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// Copyright 2011 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 template
import (
"text/template/parse"
)
// clone clones a template Node.
func clone(n parse.Node) parse.Node {
switch t := n.(type) {
case *parse.ActionNode:
return cloneAction(t)
case *parse.IfNode:
b := new(parse.IfNode)
copyBranch(&b.BranchNode, &t.BranchNode)
return b
case *parse.ListNode:
return cloneList(t)
case *parse.RangeNode:
b := new(parse.RangeNode)
copyBranch(&b.BranchNode, &t.BranchNode)
return b
case *parse.TemplateNode:
return cloneTemplate(t)
case *parse.TextNode:
return cloneText(t)
case *parse.WithNode:
b := new(parse.WithNode)
copyBranch(&b.BranchNode, &t.BranchNode)
return b
}
panic("cloning " + n.String() + " is unimplemented")
}
// cloneAction returns a deep clone of n.
func cloneAction(n *parse.ActionNode) *parse.ActionNode {
// We use keyless fields because they won't compile if a field is added.
return &parse.ActionNode{n.NodeType, n.Line, clonePipe(n.Pipe)}
}
// cloneList returns a deep clone of n.
func cloneList(n *parse.ListNode) *parse.ListNode {
if n == nil {
return nil
}
// We use keyless fields because they won't compile if a field is added.
c := parse.ListNode{n.NodeType, make([]parse.Node, len(n.Nodes))}
for i, child := range n.Nodes {
c.Nodes[i] = clone(child)
}
return &c
}
// clonePipe returns a shallow clone of n.
// The escaper does not modify pipe descendants in place so there's no need to
// clone deeply.
func clonePipe(n *parse.PipeNode) *parse.PipeNode {
if n == nil {
return nil
}
// We use keyless fields because they won't compile if a field is added.
return &parse.PipeNode{n.NodeType, n.Line, n.Decl, n.Cmds}
}
// cloneTemplate returns a deep clone of n.
func cloneTemplate(n *parse.TemplateNode) *parse.TemplateNode {
// We use keyless fields because they won't compile if a field is added.
return &parse.TemplateNode{n.NodeType, n.Line, n.Name, clonePipe(n.Pipe)}
}
// cloneText clones the given node sharing its []byte.
func cloneText(n *parse.TextNode) *parse.TextNode {
// We use keyless fields because they won't compile if a field is added.
return &parse.TextNode{n.NodeType, n.Text}
}
// copyBranch clones src into dst.
func copyBranch(dst, src *parse.BranchNode) {
// We use keyless fields because they won't compile if a field is added.
*dst = parse.BranchNode{
src.NodeType,
src.Line,
clonePipe(src.Pipe),
cloneList(src.List),
cloneList(src.ElseList),
}
}
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