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olf -
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Edit File: combinePrefixPatterns.js
/** * Given a group of {@link RegExp}s, returns a {@code RegExp} that globally * matches the union of the sets of strings matched by the input RegExp. * Since it matches globally, if the input strings have a start-of-input * anchor (/^.../), it is ignored for the purposes of unioning. * @param {Array.<RegExp>} regexs non multiline, non-global regexs. * @return {RegExp} a global regex. */ function combinePrefixPatterns(regexs) { var capturedGroupIndex = 0; var needToFoldCase = false; var ignoreCase = false; for (var i = 0, n = regexs.length; i < n; ++i) { var regex = regexs[i]; if (regex.ignoreCase) { ignoreCase = true; } else if (/[a-z]/i.test(regex.source.replace( /\\u[0-9a-f]{4}|\\x[0-9a-f]{2}|\\[^ux]/gi, ''))) { needToFoldCase = true; ignoreCase = false; break; } } var escapeCharToCodeUnit = { 'b': 8, 't': 9, 'n': 0xa, 'v': 0xb, 'f': 0xc, 'r': 0xd }; function decodeEscape(charsetPart) { var cc0 = charsetPart.charCodeAt(0); if (cc0 !== 92 /* \\ */) { return cc0; } var c1 = charsetPart.charAt(1); cc0 = escapeCharToCodeUnit[c1]; if (cc0) { return cc0; } else if ('0' <= c1 && c1 <= '7') { return parseInt(charsetPart.substring(1), 8); } else if (c1 === 'u' || c1 === 'x') { return parseInt(charsetPart.substring(2), 16); } else { return charsetPart.charCodeAt(1); } } function encodeEscape(charCode) { if (charCode < 0x20) { return (charCode < 0x10 ? '\\x0' : '\\x') + charCode.toString(16); } var ch = String.fromCharCode(charCode); return (ch === '\\' || ch === '-' || ch === ']' || ch === '^') ? "\\" + ch : ch; } function caseFoldCharset(charSet) { var charsetParts = charSet.substring(1, charSet.length - 1).match( new RegExp( '\\\\u[0-9A-Fa-f]{4}' + '|\\\\x[0-9A-Fa-f]{2}' + '|\\\\[0-3][0-7]{0,2}' + '|\\\\[0-7]{1,2}' + '|\\\\[\\s\\S]' + '|-' + '|[^-\\\\]', 'g')); var ranges = []; var inverse = charsetParts[0] === '^'; var out = ['[']; if (inverse) { out.push('^'); } for (var i = inverse ? 1 : 0, n = charsetParts.length; i < n; ++i) { var p = charsetParts[i]; if (/\\[bdsw]/i.test(p)) { // Don't muck with named groups. out.push(p); } else { var start = decodeEscape(p); var end; if (i + 2 < n && '-' === charsetParts[i + 1]) { end = decodeEscape(charsetParts[i + 2]); i += 2; } else { end = start; } ranges.push([start, end]); // If the range might intersect letters, then expand it. // This case handling is too simplistic. // It does not deal with non-latin case folding. // It works for latin source code identifiers though. if (!(end < 65 || start > 122)) { if (!(end < 65 || start > 90)) { ranges.push([Math.max(65, start) | 32, Math.min(end, 90) | 32]); } if (!(end < 97 || start > 122)) { ranges.push([Math.max(97, start) & ~32, Math.min(end, 122) & ~32]); } } } } // [[1, 10], [3, 4], [8, 12], [14, 14], [16, 16], [17, 17]] // -> [[1, 12], [14, 14], [16, 17]] ranges.sort(function (a, b) { return (a[0] - b[0]) || (b[1] - a[1]); }); var consolidatedRanges = []; var lastRange = []; for (var i = 0; i < ranges.length; ++i) { var range = ranges[i]; if (range[0] <= lastRange[1] + 1) { lastRange[1] = Math.max(lastRange[1], range[1]); } else { consolidatedRanges.push(lastRange = range); } } for (var i = 0; i < consolidatedRanges.length; ++i) { var range = consolidatedRanges[i]; out.push(encodeEscape(range[0])); if (range[1] > range[0]) { if (range[1] + 1 > range[0]) { out.push('-'); } out.push(encodeEscape(range[1])); } } out.push(']'); return out.join(''); } function allowAnywhereFoldCaseAndRenumberGroups(regex) { // Split into character sets, escape sequences, punctuation strings // like ('(', '(?:', ')', '^'), and runs of characters that do not // include any of the above. var parts = regex.source.match( new RegExp( '(?:' + '\\[(?:[^\\x5C\\x5D]|\\\\[\\s\\S])*\\]' // a character set + '|\\\\u[A-Fa-f0-9]{4}' // a unicode escape + '|\\\\x[A-Fa-f0-9]{2}' // a hex escape + '|\\\\[0-9]+' // a back-reference or octal escape + '|\\\\[^ux0-9]' // other escape sequence + '|\\(\\?[:!=]' // start of a non-capturing group + '|[\\(\\)\\^]' // start/end of a group, or line start + '|[^\\x5B\\x5C\\(\\)\\^]+' // run of other characters + ')', 'g')); var n = parts.length; // Maps captured group numbers to the number they will occupy in // the output or to -1 if that has not been determined, or to // undefined if they need not be capturing in the output. var capturedGroups = []; // Walk over and identify back references to build the capturedGroups // mapping. for (var i = 0, groupIndex = 0; i < n; ++i) { var p = parts[i]; if (p === '(') { // groups are 1-indexed, so max group index is count of '(' ++groupIndex; } else if ('\\' === p.charAt(0)) { var decimalValue = +p.substring(1); if (decimalValue) { if (decimalValue <= groupIndex) { capturedGroups[decimalValue] = -1; } else { // Replace with an unambiguous escape sequence so that // an octal escape sequence does not turn into a backreference // to a capturing group from an earlier regex. parts[i] = encodeEscape(decimalValue); } } } } // Renumber groups and reduce capturing groups to non-capturing groups // where possible. for (var i = 1; i < capturedGroups.length; ++i) { if (-1 === capturedGroups[i]) { capturedGroups[i] = ++capturedGroupIndex; } } for (var i = 0, groupIndex = 0; i < n; ++i) { var p = parts[i]; if (p === '(') { ++groupIndex; if (!capturedGroups[groupIndex]) { parts[i] = '(?:'; } } else if ('\\' === p.charAt(0)) { var decimalValue = +p.substring(1); if (decimalValue && decimalValue <= groupIndex) { parts[i] = '\\' + capturedGroups[decimalValue]; } } } // Remove any prefix anchors so that the output will match anywhere. // ^^ really does mean an anchored match though. for (var i = 0; i < n; ++i) { if ('^' === parts[i] && '^' !== parts[i + 1]) { parts[i] = ''; } } // Expand letters to groups to handle mixing of case-sensitive and // case-insensitive patterns if necessary. if (regex.ignoreCase && needToFoldCase) { for (var i = 0; i < n; ++i) { var p = parts[i]; var ch0 = p.charAt(0); if (p.length >= 2 && ch0 === '[') { parts[i] = caseFoldCharset(p); } else if (ch0 !== '\\') { // TODO: handle letters in numeric escapes. parts[i] = p.replace( /[a-zA-Z]/g, function (ch) { var cc = ch.charCodeAt(0); return '[' + String.fromCharCode(cc & ~32, cc | 32) + ']'; }); } } } return parts.join(''); } var rewritten = []; for (var i = 0, n = regexs.length; i < n; ++i) { var regex = regexs[i]; if (regex.global || regex.multiline) { throw new Error('' + regex); } rewritten.push( '(?:' + allowAnywhereFoldCaseAndRenumberGroups(regex) + ')'); } return new RegExp(rewritten.join('|'), ignoreCase ? 'gi' : 'g'); }
SavvyWolf - MANAGER