sgauthier
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31 lines
1.1 KiB
JavaScript
31 lines
1.1 KiB
JavaScript
module.exports = association
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var decode = require('parse-entities/decode-entity')
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var characterEscape = /\\([!-/:-@[-`{-~])/g
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var characterReference = /&(#(\d{1,7}|x[\da-f]{1,6})|[\da-z]{1,31});/gi
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// The `label` of an association is the string value: character escapes and
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// references work, and casing is intact.
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// The `identifier` is used to match one association to another: controversially,
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// character escapes and references don’t work in this matching: `©` does
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// not match `©`, and `\+` does not match `+`.
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// But casing is ignored (and whitespace) is trimmed and collapsed: ` A\nb`
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// matches `a b`.
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// So, we do prefer the label when figuring out how we’re going to serialize:
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// it has whitespace, casing, and we can ignore most useless character escapes
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// and all character references.
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function association(node) {
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if (node.label || !node.identifier) {
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return node.label || ''
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}
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return node.identifier
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.replace(characterEscape, '$1')
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.replace(characterReference, decodeIfPossible)
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}
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function decodeIfPossible($0, $1) {
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return decode($1) || $0
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}
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