129 lines
4.5 KiB
TypeScript
129 lines
4.5 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import * as e from '../../../src/expression_parser/ast';
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import {Lexer} from '../../../src/expression_parser/lexer';
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import {Parser} from '../../../src/expression_parser/parser';
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import * as html from '../../../src/ml_parser/ast';
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import {HtmlParser, ParseTreeResult} from '../../../src/ml_parser/html_parser';
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import {WhitespaceVisitor} from '../../../src/ml_parser/html_whitespaces';
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import {DEFAULT_INTERPOLATION_CONFIG, InterpolationConfig} from '../../../src/ml_parser/interpolation_config';
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import * as a from '../../../src/render3/r3_ast';
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import {htmlAstToRender3Ast, Render3ParseResult} from '../../../src/render3/r3_template_transform';
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import {I18nMetaVisitor} from '../../../src/render3/view/i18n/meta';
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import {LEADING_TRIVIA_CHARS} from '../../../src/render3/view/template';
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import {BindingParser} from '../../../src/template_parser/binding_parser';
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import {MockSchemaRegistry} from '../../../testing';
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export function findExpression(tmpl: a.Node[], expr: string): e.AST|null {
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const res = tmpl.reduce((found, node) => {
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if (found !== null) {
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return found;
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} else {
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return findExpressionInNode(node, expr);
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}
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}, null as e.AST | null);
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if (res instanceof e.ASTWithSource) {
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return res.ast;
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}
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return res;
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}
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function findExpressionInNode(node: a.Node, expr: string): e.AST|null {
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if (node instanceof a.Element || node instanceof a.Template) {
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return findExpression(
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[
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...node.inputs,
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...node.outputs,
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...node.children,
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],
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expr);
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} else if (node instanceof a.BoundAttribute || node instanceof a.BoundText) {
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const ts = toStringExpression(node.value);
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return toStringExpression(node.value) === expr ? node.value : null;
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} else if (node instanceof a.BoundEvent) {
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return toStringExpression(node.handler) === expr ? node.handler : null;
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} else {
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return null;
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}
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}
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export function toStringExpression(expr: e.AST): string {
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while (expr instanceof e.ASTWithSource) {
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expr = expr.ast;
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}
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if (expr instanceof e.PropertyRead) {
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if (expr.receiver instanceof e.ImplicitReceiver) {
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return expr.name;
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} else {
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return `${toStringExpression(expr.receiver)}.${expr.name}`;
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}
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} else if (expr instanceof e.ImplicitReceiver) {
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return '';
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} else if (expr instanceof e.Interpolation) {
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let str = '{{';
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for (let i = 0; i < expr.expressions.length; i++) {
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str += expr.strings[i] + toStringExpression(expr.expressions[i]);
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}
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str += expr.strings[expr.strings.length - 1] + '}}';
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return str;
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} else {
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throw new Error(`Unsupported type: ${(expr as any).constructor.name}`);
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}
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}
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// Parse an html string to IVY specific info
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export function parseR3(
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input: string,
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options: {preserveWhitespaces?: boolean,
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leadingTriviaChars?: string[],
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ignoreError?: boolean} = {}): Render3ParseResult {
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const htmlParser = new HtmlParser();
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const parseResult = htmlParser.parse(input, 'path:://to/template', {
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tokenizeExpansionForms: true,
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leadingTriviaChars: options.leadingTriviaChars ?? LEADING_TRIVIA_CHARS,
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});
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if (parseResult.errors.length > 0 && !options.ignoreError) {
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const msg = parseResult.errors.map(e => e.toString()).join('\n');
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throw new Error(msg);
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}
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let htmlNodes = processI18nMeta(parseResult).rootNodes;
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if (!options.preserveWhitespaces) {
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htmlNodes = html.visitAll(new WhitespaceVisitor(), htmlNodes);
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}
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const expressionParser = new Parser(new Lexer());
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const schemaRegistry = new MockSchemaRegistry(
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{'invalidProp': false}, {'mappedAttr': 'mappedProp'}, {'unknown': false, 'un-known': false},
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['onEvent'], ['onEvent']);
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const bindingParser =
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new BindingParser(expressionParser, DEFAULT_INTERPOLATION_CONFIG, schemaRegistry, null, []);
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const r3Result = htmlAstToRender3Ast(htmlNodes, bindingParser);
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if (r3Result.errors.length > 0 && !options.ignoreError) {
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const msg = r3Result.errors.map(e => e.toString()).join('\n');
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throw new Error(msg);
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}
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return r3Result;
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}
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export function processI18nMeta(
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htmlAstWithErrors: ParseTreeResult,
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interpolationConfig: InterpolationConfig = DEFAULT_INTERPOLATION_CONFIG): ParseTreeResult {
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return new ParseTreeResult(
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html.visitAll(
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new I18nMetaVisitor(interpolationConfig, /* keepI18nAttrs */ false),
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htmlAstWithErrors.rootNodes),
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htmlAstWithErrors.errors);
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}
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