Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import fragment from './state/fragment.js'; import { regex_whitespace } from '../patterns.js'; import full_char_code_at from './utils/full_char_code_at.js'; import * as e from '../../errors.js'; import { create_fragment } from './utils/create.js'; import read_options from './read/options.js'; import { is_reserved } from '../../../utils.js'; import { disallow_children } from '../2-analyze/visitors/shared/special-element.js'; const regex_position_indicator = / \(\d+:\d+\)$/; const regex_lang_attribute = /<!--[^]*?-->|<script\s+(?:[^>]*|(?:[^=>'"/]+=(?:"[^"]*"|'[^']*'|[^>\s]+)\s+)*)lang=(["'])?([^"' >]+)\1[^>]*>/g; export class Parser { /** * @readonly * @type {string} */ template; /** */ index = 0; /** Whether we're parsing in TypeScript mode */ ts = false; /** @type {TemplateNode[]} */ stack = []; /** @type {AST.Fragment[]} */ fragments = []; /** @type {AST.Root} */ root; /** @type {Record<string, boolean>} */ meta_tags = {}; /** @type {LastAutoClosedTag | undefined} */ last_auto_closed_tag; /** @param {string} template */ constructor(template) { if (typeof template !== 'string') { throw new TypeError('Template must be a string'); } this.template = template.trimEnd(); let match_lang; do match_lang = regex_lang_attribute.exec(template); while (match_lang && match_lang[0][1] !== 's'); // ensure it starts with '<s' to match script tags regex_lang_attribute.lastIndex = 0; // reset matched index to pass tests - otherwise declare the regex inside the constructor this.ts = match_lang?.[2] === 'ts'; this.root = { css: null, js: [], // @ts-ignore start: null, // @ts-ignore end: null, type: 'Root', fragment: create_fragment(), options: null, metadata: { ts: this.ts } }; this.stack.push(this.root); this.fragments.push(this.root.fragment); /** @type {ParserState} */ let state = fragment; while (this.index < this.template.length) { state = state(this) || fragment; } if (this.stack.length > 1) { const current = this.current(); if (current.type === 'RegularElement') { current.end = current.start + 1; e.element_unclosed(current, current.name); } else { current.end = current.start + 1; e.block_unclosed(current); } } if (state !== fragment) { e.unexpected_eof(this.index); } if (this.root.fragment.nodes.length) { let start = /** @type {number} */ (this.root.fragment.nodes[0].start); while (regex_whitespace.test(template[start])) start += 1; let end = /** @type {number} */ ( this.root.fragment.nodes[this.root.fragment.nodes.length - 1].end ); while (regex_whitespace.test(template[end - 1])) end -= 1; this.root.start = start; this.root.end = end; } else { // @ts-ignore this.root.start = this.root.end = null; } const options_index = this.root.fragment.nodes.findIndex( /** @param {any} thing */ (thing) => thing.type === 'SvelteOptions' ); if (options_index !== -1) { const options = /** @type {AST.SvelteOptionsRaw} */ (this.root.fragment.nodes[options_index]); this.root.fragment.nodes.splice(options_index, 1); this.root.options = read_options(options); disallow_children(options); // We need this for the old AST format Object.defineProperty(this.root.options, '__raw__', { value: options, enumerable: false }); } } current() { return this.stack[this.stack.length - 1]; } /** * @param {any} err * @returns {never} */ acorn_error(err) { e.js_parse_error(err.pos, err.message.replace(regex_position_indicator, '')); } /** * @param {string} str * @param {boolean} required */ eat(str, required = false) { if (this.match(str)) { this.index += str.length; return true; } if (required) { e.expected_token(this.index, str); } return false; } /** @param {string} str */ match(str) { const length = str.length; if (length === 1) { // more performant than slicing return this.template[this.index] === str; } return this.template.slice(this.index, this.index + length) === str; } /** * Match a regex at the current index * @param {RegExp} pattern Should have a ^ anchor at the start so the regex doesn't search past the beginning, resulting in worse performance */ match_regex(pattern) { const match = pattern.exec(this.template.slice(this.index)); if (!match || match.index !== 0) return null; return match[0]; } allow_whitespace() { while (this.index < this.template.length && regex_whitespace.test(this.template[this.index])) { this.index++; } } /** * Search for a regex starting at the current index and return the result if it matches * @param {RegExp} pattern Should have a ^ anchor at the start so the regex doesn't search past the beginning, resulting in worse performance */ read(pattern) { const result = this.match_regex(pattern); if (result) this.index += result.length; return result; } /** @param {any} allow_reserved */ read_identifier(allow_reserved = false) { const start = this.index; let i = this.index; const code = full_char_code_at(this.template, i); if (!isIdentifierStart(code, true)) return null; i += code <= 0xffff ? 1 : 2; while (i < this.template.length) { const code = full_char_code_at(this.template, i); if (!isIdentifierChar(code, true)) break; i += code <= 0xffff ? 1 : 2; } const identifier = this.template.slice(this.index, (this.index = i)); if (!allow_reserved && is_reserved(identifier)) { e.unexpected_reserved_word(start, identifier); } return identifier; } /** @param {RegExp} pattern */ read_until(pattern) { if (this.index >= this.template.length) { e.unexpected_eof(this.template.length); } const start = this.index; const match = pattern.exec(this.template.slice(start)); if (match) { this.index = start + match.index; return this.template.slice(start, this.index); } this.index = this.template.length; return this.template.slice(start); } require_whitespace() { if (!regex_whitespace.test(this.template[this.index])) { e.expected_whitespace(this.index); } this.allow_whitespace(); } pop() { this.fragments.pop(); return this.stack.pop(); } /** * @template T * @param {Omit<T, 'prev' | 'parent'>} node * @returns {T} */ append(node) { const current = this.current(); const fragment = this.fragments.at(-1); Object.defineProperties(node, { prev: { enumerable: false, value: fragment?.nodes.at(-1) ?? null }, parent: { enumerable: false, configurable: true, value: current } }); // @ts-expect-error fragment.nodes.push(node); // @ts-expect-error return node; } } /** * @param {string} template * @returns {AST.Root} */ export function parse(template) { const parser = new Parser(template); return parser.root; } /** @typedef {(parser: Parser) => ParserState | void} ParserState */ /** @typedef {Object} LastAutoClosedTag * @property {string} tag * @property {string} reason * @property {number} depth */ |