mirror of https://github.com/sveltejs/svelte
69 lines
1.5 KiB
69 lines
1.5 KiB
import { parse_expression_at } from '../acorn';
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import { Parser } from '../index';
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import { Identifier, Node, SimpleLiteral } from 'estree';
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import { whitespace } from '../../utils/patterns';
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const literals = new Map([['true', true], ['false', false], ['null', null]]);
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export default function read_expression(parser: Parser): Node {
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const start = parser.index;
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const name = parser.read_until(/\s*}/);
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if (name && /^[a-z]+$/.test(name)) {
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const end = start + name.length;
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if (literals.has(name)) {
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// eslint-disable-next-line @typescript-eslint/no-object-literal-type-assertion
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return {
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type: 'Literal',
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start,
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end,
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value: literals.get(name),
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raw: name,
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} as SimpleLiteral;
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}
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// eslint-disable-next-line @typescript-eslint/no-object-literal-type-assertion
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return {
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type: 'Identifier',
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start,
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end: start + name.length,
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name,
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} as Identifier;
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}
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parser.index = start;
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try {
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const node = parse_expression_at(parser.template, parser.index);
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let num_parens = 0;
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for (let i = parser.index; i < node.start; i += 1) {
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if (parser.template[i] === '(') num_parens += 1;
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}
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let index = node.end;
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while (num_parens > 0) {
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const char = parser.template[index];
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if (char === ')') {
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num_parens -= 1;
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} else if (!whitespace.test(char)) {
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parser.error({
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code: 'unexpected-token',
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message: 'Expected )'
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}, index);
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}
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index += 1;
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}
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parser.index = index;
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return node as Node;
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} catch (err) {
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parser.acorn_error(err);
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}
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}
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