File size: 2,381 Bytes
15c3607 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 | import hljs from 'highlight.js';
import {
NEWLINE,
DEFAULT_LANGUAGE,
LANG_PATTERN,
AMPERSAND_REGEX,
LT_REGEX,
GT_REGEX,
FENCE_PATTERN
} from '$lib/constants';
export interface IncompleteCodeBlock {
language: string;
code: string;
openingIndex: number;
}
/**
* Highlights code using highlight.js
* @param code - The code to highlight
* @param language - The programming language
* @returns HTML string with syntax highlighting
*/
export function highlightCode(code: string, language: string): string {
if (!code) return '';
try {
const lang = language.toLowerCase();
const isSupported = hljs.getLanguage(lang);
if (isSupported) {
return hljs.highlight(code, { language: lang }).value;
} else {
return hljs.highlightAuto(code).value;
}
} catch {
// Fallback to escaped plain text
return code
.replace(AMPERSAND_REGEX, '&')
.replace(LT_REGEX, '<')
.replace(GT_REGEX, '>');
}
}
/**
* Detects if markdown ends with an incomplete code block (opened but not closed).
* Returns the code block info if found, null otherwise.
* @param markdown - The raw markdown string to check
* @returns IncompleteCodeBlock info or null
*/
export function detectIncompleteCodeBlock(markdown: string): IncompleteCodeBlock | null {
// Count all code fences in the markdown
// A code block is incomplete if there's an odd number of ``` fences
const fencePattern = new RegExp(FENCE_PATTERN.source, FENCE_PATTERN.flags);
const fences: number[] = [];
let fenceMatch;
while ((fenceMatch = fencePattern.exec(markdown)) !== null) {
// Store the position after the ```
const pos = fenceMatch[0].startsWith(NEWLINE) ? fenceMatch.index + 1 : fenceMatch.index;
fences.push(pos);
}
// If even number of fences (including 0), all code blocks are closed
if (fences.length % 2 === 0) {
return null;
}
// Odd number means last code block is incomplete
// The last fence is the opening of the incomplete block
const openingIndex = fences[fences.length - 1];
const afterOpening = markdown.slice(openingIndex + 3);
// Extract language and code content
const langMatch = afterOpening.match(LANG_PATTERN);
const language = langMatch?.[1] || DEFAULT_LANGUAGE;
const codeStartIndex = openingIndex + 3 + (langMatch?.[0]?.length ?? 0);
const code = markdown.slice(codeStartIndex);
return {
language,
code,
openingIndex
};
}
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