{"record":{"id":"af1d52986fe0903d","repo":"plandex-ai/plandex","slug":"failed-to-parse-the-content-with-fallback-parser","errorCode":null,"errorMessage":"failed to parse the content with fallback parser: %v","messagePattern":"failed to parse the content with fallback parser: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"app/server/syntax/validate.go","lineNumber":68,"sourceCode":"\t\t}\n\n\t\treturn nil, fmt.Errorf(\"failed to parse the content: %v\", err)\n\t}\n\tdefer tree.Close()\n\n\t// Get the root node of the syntax tree and check for errors\n\troot := tree.RootNode()\n\n\tif root.HasError() {\n\t\tif fallbackParser != nil {\n\t\t\tfallbackTree, err := fallbackParser.ParseCtx(ctx, nil, []byte(file))\n\t\t\tif err != nil || fallbackTree == nil {\n\n\t\t\t\tif err != nil && strings.Contains(err.Error(), \"timeout\") {\n\t\t\t\t\treturn &ValidationRes{Lang: lang, Parser: parser, TimedOut: true}, nil\n\t\t\t\t}\n\n\t\t\t\treturn nil, fmt.Errorf(\"failed to parse the content with fallback parser: %v\", err)\n\t\t\t}\n\t\t\tdefer fallbackTree.Close()\n\n\t\t\troot = fallbackTree.RootNode()\n\n\t\t\tif !root.HasError() {\n\t\t\t\treturn &ValidationRes{Lang: fallbackLang, Parser: fallbackParser, Valid: true}, nil\n\t\t\t}\n\t\t}\n\n\t\terrorMarkers := insertErrorMarkers(file, root)\n\n\t\treturn &ValidationRes{\n\t\t\tLang:   lang,\n\t\t\tParser: parser,\n\t\t\tValid:  false,\n\t\t\tErrors: errorMarkers,\n\t\t}, nil","sourceCodeStart":50,"sourceCodeEnd":86,"githubUrl":"https://github.com/plandex-ai/plandex/blob/e2d772072efadbe41d2946d97d79be55532dbab5/app/server/syntax/validate.go#L50-L86","documentation":"When the primary parse produces a tree with errors, ValidateWithParsers retries with a fallback parser. If the fallback ParseCtx also fails or returns a nil tree — excluding timeout-like errors, which are reported as TimedOut — it returns 'failed to parse the content with fallback parser: %v'. This means neither the primary nor the fallback grammar could parse the content.","triggerScenarios":"Primary parse yields a tree whose root HasError, the fallback parser is attempted, and the fallback parse errors for a non-timeout reason (cancellation, nil tree, internal failure) during ValidateFile/validateSyntax/loadBuildFile.","commonSituations":"Content valid under neither the primary nor fallback grammar; context deadline expiring between the two parses; fallback parser not actually initialized (nil-related failure); content for a language with weak grammar support.","solutions":["Read the wrapped '%v' cause; fix cancellation/deadline issues by enlarging the context","Confirm content is syntactically valid for the target language; fix the source syntax","Skip fallback validation or treat the file as unparseable and exclude it","Update grammars/parsers to a version that supports the language constructs used"],"exampleFix":"// before\nres, err := syntax.ValidateFile(path, content)\n// after\nctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)\ndefer cancel()\nres, err := syntax.ValidateFile(path, content, syntax.WithContext(ctx))","handlingStrategy":"fallback","validationCode":"if ctx == nil || ctx.Err() != nil {\n    return fmt.Errorf(\"context dead before fallback parse\")\n}\nprimaryRes, err := ValidateWithParsers(lang, content, primaryParsers)\nif err == nil && primaryRes != nil && !primaryRes.ParseHasError {\n    return nil // no fallback needed\n}","typeGuard":null,"tryCatchPattern":"res, err := ValidateFile(path, content)\nif err != nil && strings.Contains(err.Error(), \"fallback parser\") {\n    if strings.Contains(err.Error(), \"timeout\") {\n        res = &syntax.ValidationRes{TimedOut: true}\n    } else {\n        log.Printf(\"content unparseable by any grammar: %v\", err)\n    }\n}","preventionTips":["Ensure the fallback parser is properly initialized for the language","Use a deadline large enough to cover both primary and fallback parses","Update grammars when content uses newer language constructs","Treat double-parse failure as 'unparseable content' and skip the file"],"tags":["tree-sitter","validation","fallback-parser","parse-error"],"backgroundTag":"file-parse-failed","analyzedSha":"e2d772072efadbe41d2946d97d79be55532dbab5","analyzedAt":"2026-09-05T20:56:53.631Z","contentChangedAt":"2026-09-05T20:56:53.631Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}