mirror of
https://github.com/storytold/figcraft.git
synced 2026-10-28 20:36:55 -06:00
587 lines
24 KiB
Rust
587 lines
24 KiB
Rust
use super::*;
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use figcraft_doc::{TextAlignH, TextData, TextDecoration};
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fn have_fonts() -> bool {
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db().write().unwrap().default_face().is_some() || {
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scan_system_fonts();
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db().write().unwrap().default_face().is_some()
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}
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}
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#[test]
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fn lays_out_single_line() {
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if !have_fonts() {
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eprintln!("no fonts; skipping");
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return;
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}
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let mut t = TextData::new("Hello");
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t.style.font_size = 20.0;
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let l = layout(&t, None, None);
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assert_eq!(l.lines.len(), 1);
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assert!(l.glyphs.len() >= 5);
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assert!(l.width > 30.0 && l.width < 100.0, "{}", l.width);
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assert!(l.height > 20.0 && l.height < 30.0, "{}", l.height);
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// Caret moves right.
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assert!(l.caret(3).0 > l.caret(1).0);
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assert_eq!(l.hit(-5.0, 5.0), 0);
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assert_eq!(l.hit(1000.0, 5.0), 5);
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}
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#[test]
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fn newline_and_wrap() {
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if !have_fonts() {
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return;
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}
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let mut t = TextData::new("one two three four five six\nseven");
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t.auto_resize = figcraft_doc::TextAutoResize::Height;
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let l = layout(&t, Some(60.0), None);
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assert!(l.lines.len() >= 3, "{}", l.lines.len());
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assert!(l.lines.iter().all(|ln| ln.width <= 60.0 + 1e-6 || ln.glyph_end - ln.glyph_start <= 1));
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// Auto width ignores the box.
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t.auto_resize = figcraft_doc::TextAutoResize::WidthAndHeight;
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assert_eq!(layout(&t, Some(60.0), None).lines.len(), 2);
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}
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#[test]
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fn alignment_and_decoration() {
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if !have_fonts() {
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return;
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}
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let mut t = TextData::new("Hi");
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t.auto_resize = figcraft_doc::TextAutoResize::None;
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t.align_h = TextAlignH::Right;
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t.style.decoration = TextDecoration::Underline;
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let l = layout(&t, Some(200.0), None);
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let last = l.glyphs.last().unwrap();
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assert!((last.x + last.advance - 200.0).abs() < 0.5);
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assert_eq!(l.decorations.len(), 1);
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}
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#[test]
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fn empty_and_hostile_inputs() {
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if !have_fonts() {
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return;
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}
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let mut t = TextData::new("");
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let l = layout(&t, None, None);
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assert_eq!(l.lines.len(), 1);
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assert!(l.height > 0.0);
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t.characters = "\n\n".into();
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assert_eq!(layout(&t, None, None).lines.len(), 3);
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t.style.font_size = f64::NAN;
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t.characters = "x".into();
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let _ = layout(&t, Some(f64::NAN), Some(-1.0));
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t.runs.push(figcraft_doc::StyleRun { start: 5, end: 2, style: Default::default() });
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let _ = layout(&t, None, None);
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let mut emoji = TextData::new("a😀b 漢字 ß");
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emoji.style.case = figcraft_doc::TextCase::Upper;
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let l = layout(&emoji, None, None);
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assert!(!l.glyphs.is_empty());
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}
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#[test]
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fn truncate() {
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if !have_fonts() {
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return;
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}
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let mut t = TextData::new("a very long line of text that will not fit at all");
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t.auto_resize = figcraft_doc::TextAutoResize::Truncate;
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let l = layout(&t, Some(80.0), Some(16.0));
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assert!(l.truncated);
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assert_eq!(l.lines.len(), 1);
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}
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#[test]
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fn glyph_paths_have_area() {
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if !have_fonts() {
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return;
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}
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use figcraft_geom::Shape;
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let t = TextData::new("O");
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let l = layout(&t, None, None);
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let p = l.to_path();
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assert!(p.area().abs() > 1.0);
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}
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fn inter() -> Option<std::sync::Arc<Face>> {
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if !have_fonts() {
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return None;
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}
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db().write().unwrap().find("Inter", "Regular").filter(|f| f.family == "Inter")
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}
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#[test]
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fn opentype_features_change_shaping() {
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let Some(face) = inter() else {
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eprintln!("Inter not embedded; skipping");
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return;
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};
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let mut t = TextData::new("1111 0");
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t.style.font_size = 20.0;
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let base = layout(&t, None, None);
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if face.has_feature(b"tnum") {
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t.features.insert("tnum".into(), true);
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let tab = layout(&t, None, None);
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assert!((tab.width - base.width).abs() > 0.01, "tnum should change digit widths");
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t.features.clear();
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}
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if face.has_feature(b"zero") {
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t.features.insert("zero".into(), true);
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let z = layout(&t, None, None);
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let zero_gid = |l: &TextLayout| l.glyphs.iter().find(|g| g.char_start == 5).map(|g| g.gid);
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assert_ne!(zero_gid(&z), zero_gid(&base), "zero should pick the slashed zero");
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}
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// Invalid tags are ignored, never a crash.
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t.features.insert("bogus-tag".into(), true);
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t.features.insert("".into(), false);
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let _ = layout(&t, None, None);
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}
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#[test]
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fn small_caps_native_or_synthesised() {
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let Some(face) = inter() else { return };
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let mut t = TextData::new("Ab");
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t.style.font_size = 20.0;
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let orig = layout(&t, None, None);
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t.style.case = figcraft_doc::TextCase::SmallCaps;
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let sc = layout(&t, None, None);
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let b = |l: &TextLayout| l.glyphs.iter().find(|g| g.char_start == 1).cloned().unwrap();
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let (ob, sb) = (b(&orig), b(&sc));
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assert_ne!(ob.gid, sb.gid, "the lower-case b becomes a small capital");
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if !face.has_feature(b"smcp") {
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// Synthesised: a capital B drawn smaller than the A.
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assert_eq!(sb.gid, face.glyph_for('B'));
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assert!(sb.size < 20.0);
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}
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// Upper-case letters are untouched.
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assert_eq!(sc.glyphs.iter().find(|g| g.char_start == 0).unwrap().gid, face.glyph_for('A'));
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}
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#[test]
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fn title_case_across_runs() {
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let Some(face) = inter() else { return };
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let mut t = TextData::new("hello world");
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t.style.case = figcraft_doc::TextCase::Title;
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// "hel" bold, "lo world" regular: the word continues across the run boundary.
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t.restyle(0, 3, |s| s.font_style = "Bold".into());
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let l = layout(&t, None, None);
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let gid_at = |i: usize| l.glyphs.iter().find(|g| g.char_start == i).map(|g| g.gid);
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assert_eq!(gid_at(3), Some(face.glyph_for('l')), "mid-word char after a run boundary stays lower-case");
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assert_eq!(gid_at(6), Some(face.glyph_for('W')));
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}
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#[test]
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fn title_case_after_opening_apostrophe_on_canvas() {
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let Some(face) = inter() else { return };
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let glyph_chars = |s: &str, split: Option<usize>| {
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let mut t = TextData::new(s);
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t.style.case = figcraft_doc::TextCase::Title;
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if let Some(n) = split {
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t.restyle(0, n, |st| st.font_style = "Bold".into());
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}
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let l = layout(&t, None, None);
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let chars: Vec<char> = s.chars().collect();
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(0..chars.len()).map(|i| l.glyphs.iter().find(|g| g.char_start == i).map(|g| g.gid)).collect::<Vec<_>>()
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};
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let expect = |s: &str, want: &str| {
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let got: Vec<Option<u32>> = want.chars().map(|c| Some(face.glyph_for(c))).collect();
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for split in [None, Some(1), Some(2)] {
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assert_eq!(glyph_chars(s, split), got, "{s:?} split {split:?}");
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}
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};
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expect("'hello world'", "'Hello World'");
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expect("say 'hi'", "Say 'Hi'");
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expect("don't", "Don't");
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expect("\u{2019}hello", "\u{2019}Hello");
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}
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#[test]
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fn lists_hang_and_number() {
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if !have_fonts() {
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return;
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}
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let mut t = TextData::new("one two three four five six seven\nb");
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t.auto_resize = figcraft_doc::TextAutoResize::Height;
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t.list = figcraft_doc::ListStyle::Bulleted;
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t.paragraph_indent = 30.0;
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let l = layout(&t, Some(90.0), None);
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assert!(l.lines.len() >= 3);
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let first_text = |li: usize| {
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let ln = &l.lines[li];
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l.glyphs[ln.glyph_start..ln.glyph_end].iter().find(|g| g.char_end > g.char_start).map(|g| g.x).unwrap()
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};
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// Wrapped lines hang at the same x as the first line's text (paragraph indent is ignored in lists).
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assert!((first_text(0) - first_text(1)).abs() < 0.01);
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assert!(first_text(0) > 0.0);
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// The bullet sits left of the text, and carets never land on it.
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let ln = &l.lines[0];
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let marker = l.glyphs[ln.glyph_start..ln.glyph_end].iter().find(|g| g.char_end == g.char_start).unwrap();
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assert!(marker.x < first_text(0));
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assert!(l.caret(0).0 >= first_text(0) - 0.01);
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// Numbered: ten paragraphs, the text column clears "10.".
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let mut n = TextData::new((1..=10).map(|i| format!("p{i}")).collect::<Vec<_>>().join("\n"));
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n.list = figcraft_doc::ListStyle::Numbered;
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let l = layout(&n, None, None);
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assert_eq!(l.lines.len(), 10);
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let last = &l.lines[9];
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let gl = &l.glyphs[last.glyph_start..last.glyph_end];
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let marker_end = gl.iter().filter(|g| g.char_end == g.char_start).map(|g| g.x + g.advance).fold(0.0, f64::max);
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let text_x = gl.iter().find(|g| g.char_end > g.char_start).unwrap().x;
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assert!(marker_end < text_x, "{marker_end} < {text_x}");
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}
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#[test]
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fn paragraph_indent_first_line_only() {
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if !have_fonts() {
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return;
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}
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let mut t = TextData::new("aaa bbb ccc ddd eee fff ggg");
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t.auto_resize = figcraft_doc::TextAutoResize::Height;
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t.paragraph_indent = 20.0;
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let l = layout(&t, Some(70.0), None);
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assert!(l.lines.len() >= 2);
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let x0 = |li: usize| l.glyphs[l.lines[li].glyph_start].x;
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assert!((x0(0) - 20.0).abs() < 0.5, "{}", x0(0));
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assert!(x0(1) < 1.0);
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}
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#[test]
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fn truncate_max_lines_with_ellipsis() {
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let Some(face) = inter() else { return };
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let mut t = TextData::new("first line\nsecond line\nthird line");
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t.auto_resize = figcraft_doc::TextAutoResize::Truncate;
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t.max_lines = 2;
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let l = layout(&t, Some(300.0), Some(1000.0));
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assert!(l.truncated);
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assert_eq!(l.lines.len(), 2);
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let last = l.glyphs.last().unwrap();
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assert_eq!(last.gid, face.glyph_for('…'));
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// max_lines is ignored unless truncating.
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t.auto_resize = figcraft_doc::TextAutoResize::None;
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assert_eq!(layout(&t, Some(300.0), Some(1000.0)).lines.len(), 3);
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}
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#[test]
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fn vertical_alignment_in_fixed_box() {
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if !have_fonts() {
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return;
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}
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let mut t = TextData::new("Hi");
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t.auto_resize = figcraft_doc::TextAutoResize::None;
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t.align_v = figcraft_doc::TextAlignV::Bottom;
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let mut n = figcraft_doc::Node::new(figcraft_doc::NodeId(1), figcraft_doc::NodeKind::Text(t.clone()), "t", 100.0, 100.0);
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let (l, dy) = layout_node(&n).unwrap();
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assert!((dy + l.height - 100.0).abs() < 1e-6);
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t.align_v = figcraft_doc::TextAlignV::Middle;
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n.kind = figcraft_doc::NodeKind::Text(t.clone());
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let (l, dy) = layout_node(&n).unwrap();
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assert!((dy - (100.0 - l.height) / 2.0).abs() < 1e-6);
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// Auto height ignores vertical alignment.
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t.auto_resize = figcraft_doc::TextAutoResize::Height;
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n.kind = figcraft_doc::NodeKind::Text(t);
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assert_eq!(layout_node(&n).unwrap().1, 0.0);
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}
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/// A variable font with a usable weight axis, if one is installed (craft-fonts or the system).
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fn variable_face() -> Option<std::sync::Arc<Face>> {
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if !have_fonts() {
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return None;
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}
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scan_system_fonts();
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["Inter", "Bahnschrift", "Segoe UI Variable", "Roboto Flex", "Noto Sans", "Cantarell", "Source Sans 3", "Open Sans", "Roboto"]
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.into_iter()
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.filter_map(|fam| find_face(fam, "Regular").filter(|f| f.family.eq_ignore_ascii_case(fam)))
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.find(|f| f.axis("wght").is_some_and(|a| a.max - a.min >= 200.0))
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}
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#[test]
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fn variable_font_axes_change_shaping_and_outlines() {
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let Some(face) = variable_face() else {
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eprintln!("no variable font installed; skipping");
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return;
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};
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let wght = face.axis("wght").cloned().unwrap();
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let wi = face.axes.iter().position(|a| a.tag == "wght").unwrap();
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let mut t = TextData::new("Hamburgefonts");
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t.style.font_family = face.family.clone();
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t.style.font_style = face.style.clone();
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t.style.font_size = 40.0;
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t.style.variations.insert("wght".into(), wght.min);
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let light = layout(&t, None, None);
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t.style.variations.insert("wght".into(), wght.max);
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let heavy = layout(&t, None, None);
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assert!(heavy.glyphs.iter().filter(|g| g.face.id == face.id).all(|g| !g.coords.is_empty()), "glyphs carry the instance");
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let first = |l: &TextLayout| l.glyphs.first().map(|g| g.path().elements().to_vec());
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assert_ne!(first(&light), first(&heavy), "the weight axis changes the outlines");
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assert!(heavy.width >= light.width, "heavier is not narrower: {} < {}", heavy.width, light.width);
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// Values clamp to the axis; unknown axes and junk are ignored.
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t.style.variations.insert("wght".into(), 1e9);
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t.style.variations.insert("ZZZZ".into(), 5.0);
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t.style.variations.insert("wdth".into(), f64::NAN);
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let v = face.axis_values(&t.style);
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assert_eq!(v.len(), face.axes.len());
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assert_eq!(v.get(wi).copied(), Some(wght.max));
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assert!(v.iter().all(|x| x.is_finite()));
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let _ = layout(&t, None, None);
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// Without custom values, the style name implies the weight (or picks the named instance).
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t.style.variations.clear();
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t.style.font_style = "Bold".into();
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let v = face.axis_values(&t.style);
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let want = face.instance("Bold").and_then(|i| i.coords.get(wi).copied()).unwrap_or_else(|| wght.clamp(700.0));
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assert_eq!(v.get(wi).copied(), Some(want));
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// Named instances are offered as styles.
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if face.instances.len() > 1 {
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assert!(family_styles(&face.family).len() >= 2);
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}
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// The default instance needs no coordinates.
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assert!(face.coords(&face.axes.iter().map(|a| a.default).collect::<Vec<_>>()).is_empty());
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}
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#[test]
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fn static_fonts_have_no_axes() {
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if !have_fonts() {
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return;
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}
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let Some(face) = db().write().unwrap().default_face() else { return };
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if face.is_variable() {
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return;
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}
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let mut st = figcraft_doc::TextStyle::default();
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st.variations.insert("wght".into(), 900.0);
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assert!(face.axis_values(&st).is_empty());
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assert!(face.coords(&[700.0]).is_empty());
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}
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#[test]
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fn bidi_visual_order_follows_levels() {
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assert_eq!(crate::layout::visual_order(&[0, 0, 1, 1, 1, 0]), vec![0, 1, 4, 3, 2, 5]);
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// A left-to-right run inside a right-to-left paragraph keeps its order.
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assert_eq!(crate::layout::visual_order(&[1, 1, 2, 2, 1]), vec![4, 2, 3, 1, 0]);
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assert_eq!(crate::layout::visual_order(&[0, 0, 0]), vec![0, 1, 2]);
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assert!(crate::layout::visual_order(&[]).is_empty());
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// Plain left-to-right text skips the analysis.
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assert!(crate::layout::Bidi::of("Hello, world 123").is_none());
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let b = crate::layout::Bidi::of("abc \u{5D0}\u{5D1}\u{5D2}\n\u{5D3} x").unwrap();
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assert_eq!(b.levels.get(..4), Some(&[0, 0, 0, 0][..]));
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assert!(b.levels.get(4..7).unwrap().iter().all(|l| l % 2 == 1));
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// Paragraph direction comes from each paragraph's first strong char.
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assert!(!b.rtl_para[0] && b.rtl_para[8]);
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}
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/// The x of the glyph for char `i`.
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fn glyph_x(l: &TextLayout, i: usize) -> f64 {
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l.glyphs.iter().find(|g| g.char_start == i && g.char_end > i).map(|g| g.x).unwrap()
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}
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#[test]
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fn bidi_runs_lay_out_right_to_left() {
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if !have_fonts() {
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eprintln!("no fonts; skipping");
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return;
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}
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// Hebrew inside an English line: its first letter is right of its last.
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let mut t = TextData::new("abc \u{5D0}\u{5D1}\u{5D2}");
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t.style.font_size = 20.0;
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let l = layout(&t, None, None);
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assert!(!l.lines[0].rtl);
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assert!(glyph_x(&l, 2) < glyph_x(&l, 6), "Hebrew after the English");
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assert!(glyph_x(&l, 4) > glyph_x(&l, 6), "א right of ג");
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assert!(l.glyphs.iter().filter(|g| g.char_start >= 4).all(|g| g.rtl));
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// Glyphs are stored left to right and don't overlap.
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let xs: Vec<f64> = l.glyphs.iter().map(|g| g.x).collect();
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assert!(xs.windows(2).all(|w| w[0] <= w[1] + 1e-6), "{xs:?}");
|
||
|
||
// A Hebrew paragraph with English inside: English sits on the left, in reading order.
|
||
let t = TextData::new("\u{5D0}\u{5D1}\u{5D2} abc");
|
||
let l = layout(&t, None, None);
|
||
assert!(l.lines[0].rtl);
|
||
assert!(glyph_x(&l, 4) < glyph_x(&l, 5) && glyph_x(&l, 6) < glyph_x(&l, 2));
|
||
assert!(glyph_x(&l, 0) > glyph_x(&l, 2));
|
||
// The caret starts at the right and ends at the left; clicks map back.
|
||
let right = l.glyphs.iter().map(|g| g.x + g.advance).fold(0.0, f64::max);
|
||
assert!((l.caret(0).0 - right).abs() < 1e-6, "{} vs {right}", l.caret(0).0);
|
||
assert!(l.caret(7).0 < glyph_x(&l, 2));
|
||
assert_eq!(l.hit(right + 50.0, 5.0), 0);
|
||
assert_eq!(l.hit(-50.0, 5.0), 4, "left of the English run: before 'a'");
|
||
// Selecting the Hebrew word highlights its glyphs only.
|
||
let r = l.selection_rects(0, 3);
|
||
assert_eq!(r.len(), 1);
|
||
assert!(r[0].x0 >= glyph_x(&l, 2) - 1e-6 && r[0].x1 <= right + 1e-6 && r[0].x0 > glyph_x(&l, 6));
|
||
}
|
||
|
||
#[test]
|
||
fn arrows_move_visually_through_right_to_left_runs() {
|
||
if !have_fonts() {
|
||
eprintln!("no fonts; skipping");
|
||
return;
|
||
}
|
||
for text in ["abc \u{5D0}\u{5D1}\u{5D2} def", "\u{5D0}\u{5D1}\u{5D2} abc \u{5D3}\u{5D4}"] {
|
||
let l = layout(&TextData::new(text), None, None);
|
||
let n = text.chars().count();
|
||
// Start at the visual left edge and step right until the caret stops moving right.
|
||
let mut i = (0..=n).min_by(|a, b| l.caret(*a).0.total_cmp(&l.caret(*b).0)).unwrap();
|
||
let mut xs = vec![l.caret(i).0];
|
||
let mut seen = vec![i];
|
||
for _ in 0..(2 * n) {
|
||
let Some(j) = l.visual_step(i, true) else { panic!("bidi line steps visually") };
|
||
if j > n || l.caret(j.min(n)).0 <= *xs.last().unwrap() {
|
||
break;
|
||
}
|
||
i = j;
|
||
xs.push(l.caret(i).0);
|
||
seen.push(i);
|
||
}
|
||
assert!(xs.windows(2).all(|w| w[0] < w[1]), "{text}: {xs:?}");
|
||
assert!(seen.len() >= n - 1, "{text}: visited {seen:?}");
|
||
// And back.
|
||
let back = l.visual_step(i, false).unwrap();
|
||
assert!(l.caret(back).0 < l.caret(i).0);
|
||
}
|
||
// Plain left-to-right lines step by char (the caller's default).
|
||
assert!(layout(&TextData::new("plain"), None, None).visual_step(1, true).is_none());
|
||
}
|
||
|
||
#[test]
|
||
fn selection_through_text_end_stays_inside_auto_width_box() {
|
||
if !have_fonts() {
|
||
return;
|
||
}
|
||
for size in [12.0, 24.0, 96.0] {
|
||
let mut t = TextData::new("Hello world");
|
||
t.style.font_size = size;
|
||
let l = layout(&t, None, None);
|
||
let n = "Hello world".chars().count();
|
||
let right = l.selection_rects(0, n).last().map_or(f64::NAN, |r| r.x1);
|
||
assert!(right <= l.width.ceil(), "size {size}: right {right} > ceil(width) {}", l.width.ceil());
|
||
}
|
||
// A selected paragraph break still shows past the end of its line.
|
||
let t = TextData::new("Hello\nworld");
|
||
let l = layout(&t, None, None);
|
||
let r = l.selection_rects(0, 6);
|
||
let first = r.first().map_or(f64::NAN, |r| r.x1);
|
||
assert!(first > l.caret(5).0 + 1.0, "{first}");
|
||
}
|
||
|
||
/// The selection rect drawn on line `li` of `l`, if any.
|
||
fn rect_on(l: &TextLayout, rects: &[figcraft_geom::Rect], li: usize) -> Option<figcraft_geom::Rect> {
|
||
let top = l.lines.get(li)?.top;
|
||
rects.iter().find(|r| (r.y0 - top).abs() < 1e-6).copied()
|
||
}
|
||
|
||
#[test]
|
||
fn select_all_highlights_an_empty_last_line() {
|
||
if !have_fonts() {
|
||
return;
|
||
}
|
||
// "Hello\n": the trailing break leaves an empty second line (#665).
|
||
let l = layout(&TextData::new("Hello\n"), None, None);
|
||
assert_eq!(l.lines.len(), 2);
|
||
let Some(r) = rect_on(&l, &l.selection_rects(0, 6), 1) else { panic!("no highlight on the empty last line") };
|
||
// A paragraph-break mark at the line's start, not at the end of "Hello" above.
|
||
assert!(r.x0.abs() < 1e-6 && (r.width() - 4.0).abs() < 1e-6, "{r:?}");
|
||
assert!(rect_on(&l, &l.selection_rects(5, 6), 1).is_some());
|
||
// Selecting part of the first line, or a caret, leaves the empty line alone.
|
||
assert!(l.selection_rects(0, 1).iter().all(|r| r.y0 < l.lines[1].top - 1e-6), "{:?}", l.selection_rects(0, 1));
|
||
assert!(l.selection_rects(6, 6).is_empty());
|
||
// A right-to-left paragraph marks its empty last line too.
|
||
let rtl = layout(&TextData::new("\u{5E9}\u{5DC}\u{5D5}\u{5DD}\n"), None, None);
|
||
let Some(r) = rect_on(&rtl, &rtl.selection_rects(0, 5), 1) else { panic!("no highlight on the empty right-to-left line") };
|
||
assert!(r.x0.abs() < 1e-6 && (r.width() - 4.0).abs() < 1e-6, "{r:?}");
|
||
}
|
||
|
||
#[test]
|
||
fn selection_after_a_line_break_starts_at_the_line_start() {
|
||
if !have_fonts() {
|
||
return;
|
||
}
|
||
// Not at the end of the line above, where `caret` puts the index after the break.
|
||
let l = layout(&TextData::new("Hello\nworld"), None, None);
|
||
let Some(r) = rect_on(&l, &l.selection_rects(0, 11), 1) else { panic!("no highlight on the second line") };
|
||
assert!(r.x0.abs() < 1e-6 && r.x1 > l.caret(10).0, "{r:?}");
|
||
// An empty line in the middle shows its break mark at its start.
|
||
let m = layout(&TextData::new("Hello\n\nworld"), None, None);
|
||
let Some(r) = rect_on(&m, &m.selection_rects(0, 12), 1) else { panic!("no highlight on the empty line") };
|
||
assert!(r.x0.abs() < 1e-6 && (r.width() - 4.0).abs() < 1e-6, "{r:?}");
|
||
// A break followed by text still doesn't highlight the next line's start.
|
||
assert!(rect_on(&l, &l.selection_rects(0, 6), 1).is_none());
|
||
}
|
||
|
||
#[test]
|
||
fn the_caret_after_a_line_break_sits_on_the_next_line() {
|
||
if !have_fonts() {
|
||
return;
|
||
}
|
||
// Before the break: the end of its line; after it: the start of the next (after Enter, the
|
||
// caret shows on the new line, and Up/Down count from there).
|
||
let l = layout(&TextData::new("ab\ncd"), None, None);
|
||
assert_eq!(l.caret(2).1, 0);
|
||
assert!(l.caret(2).0 > 0.0);
|
||
assert_eq!(l.caret(3), (0.0, 1));
|
||
// A trailing break: the caret sits on the empty last line.
|
||
let l = layout(&TextData::new("ab\n"), None, None);
|
||
assert_eq!(l.caret(3), (0.0, 1));
|
||
}
|
||
|
||
#[test]
|
||
fn lower_case_writes_final_sigma() {
|
||
if !have_fonts() {
|
||
return;
|
||
}
|
||
let gids = |t: &TextData| layout(t, None, None).glyphs.iter().map(|g| (g.gid, g.char_start)).collect::<Vec<_>>();
|
||
let want = gids(&TextData::new("οδος ας"));
|
||
let Some(face) = layout(&TextData::new("ς"), None, None).glyphs.first().map(|g| g.face.clone()) else { return };
|
||
if face.glyph_for('σ') == face.glyph_for('ς') {
|
||
eprintln!("face has no distinct final sigma; skipping");
|
||
return;
|
||
}
|
||
let mut t = TextData::new("ΟΔΟΣ ΑΣ");
|
||
t.style.case = figcraft_doc::TextCase::Lower;
|
||
assert_eq!(gids(&t), want, "one run");
|
||
// The word split across two styled runs: the final form is still chosen from the whole text.
|
||
let mut other = t.style.clone();
|
||
other.font_size += 4.0;
|
||
t.runs.push(figcraft_doc::StyleRun { start: 3, end: 4, style: other });
|
||
assert_eq!(gids(&t).iter().map(|g| g.0).collect::<Vec<_>>(), want.iter().map(|g| g.0).collect::<Vec<_>>(), "split runs");
|
||
}
|
||
|
||
/// Thai is written without spaces between words; U+200B ZERO WIDTH SPACE marks where a line may
|
||
/// break. ภาษา|ไทย|เขียน|ติดกัน ("Thai is written joined up") ไม่มี|ช่องว่าง|ระหว่าง|คำ ("with no
|
||
/// spaces between words"), with one real space between the two phrases.
|
||
#[test]
|
||
fn justified_lines_dont_widen_zero_width_spaces() {
|
||
if !have_fonts() {
|
||
return;
|
||
}
|
||
let lay_out = |s: &str, align, w| {
|
||
let mut t = TextData::new(s);
|
||
t.style.font_size = 20.0;
|
||
t.align_h = align;
|
||
t.auto_resize = figcraft_doc::TextAutoResize::Height;
|
||
layout(&t, w, None)
|
||
};
|
||
let chars_before = |s: &str, pat: &str| s.find(pat).map(|b| s[..b].chars().count()).unwrap();
|
||
for (s, why) in [
|
||
("ภาษา\u{200B}ไทย\u{200B}เขียน\u{200B}ติดกัน ไม่มี\u{200B}ช่องว่าง\u{200B}ระหว่าง\u{200B}คำ", "the real space takes the extra room"),
|
||
("ภาษา\u{200B}ไทย\u{200B}เขียน\u{200B}ติดกัน\u{200B}ไม่มี\u{200B}ช่องว่าง\u{200B}ระหว่าง\u{200B}คำ", "no space to widen: as left-aligned"),
|
||
] {
|
||
// A box that ends inside ช่องว่าง: the first line breaks at the U+200B before it.
|
||
let word = chars_before(s, "ช่องว่าง");
|
||
let natural = lay_out(s, TextAlignH::Left, None);
|
||
let (a, b) = (natural.caret(word).0, natural.caret(word + 4).0);
|
||
assert!(b > a, "{why}: chars need advances");
|
||
let w = a + (b - a) / 2.0;
|
||
let left = lay_out(s, TextAlignH::Left, Some(w));
|
||
let just = lay_out(s, TextAlignH::Justified, Some(w));
|
||
assert!(just.lines.len() >= 2 && just.lines[0].char_end == word, "{why}: {:?}", just.lines);
|
||
let space = s.chars().position(|c| c == ' ');
|
||
let extra = w - left.lines[0].width;
|
||
assert!(extra > 0.0, "{why}");
|
||
assert_eq!(left.glyphs.len(), just.glyphs.len());
|
||
for (l, j) in left.glyphs.iter().zip(&just.glyphs).filter(|(g, _)| g.char_end <= word) {
|
||
let want = if space.is_some_and(|sp| l.char_start > sp) { extra } else { 0.0 };
|
||
assert!((j.x - l.x - want).abs() < 1e-6, "{why}: char {} moved {} (want {want})", l.char_start, j.x - l.x);
|
||
}
|
||
}
|
||
}
|