@circuitly/diff
Version:
A javascript text diff implementation.
247 lines (233 loc) • 33.7 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.applyPatch = applyPatch;
exports.applyPatches = applyPatches;
var _string = require("../util/string");
var _lineEndings = require("./line-endings");
var _parse = require("./parse");
var _distanceIterator = _interopRequireDefault(require("../util/distance-iterator"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { "default": e }; }
function applyPatch(source, uniDiff) {
var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
if (typeof uniDiff === 'string') {
uniDiff = (0, _parse.parsePatch)(uniDiff);
}
if (Array.isArray(uniDiff)) {
if (uniDiff.length > 1) {
throw new Error('applyPatch only works with a single input.');
}
uniDiff = uniDiff[0];
}
if (options.autoConvertLineEndings || options.autoConvertLineEndings == null) {
if ((0, _string.hasOnlyWinLineEndings)(source) && (0, _lineEndings.isUnix)(uniDiff)) {
uniDiff = (0, _lineEndings.unixToWin)(uniDiff);
} else if ((0, _string.hasOnlyUnixLineEndings)(source) && (0, _lineEndings.isWin)(uniDiff)) {
uniDiff = (0, _lineEndings.winToUnix)(uniDiff);
}
}
// Apply the diff to the input
var lines = source.split('\n'),
hunks = uniDiff.hunks,
compareLine = options.compareLine || function (lineNumber, line, operation, patchContent) {
return line === patchContent;
},
fuzzFactor = options.fuzzFactor || 0,
minLine = 0;
if (fuzzFactor < 0 || !Number.isInteger(fuzzFactor)) {
throw new Error('fuzzFactor must be a non-negative integer');
}
// Special case for empty patch.
if (!hunks.length) {
return source;
}
// Before anything else, handle EOFNL insertion/removal. If the patch tells us to make a change
// to the EOFNL that is redundant/impossible - i.e. to remove a newline that's not there, or add a
// newline that already exists - then we either return false and fail to apply the patch (if
// fuzzFactor is 0) or simply ignore the problem and do nothing (if fuzzFactor is >0).
// If we do need to remove/add a newline at EOF, this will always be in the final hunk:
var prevLine = '',
removeEOFNL = false,
addEOFNL = false;
for (var i = 0; i < hunks[hunks.length - 1].lines.length; i++) {
var line = hunks[hunks.length - 1].lines[i];
if (line[0] == '\\') {
if (prevLine[0] == '+') {
removeEOFNL = true;
} else if (prevLine[0] == '-') {
addEOFNL = true;
}
}
prevLine = line;
}
if (removeEOFNL) {
if (addEOFNL) {
// This means the final line gets changed but doesn't have a trailing newline in either the
// original or patched version. In that case, we do nothing if fuzzFactor > 0, and if
// fuzzFactor is 0, we simply validate that the source file has no trailing newline.
if (!fuzzFactor && lines[lines.length - 1] == '') {
return false;
}
} else if (lines[lines.length - 1] == '') {
lines.pop();
} else if (!fuzzFactor) {
return false;
}
} else if (addEOFNL) {
if (lines[lines.length - 1] != '') {
lines.push('');
} else if (!fuzzFactor) {
return false;
}
}
/**
* Checks if the hunk can be made to fit at the provided location with at most `maxErrors`
* insertions, substitutions, or deletions, while ensuring also that:
* - lines deleted in the hunk match exactly, and
* - wherever an insertion operation or block of insertion operations appears in the hunk, the
* immediately preceding and following lines of context match exactly
*
* `toPos` should be set such that lines[toPos] is meant to match hunkLines[0].
*
* If the hunk can be applied, returns an object with properties `oldLineLastI` and
* `replacementLines`. Otherwise, returns null.
*/
function applyHunk(hunkLines, toPos, maxErrors) {
var hunkLinesI = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 0;
var lastContextLineMatched = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : true;
var patchedLines = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : [];
var patchedLinesLength = arguments.length > 6 && arguments[6] !== undefined ? arguments[6] : 0;
var nConsecutiveOldContextLines = 0;
var nextContextLineMustMatch = false;
for (; hunkLinesI < hunkLines.length; hunkLinesI++) {
var hunkLine = hunkLines[hunkLinesI],
operation = hunkLine.length > 0 ? hunkLine[0] : ' ',
content = hunkLine.length > 0 ? hunkLine.substr(1) : hunkLine;
if (operation === '-') {
if (compareLine(toPos + 1, lines[toPos], operation, content)) {
toPos++;
nConsecutiveOldContextLines = 0;
} else {
if (!maxErrors || lines[toPos] == null) {
return null;
}
patchedLines[patchedLinesLength] = lines[toPos];
return applyHunk(hunkLines, toPos + 1, maxErrors - 1, hunkLinesI, false, patchedLines, patchedLinesLength + 1);
}
}
if (operation === '+') {
if (!lastContextLineMatched) {
return null;
}
patchedLines[patchedLinesLength] = content;
patchedLinesLength++;
nConsecutiveOldContextLines = 0;
nextContextLineMustMatch = true;
}
if (operation === ' ') {
nConsecutiveOldContextLines++;
patchedLines[patchedLinesLength] = lines[toPos];
if (compareLine(toPos + 1, lines[toPos], operation, content)) {
patchedLinesLength++;
lastContextLineMatched = true;
nextContextLineMustMatch = false;
toPos++;
} else {
if (nextContextLineMustMatch || !maxErrors) {
return null;
}
// Consider 3 possibilities in sequence:
// 1. lines contains a *substitution* not included in the patch context, or
// 2. lines contains an *insertion* not included in the patch context, or
// 3. lines contains a *deletion* not included in the patch context
// The first two options are of course only possible if the line from lines is non-null -
// i.e. only option 3 is possible if we've overrun the end of the old file.
return lines[toPos] && (applyHunk(hunkLines, toPos + 1, maxErrors - 1, hunkLinesI + 1, false, patchedLines, patchedLinesLength + 1) || applyHunk(hunkLines, toPos + 1, maxErrors - 1, hunkLinesI, false, patchedLines, patchedLinesLength + 1)) || applyHunk(hunkLines, toPos, maxErrors - 1, hunkLinesI + 1, false, patchedLines, patchedLinesLength);
}
}
}
// Before returning, trim any unmodified context lines off the end of patchedLines and reduce
// toPos (and thus oldLineLastI) accordingly. This allows later hunks to be applied to a region
// that starts in this hunk's trailing context.
patchedLinesLength -= nConsecutiveOldContextLines;
toPos -= nConsecutiveOldContextLines;
patchedLines.length = patchedLinesLength;
return {
patchedLines: patchedLines,
oldLineLastI: toPos - 1
};
}
var resultLines = [];
// Search best fit offsets for each hunk based on the previous ones
var prevHunkOffset = 0;
for (var _i = 0; _i < hunks.length; _i++) {
var hunk = hunks[_i];
var hunkResult = void 0;
var maxLine = lines.length - hunk.oldLines + fuzzFactor;
var toPos = void 0;
for (var maxErrors = 0; maxErrors <= fuzzFactor; maxErrors++) {
toPos = hunk.oldStart + prevHunkOffset - 1;
var iterator = (0, _distanceIterator["default"])(toPos, minLine, maxLine);
for (; toPos !== undefined; toPos = iterator()) {
hunkResult = applyHunk(hunk.lines, toPos, maxErrors);
if (hunkResult) {
break;
}
}
if (hunkResult) {
break;
}
}
if (!hunkResult) {
return false;
}
// Copy everything from the end of where we applied the last hunk to the start of this hunk
for (var _i2 = minLine; _i2 < toPos; _i2++) {
resultLines.push(lines[_i2]);
}
// Add the lines produced by applying the hunk:
for (var _i3 = 0; _i3 < hunkResult.patchedLines.length; _i3++) {
var _line = hunkResult.patchedLines[_i3];
resultLines.push(_line);
}
// Set lower text limit to end of the current hunk, so next ones don't try
// to fit over already patched text
minLine = hunkResult.oldLineLastI + 1;
// Note the offset between where the patch said the hunk should've applied and where we
// applied it, so we can adjust future hunks accordingly:
prevHunkOffset = toPos + 1 - hunk.oldStart;
}
// Copy over the rest of the lines from the old text
for (var _i4 = minLine; _i4 < lines.length; _i4++) {
resultLines.push(lines[_i4]);
}
return resultLines.join('\n');
}
// Wrapper that supports multiple file patches via callbacks.
function applyPatches(uniDiff, options) {
if (typeof uniDiff === 'string') {
uniDiff = (0, _parse.parsePatch)(uniDiff);
}
var currentIndex = 0;
function processIndex() {
var index = uniDiff[currentIndex++];
if (!index) {
return options.complete();
}
options.loadFile(index, function (err, data) {
if (err) {
return options.complete(err);
}
var updatedContent = applyPatch(data, index, options);
options.patched(index, updatedContent, function (err) {
if (err) {
return options.complete(err);
}
processIndex();
});
});
}
processIndex();
}
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"names":["_string","require","_lineEndings","_parse","_distanceIterator","_interopRequireDefault","e","__esModule","applyPatch","source","uniDiff","options","arguments","length","undefined","parsePatch","Array","isArray","Error","autoConvertLineEndings","hasOnlyWinLineEndings","isUnix","unixToWin","hasOnlyUnixLineEndings","isWin","winToUnix","lines","split","hunks","compareLine","lineNumber","line","operation","patchContent","fuzzFactor","minLine","Number","isInteger","prevLine","removeEOFNL","addEOFNL","i","pop","push","applyHunk","hunkLines","toPos","maxErrors","hunkLinesI","lastContextLineMatched","patchedLines","patchedLinesLength","nConsecutiveOldContextLines","nextContextLineMustMatch","hunkLine","content","substr","oldLineLastI","resultLines","prevHunkOffset","hunk","hunkResult","maxLine","oldLines","oldStart","iterator","distanceIterator","join","applyPatches","currentIndex","processIndex","index","complete","loadFile","err","data","updatedContent","patched"],"sources":["../../src/patch/apply.js"],"sourcesContent":["import {hasOnlyWinLineEndings, hasOnlyUnixLineEndings} from '../util/string';\nimport {isWin, isUnix, unixToWin, winToUnix} from './line-endings';\nimport {parsePatch} from './parse';\nimport distanceIterator from '../util/distance-iterator';\n\nexport function applyPatch(source, uniDiff, options = {}) {\n  if (typeof uniDiff === 'string') {\n    uniDiff = parsePatch(uniDiff);\n  }\n\n  if (Array.isArray(uniDiff)) {\n    if (uniDiff.length > 1) {\n      throw new Error('applyPatch only works with a single input.');\n    }\n\n    uniDiff = uniDiff[0];\n  }\n\n  if (options.autoConvertLineEndings || options.autoConvertLineEndings == null) {\n    if (hasOnlyWinLineEndings(source) && isUnix(uniDiff)) {\n      uniDiff = unixToWin(uniDiff);\n    } else if (hasOnlyUnixLineEndings(source) && isWin(uniDiff)) {\n      uniDiff = winToUnix(uniDiff);\n    }\n  }\n\n  // Apply the diff to the input\n  let lines = source.split('\\n'),\n      hunks = uniDiff.hunks,\n\n      compareLine = options.compareLine || ((lineNumber, line, operation, patchContent) => line === patchContent),\n      fuzzFactor = options.fuzzFactor || 0,\n      minLine = 0;\n\n  if (fuzzFactor < 0 || !Number.isInteger(fuzzFactor)) {\n    throw new Error('fuzzFactor must be a non-negative integer');\n  }\n\n  // Special case for empty patch.\n  if (!hunks.length) {\n    return source;\n  }\n\n  // Before anything else, handle EOFNL insertion/removal. If the patch tells us to make a change\n  // to the EOFNL that is redundant/impossible - i.e. to remove a newline that's not there, or add a\n  // newline that already exists - then we either return false and fail to apply the patch (if\n  // fuzzFactor is 0) or simply ignore the problem and do nothing (if fuzzFactor is >0).\n  // If we do need to remove/add a newline at EOF, this will always be in the final hunk:\n  let prevLine = '',\n      removeEOFNL = false,\n      addEOFNL = false;\n  for (let i = 0; i < hunks[hunks.length - 1].lines.length; i++) {\n    const line = hunks[hunks.length - 1].lines[i];\n    if (line[0] == '\\\\') {\n      if (prevLine[0] == '+') {\n        removeEOFNL = true;\n      } else if (prevLine[0] == '-') {\n        addEOFNL = true;\n      }\n    }\n    prevLine = line;\n  }\n  if (removeEOFNL) {\n    if (addEOFNL) {\n      // This means the final line gets changed but doesn't have a trailing newline in either the\n      // original or patched version. In that case, we do nothing if fuzzFactor > 0, and if\n      // fuzzFactor is 0, we simply validate that the source file has no trailing newline.\n      if (!fuzzFactor && lines[lines.length - 1] == '') {\n        return false;\n      }\n    } else if (lines[lines.length - 1] == '') {\n      lines.pop();\n    } else if (!fuzzFactor) {\n      return false;\n    }\n  } else if (addEOFNL) {\n    if (lines[lines.length - 1] != '') {\n      lines.push('');\n    } else if (!fuzzFactor) {\n      return false;\n    }\n  }\n\n  /**\n   * Checks if the hunk can be made to fit at the provided location with at most `maxErrors`\n   * insertions, substitutions, or deletions, while ensuring also that:\n   * - lines deleted in the hunk match exactly, and\n   * - wherever an insertion operation or block of insertion operations appears in the hunk, the\n   *   immediately preceding and following lines of context match exactly\n   *\n   * `toPos` should be set such that lines[toPos] is meant to match hunkLines[0].\n   *\n   * If the hunk can be applied, returns an object with properties `oldLineLastI` and\n   * `replacementLines`. Otherwise, returns null.\n   */\n  function applyHunk(\n    hunkLines,\n    toPos,\n    maxErrors,\n    hunkLinesI = 0,\n    lastContextLineMatched = true,\n    patchedLines = [],\n    patchedLinesLength = 0\n  ) {\n    let nConsecutiveOldContextLines = 0;\n    let nextContextLineMustMatch = false;\n    for (; hunkLinesI < hunkLines.length; hunkLinesI++) {\n      let hunkLine = hunkLines[hunkLinesI],\n          operation = (hunkLine.length > 0 ? hunkLine[0] : ' '),\n          content = (hunkLine.length > 0 ? hunkLine.substr(1) : hunkLine);\n\n      if (operation === '-') {\n        if (compareLine(toPos + 1, lines[toPos], operation, content)) {\n          toPos++;\n          nConsecutiveOldContextLines = 0;\n        } else {\n          if (!maxErrors || lines[toPos] == null) {\n            return null;\n          }\n          patchedLines[patchedLinesLength] = lines[toPos];\n          return applyHunk(\n            hunkLines,\n            toPos + 1,\n            maxErrors - 1,\n            hunkLinesI,\n            false,\n            patchedLines,\n            patchedLinesLength + 1\n          );\n        }\n      }\n\n      if (operation === '+') {\n        if (!lastContextLineMatched) {\n          return null;\n        }\n        patchedLines[patchedLinesLength] = content;\n        patchedLinesLength++;\n        nConsecutiveOldContextLines = 0;\n        nextContextLineMustMatch = true;\n      }\n\n      if (operation === ' ') {\n        nConsecutiveOldContextLines++;\n        patchedLines[patchedLinesLength] = lines[toPos];\n        if (compareLine(toPos + 1, lines[toPos], operation, content)) {\n          patchedLinesLength++;\n          lastContextLineMatched = true;\n          nextContextLineMustMatch = false;\n          toPos++;\n        } else {\n          if (nextContextLineMustMatch || !maxErrors) {\n            return null;\n          }\n\n          // Consider 3 possibilities in sequence:\n          // 1. lines contains a *substitution* not included in the patch context, or\n          // 2. lines contains an *insertion* not included in the patch context, or\n          // 3. lines contains a *deletion* not included in the patch context\n          // The first two options are of course only possible if the line from lines is non-null -\n          // i.e. only option 3 is possible if we've overrun the end of the old file.\n          return (\n            lines[toPos] && (\n              applyHunk(\n                hunkLines,\n                toPos + 1,\n                maxErrors - 1,\n                hunkLinesI + 1,\n                false,\n                patchedLines,\n                patchedLinesLength + 1\n              ) || applyHunk(\n                hunkLines,\n                toPos + 1,\n                maxErrors - 1,\n                hunkLinesI,\n                false,\n                patchedLines,\n                patchedLinesLength + 1\n              )\n            ) || applyHunk(\n              hunkLines,\n              toPos,\n              maxErrors - 1,\n              hunkLinesI + 1,\n              false,\n              patchedLines,\n              patchedLinesLength\n            )\n          );\n        }\n      }\n    }\n\n    // Before returning, trim any unmodified context lines off the end of patchedLines and reduce\n    // toPos (and thus oldLineLastI) accordingly. This allows later hunks to be applied to a region\n    // that starts in this hunk's trailing context.\n    patchedLinesLength -= nConsecutiveOldContextLines;\n    toPos -= nConsecutiveOldContextLines;\n    patchedLines.length = patchedLinesLength;\n    return {\n      patchedLines,\n      oldLineLastI: toPos - 1\n    };\n  }\n\n  const resultLines = [];\n\n  // Search best fit offsets for each hunk based on the previous ones\n  let prevHunkOffset = 0;\n  for (let i = 0; i < hunks.length; i++) {\n    const hunk = hunks[i];\n    let hunkResult;\n    let maxLine = lines.length - hunk.oldLines + fuzzFactor;\n    let toPos;\n    for (let maxErrors = 0; maxErrors <= fuzzFactor; maxErrors++) {\n      toPos = hunk.oldStart + prevHunkOffset - 1;\n      let iterator = distanceIterator(toPos, minLine, maxLine);\n      for (; toPos !== undefined; toPos = iterator()) {\n        hunkResult = applyHunk(hunk.lines, toPos, maxErrors);\n        if (hunkResult) {\n          break;\n        }\n      }\n      if (hunkResult) {\n        break;\n      }\n    }\n\n    if (!hunkResult) {\n      return false;\n    }\n\n    // Copy everything from the end of where we applied the last hunk to the start of this hunk\n    for (let i = minLine; i < toPos; i++) {\n      resultLines.push(lines[i]);\n    }\n\n    // Add the lines produced by applying the hunk:\n    for (let i = 0; i < hunkResult.patchedLines.length; i++) {\n      const line = hunkResult.patchedLines[i];\n      resultLines.push(line);\n    }\n\n    // Set lower text limit to end of the current hunk, so next ones don't try\n    // to fit over already patched text\n    minLine = hunkResult.oldLineLastI + 1;\n\n    // Note the offset between where the patch said the hunk should've applied and where we\n    // applied it, so we can adjust future hunks accordingly:\n    prevHunkOffset = toPos + 1 - hunk.oldStart;\n  }\n\n  // Copy over the rest of the lines from the old text\n  for (let i = minLine; i < lines.length; i++) {\n    resultLines.push(lines[i]);\n  }\n\n  return resultLines.join('\\n');\n}\n\n// Wrapper that supports multiple file patches via callbacks.\nexport function applyPatches(uniDiff, options) {\n  if (typeof uniDiff === 'string') {\n    uniDiff = parsePatch(uniDiff);\n  }\n\n  let currentIndex = 0;\n  function processIndex() {\n    let index = uniDiff[currentIndex++];\n    if (!index) {\n      return options.complete();\n    }\n\n    options.loadFile(index, function(err, data) {\n      if (err) {\n        return options.complete(err);\n      }\n\n      let updatedContent = applyPatch(data, index, options);\n      options.patched(index, updatedContent, function(err) {\n        if (err) {\n          return options.complete(err);\n        }\n\n        processIndex();\n      });\n    });\n  }\n  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