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* M4: a letter and its combining marks shape with one font (#1478) * M4: the stacked-mark test checks positions only in fonts whose anchors stack them (#1478) * M4: the cluster face rule is tested with stand-in faces, so it runs without system fonts (#1478) * M4: the #1478 tests use stand-in faces only, so they run everywhere
50 lines
2.4 KiB
Rust
50 lines
2.4 KiB
Rust
//! Vietnamese stacked diacritics (#1478): a letter and its marks are shaped with one face that has
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//! them all, whether written precomposed (NFC) or decomposed (NFD). The face rule is checked with
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//! stand-in faces, so it runs on any machine whatever fonts it has.
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use crate::layout::pick_cluster_face;
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/// A stand-in face: the chars it has glyphs for, and whether those are colour glyphs.
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struct Fake {
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chars: &'static str,
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color: bool,
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}
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const fn fake(chars: &'static str) -> Fake {
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Fake { chars, color: false }
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}
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fn pick<'a>(cluster: &str, primary: &'a Fake, emoji: &'a [Fake], fallbacks: &'a [Fake]) -> &'a str {
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let cl: Vec<char> = cluster.chars().collect();
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pick_cluster_face(&cl, primary, emoji, fallbacks, |f, c| f.chars.contains(c), |f| f.color).chars
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}
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#[test]
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fn a_cluster_takes_one_face_that_has_all_its_chars() {
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let latin = fake("EU");
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let full = [fake("EU\u{0302}\u{0309}\u{031B}\u{0301}")];
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let marks_only = [fake("\u{0302}\u{0309}"), fake("EU\u{0302}\u{0309}")];
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// The style's own face has the whole cluster: it keeps it.
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assert_eq!(pick("E\u{0302}\u{0309}", &full[0], &[], &[]), full[0].chars);
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// The style's face lacks a mark (Ể typed decomposed in a Latin-1 font): the first fallback with
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// the letter and every mark, not one with the marks alone.
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assert_eq!(pick("E\u{0302}\u{0309}", &latin, &[], &marks_only), "EU\u{0302}\u{0309}");
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// Joiners and variation selectors need no glyph of their own.
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assert_eq!(pick("E\u{200D}\u{FE0F}", &latin, &[], &full), "EU");
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// No face has the whole cluster: the letter's own face, then the first fallback with the letter.
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assert_eq!(pick("E\u{031B}\u{0303}", &latin, &[], &marks_only), "EU");
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assert_eq!(pick("Q\u{0302}", &fake("U"), &[], &[fake("\u{0302}"), fake("Q")]), "Q");
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assert_eq!(pick("Z\u{0302}", &latin, &[], &marks_only), "EU");
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// A line break stays with the style's face.
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assert_eq!(pick("\n", &latin, &[], &full), "EU");
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}
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#[test]
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fn an_emoji_takes_a_colour_face_unless_the_style_has_colour_glyphs() {
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let emoji = [Fake { chars: "\u{1F600}\u{1F601}", color: true }];
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let mono = fake("\u{1F600}");
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assert_eq!(pick("\u{1F600}", &mono, &emoji, &[]), emoji[0].chars);
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let colour = Fake { chars: "\u{1F600}", color: true };
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assert!(std::ptr::eq(pick_cluster_face(&['\u{1F600}'], &colour, &emoji, &[], |f, c| f.chars.contains(c), |f| f.color), &colour));
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}
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