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feat: enhance c++ syntax highlighting with attribute support #562

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Merged
julioest merged 1 commit into from
Dec 15, 2025
Merged

feat: enhance c++ syntax highlighting with attribute support #562

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9 changes: 7 additions & 2 deletions antora-ui/src/css/cpp-highlight.css
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Original file line number Diff line number Diff line change
Expand Up @@ -3,11 +3,10 @@
* This replaces highlight.js's C++ highlighting for consistent styling
*/

/* C++ Keywords - blue, bold */
/* C++ Keywords - blue */
code.cpp-highlight .cpp-keyword,
.doc pre.highlight code.cpp-highlight .cpp-keyword {
color: #00f;
font-weight: bold;
}

/* C++ Strings - dark red */
Expand All @@ -29,6 +28,12 @@ code.cpp-highlight .cpp-comment,
font-style: italic;
}

/* C++ Attributes - gray */
code.cpp-highlight .cpp-attribute,
.doc pre.highlight code.cpp-highlight .cpp-attribute {
color: #9e9e9e;
}

/* Base text in C++ blocks - plain black (identifiers, function names, etc.) */
code.cpp-highlight,
.doc pre.highlight code.cpp-highlight {
Expand Down
21 changes: 21 additions & 0 deletions antora-ui/src/js/vendor/cpp-highlight.js
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@
* - string : String and character literals
* - preprocessor: Preprocessor directives (#include, #define, etc.)
* - comment : C and C++ style comments
* - attribute : C++ attributes ([[nodiscard]], [[noreturn]], etc.)
*/

const CppHighlight = (function () {
Expand Down Expand Up @@ -59,6 +60,26 @@ const CppHighlight = (function () {
const n = code.length

while (i < n) {
// C++ attributes [[...]] with nesting support
if (code[i] === '[' && code[i + 1] === '[') {
const start = i
i += 2
let depth = 1
while (i < n && depth > 0) {
if (code[i] === '[' && code[i + 1] === '[') {
depth++
i += 2
} else if (code[i] === ']' && code[i + 1] === ']') {
depth--
i += 2
} else {
i++
}
}
result.push(span('attribute', code.slice(start, i)))
continue
}

// Line comment
if (code[i] === '/' && code[i + 1] === '/') {
let end = i + 2
Expand Down
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