packages/flutter_tools/lib/src/template.dart - external/github.com/flutter/flutter - Git at Google

 // 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 'package:package_config/package_config.dart';
 import 'package:package_config/package_config_types.dart';

 import 'base/common.dart';
 import 'base/file_system.dart';
 import 'base/logger.dart';
 import 'base/template.dart';
 import 'cache.dart';
 import 'dart/package_map.dart';
 import 'dart/pub.dart';

 /// Expands templates in a directory to a destination. All files that must
 /// undergo template expansion should end with the '.tmpl' extension. All files
 /// that should be replaced with the corresponding image from
 /// flutter_template_images should end with the '.img.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' or '.img.tmpl' extensions and
 /// will be considered for expansion. In case certain files need to be copied
 /// but without template expansion (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',
 /// 'img.tmpl', or '-<language>.tmpl' extensions.
 class Template {
   Template(Directory templateSource, Directory baseDir, this.imageSourceDir, {
     @required FileSystem fileSystem,
     @required Logger logger,
     @required TemplateRenderer templateRenderer,
     @required Set<Uri> templateManifest,
   }) : _fileSystem = fileSystem,
        _logger = logger,
        _templateRenderer = templateRenderer,
        _templateManifest = templateManifest {
     _templateFilePaths = <String, String>{};

     if (!templateSource.existsSync()) {
       return;
     }

     final List<FileSystemEntity> templateFiles = templateSource.listSync(recursive: true);
     for (final FileSystemEntity entity in templateFiles.whereType<File>()) {
       if (_templateManifest != null && !_templateManifest.contains(Uri.file(entity.absolute.path))) {
         _logger.printTrace('Skipping ${entity.absolute.path}, missing from the template manifest.');
         // Skip stale files in the flutter_tools directory.
         continue;
       }

       final String relativePath = fileSystem.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] = fileSystem.path.absolute(entity.path);
       }
     }
   }

   static Future<Template> fromName(String name, {
     @required FileSystem fileSystem,
     @required Set<Uri> templateManifest,
     @required Logger logger,
     @required TemplateRenderer templateRenderer,
     @required Pub pub,
   }) async {
     // All named templates are placed in the 'templates' directory
     final Directory templateDir = _templateDirectoryInPackage(name, fileSystem);
     final Directory imageDir = await _templateImageDirectory(name, fileSystem, logger, pub);
     return Template(
       templateDir,
       templateDir, imageDir,
       fileSystem: fileSystem,
       logger: logger,
       templateRenderer: templateRenderer,
       templateManifest: templateManifest,
     );
   }

   final FileSystem _fileSystem;
   final Logger _logger;
   final Set<Uri> _templateManifest;
   final TemplateRenderer _templateRenderer;

   static const String templateExtension = '.tmpl';
   static const String copyTemplateExtension = '.copy.tmpl';
   static const String imageTemplateExtension = '.img.tmpl';
   final Pattern _kTemplateLanguageVariant = RegExp(r'(\w+)-(\w+)\.tmpl.*');
   final Directory imageSourceDir;

   Map<String /* relative */, String /* absolute source */> _templateFilePaths;

   /// Render the template into [directory].
   ///
   /// May throw a [ToolExit] if the directory is not writable.
   int render(
     Directory destination,
     Map<String, dynamic> context, {
     bool overwriteExisting = true,
     bool printStatusWhenWriting = true,
   }) {
     try {
       destination.createSync(recursive: true);
     } on FileSystemException catch (err) {
       _logger.printError(err.toString());
       throwToolExit('Failed to flutter create at ${destination.path}.');
       return 0;
     }
     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['${platform}Language'] as String;
         if (language != match.group(2)) {
           return null;
         }
         relativeDestinationPath = relativeDestinationPath.replaceAll('$platform-$language.tmpl', platform);
       }

       final bool android = context['android'] as bool;
       if (relativeDestinationPath.contains('android') && !android) {
         return null;
       }

       final bool ios = context['ios'] as bool;
       if (relativeDestinationPath.contains('ios') && !ios) {
         return null;
       }

       // Only build a web project if explicitly asked.
       final bool web = context['web'] as bool;
       if (relativeDestinationPath.contains('web') && !web) {
         return null;
       }
       // Only build a Linux project if explicitly asked.
       final bool linux = context['linux'] as bool;
       if (relativeDestinationPath.startsWith('linux.tmpl') && !linux) {
         return null;
       }
       // Only build a macOS project if explicitly asked.
       final bool macOS = context['macos'] as bool;
       if (relativeDestinationPath.startsWith('macos.tmpl') && !macOS) {
         return null;
       }
       // Only build a Windows project if explicitly asked.
       final bool windows = context['windows'] as bool;
       if (relativeDestinationPath.startsWith('windows.tmpl') && !windows) {
         return null;
       }

       final String projectName = context['projectName'] as String;
       final String androidIdentifier = context['androidIdentifier'] as String;
       final String pluginClass = context['pluginClass'] as String;
       final String pluginClassSnakeCase = context['pluginClassSnakeCase'] as String;
       final String destinationDirPath = destination.absolute.path;
       final String pathSeparator = _fileSystem.path.separator;
       String finalDestinationPath = _fileSystem.path
         .join(destinationDirPath, relativeDestinationPath)
         .replaceAll(copyTemplateExtension, '')
         .replaceAll(imageTemplateExtension, '')
         .replaceAll(templateExtension, '');

       if (android != null && android && androidIdentifier != null) {
         finalDestinationPath = finalDestinationPath
             .replaceAll('androidIdentifier', androidIdentifier.replaceAll('.', pathSeparator));
       }
       if (projectName != null) {
         finalDestinationPath = finalDestinationPath.replaceAll('projectName', projectName);
       }
       // This must be before the pluginClass replacement step.
       if (pluginClassSnakeCase != null) {
         finalDestinationPath = finalDestinationPath.replaceAll('pluginClassSnakeCase', pluginClassSnakeCase);
       }
       if (pluginClass != null) {
         finalDestinationPath = finalDestinationPath.replaceAll('pluginClass', pluginClass);
       }
       return finalDestinationPath;
     }

     _templateFilePaths.forEach((String relativeDestinationPath, String absoluteSourcePath) {
       final bool withRootModule = context['withRootModule'] as bool ?? false;
       if (!withRootModule && absoluteSourcePath.contains('flutter_root')) {
         return;
       }

       final String finalDestinationPath = renderPath(relativeDestinationPath);
       if (finalDestinationPath == null) {
         return;
       }
       final File finalDestinationFile = _fileSystem.file(finalDestinationPath);
       final String relativePathForLogging = _fileSystem.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) {
             _logger.printStatus('  $relativePathForLogging (overwritten)');
           }
         } else {
           // The file exists but we cannot overwrite it, move on.
           if (printStatusWhenWriting) {
             _logger.printTrace('  $relativePathForLogging (existing - skipped)');
           }
           return;
         }
       } else {
         if (printStatusWhenWriting) {
           _logger.printStatus('  $relativePathForLogging (created)');
         }
       }

       fileCount += 1;

       finalDestinationFile.createSync(recursive: true);
       final File sourceFile = _fileSystem.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)) {
         _validateReadPermissions(sourceFile);
         sourceFile.copySync(finalDestinationFile.path);

         return;
       }

       // Step 3: If the absolute paths ends with a '.img.tmpl', this file needs
       //         to be copied from the template image package.

       if (sourceFile.path.endsWith(imageTemplateExtension)) {
         final File imageSourceFile = _fileSystem.file(_fileSystem.path.join(
             imageSourceDir.path, relativeDestinationPath.replaceAll(imageTemplateExtension, '')));
         _validateReadPermissions(imageSourceFile);
         imageSourceFile.copySync(finalDestinationFile.path);

         return;
       }

       // Step 4: If the absolute path ends with a '.tmpl', this file needs
       //         rendering via mustache.

       if (sourceFile.path.endsWith(templateExtension)) {
          _validateReadPermissions(sourceFile);
         final String templateContents = sourceFile.readAsStringSync();
         final String renderedContents = _templateRenderer.renderString(templateContents, context);

         finalDestinationFile.writeAsStringSync(renderedContents);

         return;
       }

       // Step 5: This file does not end in .tmpl but is in a directory that
       //         does. Directly copy the file to the destination.
       _validateReadPermissions(sourceFile);
       sourceFile.copySync(finalDestinationFile.path);
     });

     return fileCount;
   }

   /// Attempt open/close the file to ensure that read permissions are correct.
   ///
   /// If this fails with a certain error code, the [ErrorHandlingFileSystem] will
   /// trigger a tool exit with a better message.
   void _validateReadPermissions(File file) {
     file.openSync().closeSync();
   }
 }

 Directory _templateDirectoryInPackage(String name, FileSystem fileSystem) {
   final String templatesDir = fileSystem.path.join(Cache.flutterRoot,
       'packages', 'flutter_tools', 'templates');
   return fileSystem.directory(fileSystem.path.join(templatesDir, name));
 }

 // Returns the directory containing the 'name' template directory in
 // flutter_template_images, to resolve image placeholder against.
 Future<Directory> _templateImageDirectory(String name, FileSystem fileSystem, Logger logger, Pub pub) async {
   final String toolPackagePath = fileSystem.path.join(
       Cache.flutterRoot, 'packages', 'flutter_tools');
   final String packageFilePath = fileSystem.path.join(toolPackagePath, kPackagesFileName);
   final PackageConfig packageConfig = await loadPackageConfigWithLogging(
     fileSystem.file(packageFilePath),
     logger: logger,
   );
   final Uri imagePackageLibDir = packageConfig['flutter_template_images']?.packageUriRoot;
   return fileSystem.directory(imagePackageLibDir)
       .parent
       .childDirectory('templates')
       .childDirectory(name);
 }
	// 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 'package:package_config/package_config.dart';
	import 'package:package_config/package_config_types.dart';

	import 'base/common.dart';
	import 'base/file_system.dart';
	import 'base/logger.dart';
	import 'base/template.dart';
	import 'cache.dart';
	import 'dart/package_map.dart';
	import 'dart/pub.dart';

	/// Expands templates in a directory to a destination. All files that must
	/// undergo template expansion should end with the '.tmpl' extension. All files
	/// that should be replaced with the corresponding image from
	/// flutter_template_images should end with the '.img.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' or '.img.tmpl' extensions and
	/// will be considered for expansion. In case certain files need to be copied
	/// but without template expansion (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',
	/// 'img.tmpl', or '-<language>.tmpl' extensions.
	class Template {
	Template(Directory templateSource, Directory baseDir, this.imageSourceDir, {
	@required FileSystem fileSystem,
	@required Logger logger,
	@required TemplateRenderer templateRenderer,
	@required Set<Uri> templateManifest,
	}) : _fileSystem = fileSystem,
	_logger = logger,
	_templateRenderer = templateRenderer,
	_templateManifest = templateManifest {
	_templateFilePaths = <String, String>{};

	if (!templateSource.existsSync()) {
	return;
	}

	final List<FileSystemEntity> templateFiles = templateSource.listSync(recursive: true);
	for (final FileSystemEntity entity in templateFiles.whereType<File>()) {
	if (_templateManifest != null && !_templateManifest.contains(Uri.file(entity.absolute.path))) {
	_logger.printTrace('Skipping ${entity.absolute.path}, missing from the template manifest.');
	// Skip stale files in the flutter_tools directory.
	continue;
	}

	final String relativePath = fileSystem.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] = fileSystem.path.absolute(entity.path);
	}
	}
	}

	static Future<Template> fromName(String name, {
	@required FileSystem fileSystem,
	@required Set<Uri> templateManifest,
	@required Logger logger,
	@required TemplateRenderer templateRenderer,
	@required Pub pub,
	}) async {
	// All named templates are placed in the 'templates' directory
	final Directory templateDir = _templateDirectoryInPackage(name, fileSystem);
	final Directory imageDir = await _templateImageDirectory(name, fileSystem, logger, pub);
	return Template(
	templateDir,
	templateDir, imageDir,
	fileSystem: fileSystem,
	logger: logger,
	templateRenderer: templateRenderer,
	templateManifest: templateManifest,
	);
	}

	final FileSystem _fileSystem;
	final Logger _logger;
	final Set<Uri> _templateManifest;
	final TemplateRenderer _templateRenderer;

	static const String templateExtension = '.tmpl';
	static const String copyTemplateExtension = '.copy.tmpl';
	static const String imageTemplateExtension = '.img.tmpl';
	final Pattern _kTemplateLanguageVariant = RegExp(r'(\w+)-(\w+)\.tmpl.*');
	final Directory imageSourceDir;

	Map<String /* relative /, String / absolute source */> _templateFilePaths;

	/// Render the template into [directory].
	///
	/// May throw a [ToolExit] if the directory is not writable.
	int render(
	Directory destination,
	Map<String, dynamic> context, {
	bool overwriteExisting = true,
	bool printStatusWhenWriting = true,
	}) {
	try {
	destination.createSync(recursive: true);
	} on FileSystemException catch (err) {
	_logger.printError(err.toString());
	throwToolExit('Failed to flutter create at ${destination.path}.');
	return 0;
	}
	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['${platform}Language'] as String;
	if (language != match.group(2)) {
	return null;
	}
	relativeDestinationPath = relativeDestinationPath.replaceAll('$platform-$language.tmpl', platform);
	}

	final bool android = context['android'] as bool;
	if (relativeDestinationPath.contains('android') && !android) {
	return null;
	}

	final bool ios = context['ios'] as bool;
	if (relativeDestinationPath.contains('ios') && !ios) {
	return null;
	}

	// Only build a web project if explicitly asked.
	final bool web = context['web'] as bool;
	if (relativeDestinationPath.contains('web') && !web) {
	return null;
	}
	// Only build a Linux project if explicitly asked.
	final bool linux = context['linux'] as bool;
	if (relativeDestinationPath.startsWith('linux.tmpl') && !linux) {
	return null;
	}
	// Only build a macOS project if explicitly asked.
	final bool macOS = context['macos'] as bool;
	if (relativeDestinationPath.startsWith('macos.tmpl') && !macOS) {
	return null;
	}
	// Only build a Windows project if explicitly asked.
	final bool windows = context['windows'] as bool;
	if (relativeDestinationPath.startsWith('windows.tmpl') && !windows) {
	return null;
	}

	final String projectName = context['projectName'] as String;
	final String androidIdentifier = context['androidIdentifier'] as String;
	final String pluginClass = context['pluginClass'] as String;
	final String pluginClassSnakeCase = context['pluginClassSnakeCase'] as String;
	final String destinationDirPath = destination.absolute.path;
	final String pathSeparator = _fileSystem.path.separator;
	String finalDestinationPath = _fileSystem.path
	.join(destinationDirPath, relativeDestinationPath)
	.replaceAll(copyTemplateExtension, '')
	.replaceAll(imageTemplateExtension, '')
	.replaceAll(templateExtension, '');

	if (android != null && android && androidIdentifier != null) {
	finalDestinationPath = finalDestinationPath
	.replaceAll('androidIdentifier', androidIdentifier.replaceAll('.', pathSeparator));
	}
	if (projectName != null) {
	finalDestinationPath = finalDestinationPath.replaceAll('projectName', projectName);
	}
	// This must be before the pluginClass replacement step.
	if (pluginClassSnakeCase != null) {
	finalDestinationPath = finalDestinationPath.replaceAll('pluginClassSnakeCase', pluginClassSnakeCase);
	}
	if (pluginClass != null) {
	finalDestinationPath = finalDestinationPath.replaceAll('pluginClass', pluginClass);
	}
	return finalDestinationPath;
	}

	_templateFilePaths.forEach((String relativeDestinationPath, String absoluteSourcePath) {
	final bool withRootModule = context['withRootModule'] as bool ?? false;
	if (!withRootModule && absoluteSourcePath.contains('flutter_root')) {
	return;
	}

	final String finalDestinationPath = renderPath(relativeDestinationPath);
	if (finalDestinationPath == null) {
	return;
	}
	final File finalDestinationFile = _fileSystem.file(finalDestinationPath);
	final String relativePathForLogging = _fileSystem.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) {
	_logger.printStatus(' $relativePathForLogging (overwritten)');
	}
	} else {
	// The file exists but we cannot overwrite it, move on.
	if (printStatusWhenWriting) {
	_logger.printTrace(' $relativePathForLogging (existing - skipped)');
	}
	return;
	}
	} else {
	if (printStatusWhenWriting) {
	_logger.printStatus(' $relativePathForLogging (created)');
	}
	}

	fileCount += 1;

	finalDestinationFile.createSync(recursive: true);
	final File sourceFile = _fileSystem.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)) {
	_validateReadPermissions(sourceFile);
	sourceFile.copySync(finalDestinationFile.path);

	return;
	}

	// Step 3: If the absolute paths ends with a '.img.tmpl', this file needs
	// to be copied from the template image package.

	if (sourceFile.path.endsWith(imageTemplateExtension)) {
	final File imageSourceFile = _fileSystem.file(_fileSystem.path.join(
	imageSourceDir.path, relativeDestinationPath.replaceAll(imageTemplateExtension, '')));
	_validateReadPermissions(imageSourceFile);
	imageSourceFile.copySync(finalDestinationFile.path);

	return;
	}

	// Step 4: If the absolute path ends with a '.tmpl', this file needs
	// rendering via mustache.

	if (sourceFile.path.endsWith(templateExtension)) {
	_validateReadPermissions(sourceFile);
	final String templateContents = sourceFile.readAsStringSync();
	final String renderedContents = _templateRenderer.renderString(templateContents, context);

	finalDestinationFile.writeAsStringSync(renderedContents);

	return;
	}

	// Step 5: This file does not end in .tmpl but is in a directory that
	// does. Directly copy the file to the destination.
	_validateReadPermissions(sourceFile);
	sourceFile.copySync(finalDestinationFile.path);
	});

	return fileCount;
	}

	/// Attempt open/close the file to ensure that read permissions are correct.
	///
	/// If this fails with a certain error code, the [ErrorHandlingFileSystem] will
	/// trigger a tool exit with a better message.
	void _validateReadPermissions(File file) {
	file.openSync().closeSync();
	}
	}

	Directory _templateDirectoryInPackage(String name, FileSystem fileSystem) {
	final String templatesDir = fileSystem.path.join(Cache.flutterRoot,
	'packages', 'flutter_tools', 'templates');
	return fileSystem.directory(fileSystem.path.join(templatesDir, name));
	}

	// Returns the directory containing the 'name' template directory in
	// flutter_template_images, to resolve image placeholder against.
	Future<Directory> _templateImageDirectory(String name, FileSystem fileSystem, Logger logger, Pub pub) async {
	final String toolPackagePath = fileSystem.path.join(
	Cache.flutterRoot, 'packages', 'flutter_tools');
	final String packageFilePath = fileSystem.path.join(toolPackagePath, kPackagesFileName);
	final PackageConfig packageConfig = await loadPackageConfigWithLogging(
	fileSystem.file(packageFilePath),
	logger: logger,
	);
	final Uri imagePackageLibDir = packageConfig['flutter_template_images']?.packageUriRoot;
	return fileSystem.directory(imagePackageLibDir)
	.parent
	.childDirectory('templates')
	.childDirectory(name);
	}