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|
package shellescape
import (
"strings"
"unicode"
"github.com/juju/errors"
)
func Escape(parts []string) string {
eParts := make([]string, 0, len(parts))
for _, part := range parts {
needEscape := false
for _, r := range part {
if !unicode.IsLetter(r) && !unicode.IsNumber(r) && r != '-' && r != '_' && r != '.' && r != '/' {
needEscape = true
break
}
}
if len(part) == 0 {
needEscape = true
}
if needEscape {
part = "'" + strings.Replace(part, "'", "'\"'\"'", -1) + "'"
}
eParts = append(eParts, part)
}
return strings.Join(eParts, " ")
}
type parserQuoteState int
const (
parserQuoteStateNone parserQuoteState = iota
parserQuoteStateSingle
parserQuoteStateDouble
parserQuoteStateDoubleEscaped
)
func Parse(shellCmd string) ([]string, error) {
var parts []string
partBuilder := strings.Builder{}
inPart := false
quoteState := parserQuoteStateNone
finalizePart := func() {
parts = append(parts, partBuilder.String())
partBuilder.Reset()
}
for _, r := range shellCmd {
// Sanity check, TODO: perhaps remove it
if !inPart && quoteState != parserQuoteStateNone {
panic("should never be here")
}
isSpace := unicode.IsSpace(r)
if !inPart {
if !isSpace {
inPart = true
} else {
// We're in the whitespace, nothing else to do here.
continue
}
}
switch quoteState {
case parserQuoteStateNone:
switch r {
case '\'':
quoteState = parserQuoteStateSingle
case '"':
quoteState = parserQuoteStateDouble
default:
if !isSpace {
partBuilder.WriteRune(r)
} else {
finalizePart()
inPart = false
}
}
case parserQuoteStateSingle:
switch r {
case '\'':
quoteState = parserQuoteStateNone
default:
partBuilder.WriteRune(r)
}
case parserQuoteStateDouble:
switch r {
case '"':
quoteState = parserQuoteStateNone
case '\\':
quoteState = parserQuoteStateDoubleEscaped
default:
partBuilder.WriteRune(r)
}
case parserQuoteStateDoubleEscaped:
switch r {
case '\\':
partBuilder.WriteRune(r)
case '"':
partBuilder.WriteRune(r)
default:
partBuilder.WriteRune('\\')
partBuilder.WriteRune(r)
}
quoteState = parserQuoteStateDouble
}
}
if inPart {
if quoteState != parserQuoteStateNone {
return nil, errors.Errorf("unfinished quote")
}
finalizePart()
}
return parts, nil
}
|
