168 lines
18 KiB
JavaScript
168 lines
18 KiB
JavaScript
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/*istanbul ignore start*/
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.parsePatch = parsePatch;
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/*istanbul ignore end*/
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function parsePatch(uniDiff) {
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/*istanbul ignore start*/
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var
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/*istanbul ignore end*/
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options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
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var diffstr = uniDiff.split(/\r\n|[\n\v\f\r\x85]/),
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delimiters = uniDiff.match(/\r\n|[\n\v\f\r\x85]/g) || [],
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list = [],
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i = 0;
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function parseIndex() {
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var index = {};
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list.push(index); // Parse diff metadata
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while (i < diffstr.length) {
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var line = diffstr[i]; // File header found, end parsing diff metadata
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if (/^(\-\-\-|\+\+\+|@@)\s/.test(line)) {
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break;
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} // Diff index
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var header = /^(?:Index:|diff(?: -r \w+)+)\s+(.+?)\s*$/.exec(line);
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if (header) {
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index.index = header[1];
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}
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i++;
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} // Parse file headers if they are defined. Unified diff requires them, but
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// there's no technical issues to have an isolated hunk without file header
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parseFileHeader(index);
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parseFileHeader(index); // Parse hunks
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index.hunks = [];
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while (i < diffstr.length) {
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var _line = diffstr[i];
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if (/^(Index:|diff|\-\-\-|\+\+\+)\s/.test(_line)) {
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break;
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} else if (/^@@/.test(_line)) {
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index.hunks.push(parseHunk());
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} else if (_line && options.strict) {
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// Ignore unexpected content unless in strict mode
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throw new Error('Unknown line ' + (i + 1) + ' ' + JSON.stringify(_line));
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} else {
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i++;
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}
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}
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} // Parses the --- and +++ headers, if none are found, no lines
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// are consumed.
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function parseFileHeader(index) {
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var fileHeader = /^(---|\+\+\+)\s+(.*)$/.exec(diffstr[i]);
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if (fileHeader) {
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var keyPrefix = fileHeader[1] === '---' ? 'old' : 'new';
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var data = fileHeader[2].split('\t', 2);
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var fileName = data[0].replace(/\\\\/g, '\\');
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if (/^".*"$/.test(fileName)) {
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fileName = fileName.substr(1, fileName.length - 2);
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}
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index[keyPrefix + 'FileName'] = fileName;
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index[keyPrefix + 'Header'] = (data[1] || '').trim();
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i++;
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}
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} // Parses a hunk
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// This assumes that we are at the start of a hunk.
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function parseHunk() {
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var chunkHeaderIndex = i,
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chunkHeaderLine = diffstr[i++],
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chunkHeader = chunkHeaderLine.split(/@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@/);
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var hunk = {
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oldStart: +chunkHeader[1],
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oldLines: typeof chunkHeader[2] === 'undefined' ? 1 : +chunkHeader[2],
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newStart: +chunkHeader[3],
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newLines: typeof chunkHeader[4] === 'undefined' ? 1 : +chunkHeader[4],
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lines: [],
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linedelimiters: []
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}; // Unified Diff Format quirk: If the chunk size is 0,
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// the first number is one lower than one would expect.
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// https://www.artima.com/weblogs/viewpost.jsp?thread=164293
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if (hunk.oldLines === 0) {
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hunk.oldStart += 1;
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}
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if (hunk.newLines === 0) {
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hunk.newStart += 1;
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}
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var addCount = 0,
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removeCount = 0;
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for (; i < diffstr.length; i++) {
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// Lines starting with '---' could be mistaken for the "remove line" operation
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// But they could be the header for the next file. Therefore prune such cases out.
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if (diffstr[i].indexOf('--- ') === 0 && i + 2 < diffstr.length && diffstr[i + 1].indexOf('+++ ') === 0 && diffstr[i + 2].indexOf('@@') === 0) {
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break;
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}
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var operation = diffstr[i].length == 0 && i != diffstr.length - 1 ? ' ' : diffstr[i][0];
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if (operation === '+' || operation === '-' || operation === ' ' || operation === '\\') {
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hunk.lines.push(diffstr[i]);
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hunk.linedelimiters.push(delimiters[i] || '\n');
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if (operation === '+') {
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addCount++;
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} else if (operation === '-') {
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removeCount++;
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} else if (operation === ' ') {
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addCount++;
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removeCount++;
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}
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} else {
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break;
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}
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} // Handle the empty block count case
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if (!addCount && hunk.newLines === 1) {
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hunk.newLines = 0;
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}
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if (!removeCount && hunk.oldLines === 1) {
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hunk.oldLines = 0;
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} // Perform optional sanity checking
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if (options.strict) {
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if (addCount !== hunk.newLines) {
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throw new Error('Added line count did not match for hunk at line ' + (chunkHeaderIndex + 1));
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}
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if (removeCount !== hunk.oldLines) {
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throw new Error('Removed line count did not match for hunk at line ' + (chunkHeaderIndex + 1));
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}
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}
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return hunk;
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}
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while (i < diffstr.length) {
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parseIndex();
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}
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return list;
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}
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