Method processFunction

build.go:301–601

processFunctionNode processes query for the XPath function node.

(root *functionNode, props *builderProp)

// processFunctionNode processes query for the XPath function node.
func (b *builder) processFunction(root *functionNode, props *builderProp) (query, error) {
	// Reset builder props
	*props = builderProps.None

	var qyOutput query
	switch root.FuncName {
	case "lower-case":
		arg, err := b.processNode(root.Args[0], flagsEnum.None, props)
		if err != nil {
			return nil, err
		}
		qyOutput = &functionQuery{Func: lowerCaseFunc(arg)}
	case "starts-with":
		arg1, err := b.processNode(root.Args[0], flagsEnum.None, props)
		if err != nil {
			return nil, err
		}
		arg2, err := b.processNode(root.Args[1], flagsEnum.None, props)
		if err != nil {
			return nil, err
		}
		qyOutput = &functionQuery{Func: startwithFunc(arg1, arg2)}
	case "ends-with":
		arg1, err := b.processNode(root.Args[0], flagsEnum.None, props)
		if err != nil {
			return nil, err
		}
		arg2, err := b.processNode(root.Args[1], flagsEnum.None, props)
		if err != nil {
			return nil, err
		}
		qyOutput = &functionQuery{Func: endwithFunc(arg1, arg2)}
	case "contains":
		arg1, err := b.processNode(root.Args[0], flagsEnum.None, props)
		if err != nil {
			return nil, err
		}
		arg2, err := b.processNode(root.Args[1], flagsEnum.None, props)
		if err != nil {
			return nil, err
		}
		qyOutput = &functionQuery{Func: containsFunc(arg1, arg2)}
	case "matches":
		//matches(string , pattern)
		if len(root.Args) != 2 {
			return nil, errors.New("xpath: matches function must have two parameters")
		}
		var (
			arg1, arg2 query
			err        error
		)
		if arg1, err = b.processNode(root.Args[0], flagsEnum.None, props); err != nil {
			return nil, err
		}
		if arg2, err = b.processNode(root.Args[1], flagsEnum.None, props); err != nil {
			return nil, err
		}
		// Issue #92, testing the regular expression before.