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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:meta/meta.dart';
import '../../base/file_system.dart';
import '../../base/logger.dart';
/// iOS project is generated from a template on Flutter project creation.
/// Sometimes (due to behavior changes in Xcode, CocoaPods, etc) these files need to be altered
/// from the original template.
abstract class IOSMigrator {
IOSMigrator(this.logger);
@protected
final Logger logger;
/// Returns whether migration was successful or was skipped.
bool migrate();
/// Return null if the line should be deleted.
@protected
String migrateLine(String line) {
return line;
}
@protected
void processFileLines(File file) {
final List<String> lines = file.readAsLinesSync();
final StringBuffer newProjectContents = StringBuffer();
final String basename = file.basename;
bool migrationRequired = false;
for (final String line in lines) {
final String newProjectLine = migrateLine(line);
if (newProjectLine == null) {
logger.printTrace('Migrating $basename, removing:');
logger.printTrace(' $line');
migrationRequired = true;
continue;
}
if (newProjectLine != line) {
logger.printTrace('Migrating $basename, replacing:');
logger.printTrace(' $line');
logger.printTrace('with:');
logger.printTrace(' $newProjectLine');
migrationRequired = true;
}
newProjectContents.writeln(newProjectLine);
}
if (migrationRequired) {
logger.printStatus('Upgrading $basename');
file.writeAsStringSync(newProjectContents.toString());
}
}
}
class IOSMigration {
IOSMigration(this.migrators);
final List<IOSMigrator> migrators;
bool run() {
for (final IOSMigrator migrator in migrators) {
if (!migrator.migrate()) {
// Migration failures should be more robust, with transactions and fallbacks.
// See https://github.com/flutter/flutter/issues/12573 and
// https://github.com/flutter/flutter/issues/40460
return false;
}
}
return true;
}
}