mirror of
https://github.com/tickstep/aliyunpan.git
synced 2025-01-23 14:32:14 +08:00
98 lines
2.4 KiB
Go
98 lines
2.4 KiB
Go
// Copyright (c) 2020 tickstep.
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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 args
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import (
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"strings"
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"unicode"
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)
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const (
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CharEscape = '\\'
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CharSingleQuote = '\''
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CharDoubleQuote = '"'
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CharBackQuote = '`'
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)
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// IsQuote 是否为引号
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func IsQuote(r rune) bool {
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return r == CharSingleQuote || r == CharDoubleQuote || r == CharBackQuote
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}
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// Parse 解析line, 忽略括号
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func Parse(line string) (lineArgs []string) { // 在函数中定义的返回值变量，会自动赋为 zero-value，即相当于 var lineArgs string[]
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var (
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rl = []rune(line + " ")
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buf = strings.Builder{}
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quoteChar rune
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nextChar rune
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escaped bool
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in bool
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)
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var (
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isSpace bool
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)
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for k, r := range rl {
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isSpace = unicode.IsSpace(r)
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if !isSpace && !in {
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in = true
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}
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switch {
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case escaped: // 已转义, 跳过
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escaped = false
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//pass
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case r == CharEscape: // 转义模式
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if k+1+1 < len(rl) { // 不是最后一个字符, 多+1是因为最后一个空格
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nextChar = rl[k+1]
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// 仅支持转义这些字符, 否则原样输出反斜杠
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if unicode.IsSpace(nextChar) || IsQuote(nextChar) || nextChar == CharEscape {
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escaped = true
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continue
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}
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}
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// pass
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case IsQuote(r):
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if quoteChar == 0 { //未引
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quoteChar = r
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continue
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}
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if quoteChar == r { //取消引
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quoteChar = 0
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continue
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}
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case isSpace:
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if !in { // 忽略多余的空格
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continue
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}
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if quoteChar == 0 { // 未在引号内
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lineArgs = append(lineArgs, buf.String())
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buf.Reset()
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in = false
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continue
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}
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}
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buf.WriteRune(r)
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}
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// Go 允许在定义函数时，命名返回值，当然这些变量可以在函数中使用。
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// 在 return 语句中，无需显示的返回这些值，Go 会自动将其返回。当然 return 语句还是必须要写的，否则编译器会报错。
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// 相当于 return lineArgs
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return
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}
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