forked from TrueCloudLab/distribution
121 lines
3.5 KiB
Go
121 lines
3.5 KiB
Go
// Copyright 2019, The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package cmp
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import "reflect"
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// valueNode represents a single node within a report, which is a
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// structured representation of the value tree, containing information
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// regarding which nodes are equal or not.
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type valueNode struct {
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parent *valueNode
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Type reflect.Type
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ValueX reflect.Value
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ValueY reflect.Value
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// NumSame is the number of leaf nodes that are equal.
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// All descendants are equal only if NumDiff is 0.
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NumSame int
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// NumDiff is the number of leaf nodes that are not equal.
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NumDiff int
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// NumIgnored is the number of leaf nodes that are ignored.
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NumIgnored int
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// NumCompared is the number of leaf nodes that were compared
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// using an Equal method or Comparer function.
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NumCompared int
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// NumTransformed is the number of non-leaf nodes that were transformed.
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NumTransformed int
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// NumChildren is the number of transitive descendants of this node.
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// This counts from zero; thus, leaf nodes have no descendants.
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NumChildren int
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// MaxDepth is the maximum depth of the tree. This counts from zero;
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// thus, leaf nodes have a depth of zero.
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MaxDepth int
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// Records is a list of struct fields, slice elements, or map entries.
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Records []reportRecord // If populated, implies Value is not populated
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// Value is the result of a transformation, pointer indirect, of
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// type assertion.
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Value *valueNode // If populated, implies Records is not populated
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// TransformerName is the name of the transformer.
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TransformerName string // If non-empty, implies Value is populated
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}
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type reportRecord struct {
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Key reflect.Value // Invalid for slice element
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Value *valueNode
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}
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func (parent *valueNode) PushStep(ps PathStep) (child *valueNode) {
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vx, vy := ps.Values()
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child = &valueNode{parent: parent, Type: ps.Type(), ValueX: vx, ValueY: vy}
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switch s := ps.(type) {
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case StructField:
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assert(parent.Value == nil)
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parent.Records = append(parent.Records, reportRecord{Key: reflect.ValueOf(s.Name()), Value: child})
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case SliceIndex:
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assert(parent.Value == nil)
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parent.Records = append(parent.Records, reportRecord{Value: child})
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case MapIndex:
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assert(parent.Value == nil)
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parent.Records = append(parent.Records, reportRecord{Key: s.Key(), Value: child})
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case Indirect:
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assert(parent.Value == nil && parent.Records == nil)
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parent.Value = child
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case TypeAssertion:
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assert(parent.Value == nil && parent.Records == nil)
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parent.Value = child
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case Transform:
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assert(parent.Value == nil && parent.Records == nil)
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parent.Value = child
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parent.TransformerName = s.Name()
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parent.NumTransformed++
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default:
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assert(parent == nil) // Must be the root step
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}
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return child
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}
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func (r *valueNode) Report(rs Result) {
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assert(r.MaxDepth == 0) // May only be called on leaf nodes
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if rs.ByIgnore() {
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r.NumIgnored++
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} else {
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if rs.Equal() {
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r.NumSame++
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} else {
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r.NumDiff++
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}
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}
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assert(r.NumSame+r.NumDiff+r.NumIgnored == 1)
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if rs.ByMethod() {
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r.NumCompared++
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}
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if rs.ByFunc() {
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r.NumCompared++
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}
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assert(r.NumCompared <= 1)
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}
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func (child *valueNode) PopStep() (parent *valueNode) {
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if child.parent == nil {
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return nil
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}
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parent = child.parent
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parent.NumSame += child.NumSame
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parent.NumDiff += child.NumDiff
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parent.NumIgnored += child.NumIgnored
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parent.NumCompared += child.NumCompared
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parent.NumTransformed += child.NumTransformed
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parent.NumChildren += child.NumChildren + 1
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if parent.MaxDepth < child.MaxDepth+1 {
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parent.MaxDepth = child.MaxDepth + 1
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}
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return parent
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}
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