@angular/compiler
Version:
Angular - the compiler library
227 lines • 38.7 kB
JavaScript
/**
* @license
* Copyright Google LLC 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 { Lexer as ExpressionLexer } from '../expression_parser/lexer';
import { Parser as ExpressionParser } from '../expression_parser/parser';
import * as html from '../ml_parser/ast';
import { getHtmlTagDefinition } from '../ml_parser/html_tags';
import { ParseSourceSpan } from '../parse_util';
import * as i18n from './i18n_ast';
import { PlaceholderRegistry } from './serializers/placeholder';
const _expParser = new ExpressionParser(new ExpressionLexer());
/**
* Returns a function converting html nodes to an i18n Message given an interpolationConfig
*/
export function createI18nMessageFactory(interpolationConfig) {
const visitor = new _I18nVisitor(_expParser, interpolationConfig);
return (nodes, meaning, description, customId, visitNodeFn) => visitor.toI18nMessage(nodes, meaning, description, customId, visitNodeFn);
}
function noopVisitNodeFn(_html, i18n) {
return i18n;
}
class _I18nVisitor {
constructor(_expressionParser, _interpolationConfig) {
this._expressionParser = _expressionParser;
this._interpolationConfig = _interpolationConfig;
}
toI18nMessage(nodes, meaning = '', description = '', customId = '', visitNodeFn) {
const context = {
isIcu: nodes.length == 1 && nodes[0] instanceof html.Expansion,
icuDepth: 0,
placeholderRegistry: new PlaceholderRegistry(),
placeholderToContent: {},
placeholderToMessage: {},
visitNodeFn: visitNodeFn || noopVisitNodeFn,
};
const i18nodes = html.visitAll(this, nodes, context);
return new i18n.Message(i18nodes, context.placeholderToContent, context.placeholderToMessage, meaning, description, customId);
}
visitElement(el, context) {
var _a;
const children = html.visitAll(this, el.children, context);
const attrs = {};
el.attrs.forEach(attr => {
// Do not visit the attributes, translatable ones are top-level ASTs
attrs[attr.name] = attr.value;
});
const isVoid = getHtmlTagDefinition(el.name).isVoid;
const startPhName = context.placeholderRegistry.getStartTagPlaceholderName(el.name, attrs, isVoid);
context.placeholderToContent[startPhName] = {
text: el.startSourceSpan.toString(),
sourceSpan: el.startSourceSpan,
};
let closePhName = '';
if (!isVoid) {
closePhName = context.placeholderRegistry.getCloseTagPlaceholderName(el.name);
context.placeholderToContent[closePhName] = {
text: `</${el.name}>`,
sourceSpan: (_a = el.endSourceSpan) !== null && _a !== void 0 ? _a : el.sourceSpan,
};
}
const node = new i18n.TagPlaceholder(el.name, attrs, startPhName, closePhName, children, isVoid, el.sourceSpan, el.startSourceSpan, el.endSourceSpan);
return context.visitNodeFn(el, node);
}
visitAttribute(attribute, context) {
const node = this._visitTextWithInterpolation(attribute.value, attribute.valueSpan || attribute.sourceSpan, context, attribute.i18n);
return context.visitNodeFn(attribute, node);
}
visitText(text, context) {
const node = this._visitTextWithInterpolation(text.value, text.sourceSpan, context, text.i18n);
return context.visitNodeFn(text, node);
}
visitComment(comment, context) {
return null;
}
visitExpansion(icu, context) {
context.icuDepth++;
const i18nIcuCases = {};
const i18nIcu = new i18n.Icu(icu.switchValue, icu.type, i18nIcuCases, icu.sourceSpan);
icu.cases.forEach((caze) => {
i18nIcuCases[caze.value] = new i18n.Container(caze.expression.map((node) => node.visit(this, context)), caze.expSourceSpan);
});
context.icuDepth--;
if (context.isIcu || context.icuDepth > 0) {
// Returns an ICU node when:
// - the message (vs a part of the message) is an ICU message, or
// - the ICU message is nested.
const expPh = context.placeholderRegistry.getUniquePlaceholder(`VAR_${icu.type}`);
i18nIcu.expressionPlaceholder = expPh;
context.placeholderToContent[expPh] = {
text: icu.switchValue,
sourceSpan: icu.switchValueSourceSpan,
};
return context.visitNodeFn(icu, i18nIcu);
}
// Else returns a placeholder
// ICU placeholders should not be replaced with their original content but with the their
// translations.
// TODO(vicb): add a html.Node -> i18n.Message cache to avoid having to re-create the msg
const phName = context.placeholderRegistry.getPlaceholderName('ICU', icu.sourceSpan.toString());
context.placeholderToMessage[phName] = this.toI18nMessage([icu], '', '', '', undefined);
const node = new i18n.IcuPlaceholder(i18nIcu, phName, icu.sourceSpan);
return context.visitNodeFn(icu, node);
}
visitExpansionCase(_icuCase, _context) {
throw new Error('Unreachable code');
}
/**
* Split the, potentially interpolated, text up into text and placeholder pieces.
*
* @param text The potentially interpolated string to be split.
* @param sourceSpan The span of the whole of the `text` string.
* @param context The current context of the visitor, used to compute and store placeholders.
* @param previousI18n Any i18n metadata associated with this `text` from a previous pass.
*/
_visitTextWithInterpolation(text, sourceSpan, context, previousI18n) {
const { strings, expressions } = this._expressionParser.splitInterpolation(text, sourceSpan.start.toString(), this._interpolationConfig);
// No expressions, return a single text.
if (expressions.length === 0) {
return new i18n.Text(text, sourceSpan);
}
// Return a sequence of `Text` and `Placeholder` nodes grouped in a `Container`.
const nodes = [];
for (let i = 0; i < strings.length - 1; i++) {
this._addText(nodes, strings[i], sourceSpan);
this._addPlaceholder(nodes, context, expressions[i], sourceSpan);
}
// The last index contains no expression
this._addText(nodes, strings[strings.length - 1], sourceSpan);
// Whitespace removal may have invalidated the interpolation source-spans.
reusePreviousSourceSpans(nodes, previousI18n);
return new i18n.Container(nodes, sourceSpan);
}
/**
* Create a new `Text` node from the `textPiece` and add it to the `nodes` collection.
*
* @param nodes The nodes to which the created `Text` node should be added.
* @param textPiece The text and relative span information for this `Text` node.
* @param interpolationSpan The span of the whole interpolated text.
*/
_addText(nodes, textPiece, interpolationSpan) {
if (textPiece.text.length > 0) {
// No need to add empty strings
const stringSpan = getOffsetSourceSpan(interpolationSpan, textPiece);
nodes.push(new i18n.Text(textPiece.text, stringSpan));
}
}
/**
* Create a new `Placeholder` node from the `expression` and add it to the `nodes` collection.
*
* @param nodes The nodes to which the created `Text` node should be added.
* @param context The current context of the visitor, used to compute and store placeholders.
* @param expression The expression text and relative span information for this `Placeholder`
* node.
* @param interpolationSpan The span of the whole interpolated text.
*/
_addPlaceholder(nodes, context, expression, interpolationSpan) {
const sourceSpan = getOffsetSourceSpan(interpolationSpan, expression);
const baseName = extractPlaceholderName(expression.text) || 'INTERPOLATION';
const phName = context.placeholderRegistry.getPlaceholderName(baseName, expression.text);
const text = this._interpolationConfig.start + expression.text + this._interpolationConfig.end;
context.placeholderToContent[phName] = { text, sourceSpan };
nodes.push(new i18n.Placeholder(expression.text, phName, sourceSpan));
}
}
/**
* Re-use the source-spans from `previousI18n` metadata for the `nodes`.
*
* Whitespace removal can invalidate the source-spans of interpolation nodes, so we
* reuse the source-span stored from a previous pass before the whitespace was removed.
*
* @param nodes The `Text` and `Placeholder` nodes to be processed.
* @param previousI18n Any i18n metadata for these `nodes` stored from a previous pass.
*/
function reusePreviousSourceSpans(nodes, previousI18n) {
if (previousI18n instanceof i18n.Message) {
// The `previousI18n` is an i18n `Message`, so we are processing an `Attribute` with i18n
// metadata. The `Message` should consist only of a single `Container` that contains the
// parts (`Text` and `Placeholder`) to process.
assertSingleContainerMessage(previousI18n);
previousI18n = previousI18n.nodes[0];
}
if (previousI18n instanceof i18n.Container) {
// The `previousI18n` is a `Container`, which means that this is a second i18n extraction pass
// after whitespace has been removed from the AST ndoes.
assertEquivalentNodes(previousI18n.children, nodes);
// Reuse the source-spans from the first pass.
for (let i = 0; i < nodes.length; i++) {
nodes[i].sourceSpan = previousI18n.children[i].sourceSpan;
}
}
}
/**
* Asserts that the `message` contains exactly one `Container` node.
*/
function assertSingleContainerMessage(message) {
const nodes = message.nodes;
if (nodes.length !== 1 || !(nodes[0] instanceof i18n.Container)) {
throw new Error('Unexpected previous i18n message - expected it to consist of only a single `Container` node.');
}
}
/**
* Asserts that the `previousNodes` and `node` collections have the same number of elements and
* corresponding elements have the same node type.
*/
function assertEquivalentNodes(previousNodes, nodes) {
if (previousNodes.length !== nodes.length) {
throw new Error('The number of i18n message children changed between first and second pass.');
}
if (previousNodes.some((node, i) => nodes[i].constructor !== node.constructor)) {
throw new Error('The types of the i18n message children changed between first and second pass.');
}
}
/**
* Create a new `ParseSourceSpan` from the `sourceSpan`, offset by the `start` and `end` values.
*/
function getOffsetSourceSpan(sourceSpan, { start, end }) {
return new ParseSourceSpan(sourceSpan.fullStart.moveBy(start), sourceSpan.fullStart.moveBy(end));
}
const _CUSTOM_PH_EXP = /\/\/[\s\S]*i18n[\s\S]*\([\s\S]*ph[\s\S]*=[\s\S]*("|')([\s\S]*?)\1[\s\S]*\)/g;
function extractPlaceholderName(input) {
return input.split(_CUSTOM_PH_EXP)[2];
}
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* @license\n * Copyright Google LLC 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 {Lexer as ExpressionLexer} from '../expression_parser/lexer';\nimport {InterpolationPiece, Parser as ExpressionParser} from '../expression_parser/parser';\nimport * as html from '../ml_parser/ast';\nimport {getHtmlTagDefinition} from '../ml_parser/html_tags';\nimport {InterpolationConfig} from '../ml_parser/interpolation_config';\nimport {ParseSourceSpan} from '../parse_util';\n\nimport * as i18n from './i18n_ast';\nimport {PlaceholderRegistry} from './serializers/placeholder';\n\nconst _expParser = new ExpressionParser(new ExpressionLexer());\n\nexport type VisitNodeFn = (html: html.Node, i18n: i18n.Node) => i18n.Node;\n\nexport interface I18nMessageFactory {\n  (nodes: html.Node[], meaning: string|undefined, description: string|undefined,\n   customId: string|undefined, visitNodeFn?: VisitNodeFn): i18n.Message;\n}\n\n/**\n * Returns a function converting html nodes to an i18n Message given an interpolationConfig\n */\nexport function createI18nMessageFactory(interpolationConfig: InterpolationConfig):\n    I18nMessageFactory {\n  const visitor = new _I18nVisitor(_expParser, interpolationConfig);\n  return (nodes, meaning, description, customId, visitNodeFn) =>\n             visitor.toI18nMessage(nodes, meaning, description, customId, visitNodeFn);\n}\n\ninterface I18nMessageVisitorContext {\n  isIcu: boolean;\n  icuDepth: number;\n  placeholderRegistry: PlaceholderRegistry;\n  placeholderToContent: {[phName: string]: i18n.MessagePlaceholder};\n  placeholderToMessage: {[phName: string]: i18n.Message};\n  visitNodeFn: VisitNodeFn;\n}\n\nfunction noopVisitNodeFn(_html: html.Node, i18n: i18n.Node): i18n.Node {\n  return i18n;\n}\n\nclass _I18nVisitor implements html.Visitor {\n  constructor(\n      private _expressionParser: ExpressionParser,\n      private _interpolationConfig: InterpolationConfig) {}\n\n  public toI18nMessage(\n      nodes: html.Node[], meaning = '', description = '', customId = '',\n      visitNodeFn: VisitNodeFn|undefined): i18n.Message {\n    const context: I18nMessageVisitorContext = {\n      isIcu: nodes.length == 1 && nodes[0] instanceof html.Expansion,\n      icuDepth: 0,\n      placeholderRegistry: new PlaceholderRegistry(),\n      placeholderToContent: {},\n      placeholderToMessage: {},\n      visitNodeFn: visitNodeFn || noopVisitNodeFn,\n    };\n\n    const i18nodes: i18n.Node[] = html.visitAll(this, nodes, context);\n\n    return new i18n.Message(\n        i18nodes, context.placeholderToContent, context.placeholderToMessage, meaning, description,\n        customId);\n  }\n\n  visitElement(el: html.Element, context: I18nMessageVisitorContext): i18n.Node {\n    const children = html.visitAll(this, el.children, context);\n    const attrs: {[k: string]: string} = {};\n    el.attrs.forEach(attr => {\n      // Do not visit the attributes, translatable ones are top-level ASTs\n      attrs[attr.name] = attr.value;\n    });\n\n    const isVoid: boolean = getHtmlTagDefinition(el.name).isVoid;\n    const startPhName =\n        context.placeholderRegistry.getStartTagPlaceholderName(el.name, attrs, isVoid);\n    context.placeholderToContent[startPhName] = {\n      text: el.startSourceSpan.toString(),\n      sourceSpan: el.startSourceSpan,\n    };\n\n    let closePhName = '';\n\n    if (!isVoid) {\n      closePhName = context.placeholderRegistry.getCloseTagPlaceholderName(el.name);\n      context.placeholderToContent[closePhName] = {\n        text: `</${el.name}>`,\n        sourceSpan: el.endSourceSpan ?? el.sourceSpan,\n      };\n    }\n\n    const node = new i18n.TagPlaceholder(\n        el.name, attrs, startPhName, closePhName, children, isVoid, el.sourceSpan,\n        el.startSourceSpan, el.endSourceSpan);\n    return context.visitNodeFn(el, node);\n  }\n\n  visitAttribute(attribute: html.Attribute, context: I18nMessageVisitorContext): i18n.Node {\n    const node = this._visitTextWithInterpolation(\n        attribute.value, attribute.valueSpan || attribute.sourceSpan, context, attribute.i18n);\n    return context.visitNodeFn(attribute, node);\n  }\n\n  visitText(text: html.Text, context: I18nMessageVisitorContext): i18n.Node {\n    const node = this._visitTextWithInterpolation(text.value, text.sourceSpan, context, text.i18n);\n    return context.visitNodeFn(text, node);\n  }\n\n  visitComment(comment: html.Comment, context: I18nMessageVisitorContext): i18n.Node|null {\n    return null;\n  }\n\n  visitExpansion(icu: html.Expansion, context: I18nMessageVisitorContext): i18n.Node {\n    context.icuDepth++;\n    const i18nIcuCases: {[k: string]: i18n.Node} = {};\n    const i18nIcu = new i18n.Icu(icu.switchValue, icu.type, i18nIcuCases, icu.sourceSpan);\n    icu.cases.forEach((caze): void => {\n      i18nIcuCases[caze.value] = new i18n.Container(\n          caze.expression.map((node) => node.visit(this, context)), caze.expSourceSpan);\n    });\n    context.icuDepth--;\n\n    if (context.isIcu || context.icuDepth > 0) {\n      // Returns an ICU node when:\n      // - the message (vs a part of the message) is an ICU message, or\n      // - the ICU message is nested.\n      const expPh = context.placeholderRegistry.getUniquePlaceholder(`VAR_${icu.type}`);\n      i18nIcu.expressionPlaceholder = expPh;\n      context.placeholderToContent[expPh] = {\n        text: icu.switchValue,\n        sourceSpan: icu.switchValueSourceSpan,\n      };\n      return context.visitNodeFn(icu, i18nIcu);\n    }\n\n    // Else returns a placeholder\n    // ICU placeholders should not be replaced with their original content but with the their\n    // translations.\n    // TODO(vicb): add a html.Node -> i18n.Message cache to avoid having to re-create the msg\n    const phName = context.placeholderRegistry.getPlaceholderName('ICU', icu.sourceSpan.toString());\n    context.placeholderToMessage[phName] = this.toI18nMessage([icu], '', '', '', undefined);\n    const node = new i18n.IcuPlaceholder(i18nIcu, phName, icu.sourceSpan);\n    return context.visitNodeFn(icu, node);\n  }\n\n  visitExpansionCase(_icuCase: html.ExpansionCase, _context: I18nMessageVisitorContext): i18n.Node {\n    throw new Error('Unreachable code');\n  }\n\n  /**\n   * Split the, potentially interpolated, text up into text and placeholder pieces.\n   *\n   * @param text The potentially interpolated string to be split.\n   * @param sourceSpan The span of the whole of the `text` string.\n   * @param context The current context of the visitor, used to compute and store placeholders.\n   * @param previousI18n Any i18n metadata associated with this `text` from a previous pass.\n   */\n  private _visitTextWithInterpolation(\n      text: string, sourceSpan: ParseSourceSpan, context: I18nMessageVisitorContext,\n      previousI18n: i18n.I18nMeta|undefined): i18n.Node {\n    const {strings, expressions} = this._expressionParser.splitInterpolation(\n        text, sourceSpan.start.toString(), this._interpolationConfig);\n\n    // No expressions, return a single text.\n    if (expressions.length === 0) {\n      return new i18n.Text(text, sourceSpan);\n    }\n\n    // Return a sequence of `Text` and `Placeholder` nodes grouped in a `Container`.\n    const nodes: i18n.Node[] = [];\n    for (let i = 0; i < strings.length - 1; i++) {\n      this._addText(nodes, strings[i], sourceSpan);\n      this._addPlaceholder(nodes, context, expressions[i], sourceSpan);\n    }\n    // The last index contains no expression\n    this._addText(nodes, strings[strings.length - 1], sourceSpan);\n\n    // Whitespace removal may have invalidated the interpolation source-spans.\n    reusePreviousSourceSpans(nodes, previousI18n);\n\n    return new i18n.Container(nodes, sourceSpan);\n  }\n\n  /**\n   * Create a new `Text` node from the `textPiece` and add it to the `nodes` collection.\n   *\n   * @param nodes The nodes to which the created `Text` node should be added.\n   * @param textPiece The text and relative span information for this `Text` node.\n   * @param interpolationSpan The span of the whole interpolated text.\n   */\n  private _addText(\n      nodes: i18n.Node[], textPiece: InterpolationPiece, interpolationSpan: ParseSourceSpan): void {\n    if (textPiece.text.length > 0) {\n      // No need to add empty strings\n      const stringSpan = getOffsetSourceSpan(interpolationSpan, textPiece);\n      nodes.push(new i18n.Text(textPiece.text, stringSpan));\n    }\n  }\n\n  /**\n   * Create a new `Placeholder` node from the `expression` and add it to the `nodes` collection.\n   *\n   * @param nodes The nodes to which the created `Text` node should be added.\n   * @param context The current context of the visitor, used to compute and store placeholders.\n   * @param expression The expression text and relative span information for this `Placeholder`\n   *     node.\n   * @param interpolationSpan The span of the whole interpolated text.\n   */\n  private _addPlaceholder(\n      nodes: i18n.Node[], context: I18nMessageVisitorContext, expression: InterpolationPiece,\n      interpolationSpan: ParseSourceSpan): void {\n    const sourceSpan = getOffsetSourceSpan(interpolationSpan, expression);\n    const baseName = extractPlaceholderName(expression.text) || 'INTERPOLATION';\n    const phName = context.placeholderRegistry.getPlaceholderName(baseName, expression.text);\n    const text = this._interpolationConfig.start + expression.text + this._interpolationConfig.end;\n    context.placeholderToContent[phName] = {text, sourceSpan};\n    nodes.push(new i18n.Placeholder(expression.text, phName, sourceSpan));\n  }\n}\n\n/**\n * Re-use the source-spans from `previousI18n` metadata for the `nodes`.\n *\n * Whitespace removal can invalidate the source-spans of interpolation nodes, so we\n * reuse the source-span stored from a previous pass before the whitespace was removed.\n *\n * @param nodes The `Text` and `Placeholder` nodes to be processed.\n * @param previousI18n Any i18n metadata for these `nodes` stored from a previous pass.\n */\nfunction reusePreviousSourceSpans(nodes: i18n.Node[], previousI18n: i18n.I18nMeta|undefined): void {\n  if (previousI18n instanceof i18n.Message) {\n    // The `previousI18n` is an i18n `Message`, so we are processing an `Attribute` with i18n\n    // metadata. The `Message` should consist only of a single `Container` that contains the\n    // parts (`Text` and `Placeholder`) to process.\n    assertSingleContainerMessage(previousI18n);\n    previousI18n = previousI18n.nodes[0];\n  }\n\n  if (previousI18n instanceof i18n.Container) {\n    // The `previousI18n` is a `Container`, which means that this is a second i18n extraction pass\n    // after whitespace has been removed from the AST ndoes.\n    assertEquivalentNodes(previousI18n.children, nodes);\n\n    // Reuse the source-spans from the first pass.\n    for (let i = 0; i < nodes.length; i++) {\n      nodes[i].sourceSpan = previousI18n.children[i].sourceSpan;\n    }\n  }\n}\n\n/**\n * Asserts that the `message` contains exactly one `Container` node.\n */\nfunction assertSingleContainerMessage(message: i18n.Message): void {\n  const nodes = message.nodes;\n  if (nodes.length !== 1 || !(nodes[0] instanceof i18n.Container)) {\n    throw new Error(\n        'Unexpected previous i18n message - expected it to consist of only a single `Container` node.');\n  }\n}\n\n/**\n * Asserts that the `previousNodes` and `node` collections have the same number of elements and\n * corresponding elements have the same node type.\n */\nfunction assertEquivalentNodes(previousNodes: i18n.Node[], nodes: i18n.Node[]): void {\n  if (previousNodes.length !== nodes.length) {\n    throw new Error('The number of i18n message children changed between first and second pass.');\n  }\n  if (previousNodes.some((node, i) => nodes[i].constructor !== node.constructor)) {\n    throw new Error(\n        'The types of the i18n message children changed between first and second pass.');\n  }\n}\n\n/**\n * Create a new `ParseSourceSpan` from the `sourceSpan`, offset by the `start` and `end` values.\n */\nfunction getOffsetSourceSpan(\n    sourceSpan: ParseSourceSpan, {start, end}: InterpolationPiece): ParseSourceSpan {\n  return new ParseSourceSpan(sourceSpan.fullStart.moveBy(start), sourceSpan.fullStart.moveBy(end));\n}\n\nconst _CUSTOM_PH_EXP =\n    /\\/\\/[\\s\\S]*i18n[\\s\\S]*\\([\\s\\S]*ph[\\s\\S]*=[\\s\\S]*(\"|')([\\s\\S]*?)\\1[\\s\\S]*\\)/g;\n\nfunction extractPlaceholderName(input: string): string {\n  return input.split(_CUSTOM_PH_EXP)[2];\n}\n"]}