Reject unterminated configuration strings with one useful diagnostic
A missing quote produces dozens of bogus tokens. Add a bounded string error and recovery boundary.
- Focused work estimate
- 1h 15m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Lexing · Diagnostics
Estimated field mix
- Compiler and language tooling100%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
Fictional build tool Sprig reads a tiny configuration language with identifiers, strings, lists and assignments. Author the grammar and synthetic source corpus locally; parsing never executes source.
Setup prerequisites
- Write the tiny language grammar and generated source examples.
- Create fixtures with Unicode, truncated tokens and nested lists.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Diagnostic identifies opening quote
- Lexer makes forward progress
- Later valid line can tokenize
Implementation constraints
- Do not guess a closing quote silently.
Verification to include
- Tokenize valid escaped string
- Tokenize missing final quote
Deliverables
- String lexer and error cases
Rollout and recovery
Stop at first string error if recovery becomes ambiguous.
Value of the work
For the engineer: Practice source positions, grammar boundaries and error recovery.
For the team: Inspect whether tooling errors help users correct configuration safely.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.