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args.go
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args.go
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package args
import (
"strings"
"unicode"
)
const (
CharEscape = '\\'
CharSingleQuote = '\''
CharDoubleQuote = '"'
CharBackQuote = '`'
)
// IsQuote 是否为引号
func IsQuote(r rune) bool {
return r == CharSingleQuote || r == CharDoubleQuote || r == CharBackQuote
}
// Parse 解析line, 忽略括号
func Parse(line string) (lineArgs []string) {
var (
rl = []rune(line + " ")
buf = strings.Builder{}
quoteChar rune
nextChar rune
escaped bool
in bool
)
var (
isSpace bool
)
for k, r := range rl {
isSpace = unicode.IsSpace(r)
if !isSpace && !in {
in = true
}
switch {
case escaped: // 已转义, 跳过
escaped = false
//pass
case r == CharEscape: // 转义模式
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
nextChar = rl[k+1]
// 仅支持转义这些字符, 否则原样输出反斜杠
if unicode.IsSpace(nextChar) || IsQuote(nextChar) || nextChar == CharEscape {
escaped = true
continue
}
}
// pass
case IsQuote(r):
if quoteChar == 0 { //未引
quoteChar = r
continue
}
if quoteChar == r { //取消引
quoteChar = 0
continue
}
case isSpace:
if !in { // 忽略多余的空格
continue
}
if quoteChar == 0 { // 未在引号内
lineArgs = append(lineArgs, buf.String())
buf.Reset()
in = false
continue
}
}
buf.WriteRune(r)
}
return
}