cloudflare/pint
Publicmirrored from https://github.com/cloudflare/pintAvailable
internal/parser/parser.go
658lines · modecode
| 1 | package parser |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "errors" |
| 6 | "fmt" |
| 7 | "io" |
| 8 | "regexp" |
| 9 | "strconv" |
| 10 | "strings" |
| 11 | |
| 12 | "gopkg.in/yaml.v3" |
| 13 | |
| 14 | "github.com/prometheus/common/model" |
| 15 | |
| 16 | "github.com/cloudflare/pint/internal/comments" |
| 17 | ) |
| 18 | |
| 19 | const ( |
| 20 | recordKey = "record" |
| 21 | exprKey = "expr" |
| 22 | labelsKey = "labels" |
| 23 | alertKey = "alert" |
| 24 | forKey = "for" |
| 25 | keepFiringForKey = "keep_firing_for" |
| 26 | annotationsKey = "annotations" |
| 27 | ) |
| 28 | |
| 29 | var ErrRuleCommentOnFile = errors.New("this comment is only valid when attached to a rule") |
| 30 | |
| 31 | type Schema int |
| 32 | |
| 33 | const ( |
| 34 | PrometheusSchema Schema = iota |
| 35 | ThanosSchema |
| 36 | ) |
| 37 | |
| 38 | func NewParser(isStrict bool, schema Schema) Parser { |
| 39 | return Parser{ |
| 40 | isStrict: isStrict, |
| 41 | schema: schema, |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | type Parser struct { |
| 46 | schema Schema |
| 47 | isStrict bool |
| 48 | } |
| 49 | |
| 50 | func (p Parser) Parse(content []byte) (rules []Rule, err error) { |
| 51 | if len(content) == 0 { |
| 52 | return nil, nil |
| 53 | } |
| 54 | |
| 55 | defer func() { |
| 56 | if r := recover(); r != nil { |
| 57 | err = ParseError{Err: fmt.Errorf("unable to parse YAML file: %s", r)} |
| 58 | } |
| 59 | }() |
| 60 | |
| 61 | dec := yaml.NewDecoder(bytes.NewReader(content)) |
| 62 | var index int |
| 63 | for { |
| 64 | var doc yaml.Node |
| 65 | decodeErr := dec.Decode(&doc) |
| 66 | if errors.Is(decodeErr, io.EOF) { |
| 67 | break |
| 68 | } |
| 69 | if decodeErr != nil { |
| 70 | return nil, tryDecodingYamlError(decodeErr) |
| 71 | } |
| 72 | index++ |
| 73 | if p.isStrict { |
| 74 | r, err := parseGroups(content, &doc, p.schema) |
| 75 | if err.Err != nil { |
| 76 | return rules, err |
| 77 | } |
| 78 | rules = append(rules, r...) |
| 79 | } else { |
| 80 | rules = append(rules, parseNode(content, &doc, 0, p.schema)...) |
| 81 | } |
| 82 | if index > 1 && p.isStrict { |
| 83 | rules = append(rules, Rule{ |
| 84 | Lines: LineRange{First: doc.Line, Last: doc.Line}, |
| 85 | Error: ParseError{ |
| 86 | Err: errors.New("multi-document YAML files are not allowed"), |
| 87 | Details: `This is a multi-document YAML file. Prometheus will only parse the first document and silently ignore the rest. |
| 88 | To allow for multi-document YAML files set parser->relaxed option in pint config file.`, |
| 89 | Line: doc.Line, |
| 90 | }, |
| 91 | }) |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | return rules, err |
| 96 | } |
| 97 | |
| 98 | func parseNode(content []byte, node *yaml.Node, offset int, schema Schema) (rules []Rule) { |
| 99 | ret, isEmpty := parseRule(content, node, offset) |
| 100 | if !isEmpty { |
| 101 | rules = append(rules, ret) |
| 102 | return rules |
| 103 | } |
| 104 | |
| 105 | var rule Rule |
| 106 | for _, root := range node.Content { |
| 107 | // nolint: exhaustive |
| 108 | switch root.Kind { |
| 109 | case yaml.SequenceNode: |
| 110 | for _, n := range root.Content { |
| 111 | rules = append(rules, parseNode(content, n, offset, schema)...) |
| 112 | } |
| 113 | case yaml.MappingNode: |
| 114 | rule, isEmpty = parseRule(content, root, offset) |
| 115 | if !isEmpty { |
| 116 | rules = append(rules, rule) |
| 117 | } else { |
| 118 | for _, n := range root.Content { |
| 119 | rules = append(rules, parseNode(content, n, offset, schema)...) |
| 120 | } |
| 121 | } |
| 122 | case yaml.ScalarNode: |
| 123 | if root.Value != string(content) { |
| 124 | c := []byte(root.Value) |
| 125 | var n yaml.Node |
| 126 | if err := yaml.Unmarshal(c, &n); err == nil { |
| 127 | rules = append(rules, parseNode(c, &n, offset+root.Line, schema)...) |
| 128 | } |
| 129 | } |
| 130 | } |
| 131 | } |
| 132 | return rules |
| 133 | } |
| 134 | |
| 135 | func parseRule(content []byte, node *yaml.Node, offset int) (rule Rule, _ bool) { |
| 136 | if node.Kind != yaml.MappingNode { |
| 137 | return rule, true |
| 138 | } |
| 139 | |
| 140 | var recordPart *YamlNode |
| 141 | var exprPart *PromQLExpr |
| 142 | var labelsPart *YamlMap |
| 143 | |
| 144 | var alertPart *YamlNode |
| 145 | var forPart *YamlNode |
| 146 | var keepFiringForPart *YamlNode |
| 147 | var annotationsPart *YamlMap |
| 148 | |
| 149 | var recordNode *yaml.Node |
| 150 | var alertNode *yaml.Node |
| 151 | var exprNode *yaml.Node |
| 152 | var forNode *yaml.Node |
| 153 | var keepFiringForNode *yaml.Node |
| 154 | var labelsNode *yaml.Node |
| 155 | var annotationsNode *yaml.Node |
| 156 | |
| 157 | labelsNodes := []yamlMap{} |
| 158 | annotationsNodes := []yamlMap{} |
| 159 | |
| 160 | var key *yaml.Node |
| 161 | unknownKeys := []*yaml.Node{} |
| 162 | |
| 163 | var lines LineRange |
| 164 | |
| 165 | var ruleComments []comments.Comment |
| 166 | |
| 167 | for i, part := range unpackNodes(node) { |
| 168 | if lines.First == 0 || part.Line+offset < lines.First { |
| 169 | lines.First = part.Line + offset |
| 170 | } |
| 171 | lines.Last = max(lines.Last, part.Line+offset) |
| 172 | |
| 173 | if i == 0 && node.HeadComment != "" && part.HeadComment == "" { |
| 174 | part.HeadComment = node.HeadComment |
| 175 | } |
| 176 | if i == 0 && node.LineComment != "" && part.LineComment == "" { |
| 177 | part.LineComment = node.LineComment |
| 178 | } |
| 179 | if i == len(node.Content)-1 && node.FootComment != "" && part.HeadComment == "" { |
| 180 | part.FootComment = node.FootComment |
| 181 | } |
| 182 | for _, s := range mergeComments(part) { |
| 183 | for _, c := range comments.Parse(part.Line, s) { |
| 184 | if comments.IsRuleComment(c.Type) { |
| 185 | ruleComments = append(ruleComments, c) |
| 186 | } |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | if i%2 == 0 { |
| 191 | key = part |
| 192 | } else { |
| 193 | switch key.Value { |
| 194 | case recordKey: |
| 195 | if recordPart != nil { |
| 196 | return duplicatedKeyError(lines, part.Line+offset, recordKey) |
| 197 | } |
| 198 | recordNode = part |
| 199 | recordPart = newYamlNodeWithKey(key, part, offset) |
| 200 | lines.Last = max(lines.Last, recordPart.Lines.Last) |
| 201 | case alertKey: |
| 202 | if alertPart != nil { |
| 203 | return duplicatedKeyError(lines, part.Line+offset, alertKey) |
| 204 | } |
| 205 | alertNode = part |
| 206 | alertPart = newYamlNodeWithKey(key, part, offset) |
| 207 | lines.Last = max(lines.Last, alertPart.Lines.Last) |
| 208 | case exprKey: |
| 209 | if exprPart != nil { |
| 210 | return duplicatedKeyError(lines, part.Line+offset, exprKey) |
| 211 | } |
| 212 | exprNode = part |
| 213 | exprPart = newPromQLExpr(key, part, offset) |
| 214 | lines.Last = max(lines.Last, exprPart.Value.Lines.Last) |
| 215 | case forKey: |
| 216 | if forPart != nil { |
| 217 | return duplicatedKeyError(lines, part.Line+offset, forKey) |
| 218 | } |
| 219 | forNode = part |
| 220 | forPart = newYamlNodeWithKey(key, part, offset) |
| 221 | lines.Last = max(lines.Last, forPart.Lines.Last) |
| 222 | case keepFiringForKey: |
| 223 | if keepFiringForPart != nil { |
| 224 | return duplicatedKeyError(lines, part.Line+offset, keepFiringForKey) |
| 225 | } |
| 226 | keepFiringForNode = part |
| 227 | keepFiringForPart = newYamlNodeWithKey(key, part, offset) |
| 228 | lines.Last = max(lines.Last, keepFiringForPart.Lines.Last) |
| 229 | case labelsKey: |
| 230 | if labelsPart != nil { |
| 231 | return duplicatedKeyError(lines, part.Line+offset, labelsKey) |
| 232 | } |
| 233 | labelsNode = part |
| 234 | labelsNodes = mappingNodes(part) |
| 235 | labelsPart = newYamlMap(key, part, offset) |
| 236 | lines.Last = max(lines.Last, labelsPart.Lines.Last) |
| 237 | case annotationsKey: |
| 238 | if annotationsPart != nil { |
| 239 | return duplicatedKeyError(lines, part.Line+offset, annotationsKey) |
| 240 | } |
| 241 | annotationsNode = part |
| 242 | annotationsNodes = mappingNodes(part) |
| 243 | annotationsPart = newYamlMap(key, part, offset) |
| 244 | lines.Last = max(lines.Last, annotationsPart.Lines.Last) |
| 245 | default: |
| 246 | unknownKeys = append(unknownKeys, key) |
| 247 | } |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | if exprPart != nil && exprPart.Value.Lines.First != exprPart.Value.Lines.Last { |
| 252 | contentLines := strings.Split(string(content), "\n") |
| 253 | for { |
| 254 | start := exprPart.Value.Lines.First |
| 255 | end := exprPart.Value.Lines.Last |
| 256 | if end > len(contentLines) { |
| 257 | end-- |
| 258 | } |
| 259 | input := strings.Join(contentLines[start:end], "") |
| 260 | input = strings.ReplaceAll(input, " ", "") |
| 261 | output := strings.ReplaceAll(exprPart.Value.Value, "\n", "") |
| 262 | output = strings.ReplaceAll(output, " ", "") |
| 263 | if end >= len(contentLines) { |
| 264 | break |
| 265 | } |
| 266 | if input == output { |
| 267 | break |
| 268 | } |
| 269 | exprPart.Value.Lines.Last = end + 1 |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | if recordPart != nil && alertPart != nil { |
| 274 | rule = Rule{ |
| 275 | Lines: lines, |
| 276 | Error: ParseError{ |
| 277 | Line: node.Line + offset, |
| 278 | Err: fmt.Errorf("got both %s and %s keys in a single rule", recordKey, alertKey), |
| 279 | }, |
| 280 | } |
| 281 | return rule, false |
| 282 | } |
| 283 | if exprPart != nil && alertPart == nil && recordPart == nil { |
| 284 | rule = Rule{ |
| 285 | Lines: lines, |
| 286 | Error: ParseError{ |
| 287 | Line: exprPart.Value.Lines.Last, |
| 288 | Err: fmt.Errorf("incomplete rule, no %s or %s key", alertKey, recordKey), |
| 289 | }, |
| 290 | } |
| 291 | return rule, false |
| 292 | } |
| 293 | if recordPart != nil && forPart != nil { |
| 294 | rule = Rule{ |
| 295 | Lines: lines, |
| 296 | Error: ParseError{ |
| 297 | Line: forPart.Lines.First, |
| 298 | Err: fmt.Errorf("invalid field '%s' in recording rule", forKey), |
| 299 | }, |
| 300 | } |
| 301 | return rule, false |
| 302 | } |
| 303 | if recordPart != nil && keepFiringForPart != nil { |
| 304 | rule = Rule{ |
| 305 | Lines: lines, |
| 306 | Error: ParseError{ |
| 307 | Line: keepFiringForPart.Lines.First, |
| 308 | Err: fmt.Errorf("invalid field '%s' in recording rule", keepFiringForKey), |
| 309 | }, |
| 310 | } |
| 311 | return rule, false |
| 312 | } |
| 313 | if recordPart != nil && annotationsPart != nil { |
| 314 | rule = Rule{ |
| 315 | Lines: lines, |
| 316 | Error: ParseError{ |
| 317 | Line: annotationsPart.Lines.First, |
| 318 | Err: fmt.Errorf("invalid field '%s' in recording rule", annotationsKey), |
| 319 | }, |
| 320 | } |
| 321 | return rule, false |
| 322 | } |
| 323 | for _, entry := range []struct { |
| 324 | part *yaml.Node |
| 325 | key string |
| 326 | }{ |
| 327 | {key: recordKey, part: recordNode}, |
| 328 | {key: alertKey, part: alertNode}, |
| 329 | {key: exprKey, part: exprNode}, |
| 330 | {key: forKey, part: forNode}, |
| 331 | {key: keepFiringForKey, part: keepFiringForNode}, |
| 332 | } { |
| 333 | if entry.part != nil && !isTag(entry.part.ShortTag(), strTag) { |
| 334 | return invalidValueError(lines, entry.part.Line+offset, entry.key, describeTag(strTag), describeTag(entry.part.ShortTag())) |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | for _, entry := range []struct { |
| 339 | part *yaml.Node |
| 340 | key string |
| 341 | }{ |
| 342 | {key: labelsKey, part: labelsNode}, |
| 343 | {key: annotationsKey, part: annotationsNode}, |
| 344 | } { |
| 345 | if entry.part != nil && !isTag(entry.part.ShortTag(), mapTag) { |
| 346 | return invalidValueError(lines, entry.part.Line+offset, entry.key, describeTag(mapTag), describeTag(entry.part.ShortTag())) |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | for _, elem := range []struct { |
| 351 | key string |
| 352 | parts []yamlMap |
| 353 | }{ |
| 354 | {key: labelsKey, parts: labelsNodes}, |
| 355 | {key: annotationsKey, parts: annotationsNodes}, |
| 356 | } { |
| 357 | names := map[string]struct{}{} |
| 358 | for _, entry := range elem.parts { |
| 359 | if !isTag(entry.val.ShortTag(), strTag) { |
| 360 | return invalidValueError(lines, entry.val.Line+offset, fmt.Sprintf("%s %s", elem.key, nodeValue(entry.key)), describeTag(strTag), describeTag(entry.val.ShortTag())) |
| 361 | } |
| 362 | if _, ok := names[entry.key.Value]; ok { |
| 363 | return Rule{ |
| 364 | Lines: rangeFromYamlMaps(elem.parts), |
| 365 | Error: ParseError{ |
| 366 | Line: entry.key.Line, |
| 367 | Err: fmt.Errorf("duplicated %s key %s", elem.key, entry.key.Value), |
| 368 | }, |
| 369 | }, false |
| 370 | } |
| 371 | names[entry.key.Value] = struct{}{} |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | if r, ok := ensureRequiredKeys(lines, recordKey, recordPart, exprPart); !ok { |
| 376 | return r, false |
| 377 | } |
| 378 | if r, ok := ensureRequiredKeys(lines, alertKey, alertPart, exprPart); !ok { |
| 379 | return r, false |
| 380 | } |
| 381 | if (recordPart != nil || alertPart != nil) && len(unknownKeys) > 0 { |
| 382 | var keys []string |
| 383 | for _, n := range unknownKeys { |
| 384 | keys = append(keys, n.Value) |
| 385 | } |
| 386 | rule = Rule{ |
| 387 | Lines: lines, |
| 388 | Error: ParseError{ |
| 389 | Line: unknownKeys[0].Line + offset, |
| 390 | Err: fmt.Errorf("invalid key(s) found: %s", strings.Join(keys, ", ")), |
| 391 | }, |
| 392 | } |
| 393 | return rule, false |
| 394 | } |
| 395 | |
| 396 | if recordPart != nil && !model.IsValidMetricName(model.LabelValue(recordPart.Value)) { |
| 397 | return Rule{ |
| 398 | Lines: lines, |
| 399 | Error: ParseError{ |
| 400 | Line: recordPart.Lines.First, |
| 401 | Err: fmt.Errorf("invalid recording rule name: %s", recordPart.Value), |
| 402 | }, |
| 403 | }, false |
| 404 | } |
| 405 | |
| 406 | if (recordPart != nil || alertPart != nil) && labelsPart != nil { |
| 407 | for _, lab := range labelsPart.Items { |
| 408 | if !model.LabelName(lab.Key.Value).IsValid() || lab.Key.Value == model.MetricNameLabel { |
| 409 | return Rule{ |
| 410 | Lines: lines, |
| 411 | Error: ParseError{ |
| 412 | Line: lab.Key.Lines.First, |
| 413 | Err: fmt.Errorf("invalid label name: %s", lab.Key.Value), |
| 414 | }, |
| 415 | }, false |
| 416 | } |
| 417 | if !model.LabelValue(lab.Value.Value).IsValid() { |
| 418 | return Rule{ |
| 419 | Lines: lines, |
| 420 | Error: ParseError{ |
| 421 | Line: lab.Key.Lines.First, |
| 422 | Err: fmt.Errorf("invalid label value: %s", lab.Value.Value), |
| 423 | }, |
| 424 | }, false |
| 425 | } |
| 426 | } |
| 427 | } |
| 428 | |
| 429 | if alertPart != nil && annotationsPart != nil { |
| 430 | for _, ann := range annotationsPart.Items { |
| 431 | if !model.LabelName(ann.Key.Value).IsValid() { |
| 432 | return Rule{ |
| 433 | Lines: lines, |
| 434 | Error: ParseError{ |
| 435 | Line: ann.Key.Lines.First, |
| 436 | Err: fmt.Errorf("invalid annotation name: %s", ann.Key.Value), |
| 437 | }, |
| 438 | }, false |
| 439 | } |
| 440 | } |
| 441 | } |
| 442 | |
| 443 | if recordPart != nil && exprPart != nil { |
| 444 | rule = Rule{ |
| 445 | Lines: lines, |
| 446 | RecordingRule: &RecordingRule{ |
| 447 | Record: *recordPart, |
| 448 | Expr: *exprPart, |
| 449 | Labels: labelsPart, |
| 450 | }, |
| 451 | Comments: ruleComments, |
| 452 | } |
| 453 | return rule, false |
| 454 | } |
| 455 | |
| 456 | if alertPart != nil && exprPart != nil { |
| 457 | rule = Rule{ |
| 458 | Lines: lines, |
| 459 | AlertingRule: &AlertingRule{ |
| 460 | Alert: *alertPart, |
| 461 | Expr: *exprPart, |
| 462 | For: forPart, |
| 463 | KeepFiringFor: keepFiringForPart, |
| 464 | Labels: labelsPart, |
| 465 | Annotations: annotationsPart, |
| 466 | }, |
| 467 | Comments: ruleComments, |
| 468 | } |
| 469 | return rule, false |
| 470 | } |
| 471 | |
| 472 | return rule, true |
| 473 | } |
| 474 | |
| 475 | func unpackNodes(node *yaml.Node) []*yaml.Node { |
| 476 | nodes := make([]*yaml.Node, 0, len(node.Content)) |
| 477 | var isMerge bool |
| 478 | for _, part := range node.Content { |
| 479 | if part.ShortTag() == mergeTag && part.Value == "<<" { |
| 480 | isMerge = true |
| 481 | } |
| 482 | |
| 483 | if part.Alias != nil { |
| 484 | if isMerge { |
| 485 | nodes = append(nodes, resolveMapAlias(part, node).Content...) |
| 486 | } else { |
| 487 | nodes = append(nodes, resolveMapAlias(part, part)) |
| 488 | } |
| 489 | isMerge = false |
| 490 | continue |
| 491 | } |
| 492 | if isMerge { |
| 493 | continue |
| 494 | } |
| 495 | nodes = append(nodes, part) |
| 496 | } |
| 497 | return nodes |
| 498 | } |
| 499 | |
| 500 | func nodeKeys(node *yaml.Node) (keys []string) { |
| 501 | if node.Kind != yaml.MappingNode { |
| 502 | return keys |
| 503 | } |
| 504 | for i, n := range node.Content { |
| 505 | if i%2 == 0 && n.Value != "" { |
| 506 | keys = append(keys, n.Value) |
| 507 | } |
| 508 | } |
| 509 | return keys |
| 510 | } |
| 511 | |
| 512 | func hasKey(node *yaml.Node, key string) bool { |
| 513 | for _, k := range nodeKeys(node) { |
| 514 | if k == key { |
| 515 | return true |
| 516 | } |
| 517 | } |
| 518 | return false |
| 519 | } |
| 520 | |
| 521 | func hasValue(node *YamlNode) bool { |
| 522 | if node == nil { |
| 523 | return false |
| 524 | } |
| 525 | return node.Value != "" |
| 526 | } |
| 527 | |
| 528 | func ensureRequiredKeys(lines LineRange, key string, keyVal *YamlNode, expr *PromQLExpr) (Rule, bool) { |
| 529 | if keyVal == nil { |
| 530 | return Rule{Lines: lines}, true |
| 531 | } |
| 532 | if !hasValue(keyVal) { |
| 533 | return Rule{ |
| 534 | Lines: lines, |
| 535 | Error: ParseError{ |
| 536 | Line: keyVal.Lines.Last, |
| 537 | Err: fmt.Errorf("%s value cannot be empty", key), |
| 538 | }, |
| 539 | }, false |
| 540 | } |
| 541 | if expr == nil { |
| 542 | return Rule{ |
| 543 | Lines: lines, |
| 544 | Error: ParseError{ |
| 545 | Line: keyVal.Lines.Last, |
| 546 | Err: fmt.Errorf("missing %s key", exprKey), |
| 547 | }, |
| 548 | }, false |
| 549 | } |
| 550 | if !hasValue(expr.Value) { |
| 551 | return Rule{ |
| 552 | Lines: lines, |
| 553 | Error: ParseError{ |
| 554 | Line: expr.Value.Lines.Last, |
| 555 | Err: fmt.Errorf("%s value cannot be empty", exprKey), |
| 556 | }, |
| 557 | }, false |
| 558 | } |
| 559 | return Rule{Lines: lines}, true |
| 560 | } |
| 561 | |
| 562 | func resolveMapAlias(part, parent *yaml.Node) *yaml.Node { |
| 563 | node := *part |
| 564 | node.Content = nil |
| 565 | var ok bool |
| 566 | for i, alias := range part.Alias.Content { |
| 567 | if i%2 == 0 { |
| 568 | ok = !hasKey(parent, alias.Value) |
| 569 | } |
| 570 | if ok { |
| 571 | node.Content = append(node.Content, alias) |
| 572 | } |
| 573 | if i%2 == 1 { |
| 574 | ok = false |
| 575 | } |
| 576 | } |
| 577 | return &node |
| 578 | } |
| 579 | |
| 580 | func duplicatedKeyError(lines LineRange, line int, key string) (Rule, bool) { |
| 581 | rule := Rule{ |
| 582 | Lines: lines, |
| 583 | Error: ParseError{ |
| 584 | Line: line, |
| 585 | Err: fmt.Errorf("duplicated %s key", key), |
| 586 | }, |
| 587 | } |
| 588 | return rule, false |
| 589 | } |
| 590 | |
| 591 | func invalidValueError(lines LineRange, line int, key, expectedTag, gotTag string) (Rule, bool) { |
| 592 | rule := Rule{ |
| 593 | Lines: lines, |
| 594 | Error: ParseError{ |
| 595 | Line: line, |
| 596 | Err: fmt.Errorf("%s value must be a %s, got %s instead", key, expectedTag, gotTag), |
| 597 | }, |
| 598 | } |
| 599 | return rule, false |
| 600 | } |
| 601 | |
| 602 | func isTag(tag, expected string) bool { |
| 603 | if tag == nullTag { |
| 604 | return true |
| 605 | } |
| 606 | return tag == expected |
| 607 | } |
| 608 | |
| 609 | type yamlMap struct { |
| 610 | key *yaml.Node |
| 611 | val *yaml.Node |
| 612 | } |
| 613 | |
| 614 | func mappingNodes(node *yaml.Node) []yamlMap { |
| 615 | m := make([]yamlMap, 0, len(node.Content)/2) |
| 616 | var key *yaml.Node |
| 617 | for _, child := range node.Content { |
| 618 | if key != nil { |
| 619 | m = append(m, yamlMap{key: key, val: child}) |
| 620 | key = nil |
| 621 | } else { |
| 622 | key = child |
| 623 | } |
| 624 | } |
| 625 | return m |
| 626 | } |
| 627 | |
| 628 | func rangeFromYamlMaps(m []yamlMap) (lr LineRange) { |
| 629 | for _, entry := range m { |
| 630 | if lr.First == 0 { |
| 631 | lr.First = entry.key.Line |
| 632 | lr.Last = entry.val.Line |
| 633 | } |
| 634 | lr.First = min(lr.First, entry.key.Line, entry.val.Line) |
| 635 | lr.Last = max(lr.Last, entry.key.Line, entry.val.Line) |
| 636 | } |
| 637 | return lr |
| 638 | } |
| 639 | |
| 640 | var ( |
| 641 | yamlErrRe = regexp.MustCompile("^yaml: line (.+): (.+)") |
| 642 | yamlUnmarshalErrRe = regexp.MustCompile("^yaml: unmarshal errors:\n line (.+): (.+)") |
| 643 | ) |
| 644 | |
| 645 | func tryDecodingYamlError(err error) ParseError { |
| 646 | for _, re := range []*regexp.Regexp{yamlErrRe, yamlUnmarshalErrRe} { |
| 647 | parts := re.FindStringSubmatch(err.Error()) |
| 648 | if len(parts) > 2 { |
| 649 | if line, err2 := strconv.Atoi(parts[1]); line > 0 && err2 == nil { |
| 650 | return ParseError{ |
| 651 | Line: line, |
| 652 | Err: errors.New(parts[2]), |
| 653 | } |
| 654 | } |
| 655 | } |
| 656 | } |
| 657 | return ParseError{Line: 1, Err: err} |
| 658 | } |
| 659 | |