2020-12-07 15:52:01 +00:00
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import MultiRegexp from 'multi-regexp2'
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2020-12-07 15:39:44 +00:00
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export function createMultiRegexp(regexString: string) {
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let insideCharClass = false
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let captureGroupIndex = -1
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for (let i = 0; i < regexString.length; i++) {
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if (
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!insideCharClass &&
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regexString[i] === '[' &&
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regexString[i - 1] !== '\\'
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) {
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insideCharClass = true
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} else if (
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insideCharClass &&
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regexString[i] === ']' &&
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regexString[i - 1] !== '\\'
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) {
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insideCharClass = false
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} else if (
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!insideCharClass &&
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regexString[i] === '(' &&
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regexString.substr(i + 1, 2) !== '?:'
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) {
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captureGroupIndex = i
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break
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}
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}
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const re = /(?:[^\\]|^)\(\?:/g
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let match: RegExpExecArray
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let nonCaptureGroupIndexes: number[] = []
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while ((match = re.exec(regexString)) !== null) {
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if (match[0].startsWith('(')) {
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nonCaptureGroupIndexes.push(match.index)
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} else {
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nonCaptureGroupIndexes.push(match.index + 1)
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}
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}
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const regex = new MultiRegexp(
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new RegExp(
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regexString.replace(re, (m) => m.substr(0, m.length - 2)),
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'g'
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)
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)
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let groupIndex =
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1 + nonCaptureGroupIndexes.filter((i) => i < captureGroupIndex).length
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return {
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exec: (str: string) => {
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return regex.execForGroup(str, groupIndex)
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},
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}
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}
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