case "jsonl":

return resolveJsonlToUniversal(ast, path);

}

return null;

}

function resolveMdToUniversal(ast: MdAst, path: OcPath): OcMatch | null {

case "item-field":

return { kind: "leaf", valueText: m.value, leafType: "string", line: m.node.line };

}

return null;

}

function resolveJsoncToUniversal(ast: JsoncAst, path: OcPath): OcMatch | null {

case "null":

return { kind: "leaf", valueText: "null", leafType: "null", line };

}

return { kind: "leaf", valueText: "null", leafType: "null", line };

}

function resolveJsonlToUniversal(ast: JsonlAst, path: OcPath): OcMatch | null {

case "jsonl":

return resolveJsonlInsertion(ast, info);

}

return null;

}

function resolveMdInsertion(ast: MdAst, info: InsertionInfo): OcMatch | null {

return r.ok ? { ok: true, ast: r.ast } : { ok: false, reason: r.reason };

});

}

return { ok: false, reason: "not-writable" };

}

// Resolve → reject root/line → coerce by existing leaf type → set →

// wrap. The optional `onLine` handles jsonl's whole-line replacement.

function setStructuredLeaf<A extends OcAst, M extends StructuredLeafMatch>(

function setStructuredLeaf<A extends OcAst>(

ast: A,

path: OcPath,

value: string,

resolve: (a: A, p: OcPath) => M | null,

resolve: (a: A, p: OcPath) => StructuredLeafMatch | null,

set: (a: A, p: OcPath, c: JsoncValue) => SetOpResult<A>,

onLine?: () => SetResult,

): SetResult {