Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { isIdentifierStart } from 'acorn';
import full_char_code_at from '../utils/full_char_code_at.js';
import {
is_bracket_open,
is_bracket_close,
is_bracket_pair,
get_bracket_close
} from '../utils/bracket.js';
import { parse_expression_at } from '../acorn.js';
import { regex_not_newline_characters } from '../../patterns.js';
import { error } from '../../../errors.js';
/**
* @param {import('../index.js').Parser} parser
* @param {boolean} [optional_allowed]
* @returns {import('estree').Pattern}
*/
export default function read_pattern(parser, optional_allowed = false) {
const start = parser.index;
let i = parser.index;
const code = full_char_code_at(parser.template, i);
if (isIdentifierStart(code, true)) {
const name = /** @type {string} */ (parser.read_identifier());
const annotation = read_type_annotation(parser, optional_allowed);
return {
type: 'Identifier',
name,
start,
loc: parser.get_location(start, parser.index),
end: parser.index,
typeAnnotation: annotation
};
}
if (!is_bracket_open(code)) {
error(i, 'expected-pattern');
}
const bracket_stack = [code];
i += code <= 0xffff ? 1 : 2;
while (i < parser.template.length) {
const code = full_char_code_at(parser.template, i);
if (is_bracket_open(code)) {
bracket_stack.push(code);
} else if (is_bracket_close(code)) {
const popped = /** @type {number} */ (bracket_stack.pop());
if (!is_bracket_pair(popped, code)) {
error(
i,
'expected-token',
String.fromCharCode(/** @type {number} */ (get_bracket_close(popped)))
);
}
if (bracket_stack.length === 0) {
i += code <= 0xffff ? 1 : 2;
break;
}
}
i += code <= 0xffff ? 1 : 2;
}
parser.index = i;
const pattern_string = parser.template.slice(start, i);
try {
// the length of the `space_with_newline` has to be start - 1
// because we added a `(` in front of the pattern_string,
// which shifted the entire string to right by 1
// so we offset it by removing 1 character in the `space_with_newline`
// to achieve that, we remove the 1st space encountered,
// so it will not affect the `column` of the node
let space_with_newline = parser.template
.slice(0, start)
.replace(regex_not_newline_characters, ' ');
const first_space = space_with_newline.indexOf(' ');
space_with_newline =
space_with_newline.slice(0, first_space) + space_with_newline.slice(first_space + 1);
const expression = /** @type {any} */ (
parse_expression_at(`${space_with_newline}(${pattern_string} = 1)`, parser.ts, start - 1)
).left;
expression.typeAnnotation = read_type_annotation(parser, optional_allowed);
if (expression.typeAnnotation) {
expression.end = expression.typeAnnotation.end;
}
return expression;
} catch (error) {
parser.acorn_error(error);
}
}
/**
* @param {import('../index.js').Parser} parser
* @param {boolean} [optional_allowed]
* @returns {any}
*/
function read_type_annotation(parser, optional_allowed = false) {
const start = parser.index;
parser.allow_whitespace();
if (optional_allowed && parser.eat('?')) {
// Acorn-TS puts the optional info as a property on the surrounding node.
// We spare the work here because it doesn't matter for us anywhere else.
parser.allow_whitespace();
}
if (!parser.eat(':')) {
parser.index = start;
return undefined;
}
// we need to trick Acorn into parsing the type annotation
const insert = '_ as ';
let a = parser.index - insert.length;
const template =
parser.template.slice(0, a).replace(/[^\n]/g, ' ') +
insert +
// If this is a type annotation for a function parameter, Acorn-TS will treat subsequent
// parameters as part of a sequence expression instead, and will then error on optional
// parameters (`?:`). Therefore replace that sequence with something that will not error.
parser.template.slice(parser.index).replace(/\?\s*:/g, ':');
let expression = parse_expression_at(template, parser.ts, a);
// `foo: bar = baz` gets mangled — fix it
if (expression.type === 'AssignmentExpression') {
let b = expression.right.start;
while (template[b] !== '=') b -= 1;
expression = parse_expression_at(template.slice(0, b), parser.ts, a);
}
// `array as item: string, index` becomes `string, index`, which is mistaken as a sequence expression - fix that
if (expression.type === 'SequenceExpression') {
expression = expression.expressions[0];
}
parser.index = /** @type {number} */ (expression.end);
return {
type: 'TSTypeAnnotation',
start,
end: parser.index,
typeAnnotation: /** @type {any} */ (expression).typeAnnotation
};
}
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