Johnni Winther
72534f18fa
Change-Id: I0a678e971395f70d09a3faf004e6476a9b5a48cb Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/395000 Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Jens Johansen <jensj@google.com>
85 lines
2.4 KiB
Dart
85 lines
2.4 KiB
Dart
// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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/// Expand a file with diffs in common merge conflict format into a [List] that
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/// can be passed to [expandUpdates].
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///
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/// For example:
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/// first
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/// <<<<
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/// v1
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/// ====
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/// v2
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/// ====
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/// v3
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/// >>>>
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/// last
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///
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/// Would be expanded to something equivalent to:
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///
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/// ["first\n", ["v1\n", "v2\n", "v3\n"], "last\n"]
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List expandDiff(String text) {
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List result = [new StringBuffer()];
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bool inDiff = false;
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for (String line in splitLines(text)) {
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if (inDiff) {
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if (line.startsWith("====")) {
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result.last.add(new StringBuffer());
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} else if (line.startsWith(">>>>")) {
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inDiff = false;
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result.add(new StringBuffer());
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} else {
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result.last.last.write(line);
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}
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} else if (line.startsWith("<<<<")) {
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inDiff = true;
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result.add(<StringBuffer>[new StringBuffer()]);
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} else {
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result.last.write(line);
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}
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}
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return result;
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}
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/// Returns [updates] expanded to full compilation units/source files.
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///
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/// [updates] is a convenient way to write updates/patches to a single source
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/// file without repeating common parts.
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///
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/// For example:
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/// ["head ", ["v1", "v2"], " tail"]
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/// expands to:
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/// ["head v1 tail", "head v2 tail"]
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List<String> expandUpdates(List updates) {
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int outputCount = updates.firstWhere((e) => e is Iterable).length;
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List<StringBuffer> result = new List<StringBuffer>.generate(
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outputCount, (_) => new StringBuffer(),
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growable: false);
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for (var chunk in updates) {
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if (chunk is Iterable) {
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int segmentCount = 0;
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for (var segment in chunk) {
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result[segmentCount++].write(segment);
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}
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if (segmentCount != outputCount) {
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throw new ArgumentError("Expected ${outputCount} segments, "
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"but found ${segmentCount} in $chunk");
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}
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} else {
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for (StringBuffer buffer in result) {
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buffer.write(chunk);
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}
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}
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}
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return result.map((e) => '$e').toList();
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}
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/// Split [text] into lines preserving trailing newlines (unlike
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/// String.split("\n"). Also, if [text] is empty, return an empty list (unlike
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/// String.split("\n")).
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List<String> splitLines(String text) {
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return text.split(new RegExp('^', multiLine: true));
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}
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