Module yaml 

YAML parser groundwork for long-term Panache integration.

This module is intentionally minimal and currently acts as a placeholder for a future in-tree YAML parser that can produce Panache-compatible CST structures. Initial goals:

• support plain YAML and hashpipe-prefixed YAML from shared parsing primitives,
• preserve lossless syntax/trivia needed for exact host document ranges,
• enable shadow-mode comparison against the existing YAML engine before rollout.
• prepare for first-class YAML formatting support once parser parity is proven.

Modules

diagnostic_codes

Structs

ShadowParserV2Report

Public byte-completeness report from running the v2 parser scaffold over an input. The harness in tests/yaml.rs uses this to gate each step-11 sub-commit on losslessness.

ShadowScannerReport

Byte-completeness report from running the streaming scanner over an input. Used by the integration harness to gate the cutover (step 12) — until every allowlisted fixture is covered byte-completely with no overlaps or gaps, the new scanner cannot replace the line-based lexer.

ShadowYamlOptions

ShadowYamlReport

YamlDiagnostic

YamlParseReport

Enums

ShadowYamlOutcome

YamlInputKind

Functions

parse_shadow

Parse YAML in shadow mode using prototype groundwork only.

parse_v2

Drive the scanner over input and build a CST. Always returns a SyntaxNode — the scanner is permissive and the v2 builder preserves bytes regardless of well-formedness.

parse_yaml_report

Parse prototype YAML tree structure and include diagnostics on failure.

parse_yaml_tree

Parse prototype YAML tree structure from input

project_events

Walk the shadow CST for input and return the projected yaml-test-suite event stream. Returns an empty vector if the input fails to parse.

project_events_from_tree

Walk a shadow-parser CST and return the projected yaml-test-suite event stream. Decoupled from parse_yaml_tree so the v2 parser can reuse the same projection for parity comparisons.

shadow_parser_v2_check

Run the v2 parser and return a losslessness report. Exposed so the integration harness can run over allowlisted fixtures without depending on private types.

shadow_scanner_check

Drive the streaming scanner to completion over input and return a byte-completeness report. This is exposed so the integration harness in tests/yaml.rs can run the scanner over every allowlisted fixture without depending on internal Token/Scanner types.