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144 lines
3.9 KiB
JavaScript

'use strict';
Object.defineProperty(exports, '__esModule', {
value: true
});
exports.diffLinesRaw = exports.diffLinesUnified2 = exports.diffLinesUnified = void 0;
var _diffSequences = _interopRequireDefault(require('diff-sequences'));
var _cleanupSemantic = require('./cleanupSemantic');
var _normalizeDiffOptions = require('./normalizeDiffOptions');
var _printDiffs = require('./printDiffs');
function _interopRequireDefault(obj) {
return obj && obj.__esModule ? obj : {default: obj};
}
/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
const isEmptyString = lines => lines.length === 1 && lines[0].length === 0; // Compare two arrays of strings line-by-line. Format as comparison lines.
const diffLinesUnified = (aLines, bLines, options) =>
(0, _printDiffs.printDiffLines)(
diffLinesRaw(
isEmptyString(aLines) ? [] : aLines,
isEmptyString(bLines) ? [] : bLines
),
(0, _normalizeDiffOptions.normalizeDiffOptions)(options)
); // Given two pairs of arrays of strings:
// Compare the pair of comparison arrays line-by-line.
// Format the corresponding lines in the pair of displayable arrays.
exports.diffLinesUnified = diffLinesUnified;
const diffLinesUnified2 = (
aLinesDisplay,
bLinesDisplay,
aLinesCompare,
bLinesCompare,
options
) => {
if (isEmptyString(aLinesDisplay) && isEmptyString(aLinesCompare)) {
aLinesDisplay = [];
aLinesCompare = [];
}
if (isEmptyString(bLinesDisplay) && isEmptyString(bLinesCompare)) {
bLinesDisplay = [];
bLinesCompare = [];
}
if (
aLinesDisplay.length !== aLinesCompare.length ||
bLinesDisplay.length !== bLinesCompare.length
) {
// Fall back to diff of display lines.
return diffLinesUnified(aLinesDisplay, bLinesDisplay, options);
}
const diffs = diffLinesRaw(aLinesCompare, bLinesCompare); // Replace comparison lines with displayable lines.
let aIndex = 0;
let bIndex = 0;
diffs.forEach(diff => {
switch (diff[0]) {
case _cleanupSemantic.DIFF_DELETE:
diff[1] = aLinesDisplay[aIndex];
aIndex += 1;
break;
case _cleanupSemantic.DIFF_INSERT:
diff[1] = bLinesDisplay[bIndex];
bIndex += 1;
break;
default:
diff[1] = bLinesDisplay[bIndex];
aIndex += 1;
bIndex += 1;
}
});
return (0, _printDiffs.printDiffLines)(
diffs,
(0, _normalizeDiffOptions.normalizeDiffOptions)(options)
);
}; // Compare two arrays of strings line-by-line.
exports.diffLinesUnified2 = diffLinesUnified2;
const diffLinesRaw = (aLines, bLines) => {
const aLength = aLines.length;
const bLength = bLines.length;
const isCommon = (aIndex, bIndex) => aLines[aIndex] === bLines[bIndex];
const diffs = [];
let aIndex = 0;
let bIndex = 0;
const foundSubsequence = (nCommon, aCommon, bCommon) => {
for (; aIndex !== aCommon; aIndex += 1) {
diffs.push(
new _cleanupSemantic.Diff(_cleanupSemantic.DIFF_DELETE, aLines[aIndex])
);
}
for (; bIndex !== bCommon; bIndex += 1) {
diffs.push(
new _cleanupSemantic.Diff(_cleanupSemantic.DIFF_INSERT, bLines[bIndex])
);
}
for (; nCommon !== 0; nCommon -= 1, aIndex += 1, bIndex += 1) {
diffs.push(
new _cleanupSemantic.Diff(_cleanupSemantic.DIFF_EQUAL, bLines[bIndex])
);
}
};
(0, _diffSequences.default)(aLength, bLength, isCommon, foundSubsequence); // After the last common subsequence, push remaining change items.
for (; aIndex !== aLength; aIndex += 1) {
diffs.push(
new _cleanupSemantic.Diff(_cleanupSemantic.DIFF_DELETE, aLines[aIndex])
);
}
for (; bIndex !== bLength; bIndex += 1) {
diffs.push(
new _cleanupSemantic.Diff(_cleanupSemantic.DIFF_INSERT, bLines[bIndex])
);
}
return diffs;
};
exports.diffLinesRaw = diffLinesRaw;