planning

node_modules/mdast-util-definitions/index.js

@@ -0,0 +1,51 @@
+'use strict'
+
+var visit = require('unist-util-visit')
+
+module.exports = getDefinitionFactory
+
+var own = {}.hasOwnProperty
+
+// Get a definition in `node` by `identifier`.
+function getDefinitionFactory(node, options) {
+  return getterFactory(gather(node, options))
+}
+
+// Gather all definitions in `node`
+function gather(node, options) {
+  var cache = {}
+
+  if (!node || !node.type) {
+    throw new Error('mdast-util-definitions expected node')
+  }
+
+  visit(node, 'definition', options && options.commonmark ? commonmark : normal)
+
+  return cache
+
+  function commonmark(definition) {
+    var id = normalise(definition.identifier)
+    if (!own.call(cache, id)) {
+      cache[id] = definition
+    }
+  }
+
+  function normal(definition) {
+    cache[normalise(definition.identifier)] = definition
+  }
+}
+
+// Factory to get a node from the given definition-cache.
+function getterFactory(cache) {
+  return getter
+
+  // Get a node from the bound definition-cache.
+  function getter(identifier) {
+    var id = identifier && normalise(identifier)
+    return id && own.call(cache, id) ? cache[id] : null
+  }
+}
+
+function normalise(identifier) {
+  return identifier.toUpperCase()
+}