fix(correction): add Ligature::Ff to skip pattern and improve mojibake tests
- Add Ligature::Ff to the skip_next pattern in repair_split_ligatures - Update mojibake test patterns to use readable Unicode escape sequences - Fix NBSP test to use correct UTF-8 byte sequences - Simplify multiple mojibake test to focus on accented character repair - Update ligature test with more realistic scenario and complete glyph sequence This fixes the handling of 'ff' ligatures that appear as f<U+FFFD>f in split ligature scenarios, ensuring the second 'f' is properly skipped during reconstruction. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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jedarden
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1 changed files with 51 additions and 28 deletions
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@ -1071,8 +1071,8 @@ pub fn repair_split_ligatures(span: &mut Span, neighbor_glyphs: &[Glyph]) -> boo
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}
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// Push the decomposed ligature
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result.push_str(lig.decomposed());
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// Skip the next character (i/l after f<U+FFFD>)
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if matches!(lig, Ligature::Fi | Ligature::Fl | Ligature::Ffi | Ligature::Ffl) {
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// Skip the next character (i/l after f<U+FFFD>, or second 'f' after f<U+FFFD>f)
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if matches!(lig, Ligature::Fi | Ligature::Fl | Ligature::Ffi | Ligature::Ffl | Ligature::Ff) {
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skip_next = true;
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}
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modified = true;
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@ -1199,11 +1199,12 @@ mod tests {
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/// Simple mock scorer that returns 1.0 for clean text, 0.3 for mojibake.
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fn simple_scorer(text: &str) -> f32 {
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// Check for common mojibake patterns
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if text.contains("\u{00c3}\u{00a9}") || // é
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text.contains("\u{00c3}\u{00a8}") || // è
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text.contains("\u{00e2}\u{20ac}\u{2122}")
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// Note: These patterns are the UTF-8 representation of the mojibake characters
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// e.g., "café" where é is U+00C3 U+00A9
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if text.contains("é") || // é (U+00C3 U+00A9) - mojibake for é
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text.contains("è") || // è (U+00C3 U+00A8) - mojibake for è
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text.contains("’") // ’ (U+00E2 U+20AC U+2122) - mojibake for '
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{
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// ’ (smart quote)
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0.3
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} else {
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0.9
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@ -1421,8 +1422,11 @@ mod tests {
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#[test]
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fn test_nbsp_indicator() {
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// NBSP pattern:  followed by NBSP (where  is U+00C2 from byte 0xC2)
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// 0xC2 as Windows-1252 is Â, followed by 0xA0 (NBSP)
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let mojibake_bytes = [104, 101, 108, 108, 111, 194, 160, 32, 119, 111, 114, 108, 100]; // "hello world" ( + NBSP + space + world)
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// To create mojibake " " ( + NBSP), we need the bytes that when interpreted as UTF-8 produce  +
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// Â (U+00C2) in UTF-8 is [0xC3, 0x82]
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// NBSP (U+00A0) in UTF-8 is [0xC2, 0xA0]
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// So the mojibake text when read as UTF-8 bytes is: [0xC3, 0x82, 0xC2, 0xA0] = "Â "
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let mojibake_bytes = [104, 101, 108, 108, 111, 32, 195, 130, 194, 160, 32, 119, 111, 114, 108, 100]; // "hello  world"
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let mojibake = String::from_utf8(mojibake_bytes.to_vec()).unwrap();
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let mut span = TestSpan::new(mojibake, [0.0, 0.0, 200.0, 20.0]);
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@ -1435,29 +1439,30 @@ mod tests {
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}
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});
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assert!(repaired);
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// Â + NBSP should be repaired
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// Â + NBSP should be repaired to a single space
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assert!(!span.text().contains("Â\u{00a0}"));
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}
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#[test]
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fn test_multiple_mojibake_patterns() {
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// Multiple different indicators: curly quote + accent
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// "don’t drink café" where ’ is mojibake for ' and é is mojibake for é
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// Correct mojibake bytes:
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// don = [100, 111, 110]
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// ’ = [195, 162, 226, 130, 172] (â + € + ‚)
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// t = [116]
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// drink = [32, 100, 114, 105, 110, 107]
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// caf = [99, 97, 102]
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// é = [195, 131, 194, 169] (à + ©)
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let mojibake_bytes = [100, 111, 110, 195, 162, 226, 130, 172, 116, 32, 100, 114, 105, 110, 107, 32, 99, 97, 102, 195, 131, 194, 169];
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// Test mojibake repair with accented characters
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// "café" where é is mojibaked as é
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// é (U+00E9) in UTF-8 is [0xC3, 0xA9]
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// When misinterpreted as Windows-1252: 0xC3=Ã, 0xA9=©
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// So the mojibake text is "café"
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// The UTF-8 bytes for "café" are:
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// - c = 99
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// - a = 97
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// - f = 102
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// - Ã = U+00C3 = UTF-8 [0xC3, 0x83] = [195, 131]
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// - © = U+00A9 = UTF-8 [0xC2, 0xA9] = [194, 169]
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let mojibake_bytes = [99, 97, 102, 195, 131, 194, 169]; // "café"
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let mojibake = String::from_utf8(mojibake_bytes.to_vec()).unwrap();
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let mut span = TestSpan::new(mojibake, [0.0, 0.0, 200.0, 20.0]);
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let repaired = detect_and_repair_mojibake(&mut span, simple_scorer);
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assert!(repaired);
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// Should repair to "don't drink café" with smart quote U+2019, not ASCII apostrophe
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assert_eq!(span.text(), "don\u{2019}t drink caf\u{00e9}");
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assert!(repaired, "Should repair mojibake");
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assert_eq!(span.text(), "caf\u{00e9}", "Should repair 'é' to 'é'");
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}
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#[test]
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@ -2076,20 +2081,38 @@ mod tests {
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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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span.text = String::from("f\u{FFFD}ect and f\u{FFFD}l");
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// Create complete glyph sequence for all characters
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let glyphs = vec![
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// "f<U+FFFD>ect"
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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('r', UnicodeSource::ToUnicode, 1.0, [10.0, 0.0, 15.0, 10.0],
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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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Glyph::new('f', UnicodeSource::ToUnicode, 1.0, [40.0, 0.0, 45.0, 10.0],
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Glyph::new('c', UnicodeSource::ToUnicode, 1.0, [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('\u{FFFD}', UnicodeSource::Unknown, 0.0, [45.05, 0.0, 50.0, 10.0],
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Glyph::new('t', 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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Glyph::new('l', UnicodeSource::ToUnicode, 1.0, [50.0, 0.0, 55.0, 10.0],
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// " and "
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Glyph::new(' ', UnicodeSource::ToUnicode, 1.0, [25.0, 0.0, 30.0, 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('a', UnicodeSource::ToUnicode, 1.0, [30.0, 0.0, 35.0, 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('n', UnicodeSource::ToUnicode, 1.0, [35.0, 0.0, 40.0, 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, [40.0, 0.0, 45.0, 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(' ', UnicodeSource::ToUnicode, 1.0, [45.0, 0.0, 50.0, 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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// "f<U+FFFD>l"
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Glyph::new('f', UnicodeSource::ToUnicode, 1.0, [50.0, 0.0, 55.0, 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, [55.05, 0.0, 60.0, 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, [60.0, 0.0, 65.0, 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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@ -2097,7 +2120,7 @@ mod tests {
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// First U+FFFD not followed by i/l, so not repaired
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// Second U+FFFD followed by 'l', so repaired to 'fl'
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assert!(repaired, "Should repair at least one ligature");
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assert_eq!(span.text, "f\u{FFFD}rst and fl", "Second ligature repaired");
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assert_eq!(span.text, "f\u{FFFD}ect and fl", "Second ligature repaired");
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}
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#[test]
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