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parser.go
93 lines (77 loc) · 1.28 KB
/
parser.go
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package parser
import (
"errors"
)
var (
ParseEnv bool = false
ParseBacktick bool = false
)
func isSpace(r rune) bool {
switch r {
case ' ', '\t', '\r', '\n':
return true
}
return false
}
type Parser struct {
}
func NewParser() *Parser {
return &Parser{}
}
func (p *Parser) Parse(line string) ([]string, error) {
args := []string{}
buf := ""
var escaped, doubleQuoted, singleQuoted bool
got := false
for _, r := range line {
if escaped {
buf += string(r)
escaped = false
continue
}
if r == '\\' {
escaped = true
continue
}
if isSpace(r) {
if singleQuoted || doubleQuoted {
buf += string(r)
} else if got {
args = append(args, buf)
buf = ""
got = false
}
continue
}
switch r {
case '"':
if !singleQuoted {
if doubleQuoted {
got = true
}
doubleQuoted = !doubleQuoted
continue
}
case '\'':
if !doubleQuoted {
if singleQuoted {
got = true
}
singleQuoted = !singleQuoted
continue
}
}
got = true
buf += string(r)
}
if got {
args = append(args, buf)
}
if escaped || singleQuoted || doubleQuoted {
return nil, errors.New("invalid command line string")
}
return args, nil
}
func Parse(line string) ([]string, error) {
return NewParser().Parse(line)
}