48 lines
1,016 B
Go
48 lines
1,016 B
Go
// Copyright (c) 2018 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package stempel
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import (
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"io"
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)
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type strEnum struct {
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r []rune
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from int
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by int
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}
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func newStrEnum(s []rune, up bool) *strEnum {
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rv := &strEnum{
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r: s,
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}
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if up {
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rv.from = 0
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rv.by = 1
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} else {
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rv.from = len(s) - 1
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rv.by = -1
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}
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return rv
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}
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func (s *strEnum) next() (rune, error) {
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if s.from < 0 || s.from >= len(s.r) {
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return 0, io.EOF
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}
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rv := s.r[s.from]
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s.from += s.by
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return rv, nil
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}
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