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feat: integrate syntax highlighting into render pipeline

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- src/render.rs: Rewrite with event-based pulldown-cmark parsing.
  Intercepts CodeBlock events and applies tree-sitter highlighting.
  4 new tests covering highlighted and unhighlighted code blocks.

- src/highlight.rs: Fix HtmlRenderer callback to return attributes
  only (not full span tags). Static HTML_ATTRS array for zero-alloc.

- static/style.css: Add 20 hl-* CSS classes with CSS variables.
  Light and dark mode via prefers-color-scheme.

Supported languages: rust, bash, json. Phase 2 complete.
This commit is contained in:
Timothy DeHerrera
2026-01-24 20:47:31 -07:00
parent ba5e97dfb7
commit c145bf86b9
4 changed files with 381 additions and 38 deletions
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45
src/highlight.rs
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@@ -29,27 +29,28 @@ const HIGHLIGHT_NAMES: &[&str] = &[
/// Static HTML attributes for each highlight class.
/// Pre-computed to avoid allocations in the render loop.
/// HtmlRenderer wraps with <span ...>...</span>, callback returns just the attributes.
const HTML_ATTRS: &[&[u8]] = &[
b"<span class=\"hl-attribute\">",
b"<span class=\"hl-comment\">",
b"<span class=\"hl-constant\">",
b"<span class=\"hl-constant-builtin\">",
b"<span class=\"hl-constructor\">",
b"<span class=\"hl-function\">",
b"<span class=\"hl-function-builtin\">",
b"<span class=\"hl-keyword\">",
b"<span class=\"hl-number\">",
b"<span class=\"hl-operator\">",
b"<span class=\"hl-property\">",
b"<span class=\"hl-punctuation\">",
b"<span class=\"hl-punctuation-bracket\">",
b"<span class=\"hl-punctuation-delimiter\">",
b"<span class=\"hl-string\">",
b"<span class=\"hl-type\">",
b"<span class=\"hl-type-builtin\">",
b"<span class=\"hl-variable\">",
b"<span class=\"hl-variable-builtin\">",
b"<span class=\"hl-variable-parameter\">",
b" class=\"hl-attribute\"",
b" class=\"hl-comment\"",
b" class=\"hl-constant\"",
b" class=\"hl-constant-builtin\"",
b" class=\"hl-constructor\"",
b" class=\"hl-function\"",
b" class=\"hl-function-builtin\"",
b" class=\"hl-keyword\"",
b" class=\"hl-number\"",
b" class=\"hl-operator\"",
b" class=\"hl-property\"",
b" class=\"hl-punctuation\"",
b" class=\"hl-punctuation-bracket\"",
b" class=\"hl-punctuation-delimiter\"",
b" class=\"hl-string\"",
b" class=\"hl-type\"",
b" class=\"hl-type-builtin\"",
b" class=\"hl-variable\"",
b" class=\"hl-variable-builtin\"",
b" class=\"hl-variable-parameter\"",
];
/// Supported languages for syntax highlighting.
@@ -147,7 +148,7 @@ mod tests {
let html = highlight_code(Language::Rust, code);
// Should contain span elements with highlight classes
assert!(html.contains("<span class=\"hl-"));
assert!(html.contains("class=\"hl-"));
// Should contain the keyword "fn"
assert!(html.contains("fn"));
// Should contain the string
@@ -159,7 +160,7 @@ mod tests {
let code = "#!/bin/bash\necho \"hello world\"";
let html = highlight_code(Language::Bash, code);
assert!(html.contains("<span class=\"hl-"));
assert!(html.contains("class=\"hl-"));
assert!(html.contains("echo"));
}