cloudflare/pint
Publicmirrored from https://github.com/cloudflare/pintAvailable
internal/comments/comments.go
360lines · modecode
| 1 | package comments |
| 2 | |
| 3 | import ( |
| 4 | "bufio" |
| 5 | "fmt" |
| 6 | "strings" |
| 7 | "time" |
| 8 | "unicode" |
| 9 | |
| 10 | "github.com/cloudflare/pint/internal/diags" |
| 11 | ) |
| 12 | |
| 13 | type Type uint8 |
| 14 | |
| 15 | const ( |
| 16 | UnknownType Type = iota |
| 17 | InvalidComment |
| 18 | IgnoreFileType // ignore/file |
| 19 | IgnoreLineType // ignore/line |
| 20 | IgnoreBeginType // ignore/begin |
| 21 | IgnoreEndType // ignore/end |
| 22 | IgnoreNextLineType // ignore/next-line |
| 23 | FileOwnerType // file/owner |
| 24 | RuleOwnerType // rule/owner |
| 25 | FileDisableType // file/disable |
| 26 | DisableType // disable |
| 27 | FileSnoozeType // file/snooze |
| 28 | SnoozeType // snooze |
| 29 | RuleSetType // rule/set |
| 30 | ) |
| 31 | |
| 32 | var ( |
| 33 | Prefix = "pint" |
| 34 | |
| 35 | IgnoreFileComment = "ignore/file" |
| 36 | IgnoreLineComment = "ignore/line" |
| 37 | IgnoreBeginComment = "ignore/begin" |
| 38 | IgnoreEndComment = "ignore/end" |
| 39 | IgnoreNextLineComment = "ignore/next-line" |
| 40 | FileOwnerComment = "file/owner" |
| 41 | RuleOwnerComment = "rule/owner" |
| 42 | FileDisableComment = "file/disable" |
| 43 | DisableComment = "disable" |
| 44 | FileSnoozeComment = "file/snooze" |
| 45 | SnoozeComment = "snooze" |
| 46 | RuleSetComment = "rule/set" |
| 47 | ) |
| 48 | |
| 49 | type CommentValue interface { |
| 50 | String() string |
| 51 | } |
| 52 | |
| 53 | type Comment struct { |
| 54 | Value CommentValue |
| 55 | Type Type |
| 56 | Offset int |
| 57 | } |
| 58 | |
| 59 | func parseType(s string) Type { |
| 60 | switch s { |
| 61 | case IgnoreFileComment: |
| 62 | return IgnoreFileType |
| 63 | case IgnoreLineComment: |
| 64 | return IgnoreLineType |
| 65 | case IgnoreBeginComment: |
| 66 | return IgnoreBeginType |
| 67 | case IgnoreEndComment: |
| 68 | return IgnoreEndType |
| 69 | case IgnoreNextLineComment: |
| 70 | return IgnoreNextLineType |
| 71 | case FileOwnerComment: |
| 72 | return FileOwnerType |
| 73 | case RuleOwnerComment: |
| 74 | return RuleOwnerType |
| 75 | case FileDisableComment: |
| 76 | return FileDisableType |
| 77 | case DisableComment: |
| 78 | return DisableType |
| 79 | case FileSnoozeComment: |
| 80 | return FileSnoozeType |
| 81 | case SnoozeComment: |
| 82 | return SnoozeType |
| 83 | case RuleSetComment: |
| 84 | return RuleSetType |
| 85 | default: |
| 86 | return UnknownType |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | type CommentError struct { |
| 91 | Diagnostic diags.Diagnostic |
| 92 | } |
| 93 | |
| 94 | func (ce CommentError) Error() string { |
| 95 | return ce.Diagnostic.Message |
| 96 | } |
| 97 | |
| 98 | type OwnerError struct { |
| 99 | Diagnostic diags.Diagnostic |
| 100 | } |
| 101 | |
| 102 | func (oe OwnerError) Error() string { |
| 103 | return oe.Diagnostic.Message |
| 104 | } |
| 105 | |
| 106 | type Invalid struct { |
| 107 | Err CommentError |
| 108 | } |
| 109 | |
| 110 | func (i Invalid) String() string { |
| 111 | return i.Err.Error() |
| 112 | } |
| 113 | |
| 114 | type Owner struct { |
| 115 | Name string |
| 116 | Line int |
| 117 | } |
| 118 | |
| 119 | func (o Owner) String() string { |
| 120 | return o.Name |
| 121 | } |
| 122 | |
| 123 | type Disable struct { |
| 124 | Match string |
| 125 | } |
| 126 | |
| 127 | func (d Disable) String() string { |
| 128 | return d.Match |
| 129 | } |
| 130 | |
| 131 | type Snooze struct { |
| 132 | Until time.Time |
| 133 | Match string |
| 134 | } |
| 135 | |
| 136 | func (s Snooze) String() string { |
| 137 | return fmt.Sprintf("%s %s", s.Until.Format(time.RFC3339), s.Match) |
| 138 | } |
| 139 | |
| 140 | type RuleSet struct { |
| 141 | Value string |
| 142 | } |
| 143 | |
| 144 | func (r RuleSet) String() string { |
| 145 | return r.Value |
| 146 | } |
| 147 | |
| 148 | func parseSnooze(s string) (snz Snooze, err error) { |
| 149 | parts := strings.SplitN(s, " ", 2) |
| 150 | if len(parts) != 2 { |
| 151 | return Snooze{}, fmt.Errorf("invalid snooze comment, expected '$TIME $MATCH' got %q", s) |
| 152 | } |
| 153 | |
| 154 | snz.Match = parts[1] |
| 155 | snz.Until, err = time.Parse(time.RFC3339, parts[0]) |
| 156 | if err != nil { |
| 157 | snz.Until, err = time.Parse("2006-01-02", parts[0]) |
| 158 | } |
| 159 | if err != nil { |
| 160 | return snz, fmt.Errorf("invalid snooze timestamp: %w", err) |
| 161 | } |
| 162 | return snz, nil |
| 163 | } |
| 164 | |
| 165 | func parseValue(typ Type, s string, line int) (CommentValue, error) { |
| 166 | switch typ { |
| 167 | case IgnoreFileType, IgnoreLineType, IgnoreBeginType, IgnoreEndType, IgnoreNextLineType: |
| 168 | if s != "" { |
| 169 | return nil, fmt.Errorf("unexpected comment suffix: %q", s) |
| 170 | } |
| 171 | case FileOwnerType: |
| 172 | if s == "" { |
| 173 | return nil, fmt.Errorf("missing %s value", FileOwnerComment) |
| 174 | } |
| 175 | return Owner{Name: s, Line: line}, nil |
| 176 | case RuleOwnerType: |
| 177 | if s == "" { |
| 178 | return nil, fmt.Errorf("missing %s value", RuleOwnerComment) |
| 179 | } |
| 180 | return Owner{Name: s, Line: 0}, nil // comment attached to the rule, line numbers are unreliable |
| 181 | case FileDisableType: |
| 182 | if s == "" { |
| 183 | return nil, fmt.Errorf("missing %s value", FileDisableComment) |
| 184 | } |
| 185 | return Disable{Match: s}, nil |
| 186 | case DisableType: |
| 187 | if s == "" { |
| 188 | return nil, fmt.Errorf("missing %s value", DisableComment) |
| 189 | } |
| 190 | return Disable{Match: s}, nil |
| 191 | case FileSnoozeType: |
| 192 | if s == "" { |
| 193 | return nil, fmt.Errorf("missing %s value", FileSnoozeComment) |
| 194 | } |
| 195 | return parseSnooze(s) |
| 196 | case SnoozeType: |
| 197 | if s == "" { |
| 198 | return nil, fmt.Errorf("missing %s value", SnoozeComment) |
| 199 | } |
| 200 | return parseSnooze(s) |
| 201 | case RuleSetType: |
| 202 | if s == "" { |
| 203 | return nil, fmt.Errorf("missing %s value", RuleSetComment) |
| 204 | } |
| 205 | return RuleSet{Value: s}, nil |
| 206 | case UnknownType, InvalidComment: |
| 207 | // pass |
| 208 | } |
| 209 | return nil, nil |
| 210 | } |
| 211 | |
| 212 | const ( |
| 213 | needsHash uint8 = iota |
| 214 | needsPrefix |
| 215 | readsPrefix |
| 216 | needsType |
| 217 | readsType |
| 218 | needsValue |
| 219 | readsValue |
| 220 | ) |
| 221 | |
| 222 | func parseComment(s string, line int) (parsed []Comment) { |
| 223 | var err error |
| 224 | var buf strings.Builder |
| 225 | var c Comment |
| 226 | |
| 227 | state := needsHash |
| 228 | for i, r := range s + "\n" { |
| 229 | READRUNE: |
| 230 | switch state { |
| 231 | case needsHash: |
| 232 | if r != '#' { |
| 233 | goto NEXT |
| 234 | } |
| 235 | state = needsPrefix |
| 236 | buf.Reset() |
| 237 | c.Type = UnknownType |
| 238 | c.Value = nil |
| 239 | c.Offset = i |
| 240 | case needsPrefix: |
| 241 | if unicode.IsSpace(r) { |
| 242 | goto NEXT |
| 243 | } |
| 244 | state = readsPrefix |
| 245 | goto READRUNE |
| 246 | case readsPrefix: |
| 247 | if unicode.IsLetter(r) { |
| 248 | _, _ = buf.WriteRune(r) |
| 249 | goto NEXT |
| 250 | } |
| 251 | if unicode.IsSpace(r) { |
| 252 | // Invalid comment prefix, ignore this comment. |
| 253 | if buf.String() != Prefix { |
| 254 | buf.Reset() |
| 255 | state = needsHash |
| 256 | goto NEXT |
| 257 | } |
| 258 | buf.Reset() |
| 259 | state = needsType |
| 260 | goto NEXT |
| 261 | } |
| 262 | // Invalid character in the prefix, ignore this comment. |
| 263 | state = needsHash |
| 264 | case needsType: |
| 265 | if r == '#' { |
| 266 | state = needsHash |
| 267 | goto READRUNE |
| 268 | } |
| 269 | if unicode.IsSpace(r) { |
| 270 | goto NEXT |
| 271 | } |
| 272 | state = readsType |
| 273 | goto READRUNE |
| 274 | case readsType: |
| 275 | if unicode.IsLetter(r) || r == '/' || r == '-' { |
| 276 | _, _ = buf.WriteRune(r) |
| 277 | goto NEXT |
| 278 | } |
| 279 | if unicode.IsSpace(r) || r == '\n' { |
| 280 | c.Type = parseType(buf.String()) |
| 281 | buf.Reset() |
| 282 | if c.Type == UnknownType { |
| 283 | state = needsHash |
| 284 | } else { |
| 285 | state = needsValue |
| 286 | } |
| 287 | |
| 288 | } |
| 289 | case needsValue: |
| 290 | if unicode.IsSpace(r) { |
| 291 | goto NEXT |
| 292 | } |
| 293 | state = readsValue |
| 294 | goto READRUNE |
| 295 | case readsValue: |
| 296 | if r == '\n' { |
| 297 | goto NEXT |
| 298 | } |
| 299 | _, _ = buf.WriteRune(r) |
| 300 | } |
| 301 | NEXT: |
| 302 | } |
| 303 | |
| 304 | if c.Type != UnknownType { |
| 305 | c.Value, err = parseValue(c.Type, strings.TrimSpace(buf.String()), line) |
| 306 | if err != nil { |
| 307 | c.Type = InvalidComment |
| 308 | c.Value = Invalid{ |
| 309 | Err: CommentError{ |
| 310 | Diagnostic: diags.Diagnostic{ |
| 311 | Message: "This comment is not a valid pint control comment: " + err.Error(), |
| 312 | Pos: diags.PositionRanges{ |
| 313 | { |
| 314 | Line: line, |
| 315 | FirstColumn: c.Offset + 1, |
| 316 | LastColumn: len(s), |
| 317 | }, |
| 318 | }, |
| 319 | FirstColumn: 1, |
| 320 | LastColumn: len(s), |
| 321 | }, |
| 322 | }, |
| 323 | } |
| 324 | } |
| 325 | parsed = append(parsed, c) |
| 326 | } |
| 327 | |
| 328 | return parsed |
| 329 | } |
| 330 | |
| 331 | func Parse(lineno int, text string) (comments []Comment) { |
| 332 | sc := bufio.NewScanner(strings.NewReader(text)) |
| 333 | var index int |
| 334 | for sc.Scan() { |
| 335 | line := sc.Text() |
| 336 | comments = append(comments, parseComment(line, lineno+index)...) |
| 337 | index++ |
| 338 | } |
| 339 | return comments |
| 340 | } |
| 341 | |
| 342 | func Only[T any](src []Comment, typ Type) []T { |
| 343 | dst := make([]T, 0, len(src)) |
| 344 | for _, c := range src { |
| 345 | if c.Type != typ { |
| 346 | continue |
| 347 | } |
| 348 | dst = append(dst, c.Value.(T)) |
| 349 | } |
| 350 | return dst |
| 351 | } |
| 352 | |
| 353 | func IsRuleComment(typ Type) bool { |
| 354 | // nolint:exhaustive |
| 355 | switch typ { |
| 356 | case RuleOwnerType, DisableType, SnoozeType, RuleSetType: |
| 357 | return true |
| 358 | } |
| 359 | return false |
| 360 | } |
| 361 | |