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intl/lib/generate_localized.dart

Index: intl/lib/generate_localized.dart
diff --git a/intl/lib/generate_localized.dart b/intl/lib/generate_localized.dart
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--- a/intl/lib/generate_localized.dart
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-// Copyright (c) 2013, 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 file.
-
-/**
- * This provides utilities for generating localized versions of
- * messages. It does not stand alone, but expects to be given
- * TranslatedMessage objects and generate code for a particular locale
- * based on them.
- *
- * An example of usage can be found
- * in test/message_extract/generate_from_json.dart
- */
-library generate_localized;
-
-import 'intl.dart';
-import 'src/intl_message.dart';
-import 'dart:io';
-import 'package:path/path.dart' as path;
-
-/**
- * If the import path following package: is something else, modify the
- * [intlImportPath] variable to change the import directives in the generated
- * code.
- */
-var intlImportPath = 'intl';
-
-/**
- * If the path to the generated files is something other than the current
- * directory, update the [generatedImportPath] variable to change the import
- * directives in the generated code.
- */
-var generatedImportPath = '';
-
-/**
- * Given a base file, return the file prefixed with the path to import it.
- * By default, that is in the current directory, but if [generatedImportPath]
- * has been set, then use that as a prefix.
- */
-String importForGeneratedFile(String file) =>
-    generatedImportPath.isEmpty ? file : "$generatedImportPath/$file";
-
-/**
- * A list of all the locales for which we have translations. Code that does
- * the reading of translations should add to this.
- */
-List<String> allLocales = [];
-
-/**
- * If we have more than one set of messages to generate in a particular
- * directory we may want to prefix some to distinguish them.
- */
-String generatedFilePrefix = '';
-
-/**
- * Should we use deferred loading for the generated libraries.
- */
-bool useDeferredLoading = true;
-
-/**
- * This represents a message and its translation. We assume that the translation
- * has some identifier that allows us to figure out the original message it
- * corresponds to, and that it may want to transform the translated text in
- * some way, e.g. to turn whatever format the translation uses for variables
- * into a Dart string interpolation. Specific translation
- * mechanisms are expected to subclass this.
- */
-abstract class TranslatedMessage {
-  /**
-   * The identifier for this message. In the simplest case, this is the name
-   * parameter from the Intl.message call,
-   * but it can be any identifier that this program and the output of the
-   * translation can agree on as identifying a message.
-   */
-  final String id;
-
-  /** Our translated version of all the [originalMessages]. */
-  final Message translated;
-
-  /**
-   * The original messages that we are a translation of. There can
-   *  be more than one original message for the same translation.
-   */
-  List<MainMessage> originalMessages;
-
-  /**
-   * For backward compatibility, we still have the originalMessage API.
-   */
-  MainMessage get originalMessage => originalMessages.first;
-  set originalMessage(MainMessage m) => originalMessages = [m];
-
-  TranslatedMessage(this.id, this.translated);
-
-  Message get message => translated;
-
-  toString() => id.toString();
-}
-
-/**
- * We can't use a hyphen in a Dart library name, so convert the locale
- * separator to an underscore.
- */
-String _libraryName(String x) => 'messages_' + x.replaceAll('-', '_');
-
-/**
- * Generate a file <[generated_file_prefix]>_messages_<[locale]>.dart
- * for the [translations] in [locale] and put it in [targetDir].
- */
-void generateIndividualMessageFile(String basicLocale,
-    Iterable<TranslatedMessage> translations, String targetDir) {
-  var result = new StringBuffer();
-  var locale = new MainMessage()
-      .escapeAndValidateString(Intl.canonicalizedLocale(basicLocale));
-  result.write(prologue(locale));
-  // Exclude messages with no translation and translations with no matching
-  // original message (e.g. if we're using some messages from a larger catalog)
-  var usableTranslations = translations
-      .where((each) => each.originalMessages != null && each.message != null)
-      .toList();
-  for (var each in usableTranslations) {
-    for (var original in each.originalMessages) {
-      original.addTranslation(locale, each.message);
-    }
-  }
-  usableTranslations.sort((a, b) =>
-      a.originalMessages.first.name.compareTo(b.originalMessages.first.name));
-  for (var translation in usableTranslations) {
-    for (var original in translation.originalMessages) {
-      result
-        ..write("  ")
-        ..write(original.toCodeForLocale(locale))
-        ..write("\n\n");
-    }
-  }
-  result.write("\n  final messages = const {\n");
-  var entries = usableTranslations
-      .expand((translation) => translation.originalMessages)
-      .map((original) => original.name)
-      .map((name) => "    \"$name\" : $name");
-  result
-    ..write(entries.join(",\n"))
-    ..write("\n  };\n}");
-
-  // To preserve compatibility, we don't use the canonical version of the locale
-  // in the file name.
-  var filename =
-      path.join(targetDir, "${generatedFilePrefix}messages_$basicLocale.dart");
-  new File(filename).writeAsStringSync(result.toString());
-}
-
-/**
- * This returns the mostly constant string used in
- * [generateIndividualMessageFile] for the beginning of the file,
- * parameterized by [locale].
- */
-String prologue(String locale) => """
-/**
- * DO NOT EDIT. This is code generated via package:intl/generate_localized.dart
- * This is a library that provides messages for a $locale locale. All the
- * messages from the main program should be duplicated here with the same
- * function name.
- */
-
-library ${_libraryName(locale)};
-import 'package:$intlImportPath/intl.dart';
-import 'package:$intlImportPath/message_lookup_by_library.dart';
-
-final messages = new MessageLookup();
-
-class MessageLookup extends MessageLookupByLibrary {
-
-  get localeName => '$locale';
-""";
-
-/**
- * This section generates the messages_all.dart file based on the list of
- * [allLocales].
- */
-String generateMainImportFile() {
-  var output = new StringBuffer();
-  output.write(mainPrologue);
-  for (var locale in allLocales) {
-    var baseFile = '${generatedFilePrefix}messages_$locale.dart';
-    var file = importForGeneratedFile(baseFile);
-    output.write("import '$file' ");
-    if (useDeferredLoading) output.write("deferred ");
-    output.write("as ${_libraryName(locale)};\n");
-  }
-  output.write("\n");
-  output.write("\nMap<String, Function> _deferredLibraries = {\n");
-  for (var rawLocale in allLocales) {
-    var locale = Intl.canonicalizedLocale(rawLocale);
-    var loadOperation = (useDeferredLoading)
-        ? "  '$locale' : () => ${_libraryName(locale)}.loadLibrary(),\n"
-        : "  '$locale' : () => new Future.value(null),\n";
-    output.write(loadOperation);
-  }
-  output.write("};\n");
-  output.write("\nMessageLookupByLibrary _findExact(localeName) {\n"
-      "  switch (localeName) {\n");
-  for (var rawLocale in allLocales) {
-    var locale = Intl.canonicalizedLocale(rawLocale);
-    output.write(
-        "    case '$locale' : return ${_libraryName(locale)}.messages;\n");
-  }
-  output.write(closing);
-  return output.toString();
-}
-
-/**
- * Constant string used in [generateMainImportFile] for the beginning of the
- * file.
- */
-var mainPrologue = """
-/**
- * DO NOT EDIT. This is code generated via package:intl/generate_localized.dart
- * This is a library that looks up messages for specific locales by
- * delegating to the appropriate library.
- */
-
-library messages_all;
-
-import 'dart:async';
-import 'package:$intlImportPath/message_lookup_by_library.dart';
-import 'package:$intlImportPath/src/intl_helpers.dart';
-import 'package:$intlImportPath/intl.dart';
-
-""";
-
-/**
- * Constant string used in [generateMainImportFile] as the end of the file.
- */
-const closing = """
-    default: return null;
-  }
-}
-
-/** User programs should call this before using [localeName] for messages.*/
-Future initializeMessages(String localeName) {
-  initializeInternalMessageLookup(() => new CompositeMessageLookup());
-  var lib = _deferredLibraries[Intl.canonicalizedLocale(localeName)];
-  var load = lib == null ? new Future.value(false) : lib();
-  return load.then((_) =>
-      messageLookup.addLocale(localeName, _findGeneratedMessagesFor));
-}
-
-MessageLookupByLibrary _findGeneratedMessagesFor(locale) {
-  var actualLocale = Intl.verifiedLocale(locale, (x) => _findExact(x) != null,
-      onFailure: (_) => null);
-  if (actualLocale == null) return null;
-  return _findExact(actualLocale);
-}
-""";