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package pongo2
import (
"bytes"
)
type tagIfNode struct {
conditions []IEvaluator
wrappers []*NodeWrapper
}
func (node *tagIfNode) Execute(ctx *ExecutionContext, buffer *bytes.Buffer) *Error {
for i, condition := range node.conditions {
result, err := condition.Evaluate(ctx)
if err != nil {
return err
}
if result.IsTrue() {
return node.wrappers[i].Execute(ctx, buffer)
} else {
// Last condition?
if len(node.conditions) == i+1 && len(node.wrappers) > i+1 {
return node.wrappers[i+1].Execute(ctx, buffer)
}
}
}
return nil
}
func tagIfParser(doc *Parser, start *Token, arguments *Parser) (INodeTag, *Error) {
if_node := &tagIfNode{}
// Parse first and main IF condition
condition, err := arguments.ParseExpression()
if err != nil {
return nil, err
}
if_node.conditions = append(if_node.conditions, condition)
if arguments.Remaining() > 0 {
return nil, arguments.Error("If-condition is malformed.", nil)
}
// Check the rest
for {
wrapper, tag_args, err := doc.WrapUntilTag("elif", "else", "endif")
if err != nil {
return nil, err
}
if_node.wrappers = append(if_node.wrappers, wrapper)
if wrapper.Endtag == "elif" {
// elif can take a condition
condition, err := tag_args.ParseExpression()
if err != nil {
return nil, err
}
if_node.conditions = append(if_node.conditions, condition)
if tag_args.Remaining() > 0 {
return nil, tag_args.Error("Elif-condition is malformed.", nil)
}
} else {
if tag_args.Count() > 0 {
// else/endif can't take any conditions
return nil, tag_args.Error("Arguments not allowed here.", nil)
}
}
if wrapper.Endtag == "endif" {
break
}
}
return if_node, nil
}
func init() {
RegisterTag("if", tagIfParser)
}
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