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'use strict'
var createNode = require('./node.js').create
module.exports = function (tree, filter) {
return copyTree(tree, {}, filter)
}
function copyTree (tree, cache, filter) {
if (filter && !filter(tree)) { return null }
if (cache[tree.path]) { return cache[tree.path] }
var newTree = cache[tree.path] = createNode(Object.assign({}, tree))
copyModuleList(newTree, 'children', cache, filter)
newTree.children.forEach(function (child) {
child.parent = newTree
})
copyModuleList(newTree, 'requires', cache, filter)
copyModuleList(newTree, 'requiredBy', cache, filter)
return newTree
}
function copyModuleList (tree, key, cache, filter) {
var newList = []
if (tree[key]) {
tree[key].forEach(function (child) {
const copy = copyTree(child, cache, filter)
if (copy) {
newList.push(copy)
}
})
}
tree[key] = newList
}
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