@angular/compiler
Version:
Angular - the compiler library
155 lines • 25.9 kB
JavaScript
/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { MissingTranslationStrategy } from '../core';
import { HtmlParser } from '../ml_parser/html_parser';
import { I18nError } from './parse_util';
import { escapeXml } from './serializers/xml_helper';
/**
* A container for translated messages
*/
export class TranslationBundle {
constructor(_i18nNodesByMsgId = {}, locale, digest, mapperFactory, missingTranslationStrategy = MissingTranslationStrategy.Warning, console) {
this._i18nNodesByMsgId = _i18nNodesByMsgId;
this.digest = digest;
this.mapperFactory = mapperFactory;
this._i18nToHtml = new I18nToHtmlVisitor(_i18nNodesByMsgId, locale, digest, mapperFactory, missingTranslationStrategy, console);
}
// Creates a `TranslationBundle` by parsing the given `content` with the `serializer`.
static load(content, url, serializer, missingTranslationStrategy, console) {
const { locale, i18nNodesByMsgId } = serializer.load(content, url);
const digestFn = (m) => serializer.digest(m);
const mapperFactory = (m) => serializer.createNameMapper(m);
return new TranslationBundle(i18nNodesByMsgId, locale, digestFn, mapperFactory, missingTranslationStrategy, console);
}
// Returns the translation as HTML nodes from the given source message.
get(srcMsg) {
const html = this._i18nToHtml.convert(srcMsg);
if (html.errors.length) {
throw new Error(html.errors.join('\n'));
}
return html.nodes;
}
has(srcMsg) { return this.digest(srcMsg) in this._i18nNodesByMsgId; }
}
class I18nToHtmlVisitor {
constructor(_i18nNodesByMsgId = {}, _locale, _digest, _mapperFactory, _missingTranslationStrategy, _console) {
this._i18nNodesByMsgId = _i18nNodesByMsgId;
this._locale = _locale;
this._digest = _digest;
this._mapperFactory = _mapperFactory;
this._missingTranslationStrategy = _missingTranslationStrategy;
this._console = _console;
this._contextStack = [];
this._errors = [];
}
convert(srcMsg) {
this._contextStack.length = 0;
this._errors.length = 0;
// i18n to text
const text = this._convertToText(srcMsg);
// text to html
const url = srcMsg.nodes[0].sourceSpan.start.file.url;
const html = new HtmlParser().parse(text, url, true);
return {
nodes: html.rootNodes,
errors: [...this._errors, ...html.errors],
};
}
visitText(text, context) {
// `convert()` uses an `HtmlParser` to return `html.Node`s
// we should then make sure that any special characters are escaped
return escapeXml(text.value);
}
visitContainer(container, context) {
return container.children.map(n => n.visit(this)).join('');
}
visitIcu(icu, context) {
const cases = Object.keys(icu.cases).map(k => `${k} {${icu.cases[k].visit(this)}}`);
// TODO(vicb): Once all format switch to using expression placeholders
// we should throw when the placeholder is not in the source message
const exp = this._srcMsg.placeholders.hasOwnProperty(icu.expression) ?
this._srcMsg.placeholders[icu.expression] :
icu.expression;
return `{${exp}, ${icu.type}, ${cases.join(' ')}}`;
}
visitPlaceholder(ph, context) {
const phName = this._mapper(ph.name);
if (this._srcMsg.placeholders.hasOwnProperty(phName)) {
return this._srcMsg.placeholders[phName];
}
if (this._srcMsg.placeholderToMessage.hasOwnProperty(phName)) {
return this._convertToText(this._srcMsg.placeholderToMessage[phName]);
}
this._addError(ph, `Unknown placeholder "${ph.name}"`);
return '';
}
// Loaded message contains only placeholders (vs tag and icu placeholders).
// However when a translation can not be found, we need to serialize the source message
// which can contain tag placeholders
visitTagPlaceholder(ph, context) {
const tag = `${ph.tag}`;
const attrs = Object.keys(ph.attrs).map(name => `${name}="${ph.attrs[name]}"`).join(' ');
if (ph.isVoid) {
return `<${tag} ${attrs}/>`;
}
const children = ph.children.map((c) => c.visit(this)).join('');
return `<${tag} ${attrs}>${children}</${tag}>`;
}
// Loaded message contains only placeholders (vs tag and icu placeholders).
// However when a translation can not be found, we need to serialize the source message
// which can contain tag placeholders
visitIcuPlaceholder(ph, context) {
// An ICU placeholder references the source message to be serialized
return this._convertToText(this._srcMsg.placeholderToMessage[ph.name]);
}
/**
* Convert a source message to a translated text string:
* - text nodes are replaced with their translation,
* - placeholders are replaced with their content,
* - ICU nodes are converted to ICU expressions.
*/
_convertToText(srcMsg) {
const id = this._digest(srcMsg);
const mapper = this._mapperFactory ? this._mapperFactory(srcMsg) : null;
let nodes;
this._contextStack.push({ msg: this._srcMsg, mapper: this._mapper });
this._srcMsg = srcMsg;
if (this._i18nNodesByMsgId.hasOwnProperty(id)) {
// When there is a translation use its nodes as the source
// And create a mapper to convert serialized placeholder names to internal names
nodes = this._i18nNodesByMsgId[id];
this._mapper = (name) => mapper ? mapper.toInternalName(name) : name;
}
else {
// When no translation has been found
// - report an error / a warning / nothing,
// - use the nodes from the original message
// - placeholders are already internal and need no mapper
if (this._missingTranslationStrategy === MissingTranslationStrategy.Error) {
const ctx = this._locale ? ` for locale "${this._locale}"` : '';
this._addError(srcMsg.nodes[0], `Missing translation for message "${id}"${ctx}`);
}
else if (this._console &&
this._missingTranslationStrategy === MissingTranslationStrategy.Warning) {
const ctx = this._locale ? ` for locale "${this._locale}"` : '';
this._console.warn(`Missing translation for message "${id}"${ctx}`);
}
nodes = srcMsg.nodes;
this._mapper = (name) => name;
}
const text = nodes.map(node => node.visit(this)).join('');
const context = this._contextStack.pop();
this._srcMsg = context.msg;
this._mapper = context.mapper;
return text;
}
_addError(el, msg) {
this._errors.push(new I18nError(el.sourceSpan, msg));
}
}
//# 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* @license\n * Copyright Google Inc. All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {MissingTranslationStrategy} from '../core';\nimport * as html from '../ml_parser/ast';\nimport {HtmlParser} from '../ml_parser/html_parser';\nimport {Console} from '../util';\n\nimport * as i18n from './i18n_ast';\nimport {I18nError} from './parse_util';\nimport {PlaceholderMapper, Serializer} from './serializers/serializer';\nimport {escapeXml} from './serializers/xml_helper';\n\n\n/**\n * A container for translated messages\n */\nexport class TranslationBundle {\n  private _i18nToHtml: I18nToHtmlVisitor;\n\n  constructor(\n      private _i18nNodesByMsgId: {[msgId: string]: i18n.Node[]} = {}, locale: string|null,\n      public digest: (m: i18n.Message) => string,\n      public mapperFactory?: (m: i18n.Message) => PlaceholderMapper,\n      missingTranslationStrategy: MissingTranslationStrategy = MissingTranslationStrategy.Warning,\n      console?: Console) {\n    this._i18nToHtml = new I18nToHtmlVisitor(\n        _i18nNodesByMsgId, locale, digest, mapperFactory !, missingTranslationStrategy, console);\n  }\n\n  // Creates a `TranslationBundle` by parsing the given `content` with the `serializer`.\n  static load(\n      content: string, url: string, serializer: Serializer,\n      missingTranslationStrategy: MissingTranslationStrategy,\n      console?: Console): TranslationBundle {\n    const {locale, i18nNodesByMsgId} = serializer.load(content, url);\n    const digestFn = (m: i18n.Message) => serializer.digest(m);\n    const mapperFactory = (m: i18n.Message) => serializer.createNameMapper(m) !;\n    return new TranslationBundle(\n        i18nNodesByMsgId, locale, digestFn, mapperFactory, missingTranslationStrategy, console);\n  }\n\n  // Returns the translation as HTML nodes from the given source message.\n  get(srcMsg: i18n.Message): html.Node[] {\n    const html = this._i18nToHtml.convert(srcMsg);\n\n    if (html.errors.length) {\n      throw new Error(html.errors.join('\\n'));\n    }\n\n    return html.nodes;\n  }\n\n  has(srcMsg: i18n.Message): boolean { return this.digest(srcMsg) in this._i18nNodesByMsgId; }\n}\n\nclass I18nToHtmlVisitor implements i18n.Visitor {\n  // TODO(issue/24571): remove '!'.\n  private _srcMsg !: i18n.Message;\n  private _contextStack: {msg: i18n.Message, mapper: (name: string) => string}[] = [];\n  private _errors: I18nError[] = [];\n  // TODO(issue/24571): remove '!'.\n  private _mapper !: (name: string) => string;\n\n  constructor(\n      private _i18nNodesByMsgId: {[msgId: string]: i18n.Node[]} = {}, private _locale: string|null,\n      private _digest: (m: i18n.Message) => string,\n      private _mapperFactory: (m: i18n.Message) => PlaceholderMapper,\n      private _missingTranslationStrategy: MissingTranslationStrategy, private _console?: Console) {\n  }\n\n  convert(srcMsg: i18n.Message): {nodes: html.Node[], errors: I18nError[]} {\n    this._contextStack.length = 0;\n    this._errors.length = 0;\n\n    // i18n to text\n    const text = this._convertToText(srcMsg);\n\n    // text to html\n    const url = srcMsg.nodes[0].sourceSpan.start.file.url;\n    const html = new HtmlParser().parse(text, url, true);\n\n    return {\n      nodes: html.rootNodes,\n      errors: [...this._errors, ...html.errors],\n    };\n  }\n\n  visitText(text: i18n.Text, context?: any): string {\n    // `convert()` uses an `HtmlParser` to return `html.Node`s\n    // we should then make sure that any special characters are escaped\n    return escapeXml(text.value);\n  }\n\n  visitContainer(container: i18n.Container, context?: any): any {\n    return container.children.map(n => n.visit(this)).join('');\n  }\n\n  visitIcu(icu: i18n.Icu, context?: any): any {\n    const cases = Object.keys(icu.cases).map(k => `${k} {${icu.cases[k].visit(this)}}`);\n\n    // TODO(vicb): Once all format switch to using expression placeholders\n    // we should throw when the placeholder is not in the source message\n    const exp = this._srcMsg.placeholders.hasOwnProperty(icu.expression) ?\n        this._srcMsg.placeholders[icu.expression] :\n        icu.expression;\n\n    return `{${exp}, ${icu.type}, ${cases.join(' ')}}`;\n  }\n\n  visitPlaceholder(ph: i18n.Placeholder, context?: any): string {\n    const phName = this._mapper(ph.name);\n    if (this._srcMsg.placeholders.hasOwnProperty(phName)) {\n      return this._srcMsg.placeholders[phName];\n    }\n\n    if (this._srcMsg.placeholderToMessage.hasOwnProperty(phName)) {\n      return this._convertToText(this._srcMsg.placeholderToMessage[phName]);\n    }\n\n    this._addError(ph, `Unknown placeholder \"${ph.name}\"`);\n    return '';\n  }\n\n  // Loaded message contains only placeholders (vs tag and icu placeholders).\n  // However when a translation can not be found, we need to serialize the source message\n  // which can contain tag placeholders\n  visitTagPlaceholder(ph: i18n.TagPlaceholder, context?: any): string {\n    const tag = `${ph.tag}`;\n    const attrs = Object.keys(ph.attrs).map(name => `${name}=\"${ph.attrs[name]}\"`).join(' ');\n    if (ph.isVoid) {\n      return `<${tag} ${attrs}/>`;\n    }\n    const children = ph.children.map((c: i18n.Node) => c.visit(this)).join('');\n    return `<${tag} ${attrs}>${children}</${tag}>`;\n  }\n\n  // Loaded message contains only placeholders (vs tag and icu placeholders).\n  // However when a translation can not be found, we need to serialize the source message\n  // which can contain tag placeholders\n  visitIcuPlaceholder(ph: i18n.IcuPlaceholder, context?: any): string {\n    // An ICU placeholder references the source message to be serialized\n    return this._convertToText(this._srcMsg.placeholderToMessage[ph.name]);\n  }\n\n  /**\n   * Convert a source message to a translated text string:\n   * - text nodes are replaced with their translation,\n   * - placeholders are replaced with their content,\n   * - ICU nodes are converted to ICU expressions.\n   */\n  private _convertToText(srcMsg: i18n.Message): string {\n    const id = this._digest(srcMsg);\n    const mapper = this._mapperFactory ? this._mapperFactory(srcMsg) : null;\n    let nodes: i18n.Node[];\n\n    this._contextStack.push({msg: this._srcMsg, mapper: this._mapper});\n    this._srcMsg = srcMsg;\n\n    if (this._i18nNodesByMsgId.hasOwnProperty(id)) {\n      // When there is a translation use its nodes as the source\n      // And create a mapper to convert serialized placeholder names to internal names\n      nodes = this._i18nNodesByMsgId[id];\n      this._mapper = (name: string) => mapper ? mapper.toInternalName(name) ! : name;\n    } else {\n      // When no translation has been found\n      // - report an error / a warning / nothing,\n      // - use the nodes from the original message\n      // - placeholders are already internal and need no mapper\n      if (this._missingTranslationStrategy === MissingTranslationStrategy.Error) {\n        const ctx = this._locale ? ` for locale \"${this._locale}\"` : '';\n        this._addError(srcMsg.nodes[0], `Missing translation for message \"${id}\"${ctx}`);\n      } else if (\n          this._console &&\n          this._missingTranslationStrategy === MissingTranslationStrategy.Warning) {\n        const ctx = this._locale ? ` for locale \"${this._locale}\"` : '';\n        this._console.warn(`Missing translation for message \"${id}\"${ctx}`);\n      }\n      nodes = srcMsg.nodes;\n      this._mapper = (name: string) => name;\n    }\n    const text = nodes.map(node => node.visit(this)).join('');\n    const context = this._contextStack.pop() !;\n    this._srcMsg = context.msg;\n    this._mapper = context.mapper;\n    return text;\n  }\n\n  private _addError(el: i18n.Node, msg: string) {\n    this._errors.push(new I18nError(el.sourceSpan, msg));\n  }\n}\n"]}