planning

node_modules/unist-util-is/convert.js

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+'use strict'
+
+module.exports = convert
+
+function convert(test) {
+  if (test == null) {
+    return ok
+  }
+
+  if (typeof test === 'string') {
+    return typeFactory(test)
+  }
+
+  if (typeof test === 'object') {
+    return 'length' in test ? anyFactory(test) : allFactory(test)
+  }
+
+  if (typeof test === 'function') {
+    return test
+  }
+
+  throw new Error('Expected function, string, or object as test')
+}
+
+// Utility assert each property in `test` is represented in `node`, and each
+// values are strictly equal.
+function allFactory(test) {
+  return all
+
+  function all(node) {
+    var key
+
+    for (key in test) {
+      if (node[key] !== test[key]) return false
+    }
+
+    return true
+  }
+}
+
+function anyFactory(tests) {
+  var checks = []
+  var index = -1
+
+  while (++index < tests.length) {
+    checks[index] = convert(tests[index])
+  }
+
+  return any
+
+  function any() {
+    var index = -1
+
+    while (++index < checks.length) {
+      if (checks[index].apply(this, arguments)) {
+        return true
+      }
+    }
+
+    return false
+  }
+}
+
+// Utility to convert a string into a function which checks a given node’s type
+// for said string.
+function typeFactory(test) {
+  return type
+
+  function type(node) {
+    return Boolean(node && node.type === test)
+  }
+}
+
+// Utility to return true.
+function ok() {
+  return true
+}