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/*
* Diff Match and Patch
* Copyright 2018 The diff-match-patch Authors.
* https://github.com/google/diff-match-patch
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
part of DiffMatchPatch;
/**
* Class representing one patch operation.
*/
class Patch {
List<Diff> diffs;
int start1;
int start2;
int length1 = 0;
int length2 = 0;
/**
* Constructor. Initializes with an empty list of diffs.
*/
Patch() {
this.diffs = <Diff>[];
}
/**
* Emulate GNU diff's format.
* Header: @@ -382,8 +481,9 @@
* Indices are printed as 1-based, not 0-based.
* Returns the GNU diff string.
*/
String toString() {
String coords1, coords2;
if (this.length1 == 0) {
coords1 = '${this.start1},0';
} else if (this.length1 == 1) {
coords1 = (this.start1 + 1).toString();
} else {
coords1 = '${this.start1 + 1},${this.length1}';
}
if (this.length2 == 0) {
coords2 = '${this.start2},0';
} else if (this.length2 == 1) {
coords2 = (this.start2 + 1).toString();
} else {
coords2 = '${this.start2 + 1},${this.length2}';
}
final text = new StringBuffer('@@ -$coords1 +$coords2 @@\n');
// Escape the body of the patch with %xx notation.
for (Diff aDiff in this.diffs) {
switch (aDiff.operation) {
case Operation.insert:
text.write('+');
break;
case Operation.delete:
text.write('-');
break;
case Operation.equal:
text.write(' ');
break;
}
text.write(Uri.encodeFull(aDiff.text));
text.write('\n');
}
return text.toString().replaceAll('%20', ' ');
}
}
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