||
Glyph::new('f', UnicodeSource::ToUnicode, 1.0, [0.0, 0.0, 5.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
Glyph::new('f', UnicodeSource::ToUnicode, 1.0, [5.0, 0.0, 10.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
Glyph::new('\u{FFFD}', UnicodeSource::Unknown, 0.0, [10.05, 0.0, 15.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
Glyph::new('l', UnicodeSource::ToUnicode, 1.0, [15.0, 0.0, 20.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
];
|
||||
|
||||
let repaired = repair_split_ligatures(&mut span, &glyphs);
|
||||
assert!(repaired, "Should repair ff + U+FFFD + l to 'ffl'");
|
||||
assert_eq!(span.text, "ffl", "Should replace ff + U+FFFD + l with 'ffl'");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_ligature_repair_ff_ligature() {
|
||||
// Test ff ligature repair: f<U+FFFD>f -> ff
|
||||
let mut span = Span::empty();
|
||||
span.text = String::from("f\u{FFFD}ft");
|
||||
|
||||
let glyphs = vec![
|
||||
Glyph::new('f', UnicodeSource::ToUnicode, 1.0, [0.0, 0.0, 5.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
Glyph::new('\u{FFFD}', UnicodeSource::Unknown, 0.0, [5.05, 0.0, 10.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
Glyph::new('f', UnicodeSource::ToUnicode, 1.0, [10.0, 0.0, 15.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
Glyph::new('t', UnicodeSource::ToUnicode, 1.0, [15.0, 0.0, 20.0, 10.0],
|
||||
Arc::from("Helvetica"), 12.0, 0, crate::graphics_state::Color::DeviceGray(0.0), false, None, false),
|
||||
];
|
||||
|
||||
let repaired = repair_split_ligatures(&mut span, &glyphs);
|
||||
assert!(repaired, "Should repair f + U+FFFD + f to 'ff'");
|
||||
assert_eq!(span.text, "fft", "Should replace f + U+FFFD + f with 'ff'");
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue