Method parseStep

parse.go:406–439

Step ::= AxisSpecifier NodeTest Predicate* | AbbreviatedStep

(n node)

// Step	::= AxisSpecifier NodeTest Predicate* | AbbreviatedStep
func (p *parser) parseStep(n node) (opnd node) {
	if p.r.typ == itemDot || p.r.typ == itemDotDot {
		if p.r.typ == itemDot {
			opnd = newAxisNode("self", allNode, "", "", "", n)
		} else {
			opnd = newAxisNode("parent", allNode, "", "", "", n)
		}
		p.next()
		if p.r.typ != itemLBracket {
			return opnd
		}
	} else {
		axisType := "child" // default axes value.
		switch p.r.typ {
		case itemAt:
			axisType = "attribute"
			p.next()
		case itemAxe:
			axisType = p.r.name
			p.next()
		case itemLParens:
			return p.parseSequence(n)
		}
		matchType := ElementNode
		if axisType == "attribute" {
			matchType = AttributeNode
		}
		opnd = p.parseNodeTest(n, axisType, matchType)
	}
	for p.r.typ == itemLBracket {
		opnd = newFilterNode(opnd, p.parsePredicate(opnd))
	}
	return opnd
}

// Expr ::= '(' Step ("," Step)* ')'
func (p *parser) parseSequence(n node) (opnd node) {