| 1 | /**
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| 2 | * @typedef {import('./types.js').Rule} Rule
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| 3 | * @typedef {import('./types.js').RuleAttr} RuleAttr
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| 4 | * @typedef {import('./types.js').Node} Node
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| 5 | */
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| 6 |
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| 7 | import {zwitch} from 'zwitch'
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| 8 |
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| 9 | const handle = zwitch('operator', {
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| 10 | // @ts-expect-error: hush.
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| 11 | unknown: unknownOperator,
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| 12 | // @ts-expect-error: hush.
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| 13 | invalid: exists,
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| 14 | handlers: {
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| 15 | // @ts-expect-error: hush.
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| 16 | '=': exact,
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| 17 | // @ts-expect-error: hush.
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| 18 | '^=': begins,
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| 19 | // @ts-expect-error: hush.
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| 20 | '$=': ends,
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| 21 | // @ts-expect-error: hush.
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| 22 | '*=': containsString,
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| 23 | // @ts-expect-error: hush.
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| 24 | '~=': containsArray
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| 25 | }
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| 26 | })
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| 27 |
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| 28 | /**
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| 29 | * @param {Rule} query
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| 30 | * @param {Node} node
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| 31 | */
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| 32 | export function attribute(query, node) {
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| 33 | let index = -1
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| 34 |
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| 35 | while (++index < query.attrs.length) {
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| 36 | if (!handle(query.attrs[index], node)) return false
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| 37 | }
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| 38 |
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| 39 | return true
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| 40 | }
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| 41 |
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| 42 | /**
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| 43 | * `[attr]`
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| 44 | *
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| 45 | * @param {RuleAttr} query
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| 46 | * @param {Node} node
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| 47 | */
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| 48 | function exists(query, node) {
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| 49 | // @ts-expect-error: Looks like a record.
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| 50 | return node[query.name] !== null && node[query.name] !== undefined
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| 51 | }
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| 52 |
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| 53 | /**
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| 54 | * `[attr=value]`
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| 55 | *
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| 56 | * @param {RuleAttr} query
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| 57 | * @param {Node} node
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| 58 | */
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| 59 | function exact(query, node) {
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| 60 | // @ts-expect-error: Looks like a record.
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| 61 | return exists(query, node) && String(node[query.name]) === query.value
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| 62 | }
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| 63 |
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| 64 | /**
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| 65 | * `[attr~=value]`
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| 66 | *
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| 67 | * @param {RuleAttr} query
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| 68 | * @param {Node} node
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| 69 | */
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| 70 | function containsArray(query, node) {
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| 71 | /** @type {unknown} */
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| 72 | // @ts-expect-error: Looks like a record.
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| 73 | const value = node[query.name]
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| 74 |
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| 75 | if (value === null || value === undefined) return false
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| 76 |
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| 77 | // If this is an array, and the query is contained in it, return true.
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| 78 | // Coverage comment in place because TS turns `Array.isArray(unknown)`
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| 79 | // into `Array.<any>` instead of `Array.<unknown>`.
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| 80 | // type-coverage:ignore-next-line
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| 81 | if (Array.isArray(value) && value.includes(query.value)) {
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| 82 | return true
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| 83 | }
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| 84 |
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| 85 | // For all other values, return whether this is an exact match.
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| 86 | return String(value) === query.value
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| 87 | }
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| 88 |
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| 89 | /**
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| 90 | * `[attr^=value]`
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| 91 | *
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| 92 | * @param {RuleAttr} query
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| 93 | * @param {Node} node
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| 94 | */
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| 95 | function begins(query, node) {
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| 96 | /** @type {unknown} */
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| 97 | // @ts-expect-error: Looks like a record.
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| 98 | const value = node[query.name]
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| 99 |
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| 100 | return (
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| 101 | query.value &&
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| 102 | typeof value === 'string' &&
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| 103 | value.slice(0, query.value.length) === query.value
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| 104 | )
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| 105 | }
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| 106 |
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| 107 | /**
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| 108 | * `[attr$=value]`
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| 109 | *
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| 110 | * @param {RuleAttr} query
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| 111 | * @param {Node} node
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| 112 | */
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| 113 | function ends(query, node) {
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| 114 | /** @type {unknown} */
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| 115 | // @ts-expect-error: Looks like a record.
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| 116 | const value = node[query.name]
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| 117 |
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| 118 | return (
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| 119 | query.value &&
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| 120 | typeof value === 'string' &&
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| 121 | value.slice(-query.value.length) === query.value
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| 122 | )
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| 123 | }
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| 124 |
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| 125 | /**
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| 126 | * `[attr*=value]`
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| 127 | *
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| 128 | * @param {RuleAttr} query
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| 129 | * @param {Node} node
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| 130 | */
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| 131 | function containsString(query, node) {
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| 132 | /** @type {unknown} */
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| 133 | // @ts-expect-error: Looks like a record.
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| 134 | const value = node[query.name]
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| 135 | return query.value && typeof value === 'string' && value.includes(query.value)
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| 136 | }
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| 137 |
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| 138 | // Shouldn’t be invoked, Parser throws an error instead.
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| 139 | /* c8 ignore next 6 */
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| 140 | /**
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| 141 | * @param {{[x: string]: unknown, type: string}} query
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| 142 | */
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| 143 | function unknownOperator(query) {
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| 144 | throw new Error('Unknown operator `' + query.operator + '`')
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| 145 | }
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