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47 lines
1.3 KiB
Text
47 lines
1.3 KiB
Text
import {decodeNamedCharacterReference} from 'decode-named-character-reference'
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import {decodeNumericCharacterReference} from 'micromark-util-decode-numeric-character-reference'
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import {codes} from 'micromark-util-symbol/codes.js'
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import {constants} from 'micromark-util-symbol/constants.js'
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const characterEscapeOrReference =
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/\\([!-/:-@[-`{-~])|&(#(?:\d{1,7}|x[\da-f]{1,6})|[\da-z]{1,31});/gi
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/**
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* Utility to decode markdown strings (which occur in places such as fenced
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* code info strings, destinations, labels, and titles).
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* The “string” content type allows character escapes and -references.
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* This decodes those.
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*
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* @param {string} value
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* @returns {string}
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*/
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export function decodeString(value) {
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return value.replace(characterEscapeOrReference, decode)
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}
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/**
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* @param {string} $0
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* @param {string} $1
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* @param {string} $2
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* @returns {string}
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*/
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function decode($0, $1, $2) {
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if ($1) {
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// Escape.
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return $1
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}
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// Reference.
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const head = $2.charCodeAt(0)
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if (head === codes.numberSign) {
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const head = $2.charCodeAt(1)
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const hex = head === codes.lowercaseX || head === codes.uppercaseX
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return decodeNumericCharacterReference(
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$2.slice(hex ? 2 : 1),
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hex ? constants.numericBaseHexadecimal : constants.numericBaseDecimal
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)
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}
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return decodeNamedCharacterReference($2) || $0
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}
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