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1"use strict";2Object.defineProperty(exports, "__esModule", { value: true });3exports.parsePatch = parsePatch;4/**5 * Parses a patch into structured data, in the same structure returned by `structuredPatch`.6 *7 * @return a JSON object representation of the a patch, suitable for use with the `applyPatch` method.8 */9function parsePatch(uniDiff) {10    var diffstr = uniDiff.split(/\n/), list = [];11    var i = 0;12    function parseIndex() {13        var index = {};14        list.push(index);15        // Parse diff metadata16        while (i < diffstr.length) {17            var line = diffstr[i];18            // File header found, end parsing diff metadata19            if ((/^(---|\+\+\+|@@)\s/).test(line)) {20                break;21            }22            // Try to parse the line as a diff header, like23            //     Index: README.md24            // or25            //     diff -r 9117c6561b0b -r 273ce12ad8f1 .hgignore26            // or27            //     Index: something with multiple words28            // and extract the filename (or whatever else is used as an index name)29            // from the end (i.e. 'README.md', '.hgignore', or30            // 'something with multiple words' in the examples above).31            //32            // TODO: It seems awkward that we indiscriminately trim off trailing33            //       whitespace here. Theoretically, couldn't that be meaningful -34            //       e.g. if the patch represents a diff of a file whose name ends35            //       with a space? Seems wrong to nuke it.36            //       But this behaviour has been around since v2.2.1 in 2015, so if37            //       it's going to change, it should be done cautiously and in a new38            //       major release, for backwards-compat reasons.39            //       -- ExplodingCabbage40            var headerMatch = (/^(?:Index:|diff(?: -r \w+)+)\s+/).exec(line);41            if (headerMatch) {42                index.index = line.substring(headerMatch[0].length).trim();43            }44            i++;45        }46        // Parse file headers if they are defined. Unified diff requires them, but47        // there's no technical issues to have an isolated hunk without file header48        parseFileHeader(index);49        parseFileHeader(index);50        // Parse hunks51        index.hunks = [];52        while (i < diffstr.length) {53            var line = diffstr[i];54            if ((/^(Index:\s|diff\s|---\s|\+\+\+\s|===================================================================)/).test(line)) {55                break;56            }57            else if ((/^@@/).test(line)) {58                index.hunks.push(parseHunk());59            }60            else if (line) {61                throw new Error('Unknown line ' + (i + 1) + ' ' + JSON.stringify(line));62            }63            else {64                i++;65            }66        }67    }68    // Parses the --- and +++ headers, if none are found, no lines69    // are consumed.70    function parseFileHeader(index) {71        var fileHeaderMatch = (/^(---|\+\+\+)\s+/).exec(diffstr[i]);72        if (fileHeaderMatch) {73            var prefix = fileHeaderMatch[1], data = diffstr[i].substring(3).trim().split('\t', 2), header = (data[1] || '').trim();74            var fileName = data[0].replace(/\\\\/g, '\\');75            if (fileName.startsWith('"') && fileName.endsWith('"')) {76                fileName = fileName.substr(1, fileName.length - 2);77            }78            if (prefix === '---') {79                index.oldFileName = fileName;80                index.oldHeader = header;81            }82            else {83                index.newFileName = fileName;84                index.newHeader = header;85            }86            i++;87        }88    }89    // Parses a hunk90    // This assumes that we are at the start of a hunk.91    function parseHunk() {92        var _a;93        var chunkHeaderIndex = i, chunkHeaderLine = diffstr[i++], chunkHeader = chunkHeaderLine.split(/@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@/);94        var hunk = {95            oldStart: +chunkHeader[1],96            oldLines: typeof chunkHeader[2] === 'undefined' ? 1 : +chunkHeader[2],97            newStart: +chunkHeader[3],98            newLines: typeof chunkHeader[4] === 'undefined' ? 1 : +chunkHeader[4],99            lines: []100        };101        // Unified Diff Format quirk: If the chunk size is 0,102        // the first number is one lower than one would expect.103        // https://www.artima.com/weblogs/viewpost.jsp?thread=164293104        if (hunk.oldLines === 0) {105            hunk.oldStart += 1;106        }107        if (hunk.newLines === 0) {108            hunk.newStart += 1;109        }110        var addCount = 0, removeCount = 0;111        for (; i < diffstr.length && (removeCount < hunk.oldLines || addCount < hunk.newLines || ((_a = diffstr[i]) === null || _a === void 0 ? void 0 : _a.startsWith('\\'))); i++) {112            var operation = (diffstr[i].length == 0 && i != (diffstr.length - 1)) ? ' ' : diffstr[i][0];113            if (operation === '+' || operation === '-' || operation === ' ' || operation === '\\') {114                hunk.lines.push(diffstr[i]);115                if (operation === '+') {116                    addCount++;117                }118                else if (operation === '-') {119                    removeCount++;120                }121                else if (operation === ' ') {122                    addCount++;123                    removeCount++;124                }125            }126            else {127                throw new Error("Hunk at line ".concat(chunkHeaderIndex + 1, " contained invalid line ").concat(diffstr[i]));128            }129        }130        // Handle the empty block count case131        if (!addCount && hunk.newLines === 1) {132            hunk.newLines = 0;133        }134        if (!removeCount && hunk.oldLines === 1) {135            hunk.oldLines = 0;136        }137        // Perform sanity checking138        if (addCount !== hunk.newLines) {139            throw new Error('Added line count did not match for hunk at line ' + (chunkHeaderIndex + 1));140        }141        if (removeCount !== hunk.oldLines) {142            throw new Error('Removed line count did not match for hunk at line ' + (chunkHeaderIndex + 1));143        }144        return hunk;145    }146    while (i < diffstr.length) {147        parseIndex();148    }149    return list;150}151