63 lines
1.8 KiB
JavaScript
63 lines
1.8 KiB
JavaScript
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// Header matching code by CodeMirror, copyright (c) by Marijn Haverbeke and others
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// Distributed under an MIT license: https://codemirror.net/LICENSE
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import CodeMirror from 'codemirror'
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const maxDepth = 100
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const codeBlockStartMatch = /^`{3}[a-zA-Z0-9]+$/
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const codeBlockEndMatch = /^`{3}$/
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CodeMirror.registerHelper('fold', 'markdown', function (cm, start) {
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const firstLine = cm.getLine(start.line)
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const lastLineNo = cm.lastLine()
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let end
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function isHeader(lineNo) {
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const tokentype = cm.getTokenTypeAt(CodeMirror.Pos(lineNo, 0))
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return tokentype && /\bheader\b/.test(tokentype)
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}
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function headerLevel(lineNo, line, nextLine) {
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let match = line && line.match(/^#+/)
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if (match && isHeader(lineNo)) return match[0].length
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match = nextLine && nextLine.match(/^[=-]+\s*$/)
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if (match && isHeader(lineNo + 1)) return nextLine[0] === '=' ? 1 : 2
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return maxDepth
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}
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// -> CODE BLOCK
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if (codeBlockStartMatch.test(cm.getLine(start.line))) {
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end = start.line
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let nextNextLine = cm.getLine(end + 1)
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while (end < lastLineNo) {
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if (codeBlockEndMatch.test(nextNextLine)) {
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end++
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break
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}
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end++
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nextNextLine = cm.getLine(end + 1)
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}
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} else {
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// -> HEADER
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let nextLine = cm.getLine(start.line + 1)
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const level = headerLevel(start.line, firstLine, nextLine)
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if (level === maxDepth) return undefined
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end = start.line
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let nextNextLine = cm.getLine(end + 2)
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while (end < lastLineNo) {
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if (headerLevel(end + 1, nextLine, nextNextLine) <= level) break
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++end
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nextLine = nextNextLine
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nextNextLine = cm.getLine(end + 2)
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}
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}
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return {
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from: CodeMirror.Pos(start.line, firstLine.length),
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to: CodeMirror.Pos(end, cm.getLine(end).length)
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}
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})
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