// 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")
}
// Walk functions step through the major pieces of the template structure,
// generating output as they go.
func (s *state) walk(dot reflect.Value, node parse.Node) {
s.at(node)
switch node := node.(type) {
case *parse.ActionNode:
// Do not pop variables so they persist until next end.
// Also, if the action declares variables, don't print the result.
val := s.evalPipeline(dot, node.Pipe)
if len(node.Pipe.Decl) == 0 {
s.visitValue(node, val)
}
case *parse.IfNode:
s.walkIfOrWith(parse.NodeIf, dot, node.Pipe, node.List, node.ElseList)
case *parse.ListNode:
for _, node := range node.Nodes {
s.walk(dot, node)
}
case *parse.RangeNode:
s.walkRange(dot, node)
case *parse.TemplateNode:
s.walkTemplate(dot, node)
case *parse.TextNode:
s.v.Visit(node.String())
case *parse.WithNode:
s.walkIfOrWith(parse.NodeWith, dot, node.Pipe, node.List, node.ElseList)
default:
s.errorf("unknown node: %s", node)
}
}
// escape escapes a template node.
func (e *escaper) escape(c context, n parse.Node) context {
switch n := n.(type) {
case *parse.ActionNode:
return e.escapeAction(c, n)
case *parse.IfNode:
return e.escapeBranch(c, &n.BranchNode, "if")
case *parse.ListNode:
return e.escapeList(c, n)
case *parse.RangeNode:
return e.escapeBranch(c, &n.BranchNode, "range")
case *parse.TemplateNode:
return e.escapeTemplate(c, n)
case *parse.TextNode:
return e.escapeText(c, n)
case *parse.WithNode:
return e.escapeBranch(c, &n.BranchNode, "with")
}
panic("escaping " + n.String() + " is unimplemented")
}
// IsPseudoFunction returns true iff n is a *parse.ActionNode
// consisting solely of a fn call without any arguments.
func IsPseudoFunction(n parse.Node, fn string) bool {
return n.Type() == parse.NodeAction && n.String() == leftDelim+fn+rightDelim
}