138 lines
2.1 KiB
Go
138 lines
2.1 KiB
Go
package shellwords
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import (
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"fmt"
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"strings"
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)
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type ErrParse struct {
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Position int
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ErrorStart,
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ErrorPart,
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ErrorEnd string
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}
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func (e ErrParse) Error() string {
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return fmt.Sprintf(
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"Unexpected quote or escape: %s__%s__%s",
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e.ErrorStart, e.ErrorPart, e.ErrorEnd,
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)
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}
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// Parse parses the given text to a slice of words.
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func Parse(line string) ([]string, error) {
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var args []string
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var escaped, doubleQuoted, singleQuoted bool
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var buf strings.Builder
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buf.Grow(len(line))
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got := false
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cursor := 0
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runes := []rune(line)
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for _, r := range runes {
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if escaped {
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buf.WriteRune(r)
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escaped = false
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continue
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}
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if r == '\\' {
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if singleQuoted {
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buf.WriteRune(r)
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} else {
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escaped = true
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}
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continue
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}
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if isSpace(r) {
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switch {
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case singleQuoted, doubleQuoted:
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buf.WriteRune(r)
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case got:
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cursor += buf.Len()
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args = append(args, buf.String())
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buf.Reset()
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got = false
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}
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continue
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}
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switch r {
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case '"':
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if !singleQuoted {
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if doubleQuoted {
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got = true
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}
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doubleQuoted = !doubleQuoted
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continue
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}
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case '\'', '`':
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if !doubleQuoted {
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if singleQuoted {
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got = true
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}
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// // If this is a backtick, then write it.
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// if r == '`' {
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// buf.WriteByte('`')
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// }
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singleQuoted = !singleQuoted
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continue
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}
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}
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got = true
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buf.WriteRune(r)
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}
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if got {
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args = append(args, buf.String())
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}
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if escaped || singleQuoted || doubleQuoted {
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// the number of characters to highlight
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var (
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pos = cursor + 5
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start = string(runes[max(cursor-100, 0) : pos-1])
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end = string(runes[pos+1 : min(cursor+100, len(runes))])
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part = string(runes[max(pos-1, 0):min(len(runes), pos+2)])
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)
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return args, &ErrParse{
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Position: cursor,
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ErrorStart: start,
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ErrorPart: part,
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ErrorEnd: end,
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}
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}
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return args, nil
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}
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func isSpace(r rune) bool {
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switch r {
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case ' ', '\t', '\r', '\n', ' ':
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return true
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}
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return false
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}
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func min(i, j int) int {
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if i < j {
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return i
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}
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return j
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}
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func max(i, j int) int {
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if i < j {
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return j
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}
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return i
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}
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