{"record":{"id":"702ae426c29b0f66","repo":"helix-editor/helix","slug":"failed-to-parse-snippet-remaining-input","errorCode":null,"errorMessage":"Failed to parse snippet. Remaining input: {}","messagePattern":"Failed to parse snippet\\. Remaining input: (.+?)","errorType":"exception","errorClass":"anyhow::Error","httpStatus":null,"severity":"error","filePath":"helix-core/src/snippets/elaborate.rs","lineNumber":29,"sourceCode":"use ropey::RopeSlice;\n\nuse crate::case_conversion::to_lower_case_with;\nuse crate::case_conversion::to_upper_case_with;\nuse crate::case_conversion::{to_camel_case_with, to_pascal_case_with};\nuse crate::snippets::parser::{self, CaseChange, FormatItem};\nuse crate::snippets::{TabstopIdx, LAST_TABSTOP_IDX};\nuse crate::Tendril;\n\n#[derive(Debug)]\npub struct Snippet {\n    elements: Vec<SnippetElement>,\n    tabstops: Vec<Tabstop>,\n}\n\nimpl Snippet {\n    pub fn parse(snippet: &str) -> Result<Self> {\n        let parsed_snippet = parser::parse(snippet)\n            .map_err(|rest| anyhow!(\"Failed to parse snippet. Remaining input: {}\", rest))?;\n        Ok(Snippet::new(parsed_snippet))\n    }\n\n    pub fn new(elements: Vec<parser::SnippetElement>) -> Snippet {\n        let mut res = Snippet {\n            elements: Vec::new(),\n            tabstops: Vec::new(),\n        };\n        res.elements = res.elaborate(elements, None).into();\n        res.fixup_tabstops();\n        res.ensure_last_tabstop();\n        res.renumber_tabstops();\n        res\n    }\n\n    pub fn elements(&self) -> &[SnippetElement] {\n        &self.elements\n    }","sourceCodeStart":11,"sourceCodeEnd":47,"githubUrl":"https://github.com/helix-editor/helix/blob/079a789e8cb08ead67f19e1971a1b7438b37354b/helix-core/src/snippets/elaborate.rs#L11-L47","documentation":"Thrown by Snippet::parse when the internal LSP/VSCode-style snippet parser (helix-core/src/snippets/parser.rs:77) cannot consume the entire input string; the error carries the unconsumed remainder. This means the snippet text contains a construct the grammar does not accept (empty string, stray '$', unterminated placeholder '${1' or '${name', or an unescaped '}'/'\\' outside a valid escape). Any caller applying a snippet (LSP completion/insert-text, user snippet recipes) surfaces this error instead of inserting text.","triggerScenarios":"Calling Snippet::parse with an empty string (the parser test at parser.rs:349 asserts parse(\"\") == Err(\"\")), a '$' not followed by a digit, '{', or variable name, an unterminated '${...' placeholder, or a '$' escape used where the grammar expects valid tabstop/variable syntax. Reached from LSP completion items whose insertTextFormat is Snippet but whose insertText is malformed, or from user-defined snippets in config.","commonSituations":"A language server sends a broken or non-standard snippet body; a user writes a snippet recipe with a literal '$' or '}' that is not escaped ('\\$', '\\}'); an empty snippet string is passed when a completion item has no text; version changes in the snippet grammar reject a construct an older release tolerated.","solutions":["Inspect the 'Remaining input' portion — the first character of it is exactly where parsing stopped; fix or escape it (use \\$ and \\} for literals)","If the snippet comes from your own config/recipe, validate the body against VSCode snippet syntax: tabstops $1/$0, placeholders ${1:text}, variables ${name}, choice ${1|a,b|}, escaped \\$ \\} \\\\","If it comes from an LSP server, capture the exact insertText sent (set log file via 'hx --log' and LSP logging) and report/patch the server; as a workaround send plain-text completions","Empty snippet strings are invalid — fall back to an empty insert or reject the completion item before calling Snippet::parse"],"exampleFix":"// before\nlet snippet = Snippet::parse(\"cost: $100 }\")?; // stray '$' and '}' stop the parser\n\n// after\nlet snippet = Snippet::parse(\"cost: \\$100 \\}\")?; // literals escaped, parses fully","handlingStrategy":"validation","validationCode":"// Rust: dry-run the parse before applying a snippet (insert/edit path)\nuse helix_core::snippets::Snippet;\n\nfn safe_snippet(body: &str) -> Option<Snippet> {\n    match Snippet::parse(body) {\n        Ok(s) => Some(s),\n        Err(err) => {\n            log::warn!(\"rejecting malformed snippet {body:?}: {err}\");\n            None // fall back to inserting raw text\n        }\n    }\n}","typeGuard":"fn is_parseable_snippet(body: &str) -> bool {\n    helix_core::snippets::Snippet::parse(body).is_ok()\n}","tryCatchPattern":"// Snippet::parse returns Result<Snippet, anyhow::Error>; always handle it,\n// never unwrap on text that originated from LSP or user config:\nmatch Snippet::parse(text) {\n    Ok(snippet) => apply(snippet),\n    Err(e) => editor.set_error(format!(\"invalid snippet: {e}\")),\n}","preventionTips":["Escape literal '$', '}' and '\\\\' as '\\$', '\\}', '\\\\\\' in snippet bodies","Never pass an empty string - short-circuit empty completions to plain insert","If you ship snippets, add a unit test that runs Snippet::parse on every body","Log the offending snippet body together with the 'Remaining input' when it fails"],"tags":["rust","helix","snippet","lsp","parser"],"backgroundTag":null,"analyzedSha":"079a789e8cb08ead67f19e1971a1b7438b37354b","analyzedAt":"2026-08-16T09:09:59.668Z","schemaVersion":2},"datasetVersion":"2026-08-16T13:17:31.715Z"}