// Copyright 2016 The Chromium 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:mustache/mustache.dart' as mustache; import 'base/file_system.dart'; import 'cache.dart'; import 'globals.dart'; /// Expands templates in a directory to a destination. All files that must /// undergo template expansion should end with the '.tmpl' extension. All other /// files are ignored. In case the contents of entire directories must be copied /// as is, the directory itself can end with '.tmpl' extension. Files within /// such a directory may also contain the '.tmpl' extension and will be /// considered for expansion. In case certain files need to be copied but /// without template expansion (images, data files, etc.), the '.copy.tmpl' /// extension may be used. /// /// Folders with platform/language-specific content must be named /// '<platform>-<language>.tmpl'. /// /// Files in the destination will contain none of the '.tmpl', '.copy.tmpl' /// or '-<language>.tmpl' extensions. class Template { Template(Directory templateSource, Directory baseDir) { _templateFilePaths = <String, String>{}; if (!templateSource.existsSync()) { return; } final List<FileSystemEntity> templateFiles = templateSource.listSync(recursive: true); for (FileSystemEntity entity in templateFiles) { if (entity is! File) { // We are only interesting in template *file* URIs. continue; } final String relativePath = fs.path.relative(entity.path, from: baseDir.absolute.path); if (relativePath.contains(templateExtension)) { // If '.tmpl' appears anywhere within the path of this entity, it is // is a candidate for rendering. This catches cases where the folder // itself is a template. _templateFilePaths[relativePath] = fs.path.absolute(entity.path); } } } factory Template.fromName(String name) { // All named templates are placed in the 'templates' directory final Directory templateDir = templateDirectoryInPackage(name); return Template(templateDir, templateDir); } static const String templateExtension = '.tmpl'; static const String copyTemplateExtension = '.copy.tmpl'; final Pattern _kTemplateLanguageVariant = RegExp(r'(\w+)-(\w+)\.tmpl.*'); Map<String /* relative */, String /* absolute source */> _templateFilePaths; int render( Directory destination, Map<String, dynamic> context, { bool overwriteExisting = true, bool printStatusWhenWriting = true, }) { destination.createSync(recursive: true); int fileCount = 0; /// Returns the resolved destination path corresponding to the specified /// raw destination path, after performing language filtering and template /// expansion on the path itself. /// /// Returns null if the given raw destination path has been filtered. String renderPath(String relativeDestinationPath) { final Match match = _kTemplateLanguageVariant.matchAsPrefix(relativeDestinationPath); if (match != null) { final String platform = match.group(1); final String language = context['${platform}Language']; if (language != match.group(2)) return null; relativeDestinationPath = relativeDestinationPath.replaceAll('$platform-$language.tmpl', platform); } final String projectName = context['projectName']; final String androidIdentifier = context['androidIdentifier']; final String pluginClass = context['pluginClass']; final String destinationDirPath = destination.absolute.path; final String pathSeparator = fs.path.separator; String finalDestinationPath = fs.path .join(destinationDirPath, relativeDestinationPath) .replaceAll(copyTemplateExtension, '') .replaceAll(templateExtension, ''); if (androidIdentifier != null) { finalDestinationPath = finalDestinationPath .replaceAll('androidIdentifier', androidIdentifier.replaceAll('.', pathSeparator)); } if (projectName != null) finalDestinationPath = finalDestinationPath.replaceAll('projectName', projectName); if (pluginClass != null) finalDestinationPath = finalDestinationPath.replaceAll('pluginClass', pluginClass); return finalDestinationPath; } _templateFilePaths.forEach((String relativeDestinationPath, String absoluteSourcePath) { final bool withRootModule = context['withRootModule'] ?? false; if (!withRootModule && absoluteSourcePath.contains('flutter_root')) return; final String finalDestinationPath = renderPath(relativeDestinationPath); if (finalDestinationPath == null) return; final File finalDestinationFile = fs.file(finalDestinationPath); final String relativePathForLogging = fs.path.relative(finalDestinationFile.path); // Step 1: Check if the file needs to be overwritten. if (finalDestinationFile.existsSync()) { if (overwriteExisting) { finalDestinationFile.deleteSync(recursive: true); if (printStatusWhenWriting) printStatus(' $relativePathForLogging (overwritten)'); } else { // The file exists but we cannot overwrite it, move on. if (printStatusWhenWriting) printTrace(' $relativePathForLogging (existing - skipped)'); return; } } else { if (printStatusWhenWriting) printStatus(' $relativePathForLogging (created)'); } fileCount++; finalDestinationFile.createSync(recursive: true); final File sourceFile = fs.file(absoluteSourcePath); // Step 2: If the absolute paths ends with a '.copy.tmpl', this file does // not need mustache rendering but needs to be directly copied. if (sourceFile.path.endsWith(copyTemplateExtension)) { sourceFile.copySync(finalDestinationFile.path); return; } // Step 3: If the absolute path ends with a '.tmpl', this file needs // rendering via mustache. if (sourceFile.path.endsWith(templateExtension)) { final String templateContents = sourceFile.readAsStringSync(); final String renderedContents = mustache.Template(templateContents).renderString(context); finalDestinationFile.writeAsStringSync(renderedContents); return; } // Step 4: This file does not end in .tmpl but is in a directory that // does. Directly copy the file to the destination. sourceFile.copySync(finalDestinationFile.path); }); return fileCount; } } Directory templateDirectoryInPackage(String name) { final String templatesDir = fs.path.join(Cache.flutterRoot, 'packages', 'flutter_tools', 'templates'); return fs.directory(fs.path.join(templatesDir, name)); }