remove line highlight

Author: dks333

packages/mdx/src/plugins/rehype/rehypeSyntaxHighlighting.ts

@@ -18,12 +18,7 @@ import {
   DEFAULT_THEMES,
   DEFAULT_LANGS,
 } from './shiki-constants.js';
-import {
-  getLanguage,
-  getLinesToHighlight,
-  lineHighlightPattern,
-  LINE_HIGHLIGHT_CLASS,
-} from './utils.js';
+import { getLanguage } from './utils.js';
 
 export type RehypeSyntaxHighlightingOptions = {
   theme?: ShikiTheme;
@@ -118,8 +113,6 @@ const traverseNode = (
 ) => {
   try {
     const code = toString(node);
-    const lines = code.split('\n');
-    let linesToHighlight = getLinesToHighlight(node, lines.length);
 
     const hast = highlighter.codeToHast(code, {
       lang: lang ?? DEFAULT_LANG,
@@ -139,28 +132,6 @@ const traverseNode = (
     if (!codeElement) return;
 
     let lineNumber = 0;
-    visit(codeElement, 'element', (span, spanIndex, spanParent) => {
-      if (
-        !spanParent ||
-        spanParent.type !== 'element' ||
-        spanParent.tagName !== 'code' ||
-        span.tagName !== 'span' ||
-        (!span.children.length && spanIndex === spanParent.children.length - 1) ||
-        (typeof span.properties.class !== 'string' && !Array.isArray(span.properties.class)) ||
-        !span.properties.class.includes('line')
-      ) {
-        return;
-      }
-
-      lineNumber++;
-      if (linesToHighlight.includes(lineNumber)) {
-        if (typeof span.properties.class === 'string') {
-          span.properties.class += ' ' + LINE_HIGHLIGHT_CLASS;
-        } else {
-          span.properties.class = [...span.properties.class, LINE_HIGHLIGHT_CLASS];
-        }
-      }
-    });
 
     const preChild = codeElement.children[0] as Element;
     const numberOfLines = lineNumber;

packages/mdx/src/plugins/rehype/utils.ts

@@ -2,9 +2,6 @@ import type { Element } from 'hast';
 
 import { type ShikiLang } from './shiki-constants.js';
 
-export const lineHighlightPattern = /\{(.*?)\}/;
-export const LINE_HIGHLIGHT_CLASS = 'line-highlight';
-
 export function classNameOrEmptyArray(element: Element): string[] {
   const className = element.properties.className;
   if (Array.isArray(className) && className.every((el) => typeof el === 'string')) return className;
@@ -26,36 +23,3 @@ export function getLanguage(
 
   return undefined;
 }
-
-export function getLinesToHighlight(node: Element, maxLines: number): number[] {
-  const meta =
-    typeof node.data?.meta === 'string'
-      ? node.data.meta
-      : classNameOrEmptyArray(node).reduce((acc, item) => acc + ' ' + item, '');
-  if (!meta) return [];
-
-  const content = meta.match(lineHighlightPattern)?.[1]?.trim();
-  if (!content) return [];
-
-  const lineNumbers = new Set<number>();
-
-  content.split(',').forEach((part) => {
-    const [start, end] = part.split('-').map((num) => {
-      const trimmed = num.trim();
-      if (!/^\d+$/.test(trimmed)) return undefined;
-      const parsed = parseInt(trimmed, 10);
-      return parsed > maxLines ? maxLines : parsed;
-    });
-
-    if (!start) return;
-    const endLine = end ?? start;
-
-    if (endLine < start) return;
-    const max = Math.min(endLine, maxLines);
-    for (let i = start; i <= max; i++) {
-      lineNumbers.add(i);
-    }
-  });
-
-  return Array.from(lineNumbers).sort((a, b) => a - b);
-}