示例#1
0
文件: peg.go 项目: darkgray1981/bwl
func (self *quantifiedExpr) Match(m Position) (Position, interface{}) {
	var item interface{}
	cur := m
	res := new(vector.Vector)
	// guaranteed minimum
	for i := 0; i < self.min; i++ {
		cur, item = self.e.Match(cur)
		if cur.Failed() {
			return cur, nil
		}
		res.Push(item)
	}
	last := cur
	// optional (up to a maximum)
	for i := self.min; self.max == -1 || i < self.max; i++ {
		cur, item = self.e.Match(last)
		if cur.Failed() {
			return last, []interface{}(*res.Slice(0, res.Len()))
		}
		res.Push(item)
		last = cur
	}
	return cur, []interface{}(*res.Slice(0, res.Len()))
}