Press n or j to go to the next uncovered block, b, p or k for the previous block.
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163x 163x 163x 163x 163x 163x 163x 163x 163x 163x 163x 163x 554x | /** @import { ArrowFunctionExpression, Expression, Identifier } from 'estree' */ /** @import { AST } from '#compiler' */ /** @import { Parser } from '../index.js' */ import read_pattern from '../read/context.js'; import read_expression from '../read/expression.js'; import * as e from '../../../errors.js'; import { create_fragment } from '../utils/create.js'; import { walk } from 'zimmerframe'; import { parse_expression_at } from '../acorn.js'; import { create_expression_metadata } from '../../nodes.js'; const regex_whitespace_with_closing_curly_brace = /^\s*}/; /** @param {Parser} parser */ export default function tag(parser) { const start = parser.index; parser.index += 1; parser.allow_whitespace(); if (parser.eat('#')) return open(parser); if (parser.eat(':')) return next(parser); if (parser.eat('@')) return special(parser); if (parser.match('/')) { if (!parser.match('/*') && !parser.match('//')) { parser.eat('/'); return close(parser); } } const expression = read_expression(parser); parser.allow_whitespace(); parser.eat('}', true); /** @type {ReturnType<typeof parser.append<AST.ExpressionTag>>} */ parser.append({ type: 'ExpressionTag', start, end: parser.index, expression, metadata: { expression: create_expression_metadata() } }); } /** @param {Parser} parser */ function open(parser) { let start = parser.index - 2; while (parser.template[start] !== '{') start -= 1; if (parser.eat('if')) { parser.require_whitespace(); /** @type {ReturnType<typeof parser.append<AST.IfBlock>>} */ const block = parser.append({ type: 'IfBlock', elseif: false, start, end: -1, test: read_expression(parser), consequent: create_fragment(), alternate: null }); parser.allow_whitespace(); parser.eat('}', true); parser.stack.push(block); parser.fragments.push(block.consequent); return; } if (parser.eat('each')) { parser.require_whitespace(); const template = parser.template; let end = parser.template.length; /** @type {Expression | undefined} */ let expression; // we have to do this loop because `{#each x as { y = z }}` fails to parse — // the `as { y = z }` is treated as an Expression but it's actually a Pattern. // the 'fix' is to backtrack and hide everything from the `as` onwards, until // we get a valid expression while (!expression) { try { expression = read_expression(parser); } catch (err) { end = /** @type {any} */ (err).position[0] - 2; while (end > start && parser.template.slice(end, end + 2) !== 'as') { end -= 1; } if (end <= start) throw err; // @ts-expect-error parser.template is meant to be readonly, this is a special case parser.template = template.slice(0, end); } } // @ts-expect-error parser.template = template; parser.allow_whitespace(); // {#each} blocks must declare a context – {#each list as item} if (!parser.match('as')) { // this could be a TypeScript assertion that was erroneously eaten. if (expression.type === 'SequenceExpression') { expression = expression.expressions[0]; } let assertion = null; let end = expression.end; expression = walk(expression, null, { // @ts-expect-error TSAsExpression(node, context) { if (node.end === /** @type {Expression} */ (expression).end) { assertion = node; end = node.expression.end; return node.expression; } context.next(); } }); expression.end = end; if (assertion) { // we can't reset `parser.index` to `expression.expression.end` because // it will ignore any parentheses — we need to jump through this hoop let end = /** @type {any} */ (/** @type {any} */ (assertion).typeAnnotation).start - 2; while (parser.template.slice(end, end + 2) !== 'as') end -= 1; parser.index = end; } } parser.eat('as', true); parser.require_whitespace(); const context = read_pattern(parser); parser.allow_whitespace(); let index; let key; if (parser.eat(',')) { parser.allow_whitespace(); index = parser.read_identifier(); if (!index) { e.expected_identifier(parser.index); } parser.allow_whitespace(); } if (parser.eat('(')) { parser.allow_whitespace(); key = read_expression(parser); parser.allow_whitespace(); parser.eat(')', true); parser.allow_whitespace(); } parser.eat('}', true); /** @type {ReturnType<typeof parser.append<AST.EachBlock>>} */ const block = parser.append({ type: 'EachBlock', start, end: -1, expression, body: create_fragment(), context, index, key, metadata: /** @type {any} */ (null) // filled in later }); parser.stack.push(block); parser.fragments.push(block.body); return; } if (parser.eat('await')) { parser.require_whitespace(); const expression = read_expression(parser); parser.allow_whitespace(); /** @type {ReturnType<typeof parser.append<AST.AwaitBlock>>} */ const block = parser.append({ type: 'AwaitBlock', start, end: -1, expression, value: null, error: null, pending: null, then: null, catch: null }); if (parser.eat('then')) { if (parser.match_regex(regex_whitespace_with_closing_curly_brace)) { parser.allow_whitespace(); } else { parser.require_whitespace(); block.value = read_pattern(parser); parser.allow_whitespace(); } block.then = create_fragment(); parser.fragments.push(block.then); } else if (parser.eat('catch')) { if (parser.match_regex(regex_whitespace_with_closing_curly_brace)) { parser.allow_whitespace(); } else { parser.require_whitespace(); block.error = read_pattern(parser); parser.allow_whitespace(); } block.catch = create_fragment(); parser.fragments.push(block.catch); } else { block.pending = create_fragment(); parser.fragments.push(block.pending); } parser.eat('}', true); parser.stack.push(block); return; } if (parser.eat('key')) { parser.require_whitespace(); const expression = read_expression(parser); parser.allow_whitespace(); parser.eat('}', true); /** @type {ReturnType<typeof parser.append<AST.KeyBlock>>} */ const block = parser.append({ type: 'KeyBlock', start, end: -1, expression, fragment: create_fragment() }); parser.stack.push(block); parser.fragments.push(block.fragment); return; } if (parser.eat('snippet')) { parser.require_whitespace(); const name_start = parser.index; const name = parser.read_identifier(); const name_end = parser.index; if (name === null) { e.expected_identifier(parser.index); } parser.allow_whitespace(); const params_start = parser.index; parser.eat('(', true); let parentheses = 1; while (parser.index < parser.template.length && (!parser.match(')') || parentheses !== 1)) { if (parser.match('(')) parentheses++; if (parser.match(')')) parentheses--; parser.index += 1; } parser.eat(')', true); const prelude = parser.template.slice(0, params_start).replace(/\S/g, ' '); const params = parser.template.slice(params_start, parser.index); let function_expression = /** @type {ArrowFunctionExpression} */ ( parse_expression_at(prelude + `${params} => {}`, parser.ts, params_start) ); parser.allow_whitespace(); parser.eat('}', true); /** @type {ReturnType<typeof parser.append<AST.SnippetBlock>>} */ const block = parser.append({ type: 'SnippetBlock', start, end: -1, expression: { type: 'Identifier', start: name_start, end: name_end, name }, parameters: function_expression.params, body: create_fragment() }); parser.stack.push(block); parser.fragments.push(block.body); return; } e.expected_block_type(parser.index); } /** @param {Parser} parser */ function next(parser) { const start = parser.index - 1; const block = parser.current(); // TODO type should not be TemplateNode, that's much too broad if (block.type === 'IfBlock') { if (!parser.eat('else')) e.expected_token(start, '{:else} or {:else if}'); if (parser.eat('if')) e.block_invalid_elseif(start); parser.allow_whitespace(); parser.fragments.pop(); block.alternate = create_fragment(); parser.fragments.push(block.alternate); // :else if if (parser.eat('if')) { parser.require_whitespace(); const expression = read_expression(parser); parser.allow_whitespace(); parser.eat('}', true); let elseif_start = start - 1; while (parser.template[elseif_start] !== '{') elseif_start -= 1; /** @type {ReturnType<typeof parser.append<AST.IfBlock>>} */ const child = parser.append({ start: elseif_start, end: -1, type: 'IfBlock', elseif: true, test: expression, consequent: create_fragment(), alternate: null }); parser.stack.push(child); parser.fragments.pop(); parser.fragments.push(child.consequent); } else { // :else parser.allow_whitespace(); parser.eat('}', true); } return; } if (block.type === 'EachBlock') { if (!parser.eat('else')) e.expected_token(start, '{:else}'); parser.allow_whitespace(); parser.eat('}', true); block.fallback = create_fragment(); parser.fragments.pop(); parser.fragments.push(block.fallback); return; } if (block.type === 'AwaitBlock') { if (parser.eat('then')) { if (block.then) { e.block_duplicate_clause(start, '{:then}'); } if (!parser.eat('}')) { parser.require_whitespace(); block.value = read_pattern(parser); parser.allow_whitespace(); parser.eat('}', true); } block.then = create_fragment(); parser.fragments.pop(); parser.fragments.push(block.then); return; } if (parser.eat('catch')) { if (block.catch) { e.block_duplicate_clause(start, '{:catch}'); } if (!parser.eat('}')) { parser.require_whitespace(); block.error = read_pattern(parser); parser.allow_whitespace(); parser.eat('}', true); } block.catch = create_fragment(); parser.fragments.pop(); parser.fragments.push(block.catch); return; } e.expected_token(start, '{:then ...} or {:catch ...}'); } e.block_invalid_continuation_placement(start); } /** @param {Parser} parser */ function close(parser) { const start = parser.index - 1; let block = parser.current(); switch (block.type) { case 'IfBlock': parser.eat('if', true); parser.allow_whitespace(); parser.eat('}', true); while (block.elseif) { block.end = parser.index; parser.stack.pop(); block = /** @type {AST.IfBlock} */ (parser.current()); } block.end = parser.index; parser.pop(); return; case 'EachBlock': parser.eat('each', true); break; case 'KeyBlock': parser.eat('key', true); break; case 'AwaitBlock': parser.eat('await', true); break; case 'SnippetBlock': parser.eat('snippet', true); break; case 'RegularElement': // TODO handle implicitly closed elements e.block_unexpected_close(start); break; default: e.block_unexpected_close(start); } parser.allow_whitespace(); parser.eat('}', true); block.end = parser.index; parser.pop(); } /** @param {Parser} parser */ function special(parser) { let start = parser.index; while (parser.template[start] !== '{') start -= 1; if (parser.eat('html')) { // {@html content} tag parser.require_whitespace(); const expression = read_expression(parser); parser.allow_whitespace(); parser.eat('}', true); /** @type {ReturnType<typeof parser.append<AST.HtmlTag>>} */ parser.append({ type: 'HtmlTag', start, end: parser.index, expression }); return; } if (parser.eat('debug')) { /** @type {Identifier[]} */ let identifiers; // Implies {@debug} which indicates "debug all" if (parser.read(regex_whitespace_with_closing_curly_brace)) { identifiers = []; } else { const expression = read_expression(parser); identifiers = expression.type === 'SequenceExpression' ? /** @type {Identifier[]} */ (expression.expressions) : [/** @type {Identifier} */ (expression)]; identifiers.forEach( /** @param {any} node */ (node) => { if (node.type !== 'Identifier') { e.debug_tag_invalid_arguments(/** @type {number} */ (node.start)); } } ); parser.allow_whitespace(); parser.eat('}', true); } /** @type {ReturnType<typeof parser.append<AST.DebugTag>>} */ parser.append({ type: 'DebugTag', start, end: parser.index, identifiers }); return; } if (parser.eat('const')) { parser.require_whitespace(); const id = read_pattern(parser); parser.allow_whitespace(); parser.eat('=', true); parser.allow_whitespace(); const expression_start = parser.index; const init = read_expression(parser); if ( init.type === 'SequenceExpression' && !parser.template.substring(expression_start, init.start).includes('(') ) { // const a = (b, c) is allowed but a = b, c = d is not; e.const_tag_invalid_expression(init); } parser.allow_whitespace(); parser.eat('}', true); /** @type {ReturnType<typeof parser.append<AST.ConstTag>>} */ parser.append({ type: 'ConstTag', start, end: parser.index, declaration: { type: 'VariableDeclaration', kind: 'const', declarations: [{ type: 'VariableDeclarator', id, init, start: id.start, end: init.end }], start: start + 2, // start at const, not at @const end: parser.index - 1 } }); } if (parser.eat('render')) { // {@render foo(...)} parser.require_whitespace(); const expression = read_expression(parser); if ( expression.type !== 'CallExpression' && (expression.type !== 'ChainExpression' || expression.expression.type !== 'CallExpression') ) { e.render_tag_invalid_expression(expression); } parser.allow_whitespace(); parser.eat('}', true); /** @type {ReturnType<typeof parser.append<AST.RenderTag>>} */ parser.append({ type: 'RenderTag', start, end: parser.index, expression: expression, metadata: { dynamic: false, args_with_call_expression: new Set() } }); } } |