Module flexible_parser 

Flexible JSON parser — extracts structured data from messy LLM output.

Inspired by BAML’s “jsonish” SAP (Schema-Aligned Parsing) approach. Collects multiple parse candidates (AnyOf), tries to deserialize each into the target type T, returns the first success.

Parse cascade:

1. Direct JSON (serde_json::from_str)
2. Markdown code blocks (json ... )
3. Greedy JSON extraction (first {...} or [...] in text)
4. Fixing parser (close brackets, strip trailing commas, unquoted keys)
5. Fail with all candidates listed

Works with any model — no structured output API required.

Structs

Candidate

A parse candidate with provenance info for debugging.

ParseError

Parse error with all attempted candidates.

ParseResult

Result of a flexible parse attempt.

Enums

CandidateSource

Functions

collect_candidates

Collect all parse candidates from raw text (AnyOf pattern).

parse_flexible

Parse raw LLM output into type T using the AnyOf cascade.

parse_flexible_coerced

Parse with schema-aware coercion: “42” → 42, “true” → true, “redd” → “Red”.