Peter von der Ahé
632bba54b9
Change-Id: I38e969e494c671982ec2cba96d2657a836dd0d49 Reviewed-on: https://dart-review.googlesource.com/24122 Commit-Queue: Peter von der Ahé <ahe@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com>
88 lines
2.5 KiB
Dart
88 lines
2.5 KiB
Dart
// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
|
|
// for details. All rights reserved. Use of this source code is governed by a
|
|
// BSD-style license that can be found in the LICENSE.md file.
|
|
|
|
library fasta.test.incremental_source_files;
|
|
|
|
/// Expand a file with diffs in common merge conflict format into a [List] that
|
|
/// can be passed to [expandUpdates].
|
|
///
|
|
/// For example:
|
|
/// first
|
|
/// <<<<
|
|
/// v1
|
|
/// ====
|
|
/// v2
|
|
/// ====
|
|
/// v3
|
|
/// >>>>
|
|
/// last
|
|
///
|
|
/// Would be expanded to something equivalent to:
|
|
///
|
|
/// ["first\n", ["v1\n", "v2\n", "v3\n"], "last\n"]
|
|
List expandDiff(String text) {
|
|
List result = [new StringBuffer()];
|
|
bool inDiff = false;
|
|
for (String line in splitLines(text)) {
|
|
if (inDiff) {
|
|
if (line.startsWith("====")) {
|
|
result.last.add(new StringBuffer());
|
|
} else if (line.startsWith(">>>>")) {
|
|
inDiff = false;
|
|
result.add(new StringBuffer());
|
|
} else {
|
|
result.last.last.write(line);
|
|
}
|
|
} else if (line.startsWith("<<<<")) {
|
|
inDiff = true;
|
|
result.add(<StringBuffer>[new StringBuffer()]);
|
|
} else {
|
|
result.last.write(line);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/// Returns [updates] expanded to full compilation units/source files.
|
|
///
|
|
/// [updates] is a convenient way to write updates/patches to a single source
|
|
/// file without repeating common parts.
|
|
///
|
|
/// For example:
|
|
/// ["head ", ["v1", "v2"], " tail"]
|
|
/// expands to:
|
|
/// ["head v1 tail", "head v2 tail"]
|
|
List<String> expandUpdates(List updates) {
|
|
int outputCount = updates.firstWhere((e) => e is Iterable).length;
|
|
List<StringBuffer> result = new List<StringBuffer>(outputCount);
|
|
for (int i = 0; i < outputCount; i++) {
|
|
result[i] = new StringBuffer();
|
|
}
|
|
for (var chunk in updates) {
|
|
if (chunk is Iterable) {
|
|
int segmentCount = 0;
|
|
for (var segment in chunk) {
|
|
result[segmentCount++].write(segment);
|
|
}
|
|
if (segmentCount != outputCount) {
|
|
throw new ArgumentError("Expected ${outputCount} segments, "
|
|
"but found ${segmentCount} in $chunk");
|
|
}
|
|
} else {
|
|
for (StringBuffer buffer in result) {
|
|
buffer.write(chunk);
|
|
}
|
|
}
|
|
}
|
|
|
|
return result.map((e) => '$e').toList();
|
|
}
|
|
|
|
/// Split [text] into lines preserving trailing newlines (unlike
|
|
/// String.split("\n"). Also, if [text] is empty, return an empty list (unlike
|
|
/// String.split("\n")).
|
|
List<String> splitLines(String text) {
|
|
return text.split(new RegExp('^', multiLine: true));
|
|
}
|