planning

node_modules/unist-util-visit-parents/index.js

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+'use strict'
+
+module.exports = visitParents
+
+var convert = require('unist-util-is/convert')
+
+var CONTINUE = true
+var SKIP = 'skip'
+var EXIT = false
+
+visitParents.CONTINUE = CONTINUE
+visitParents.SKIP = SKIP
+visitParents.EXIT = EXIT
+
+function visitParents(tree, test, visitor, reverse) {
+  var is
+
+  if (typeof test === 'function' && typeof visitor !== 'function') {
+    reverse = visitor
+    visitor = test
+    test = null
+  }
+
+  is = convert(test)
+
+  one(tree, null, [])
+
+  // Visit a single node.
+  function one(node, index, parents) {
+    var result = []
+    var subresult
+
+    if (!test || is(node, index, parents[parents.length - 1] || null)) {
+      result = toResult(visitor(node, parents))
+
+      if (result[0] === EXIT) {
+        return result
+      }
+    }
+
+    if (node.children && result[0] !== SKIP) {
+      subresult = toResult(all(node.children, parents.concat(node)))
+      return subresult[0] === EXIT ? subresult : result
+    }
+
+    return result
+  }
+
+  // Visit children in `parent`.
+  function all(children, parents) {
+    var min = -1
+    var step = reverse ? -1 : 1
+    var index = (reverse ? children.length : min) + step
+    var result
+
+    while (index > min && index < children.length) {
+      result = one(children[index], index, parents)
+
+      if (result[0] === EXIT) {
+        return result
+      }
+
+      index = typeof result[1] === 'number' ? result[1] : index + step
+    }
+  }
+}
+
+function toResult(value) {
+  if (value !== null && typeof value === 'object' && 'length' in value) {
+    return value
+  }
+
+  if (typeof value === 'number') {
+    return [CONTINUE, value]
+  }
+
+  return [value]
+}