(s string)
| 25 | } |
| 26 | |
| 27 | func parseCommand(s string) (*command, error) { |
| 28 | s = strings.TrimSpace(s) |
| 29 | if len(s) < 2 || s[0] != '(' || s[len(s)-1] != ')' { |
| 30 | return nil, errors.New("argument list should be in parenthesis") |
| 31 | } |
| 32 | |
| 33 | args, err := fields(s[1 : len(s)-1]) |
| 34 | if err != nil { |
| 35 | return nil, err |
| 36 | } |
| 37 | if len(args) == 0 { |
| 38 | return nil, errors.New("missing file name") |
| 39 | } |
| 40 | |
| 41 | cmd := &command{path: args[0]} |
| 42 | args = args[1:] |
| 43 | if len(args) > 0 && args[0][0] != '/' { |
| 44 | cmd.lang, args = args[0], args[1:] |
| 45 | } else { |
| 46 | ext := filepath.Ext(cmd.path[1:]) |
| 47 | if len(ext) == 0 { |
| 48 | return nil, errors.New("language is required when file has no extension") |
| 49 | } |
| 50 | cmd.lang = ext[1:] |
| 51 | } |
| 52 | |
| 53 | switch { |
| 54 | case len(args) == 1: |
| 55 | cmd.start = &args[0] |
| 56 | case len(args) == 2: |
| 57 | cmd.start, cmd.end = &args[0], &args[1] |
| 58 | case len(args) > 2: |
| 59 | return nil, errors.New("too many arguments") |
| 60 | } |
| 61 | |
| 62 | return cmd, nil |
| 63 | } |
| 64 | |
| 65 | // fields returns a list of the groups of text separated by blanks, |
| 66 | // keeping all text surrounded by / as a group. |
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