Method parsePrimaryExpr

parse.go:517–543

PrimaryExpr ::= VariableReference | '(' Expr ')' | Literal | Number | FunctionCall

(n node)

// PrimaryExpr ::= VariableReference | '(' Expr ')'	| Literal | Number | FunctionCall
func (p *parser) parsePrimaryExpr(n node) (opnd node) {
	switch p.r.typ {
	case itemString:
		opnd = newOperandNode(p.r.strval)
		p.next()
	case itemNumber:
		opnd = newOperandNode(p.r.numval)
		p.next()
	case itemDollar:
		p.next()
		checkItem(p.r, itemName)
		opnd = newVariableNode(p.r.prefix, p.r.name)
		p.next()
	case itemLParens:
		p.next()
		opnd = p.parseExpression(n)
		if opnd.Type() != nodeConstantOperand {
			opnd = newGroupNode(opnd)
		}
		p.skipItem(itemRParens)
	case itemName:
		if p.r.canBeFunc && !isNodeType(p.r) {
			opnd = p.parseMethod(nil)
		}
	}
	return opnd
}

// FunctionCall	 ::=  FunctionName '(' ( Argument ( ',' Argument )* )? ')'
func (p *parser) parseMethod(n node) node {