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34 lines
1.1 KiB
JavaScript
34 lines
1.1 KiB
JavaScript
/**
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* @import {AssociationId} from '../types.js'
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*/
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import {decodeString} from 'micromark-util-decode-string'
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/**
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* Get an identifier from an association to match it to others.
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*
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* Associations are nodes that match to something else through an ID:
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* <https://github.com/syntax-tree/mdast#association>.
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*
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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:
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* controversially, character escapes and references don’t work in this
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* matching: `©` does not match `©`, and `\+` does not match `+`.
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*
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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
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* escapes and all character references.
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*
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* @type {AssociationId}
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*/
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export 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 decodeString(node.identifier)
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}
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