planning

node_modules/hast-util-is-element/convert.js

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+'use strict'
+
+module.exports = convert
+
+function convert(test) {
+  if (typeof test === 'string') {
+    return tagNameFactory(test)
+  }
+
+  if (test === null || test === undefined) {
+    return element
+  }
+
+  if (typeof test === 'object') {
+    return any(test)
+  }
+
+  if (typeof test === 'function') {
+    return callFactory(test)
+  }
+
+  throw new Error('Expected function, string, or array as test')
+}
+
+function convertAll(tests) {
+  var length = tests.length
+  var index = -1
+  var results = []
+
+  while (++index < length) {
+    results[index] = convert(tests[index])
+  }
+
+  return results
+}
+
+function any(tests) {
+  var checks = convertAll(tests)
+  var length = checks.length
+
+  return matches
+
+  function matches() {
+    var index = -1
+
+    while (++index < length) {
+      if (checks[index].apply(this, arguments)) {
+        return true
+      }
+    }
+
+    return false
+  }
+}
+
+// Utility to convert a string a tag name check.
+function tagNameFactory(test) {
+  return tagName
+
+  function tagName(node) {
+    return element(node) && node.tagName === test
+  }
+}
+
+// Utility to convert a function check.
+function callFactory(test) {
+  return call
+
+  function call(node) {
+    return element(node) && Boolean(test.apply(this, arguments))
+  }
+}
+
+// Utility to return true if this is an element.
+function element(node) {
+  return (
+    node &&
+    typeof node === 'object' &&
+    node.type === 'element' &&
+    typeof node.tagName === 'string'
+  )
+}