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|
package shellwords
import (
"errors"
"os"
"regexp"
"strings"
)
var (
ParseEnv bool = false
ParseBacktick bool = false
)
var envRe = regexp.MustCompile(`\$({[a-zA-Z0-9_]+}|[a-zA-Z0-9_]+)`)
func isSpace(r rune) bool {
switch r {
case ' ', '\t', '\r', '\n':
return true
}
return false
}
func replaceEnv(getenv func(string) string, s string) string {
if getenv == nil {
getenv = os.Getenv
}
return envRe.ReplaceAllStringFunc(s, func(s string) string {
s = s[1:]
if s[0] == '{' {
s = s[1 : len(s)-1]
}
return getenv(s)
})
}
type Parser struct {
ParseEnv bool
ParseBacktick bool
Position int
Dir string
// If ParseEnv is true, use this for getenv.
// If nil, use os.Getenv.
Getenv func(string) string
}
func NewParser() *Parser {
return &Parser{
ParseEnv: ParseEnv,
ParseBacktick: ParseBacktick,
Position: 0,
Dir: "",
}
}
func (p *Parser) Parse(line string) ([]string, error) {
args := []string{}
buf := ""
var escaped, doubleQuoted, singleQuoted, backQuote, dollarQuote bool
backtick := ""
pos := -1
got := false
loop:
for i, r := range line {
if escaped {
buf += string(r)
escaped = false
continue
}
if r == '\\' {
if singleQuoted {
buf += string(r)
} else {
escaped = true
}
continue
}
if isSpace(r) {
if singleQuoted || doubleQuoted || backQuote || dollarQuote {
buf += string(r)
backtick += string(r)
} else if got {
if p.ParseEnv {
parser := &Parser{ParseEnv: false, ParseBacktick: false, Position: 0, Dir: p.Dir}
strs, err := parser.Parse(replaceEnv(p.Getenv, buf))
if err != nil {
return nil, err
}
for _, str := range strs {
args = append(args, str)
}
} else {
args = append(args, buf)
}
buf = ""
got = false
}
continue
}
switch r {
case '`':
if !singleQuoted && !doubleQuoted && !dollarQuote {
if p.ParseBacktick {
if backQuote {
out, err := shellRun(backtick, p.Dir)
if err != nil {
return nil, err
}
buf = buf[:len(buf)-len(backtick)] + out
}
backtick = ""
backQuote = !backQuote
continue
}
backtick = ""
backQuote = !backQuote
}
case ')':
if !singleQuoted && !doubleQuoted && !backQuote {
if p.ParseBacktick {
if dollarQuote {
out, err := shellRun(backtick, p.Dir)
if err != nil {
return nil, err
}
buf = buf[:len(buf)-len(backtick)-2] + out
}
backtick = ""
dollarQuote = !dollarQuote
continue
}
backtick = ""
dollarQuote = !dollarQuote
}
case '(':
if !singleQuoted && !doubleQuoted && !backQuote {
if !dollarQuote && strings.HasSuffix(buf, "$") {
dollarQuote = true
buf += "("
continue
} else {
return nil, errors.New("invalid command line string")
}
}
case '"':
if !singleQuoted && !dollarQuote {
if doubleQuoted {
got = true
}
doubleQuoted = !doubleQuoted
continue
}
case '\'':
if !doubleQuoted && !dollarQuote {
if singleQuoted {
got = true
}
singleQuoted = !singleQuoted
continue
}
case ';', '&', '|', '<', '>':
if !(escaped || singleQuoted || doubleQuoted || backQuote || dollarQuote) {
if r == '>' && len(buf) > 0 {
if c := buf[0]; '0' <= c && c <= '9' {
i -= 1
got = false
}
}
pos = i
break loop
}
}
got = true
buf += string(r)
if backQuote || dollarQuote {
backtick += string(r)
}
}
if got {
if p.ParseEnv {
parser := &Parser{ParseEnv: false, ParseBacktick: false, Position: 0, Dir: p.Dir}
strs, err := parser.Parse(replaceEnv(p.Getenv, buf))
if err != nil {
return nil, err
}
for _, str := range strs {
args = append(args, str)
}
} else {
args = append(args, buf)
}
}
if escaped || singleQuoted || doubleQuoted || backQuote || dollarQuote {
return nil, errors.New("invalid command line string")
}
p.Position = pos
return args, nil
}
func Parse(line string) ([]string, error) {
return NewParser().Parse(line)
}
|
