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