claude_bottle/yaml_subset.py — stdlib-only, ~450 lines. Parses the
bounded shape claude-bottle's manifest files use:
- Block mappings (top-level + nested via indentation)
- Block lists (under a key, items can be scalars or block-style
mappings whose keys align with the rest after the dash)
- Inline lists `[a, b]` and inline dicts `{a: 1}` for one-level
leaves
- Quoted (single + double) and bare strings
- Scalars: string, int, true/false, null/~
Rejects, each with a clear pointer at the line number:
- `yes`/`no`/`on`/`off`/`Y`/`N`/`TRUE`/`FALSE` — only literal
`true` / `false` are bools (the Norway problem stays solved by
"quote your strings if they look like bools")
- Bare strings that look like dates / octals / hex / floats
- Anchors (`&`/`*`), aliases, YAML tags (`!!str`)
- Multi-line block scalars (`|`, `>`)
- Tabs in indentation
- Nested flow style (only one level allowed)
Public API:
parse_yaml_subset(text) -> dict[str, object]
Top level must be a mapping.
parse_frontmatter(text) -> (dict, body_text)
Strips `---` delimiters, parses content as YAML subset, returns
the verbatim body text after the closing fence.
46 unit tests covering every construct the real manifest files use
(the cred_proxy.routes structure, role-as-inline-list, nested
ExtraHosts dicts) plus every rejection case listed in PRD 0011.
