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Generate Gleam code from OpenAPI 3.x specifications
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src/yaml_loc_ffi.erl
-module(yaml_loc_ffi).
-export([build_location_index/1]).
%% Build a location index from a YAML string.
%% Returns a list of {BinaryPath, {Line, Column}} tuples that Gleam can
%% convert into a Dict(String, SourceLoc).
-spec build_location_index(binary()) -> {ok, list({binary(), {integer(), integer()}})} | {error, nil}.
build_location_index(Content) ->
try
application:ensure_all_started(yamerl),
[Doc | _] = yamerl_constr:string(
binary_to_list(Content),
[{detailed_constr, true}, {keep_duplicate_keys, true}]
),
{yamerl_doc, Root} = Doc,
Acc = walk_node(Root, <<>>, []),
{ok, Acc}
catch
_:_ -> {ok, []}
end.
%% Walk a yamerl node tree and collect {Path, {Line, Col}} entries.
-spec walk_node(tuple(), binary(), list()) -> list().
walk_node(Node, Path, Acc) ->
Loc = extract_loc(Node),
Acc1 = [{Path, Loc} | Acc],
case Node of
{yamerl_map, _, _, _, Pairs} when is_list(Pairs) ->
walk_map_pairs(Pairs, Path, Acc1);
{yamerl_seq, _, _, _, Items, _Count} when is_list(Items) ->
walk_seq_items(Items, Path, 0, Acc1);
_ ->
Acc1
end.
-spec walk_map_pairs(list(), binary(), list()) -> list().
walk_map_pairs([], _ParentPath, Acc) ->
Acc;
walk_map_pairs([{KeyNode, ValueNode} | Rest], ParentPath, Acc) ->
KeyStr = node_to_key(KeyNode),
ChildPath = case ParentPath of
<<>> -> KeyStr;
_ -> <<ParentPath/binary, ".", KeyStr/binary>>
end,
Acc1 = walk_node(ValueNode, ChildPath, Acc),
walk_map_pairs(Rest, ParentPath, Acc1).
-spec walk_seq_items(list(), binary(), integer(), list()) -> list().
walk_seq_items([], _ParentPath, _Idx, Acc) ->
Acc;
walk_seq_items([Item | Rest], ParentPath, Idx, Acc) ->
IdxBin = integer_to_binary(Idx),
ChildPath = <<ParentPath/binary, "[", IdxBin/binary, "]">>,
Acc1 = walk_node(Item, ChildPath, Acc),
walk_seq_items(Rest, ParentPath, Idx + 1, Acc1).
-spec extract_loc(tuple()) -> {integer(), integer()}.
extract_loc(Node) ->
Pres = element(4, Node),
Line = proplists:get_value(line, Pres, 0),
Col = proplists:get_value(column, Pres, 0),
{Line, Col}.
-spec node_to_key(tuple()) -> binary().
node_to_key({yamerl_str, _, _, _, Text}) ->
unicode:characters_to_binary(Text);
node_to_key({yamerl_int, _, _, _, Int}) ->
integer_to_binary(Int);
node_to_key({yamerl_bool, _, _, _, true}) ->
<<"true">>;
node_to_key({yamerl_bool, _, _, _, false}) ->
<<"false">>;
node_to_key(_) ->
<<"_unknown_">>.