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= function xdiff_string_patch (originalStr, patch, flags, errorObj) { // eslint-disable-line camelcase\n // discuss at: http://locutus.io/php/xdiff_string_patch/\n // original by: Brett Zamir (http://brett-zamir.me)\n // improved by: Steven Levithan (stevenlevithan.com)\n // note 1: The XDIFF_PATCH_IGNORESPACE flag and the error argument are not\n // note 1: currently supported.\n // note 2: This has not been tested exhaustively yet.\n // note 3: The errorObj parameter (optional) if used must be passed in as a\n // note 3: object. The errors will then be written by reference into it's `value` property\n // example 1: xdiff_string_patch('', '@@ -0,0 +1,1 @@\\n+Hello world!')\n // returns 1: 'Hello world!'\n\n // First two functions were adapted from Steven Levithan, also under an MIT license\n // Adapted from XRegExp 1.5.0\n // (c) 2007-2010 Steven Levithan\n // MIT License\n // <http://xregexp.com>\n\n var _getNativeFlags = function (regex) {\n // Proposed for ES4; included in AS3\n return [\n (regex.global ? 'g' : ''),\n (regex.ignoreCase ? 'i' : ''),\n (regex.multiline ? 'm' : ''),\n (regex.extended ? 'x' : ''),\n (regex.sticky ? 'y' : '')\n ].join('')\n }\n\n var _cbSplit = function (string, sep) {\n // If separator `s` is not a regex, use the native `split`\n if (!(sep instanceof RegExp)) {\n // Had problems to get it to work here using prototype test\n return String.prototype.split.apply(string, arguments)\n }\n var str = String(string)\n var output = []\n var lastLastIndex = 0\n var match\n var lastLength\n var limit = Infinity\n var x = sep._xregexp\n // This is required if not `s.global`, and it avoids needing to set `s.lastIndex` to zero\n // and restore it to its original value when we're done using the regex\n // Brett paring down\n var s = new RegExp(sep.source, _getNativeFlags(sep) + 'g')\n if (x) {\n s._xregexp = {\n source: x.source,\n captureNames: x.captureNames ? x.captureNames.slice(0) : null\n }\n }\n\n while ((match = s.exec(str))) {\n // Run the altered `exec` (required for `lastIndex` fix, etc.)\n if (s.lastIndex > lastLastIndex) {\n output.push(str.slice(lastLastIndex, match.index))\n\n if (match.length > 1 && match.index < str.length) {\n Array.prototype.push.apply(output, match.slice(1))\n }\n\n lastLength = match[0].length\n lastLastIndex = s.lastIndex\n\n if (output.length >= limit) {\n break\n }\n }\n\n if (s.lastIndex === match.index) {\n s.lastIndex++\n }\n }\n\n if (lastLastIndex === str.length) {\n if (!s.test('') || lastLength) {\n output.push('')\n }\n } else {\n output.push(str.slice(lastLastIndex))\n }\n\n return output.length > limit ? output.slice(0, limit) : output\n }\n\n var i = 0\n var ll = 0\n var ranges = []\n var lastLinePos = 0\n var firstChar = ''\n var rangeExp = /^@@\\s+-(\\d+),(\\d+)\\s+\\+(\\d+),(\\d+)\\s+@@$/\n var lineBreaks = /\\r?\\n/\n var lines = _cbSplit(patch.replace(/(\\r?\\n)+$/, ''), lineBreaks)\n var origLines = _cbSplit(originalStr, lineBreaks)\n var newStrArr = []\n var linePos = 0\n var errors = ''\n var optTemp = 0 // Both string & integer (constant) input is allowed\n var OPTS = {\n // Unsure of actual PHP values, so better to rely on string\n 'XDIFF_PATCH_NORMAL': 1,\n 'XDIFF_PATCH_REVERSE': 2,\n 'XDIFF_PATCH_IGNORESPACE': 4\n }\n\n // Input defaulting & sanitation\n if (typeof originalStr !== 'string' || !patch) {\n return false\n }\n if (!flags) {\n flags = 'XDIFF_PATCH_NORMAL'\n }\n\n if (typeof flags !== 'number') {\n // Allow for a single string or an array of string flags\n flags = [].concat(flags)\n for (i = 0; i < flags.length; i++) {\n // Resolve string input to bitwise e.g. 'XDIFF_PATCH_NORMAL' becomes 1\n if (OPTS[flags[i]]) {\n optTemp = optTemp | OPTS[flags[i]]\n }\n }\n flags = optTemp\n }\n\n if (flags & OPTS.XDIFF_PATCH_NORMAL) {\n for (i = 0, ll = lines.length; i < ll; i++) {\n ranges = lines[i].match(rangeExp)\n if (ranges) {\n lastLinePos = linePos\n linePos = ranges[1] - 1\n while (lastLinePos < linePos) {\n newStrArr[newStrArr.length] = origLines[lastLinePos++]\n }\n while (lines[++i] && (rangeExp.exec(lines[i])) === null) {\n firstChar = lines[i].charAt(0)\n switch (firstChar) {\n case '-':\n // Skip including that line\n ++linePos\n break\n case '+':\n newStrArr[newStrArr.length] = lines[i].slice(1)\n break\n case ' ':\n newStrArr[newStrArr.length] = origLines[linePos++]\n break\n default:\n // Reconcile with returning errrors arg?\n throw new Error('Unrecognized initial character in unidiff line')\n }\n }\n if (lines[i]) {\n i--\n }\n }\n }\n while (linePos > 0 && linePos < origLines.length) {\n newStrArr[newStrArr.length] = origLines[linePos++]\n }\n } else if (flags & OPTS.XDIFF_PATCH_REVERSE) {\n // Only differs from above by a few lines\n for (i = 0, ll = lines.length; i < ll; i++) {\n ranges = lines[i].match(rangeExp)\n if (ranges) {\n lastLinePos = linePos\n linePos = ranges[3] - 1\n while (lastLinePos < linePos) {\n newStrArr[newStrArr.length] = origLines[lastLinePos++]\n }\n while (lines[++i] && (rangeExp.exec(lines[i])) === null) {\n firstChar = lines[i].charAt(0)\n switch (firstChar) {\n case '-':\n newStrArr[newStrArr.length] = lines[i].slice(1)\n break\n case '+':\n // Skip including that line\n ++linePos\n break\n case ' ':\n newStrArr[newStrArr.length] = origLines[linePos++]\n break\n default:\n // Reconcile with returning errrors arg?\n throw new Error('Unrecognized initial character in unidiff line')\n }\n }\n if (lines[i]) {\n i--\n }\n }\n }\n while (linePos > 0 && linePos < origLines.length) {\n newStrArr[newStrArr.length] = origLines[linePos++]\n }\n }\n\n if (errorObj) {\n errorObj.value = errors\n }\n\n return newStrArr.join('\\n')\n}\n"]}
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