{"record":{"id":"b2dab958b54c4135","repo":"bevyengine/bevy","slug":"encountered-an-error-at-offset-offset-while-pars","errorCode":null,"errorMessage":"Encountered an error at offset {offset} while parsing `{path}`: {error}","messagePattern":"Encountered an error at offset (.+?) while parsing `(.+?)`: (.+?)","errorType":"exception","errorClass":"ReflectPathError","httpStatus":null,"severity":"error","filePath":"crates/bevy_reflect/src/path/mod.rs","lineNumber":33,"sourceCode":"use derive_more::derive::From;\nuse thiserror::Error;\n\ntype PathResult<'a, T> = Result<T, ReflectPathError<'a>>;\n\n/// An error returned from a failed path string query.\n#[derive(Error, Debug, PartialEq, Eq)]\npub enum ReflectPathError<'a> {\n    /// An error caused by trying to access a path that's not able to be accessed,\n    /// see [`AccessError`] for details.\n    #[error(transparent)]\n    InvalidAccess(AccessError<'a>),\n\n    /// An error that occurs when a type cannot downcast to a given type.\n    #[error(\"Can't downcast result of access to the given type\")]\n    InvalidDowncast,\n\n    /// An error caused by an invalid path string that couldn't be parsed.\n    #[error(\"Encountered an error at offset {offset} while parsing `{path}`: {error}\")]\n    ParseError {\n        /// Position in `path`.\n        offset: usize,\n        /// The path that the error occurred in.\n        path: &'a str,\n        /// The underlying error.\n        error: ParseError<'a>,\n    },\n}\n\nimpl<'a> From<AccessError<'a>> for ReflectPathError<'a> {\n    fn from(value: AccessError<'a>) -> Self {\n        ReflectPathError::InvalidAccess(value)\n    }\n}\n\n/// Something that can be interpreted as a reflection path in [`GetPath`].\npub trait ReflectPath<'a>: Sized {","sourceCodeStart":15,"sourceCodeEnd":51,"githubUrl":"https://github.com/bevyengine/bevy/blob/396ca727080776bd313bb892423b7d94e03b81b4/crates/bevy_reflect/src/path/mod.rs#L15-L51","documentation":"ReflectPathError::ParseError wraps a lower-level path-parser failure: it reports the byte offset in the path string, the full path, and the nested ParseError (NoIdent, ExpectedIdent, InvalidIndex, Unclosed, BadClose, CloseBeforeOpen). It is returned whenever a reflect path string like \"a.b[0].c\" violates the grammar (identifiers separated by '.', indices in '[]').","triggerScenarios":"Passing a malformed path string to GetPath::path/reflect_path APIs — unclosed brackets, stray tokens, empty identifiers, or non-integer indices; the offset field points at where parsing stopped.","commonSituations":"Paths assembled from user input, config files, or query DSLs; typos like \"foo[0\" or \"foo..bar\"; JSON-style paths (\"a.b[0]\") vs alternate syntaxes people assume (\"a->b\", \"a/b\") that the parser rejects.","solutions":["Use the reported offset and nested ParseError to fix the exact spot in the path string; valid syntax is ident('.'ident|'['index']')*.","Validate/normalize path strings before use (e.g. Path::parse on a known-good subset) when they come from users or files.","For alternate syntaxes, translate them into reflect-path syntax before querying.","If the path is dynamic, prefer building access programmatically (Struct::field, List::get) instead of string parsing."],"exampleFix":"// before\nlet v = entity.path::<f32>(\"transform..scale\"); // ParseError at offset 10\n\n// after\nlet v = entity.path::<f32>(\"transform.scale\");","handlingStrategy":"try-catch","validationCode":"use bevy_reflect::path::Path;\n\nfn valid_path(s: &str) -> bool {\n    Path::parse(s).is_ok() // reject bad strings before any query\n}","typeGuard":null,"tryCatchPattern":"match entity.reflect_path(user_path) {\n    Ok(el) => { /* ... */ }\n    Err(ReflectPathError::ParseError { offset, path, error }) => {\n        warn!(\"bad path '{path}' at offset {offset}: {error}\");\n    }\n    Err(other) => warn!(\"path failed: {other}\"),\n}","preventionTips":["Validate user/config-supplied paths with Path::parse before use.","Fuzz or snapshot-test generated path strings when they are built programmatically.","Remember the grammar: identifiers joined by '.', indices only inside '[]'."],"tags":["rust","bevy","bevy-reflect","reflect-path","parse-error","path-syntax"],"backgroundTag":"invalid-path-syntax","analyzedSha":"396ca727080776bd313bb892423b7d94e03b81b4","analyzedAt":"2026-08-20T16:12:39.808Z","contentChangedAt":"2026-08-20T16:12:39.808Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}