Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 1520x 1520x 1520x 1520x 1520x 1233x 1233x 1233x 1233x 1233x 1233x 1233x 1233x 1233x 1233x 1233x 1233x 1233x 1233x 1233x 287x 1326x 287x 287x 1520x 1520x 1520x 7951x 7951x 251x 7951x 538x 538x 538x 287x 287x 287x 538x 7951x 7951x 287x 287x 287x 287x 287x 287x 287x 287x 287x 287x 287x 287x 287x 287x 287x 287x 287x 287x 287x 287x 287x 287x 287x 1326x 284x 284x 1326x 3x 3x 1520x 2x 2x 2x 2x 2x 1516x 1516x 1516x 1516x 1516x 1510x 1510x 1510x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 154x 4x 4x 4x 4x 6x 6x 154x 2x 2x 6x 6x 6x 6x 6x 6x 6x 6x 6x | /** @import { Location } from 'locate-character' */
/** @import { Pattern } from 'estree' */
/** @import { Parser } from '../index.js' */
// @ts-expect-error acorn type definitions are borked in the release we use
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 * as e from '../../../errors.js';
import { locator } from '../../../state.js';
/**
* @param {Parser} parser
* @returns {Pattern}
*/
export default function read_pattern(parser) {
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);
return {
type: 'Identifier',
name,
start,
loc: {
start: /** @type {Location} */ (locator(start)),
end: /** @type {Location} */ (locator(parser.index))
},
end: parser.index,
typeAnnotation: annotation
};
}
if (!is_bracket_open(code)) {
e.expected_pattern(i);
}
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)) {
e.expected_token(i, 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);
if (expression.typeAnnotation) {
expression.end = expression.typeAnnotation.end;
}
return expression;
} catch (error) {
parser.acorn_error(error);
}
}
/**
* @param {Parser} parser
* @returns {any}
*/
function read_type_annotation(parser) {
const start = parser.index;
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
};
}
|