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feat(text, fonts): UAX #9 BiDi and Arabic complex script typography engine (#4)

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* Sprint 1: bidi and Arabic typography engine

fonts: ISO 15924 script and a:latin/a:ea/a:cs slot classification;
shape_range shapes an item with the whole paragraph as HarfRust
pre/post context, explicit script/language/direction, glyphs kept in
visual order; per-grapheme-cluster fallback (slot face, theme script
font, OS cascade families, bundled craft-fonts face); GDEF ligature
carets.

text: UAX #9 levels for the whole paragraph (a:pPr/@rtl), itemization
by level, script, face and shaping style (paint-only changes no longer
split words), logical line breaking at cluster boundaries, per-line
L1/L2 reordering (L4 mirroring by the shaper); RTL start edge and
bullets, justLow kashida; caret Affinity, logical/visual movement,
bidi hit testing and selection as the union of visual boxes.

model/pptx: theme a:font script fonts and algn="justLow" round-trip.
engine: format.rtl (Right-to-Left Text Direction), justifyLow align.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Fonts: the bundled script face comes before installed fonts; no Microsoft family names

Arabic, Hebrew, Thai and Devanagari clusters try the craft-fonts face first, so every machine
draws the same, then openly licensed or OS-native installed families, then any installed face.
Installed Microsoft faces are still used through that scan, but not named (AGENTS.md §1.1).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Tayeb <tayeb@192.168.11.179>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
This commit is contained in:
hamzaelkachtaf4-star
2026-10-09 10:48:26 -04:00
committed by GitHub
co-authored by Claude Opus 5.5 Tayeb Brandon Thomas
parent 57545a99c8
commit 4b09f35c1d
20 changed files with 1904 additions and 284 deletions
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crates/engine/src/cmd/format.rs
+35 -1
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@@ -71,7 +71,24 @@ pub fn specs() -> Vec<CommandSpec> {
has_text_or_shapes,
text_outline
),
cmd!("format.align", "Align", ["Home", "Paragraph"], None, "{align: left|center|right|justify|distributed}", has_text_or_shapes, align),
cmd!(
"format.align",
"Align",
["Home", "Paragraph"],
None,
"{align: left|center|right|justify|justifyLow|distributed}",
has_text_or_shapes,
align
),
cmd!(
"format.rtl",
"Right-to-Left Text Direction",
["Home", "Paragraph"],
None,
"{on?: bool} (off = left-to-right; switching mirrors left/right alignment)",
has_text_or_shapes,
rtl
),
cmd!("format.alignLeft", "Align Left", ["Home", "Paragraph"], Some("Cmd+L"), "{}", has_text_or_shapes, |s, _| align_to(s, Align::Left)),
cmd!("format.alignCenter", "Center", ["Home", "Paragraph"], Some("Cmd+E"), "{}", has_text_or_shapes, |s, _| align_to(s, Align::Center)),
cmd!("format.alignRight", "Align Right", ["Home", "Paragraph"], Some("Cmd+R"), "{}", has_text_or_shapes, |s, _| align_to(s, Align::Right)),
@@ -367,12 +384,29 @@ fn align(s: &mut Session, p: &Value) -> Result<Value> {
"center" | "centre" | "ctr" => Align::Center,
"right" | "r" => Align::Right,
"justify" | "just" => Align::Justify,
"justifyLow" | "justLow" => Align::JustLow,
"distributed" | "dist" => Align::Distributed,
_ => Align::Left,
};
align_to(s, a)
}
/// Paragraph reading direction. Switching it mirrors left and right alignment, so text that sat
/// at the start edge stays there.
fn rtl(s: &mut Session, p: &Value) -> Result<Value> {
let on = on_param(p, current_para(s).rtl);
format_para(s, &move |para| {
if para.props.rtl.unwrap_or(false) != on {
para.props.align = match para.props.align {
None | Some(Align::Left) => Some(Align::Right),
Some(Align::Right) => Some(Align::Left),
other => other,
};
}
para.props.rtl = Some(on);
})
}
fn bullets(s: &mut Session, p: &Value) -> Result<Value> {
let cur = matches!(current_para(s).bullet, Some(Bullet::Char { .. }));
let on = on_param(p, Some(cur));