| 1 | package config |
| 2 | |
| 3 | import ( |
| 4 | "strconv" |
| 5 | "strings" |
| 6 | ) |
| 7 | |
| 8 | func isTOMLKeyAssignment(line, key string) bool { |
| 9 | trimmed := strings.TrimSpace(line) |
| 10 | if strings.HasPrefix(trimmed, "#") { |
| 11 | return false |
| 12 | } |
| 13 | got, ok := tomlAssignmentKey(trimmed) |
| 14 | return ok && got == key |
| 15 | } |
| 16 | |
| 17 | // tomlAssignmentKey returns the simple key on a single TOML assignment line. |
| 18 | // It accepts bare keys and both TOML quoted-key forms while leaving dotted |
| 19 | // keys, malformed lines, and values containing an equals sign to the parser. |
| 20 | func tomlAssignmentKey(line string) (string, bool) { |
| 21 | line = strings.TrimSpace(line) |
| 22 | if line == "" || strings.HasPrefix(line, "#") { |
| 23 | return "", false |
| 24 | } |
| 25 | |
| 26 | var key string |
| 27 | switch line[0] { |
| 28 | case '"': |
| 29 | end := 1 |
| 30 | escaped := false |
| 31 | for end < len(line) { |
| 32 | if escaped { |
| 33 | escaped = false |
| 34 | end++ |
| 35 | continue |
| 36 | } |
| 37 | switch line[end] { |
| 38 | case '\\': |
| 39 | escaped = true |
| 40 | case '"': |
| 41 | decoded, err := strconv.Unquote(line[:end+1]) |
| 42 | if err != nil { |
| 43 | return "", false |
| 44 | } |
| 45 | key = decoded |
| 46 | line = line[end+1:] |
| 47 | goto assignment |
| 48 | } |
| 49 | end++ |
| 50 | } |
| 51 | return "", false |
| 52 | case '\'': |
| 53 | end := strings.IndexByte(line[1:], '\'') |
| 54 | if end < 0 { |
| 55 | return "", false |
| 56 | } |
| 57 | end++ |
| 58 | key = line[1:end] |
| 59 | line = line[end+1:] |
| 60 | default: |
| 61 | end := 0 |
| 62 | for end < len(line) && line[end] != '=' && line[end] != ' ' && line[end] != '\t' { |
| 63 | end++ |
| 64 | } |
| 65 | if end == 0 { |
| 66 | return "", false |
| 67 | } |
| 68 | key = line[:end] |
| 69 | line = line[end:] |
| 70 | } |
| 71 | |
| 72 | assignment: |
| 73 | line = strings.TrimSpace(line) |
| 74 | if !strings.HasPrefix(line, "=") || strings.Contains(key, ".") { |
| 75 | return "", false |
| 76 | } |
| 77 | return key, true |
| 78 | } |
| 79 |