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website/node_modules/npm/lib/install/flatten-tree.js

@@ -0,0 +1,42 @@
+'use strict'
+var validate = require('aproba')
+var moduleName = require('../utils/module-name.js')
+
+module.exports = flattenTree
+module.exports.flatName = flatName
+module.exports.flatNameFromTree = flatNameFromTree
+
+function flattenTree (tree) {
+  validate('O', arguments)
+  var seen = new Set()
+  var flat = {}
+  var todo = [[tree, '/']]
+  while (todo.length) {
+    var next = todo.shift()
+    var pkg = next[0]
+    seen.add(pkg)
+    var path = next[1]
+    flat[path] = pkg
+    if (path !== '/') path += '/'
+    for (var ii = 0; ii < pkg.children.length; ++ii) {
+      var child = pkg.children[ii]
+      if (!seen.has(child)) {
+        todo.push([child, flatName(path, child)])
+      }
+    }
+  }
+  return flat
+}
+
+function flatName (path, child) {
+  validate('SO', arguments)
+  return path + (moduleName(child) || 'TOP')
+}
+
+function flatNameFromTree (tree) {
+  validate('O', arguments)
+  if (tree.isTop) return '/'
+  var path = flatNameFromTree(tree.parent)
+  if (path !== '/') path += '/'
+  return flatName(path, tree)
+}