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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package html
import (
"fmt"
)
// checkTreeConsistency checks that a node and its descendants are all
// consistent in their parent/child/sibling relationships.
func checkTreeConsistency(n *Node) error {
return checkTreeConsistency1(n, 0)
}
func checkTreeConsistency1(n *Node, depth int) error {
if depth == 1e4 {
return fmt.Errorf("html: tree looks like it contains a cycle")
}
if err := checkNodeConsistency(n); err != nil {
return err
}
for c := n.FirstChild; c != nil; c = c.NextSibling {
if err := checkTreeConsistency1(c, depth+1); err != nil {
return err
}
}
return nil
}
// checkNodeConsistency checks that a node's parent/child/sibling relationships
// are consistent.
func checkNodeConsistency(n *Node) error {
if n == nil {
return nil
}
nParent := 0
for p := n.Parent; p != nil; p = p.Parent {
nParent++
if nParent == 1e4 {
return fmt.Errorf("html: parent list looks like an infinite loop")
}
}
nForward := 0
for c := n.FirstChild; c != nil; c = c.NextSibling {
nForward++
if nForward == 1e6 {
return fmt.Errorf("html: forward list of children looks like an infinite loop")
}
if c.Parent != n {
return fmt.Errorf("html: inconsistent child/parent relationship")
}
}
nBackward := 0
for c := n.LastChild; c != nil; c = c.PrevSibling {
nBackward++
if nBackward == 1e6 {
return fmt.Errorf("html: backward list of children looks like an infinite loop")
}
if c.Parent != n {
return fmt.Errorf("html: inconsistent child/parent relationship")
}
}
if n.Parent != nil {
if n.Parent == n {
return fmt.Errorf("html: inconsistent parent relationship")
}
if n.Parent == n.FirstChild {
return fmt.Errorf("html: inconsistent parent/first relationship")
}
if n.Parent == n.LastChild {
return fmt.Errorf("html: inconsistent parent/last relationship")
}
if n.Parent == n.PrevSibling {
return fmt.Errorf("html: inconsistent parent/prev relationship")
}
if n.Parent == n.NextSibling {
return fmt.Errorf("html: inconsistent parent/next relationship")
}
parentHasNAsAChild := false
for c := n.Parent.FirstChild; c != nil; c = c.NextSibling {
if c == n {
parentHasNAsAChild = true
break
}
}
if !parentHasNAsAChild {
return fmt.Errorf("html: inconsistent parent/child relationship")
}
}
if n.PrevSibling != nil && n.PrevSibling.NextSibling != n {
return fmt.Errorf("html: inconsistent prev/next relationship")
}
if n.NextSibling != nil && n.NextSibling.PrevSibling != n {
return fmt.Errorf("html: inconsistent next/prev relationship")
}
if (n.FirstChild == nil) != (n.LastChild == nil) {
return fmt.Errorf("html: inconsistent first/last relationship")
}
if n.FirstChild != nil && n.FirstChild == n.LastChild {
// We have a sole child.
if n.FirstChild.PrevSibling != nil || n.FirstChild.NextSibling != nil {
return fmt.Errorf("html: inconsistent sole child's sibling relationship")
}
}
seen := map[*Node]bool{}
var last *Node
for c := n.FirstChild; c != nil; c = c.NextSibling {
if seen[c] {
return fmt.Errorf("html: inconsistent repeated child")
}
seen[c] = true
last = c
}
if last != n.LastChild {
return fmt.Errorf("html: inconsistent last relationship")
}
var first *Node
for c := n.LastChild; c != nil; c = c.PrevSibling {
if !seen[c] {
return fmt.Errorf("html: inconsistent missing child")
}
delete(seen, c)
first = c
}
if first != n.FirstChild {
return fmt.Errorf("html: inconsistent first relationship")
}
if len(seen) != 0 {
return fmt.Errorf("html: inconsistent forwards/backwards child list")
}
return nil
}