ngx-text-diff
Version:
A Text Diff component for Angular.
207 lines • 28.5 kB
JavaScript
import { __decorate, __metadata } from "tslib";
import { Injectable } from '@angular/core';
import { DIFF_DELETE, DIFF_EQUAL, DIFF_INSERT, diff_match_patch } from 'diff-match-patch';
import { isEmpty } from './ngx-text-diff.utils';
import * as i0 from "@angular/core";
var NgxTextDiffService = /** @class */ (function () {
function NgxTextDiffService() {
this.initParser();
}
NgxTextDiffService.prototype.initParser = function () {
this.diffParser = new diff_match_patch();
};
NgxTextDiffService.prototype.getDiffsByLines = function (left, right) {
var _this = this;
return new Promise(function (resolve, reject) {
var a = _this.diffParser.diff_linesToChars_(left, right);
var lineText1 = a.chars1;
var lineText2 = a.chars2;
var linesArray = a.lineArray;
var diffs = _this.diffParser.diff_main(lineText1, lineText2, true);
_this.diffParser.diff_charsToLines_(diffs, linesArray);
var rows = _this.formatOutput(diffs);
if (!rows) {
reject('Error');
}
resolve(rows);
});
};
NgxTextDiffService.prototype.formatOutput = function (diffs) {
var _this = this;
var lineLeft = 1;
var lineRight = 1;
return diffs.reduce(function (rows, diff) {
if (!rows) {
rows = [];
}
var diffType = diff[0];
var diffValue = diff[1];
var leftDiffRow = null;
var rightDiffRow = null;
var leftContent = null;
var rightContent = null;
var rowTemp = null;
switch (diffType) {
case DIFF_EQUAL: // 0
diffValue
.split('\n')
.filter(function (value, index, array) {
if (index === array.length - 1) {
return !isEmpty(value);
}
return true;
})
.forEach(function (line) {
leftContent = {
lineNumber: lineLeft,
lineContent: line,
lineDiffs: [],
prefix: ''
};
rightContent = {
lineNumber: lineRight,
lineContent: line,
lineDiffs: [],
prefix: ''
};
rowTemp = {
leftContent: leftContent,
rightContent: rightContent,
belongTo: 'both',
hasDiffs: false,
numDiffs: 0,
};
rows.push(rowTemp);
lineRight = lineRight + 1;
lineLeft = lineLeft + 1;
});
break;
case DIFF_DELETE: // -1
diffValue
.split('\n')
.filter(function (value, index, array) {
if (index === array.length - 1) {
return !isEmpty(value);
}
return true;
})
.forEach(function (line) {
rightDiffRow = rows.find(function (row) { return !row.leftContent && row.rightContent && row.rightContent.lineNumber === lineLeft && row.rightContent.prefix !== ''; });
leftContent = {
lineNumber: lineLeft,
lineContent: line,
lineDiffs: [{ content: line, isDiff: true }],
prefix: '-'
};
if (rightDiffRow) {
rightDiffRow.leftContent = leftContent;
rightDiffRow.leftContent.lineDiffs = _this.getDiffParts(rightDiffRow.leftContent.lineContent, rightDiffRow.rightContent.lineContent);
rightDiffRow.rightContent.lineDiffs = _this.getDiffParts(rightDiffRow.rightContent.lineContent, rightDiffRow.leftContent.lineContent);
rightDiffRow.belongTo = 'both';
rightDiffRow.numDiffs = _this.countDiffs(rightDiffRow);
}
else {
rows.push({
leftContent: leftContent,
rightContent: null,
hasDiffs: true,
belongTo: 'left',
numDiffs: 1,
});
}
lineLeft = lineLeft + 1;
});
break;
case DIFF_INSERT: // 1
diffValue
.split('\n')
.filter(function (value, index, array) {
if (index === array.length - 1) {
return !isEmpty(value);
}
return true;
})
.forEach(function (line) {
leftDiffRow = rows.find(function (row) { return row.leftContent && !row.rightContent && row.leftContent.lineNumber === lineRight && row.leftContent.prefix !== ''; });
rightContent = {
lineNumber: lineRight,
lineContent: line,
lineDiffs: [{ content: line, isDiff: true }],
prefix: '+'
};
if (leftDiffRow) {
leftDiffRow.rightContent = rightContent;
leftDiffRow.leftContent.lineDiffs = _this.getDiffParts(leftDiffRow.leftContent.lineContent, leftDiffRow.rightContent.lineContent);
leftDiffRow.rightContent.lineDiffs = _this.getDiffParts(leftDiffRow.rightContent.lineContent, leftDiffRow.leftContent.lineContent);
leftDiffRow.belongTo = 'both';
leftDiffRow.numDiffs = _this.countDiffs(leftDiffRow);
}
else {
rows.push({
leftContent: null,
rightContent: rightContent,
hasDiffs: true,
belongTo: 'right',
numDiffs: 1,
});
}
lineRight = lineRight + 1;
});
break;
}
return rows;
}, []);
};
NgxTextDiffService.prototype.countDiffs = function (result) {
var diffCount = 0;
if (result.leftContent) {
diffCount += result.leftContent.lineDiffs.filter(function (diff) { return diff.isDiff; }).length;
}
if (result.leftContent) {
diffCount += result.rightContent.lineDiffs.filter(function (diff) { return diff.isDiff; }).length;
}
return diffCount;
};
NgxTextDiffService.prototype.getDiffParts = function (value, compareValue) {
var diffParts = [];
var i = 0;
var j = 0;
var shared = '';
var diff = '';
while (i < value.length) {
if (value[i] === compareValue[j] && j < compareValue.length) {
if (diff !== '') {
diffParts.push({ content: diff, isDiff: true });
diff = '';
}
shared += value[i];
}
else {
if (shared !== '') {
diffParts.push({ content: shared, isDiff: false });
shared = '';
}
diff += value[i];
}
i++;
j++;
}
if (diff !== '') {
diffParts.push({ content: diff, isDiff: true });
}
else if (shared !== '') {
diffParts.push({ content: shared, isDiff: false });
}
return diffParts;
};
NgxTextDiffService.ɵprov = i0.ɵɵdefineInjectable({ factory: function NgxTextDiffService_Factory() { return new NgxTextDiffService(); }, token: NgxTextDiffService, providedIn: "root" });
NgxTextDiffService = __decorate([
Injectable({
providedIn: 'root'
}),
__metadata("design:paramtypes", [])
], NgxTextDiffService);
return NgxTextDiffService;
}());
export { NgxTextDiffService };
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{ Injectable } from '@angular/core';\r\nimport { Diff, DIFF_DELETE, DIFF_EQUAL, DIFF_INSERT, diff_match_patch } from 'diff-match-patch';\r\nimport { DiffLineResult, DiffPart, DiffTableRowResult } from './ngx-text-diff.model';\r\nimport { isEmpty, isNil } from './ngx-text-diff.utils';\r\n\r\n@Injectable({\r\n  providedIn: 'root'\r\n})\r\nexport class NgxTextDiffService {\r\n  diffParser: diff_match_patch;\r\n\r\n  constructor() {\r\n    this.initParser();\r\n  }\r\n\r\n  private initParser() {\r\n    this.diffParser = new diff_match_patch();\r\n  }\r\n\r\n  getDiffsByLines(left: string, right: string): Promise<DiffTableRowResult[]> {\r\n    return new Promise<DiffTableRowResult[]>((resolve, reject) => {\r\n      const a = this.diffParser.diff_linesToChars_(left, right);\r\n      const lineText1 = a.chars1;\r\n      const lineText2 = a.chars2;\r\n      const linesArray = a.lineArray;\r\n      const diffs: Diff[] = this.diffParser.diff_main(lineText1, lineText2, true);\r\n      this.diffParser.diff_charsToLines_(diffs, linesArray);\r\n      const rows: DiffTableRowResult[] = this.formatOutput(diffs);\r\n      if (!rows) {\r\n        reject('Error');\r\n      }\r\n\r\n      resolve(rows);\r\n    });\r\n  }\r\n\r\n  private formatOutput(diffs: Diff[]): DiffTableRowResult[] {\r\n    let lineLeft = 1;\r\n    let lineRight = 1;\r\n    return diffs.reduce((rows: DiffTableRowResult[], diff: Diff) => {\r\n      if (!rows) {\r\n        rows = [];\r\n      }\r\n      const diffType: number = diff[0];\r\n      const diffValue: string = diff[1];\r\n      let leftDiffRow: DiffTableRowResult = null;\r\n      let rightDiffRow: DiffTableRowResult = null;\r\n      let leftContent: DiffLineResult = null;\r\n      let rightContent: DiffLineResult = null;\r\n      let rowTemp: DiffTableRowResult = null;\r\n      switch (diffType) {\r\n        case DIFF_EQUAL: // 0\r\n          diffValue\r\n            .split('\\n')\r\n            .filter((value, index, array) => {\r\n              if (index === array.length - 1) {\r\n                return !isEmpty(value);\r\n              }\r\n              return true;\r\n            })\r\n            .forEach(line => {\r\n              leftContent = {\r\n                lineNumber: lineLeft,\r\n                lineContent: line,\r\n                lineDiffs: [],\r\n                prefix: ''\r\n              };\r\n              rightContent = {\r\n                lineNumber: lineRight,\r\n                lineContent: line,\r\n                lineDiffs: [],\r\n                prefix: ''\r\n              };\r\n              rowTemp = {\r\n                leftContent,\r\n                rightContent,\r\n                belongTo: 'both',\r\n                hasDiffs: false,\r\n                numDiffs: 0,\r\n              };\r\n              rows.push(rowTemp);\r\n              lineRight = lineRight + 1;\r\n              lineLeft = lineLeft + 1;\r\n            });\r\n          break;\r\n        case DIFF_DELETE: // -1\r\n          diffValue\r\n            .split('\\n')\r\n            .filter((value, index, array) => {\r\n              if (index === array.length - 1) {\r\n                return !isEmpty(value);\r\n              }\r\n              return true;\r\n            })\r\n            .forEach(line => {\r\n              rightDiffRow = rows.find(\r\n                row => !row.leftContent && row.rightContent && row.rightContent.lineNumber === lineLeft && row.rightContent.prefix !== ''\r\n              );\r\n              leftContent = {\r\n                lineNumber: lineLeft,\r\n                lineContent: line,\r\n                lineDiffs: [{ content: line, isDiff: true }],\r\n                prefix: '-'\r\n              };\r\n              if (rightDiffRow) {\r\n                rightDiffRow.leftContent = leftContent;\r\n                rightDiffRow.leftContent.lineDiffs = this.getDiffParts(\r\n                  rightDiffRow.leftContent.lineContent,\r\n                  rightDiffRow.rightContent.lineContent\r\n                );\r\n                rightDiffRow.rightContent.lineDiffs = this.getDiffParts(\r\n                  rightDiffRow.rightContent.lineContent,\r\n                  rightDiffRow.leftContent.lineContent\r\n                );\r\n                rightDiffRow.belongTo = 'both';\r\n                rightDiffRow.numDiffs = this.countDiffs(rightDiffRow);\r\n              } else {\r\n                rows.push({\r\n                  leftContent,\r\n                  rightContent: null,\r\n                  hasDiffs: true,\r\n                  belongTo: 'left',\r\n                  numDiffs: 1,\r\n                });\r\n              }\r\n              lineLeft = lineLeft + 1;\r\n            });\r\n          break;\r\n        case DIFF_INSERT: // 1\r\n          diffValue\r\n            .split('\\n')\r\n            .filter((value, index, array) => {\r\n              if (index === array.length - 1) {\r\n                return !isEmpty(value);\r\n              }\r\n              return true;\r\n            })\r\n            .forEach(line => {\r\n              leftDiffRow = rows.find(\r\n                row => row.leftContent && !row.rightContent && row.leftContent.lineNumber === lineRight && row.leftContent.prefix !== ''\r\n              );\r\n              rightContent = {\r\n                lineNumber: lineRight,\r\n                lineContent: line,\r\n                lineDiffs: [{ content: line, isDiff: true }],\r\n                prefix: '+'\r\n              };\r\n              if (leftDiffRow) {\r\n                leftDiffRow.rightContent = rightContent;\r\n                leftDiffRow.leftContent.lineDiffs = this.getDiffParts(\r\n                  leftDiffRow.leftContent.lineContent,\r\n                  leftDiffRow.rightContent.lineContent\r\n                );\r\n                leftDiffRow.rightContent.lineDiffs = this.getDiffParts(\r\n                  leftDiffRow.rightContent.lineContent,\r\n                  leftDiffRow.leftContent.lineContent\r\n                );\r\n                leftDiffRow.belongTo = 'both';\r\n                leftDiffRow.numDiffs = this.countDiffs(leftDiffRow);\r\n              } else {\r\n                rows.push({\r\n                  leftContent: null,\r\n                  rightContent,\r\n                  hasDiffs: true,\r\n                  belongTo: 'right',\r\n                  numDiffs: 1,\r\n                });\r\n              }\r\n              lineRight = lineRight + 1;\r\n            });\r\n          break;\r\n      }\r\n      return rows;\r\n    }, []);\r\n  }\r\n\r\n  private countDiffs(result: DiffTableRowResult): number {\r\n    let diffCount = 0;\r\n    if (result.leftContent) {\r\n      diffCount += result.leftContent.lineDiffs.filter(diff => diff.isDiff).length;\r\n    }\r\n    if (result.leftContent) {\r\n      diffCount += result.rightContent.lineDiffs.filter(diff => diff.isDiff).length;\r\n    }\r\n    return diffCount;\r\n  }\r\n\r\n  private getDiffParts(value: string, compareValue: string): DiffPart[] {\r\n    const diffParts: DiffPart[] = [];\r\n    let i = 0;\r\n    let j = 0;\r\n    let shared = '';\r\n    let diff = '';\r\n\r\n    while (i < value.length) {\r\n      if (value[i] === compareValue[j] && j < compareValue.length) {\r\n        if (diff !== '') {\r\n          diffParts.push({ content: diff, isDiff: true });\r\n          diff = '';\r\n        }\r\n        shared += value[i];\r\n      } else {\r\n        if (shared !== '') {\r\n          diffParts.push({ content: shared, isDiff: false });\r\n          shared = '';\r\n        }\r\n        diff += value[i];\r\n      }\r\n      i++;\r\n      j++;\r\n    }\r\n\r\n    if (diff !== '') {\r\n      diffParts.push({ content: diff, isDiff: true });\r\n    } else if (shared !== '') {\r\n      diffParts.push({ content: shared, isDiff: false });\r\n    }\r\n\r\n    return diffParts;\r\n  }\r\n}\r\n"]}