52 lines
1.1 KiB
JavaScript
52 lines
1.1 KiB
JavaScript
'use strict'
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var visit = require('unist-util-visit')
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module.exports = getDefinitionFactory
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var own = {}.hasOwnProperty
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// Get a definition in `node` by `identifier`.
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function getDefinitionFactory(node, options) {
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return getterFactory(gather(node, options))
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}
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// Gather all definitions in `node`
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function gather(node, options) {
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var cache = {}
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if (!node || !node.type) {
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throw new Error('mdast-util-definitions expected node')
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}
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visit(node, 'definition', options && options.commonmark ? commonmark : normal)
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return cache
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function commonmark(definition) {
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var id = normalise(definition.identifier)
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if (!own.call(cache, id)) {
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cache[id] = definition
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}
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}
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function normal(definition) {
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cache[normalise(definition.identifier)] = definition
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}
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}
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// Factory to get a node from the given definition-cache.
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function getterFactory(cache) {
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return getter
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// Get a node from the bound definition-cache.
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function getter(identifier) {
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var id = identifier && normalise(identifier)
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return id && own.call(cache, id) ? cache[id] : null
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}
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}
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function normalise(identifier) {
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return identifier.toUpperCase()
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}
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