467 lines
14 KiB
Erlang
467 lines
14 KiB
Erlang
%%%-------------------------------------------------------------------
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%%% @author Robert Virding
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%%% @copyright (C) 2019, Aeternity Anstalt
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%%% @doc
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%%% ACI interface
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%%% @end
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%%% Created : 12 Jan 2019
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%%%-------------------------------------------------------------------
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-module(aeso_aci).
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-export([encode/1,encode/2,decode/1]).
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-export([encode_contract/1,encode_contract/2,decode_contract/1]).
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-export([encode_type/1,encode_types/1,
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encode_stmt/1,encode_expr/1,encode_exprs/1]).
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%% Define records for the various typed syntactic forms. These make
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%% the code easier but don't seem to exist elsewhere.
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%% Top-level
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-record(contract, {ann,con,decls}).
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%% -record(namespace, {ann,con,decls}).
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-record(letfun, {ann,id,args,type,body}).
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-record(type_def, {ann,id,vars,typedef}).
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%% Types
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-record(app_t, {ann,id,fields}).
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-record(tuple_t, {ann,args}).
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-record(bytes_t, {ann,len}).
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-record(record_t, {fields}).
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-record(field_t, {ann,id,type}).
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-record(alias_t, {type}).
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-record(variant_t, {cons}).
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-record(constr_t, {ann,con,args}).
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-record(fun_t, {ann,named,args,type}).
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%% Tokens
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-record(arg, {ann,id,type}).
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-record(id, {ann,name}).
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-record(con, {ann,name}).
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-record(qid, {ann,names}).
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-record(qcon, {ann,names}).
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-record(tvar, {ann,name}).
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%% Statements
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-record('if', {ann,test,true,false}).
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%% Expressions
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-record(bool, {ann,bool}).
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-record(int, {ann,value}).
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-record(string, {ann,bin}).
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-record(bytes, {ann,bin}).
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-record(tuple, {ann,args}).
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-record(list, {ann,args}).
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-record(record, {ann,fields}).
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-record(field, {ann,name,value}). %A record field
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-record(proj, {ann,value}). %?
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-record(map, {ann,fields}).
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-record(app, {ann,func,args}).
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-record(typed, {ann,expr,type}).
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%% encode_contract(ContractString) -> {ok,JSON} | {error,String}.
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%% encode_contract(ContractString, Options) -> {ok,JSON} | {error,String}.
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%% Build a JSON structure with lists and tuples, not maps, as this
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%% allows us to order the fields in the contructed JSON string.
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encode(C) -> encode_contract(C).
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encode(C, Os) -> encode_contract(C, Os).
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encode_contract(ContractString) ->
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encode_contract(ContractString, []).
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encode_contract(ContractString, Options) when is_binary(ContractString) ->
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encode_contract(binary_to_list(ContractString), Options);
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encode_contract(ContractString, Options) ->
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try
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Ast = parse(ContractString, Options),
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%% io:format("Ast\n~p\n", [Ast]),
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%% aeso_ast:pp(Ast),
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TypedAst = aeso_ast_infer_types:infer(Ast, Options),
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%% io:format("Typed ast\n~p\n", [TypedAst]),
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%% aeso_ast:pp_typed(TypedAst),
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%% We find and look at the last contract.
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Contract = lists:last(TypedAst),
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Cname = contract_name(Contract),
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Tdefs = [ encode_typedef(T) ||
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T <- sort_decls(contract_types(Contract)) ],
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Fdefs = [ encode_func(F) || F <- sort_decls(contract_funcs(Contract)),
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not is_private_func(F) ],
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Jmap = [{<<"contract">>, [{<<"name">>, encode_name(Cname)},
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{<<"type_defs">>, Tdefs},
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{<<"functions">>, Fdefs}]}],
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%% io:format("~p\n", [Jmap]),
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{ok,jsx:encode(Jmap)}
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catch
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%% The compiler errors.
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error:{parse_errors, Errors} ->
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{error, join_errors("Parse errors", Errors, fun(E) -> E end)};
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error:{type_errors, Errors} ->
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{error, join_errors("Type errors", Errors, fun(E) -> E end)};
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error:{code_errors, Errors} ->
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{error, join_errors("Code errors", Errors,
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fun (E) -> io_lib:format("~p", [E]) end)}
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%% General programming errors in the compiler just signal error.
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end.
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join_errors(Prefix, Errors, Pfun) ->
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Ess = [ Pfun(E) || E <- Errors ],
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list_to_binary(string:join([Prefix|Ess], "\n")).
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%% encode_func(Function) -> JSON
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%% Encode a function definition. Currently we are only interested in
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%% the interface and type.
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encode_func(Fdef) ->
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Name = function_name(Fdef),
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Args = function_args(Fdef),
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Type = function_type(Fdef),
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[{<<"name">>, encode_name(Name)},
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{<<"arguments">>, encode_args(Args)},
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{<<"returns">>, encode_type(Type)},
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{<<"stateful">>, is_stateful_func(Fdef)}].
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%% encode_args(Args) -> [JSON].
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%% encode_arg(Args) -> JSON.
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encode_args(Args) ->
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[ encode_arg(A) || A <- Args ].
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encode_arg(#arg{id=Id,type=T}) ->
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[{<<"name">>,encode_type(Id)},
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{<<"type">>,[encode_type(T)]}].
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%% encode_types(Types) -> [JSON].
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%% encode_type(Type) -> JSON.
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encode_types(Types) ->
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[ encode_type(T) || T <- Types ].
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encode_type(#tvar{name=N}) -> encode_name(N);
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encode_type(#id{name=N}) -> encode_name(N);
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encode_type(#con{name=N}) -> encode_name(N);
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encode_type(#qid{names=Ns}) ->
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encode_name(lists:join(".", Ns));
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encode_type(#qcon{names=Ns}) ->
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encode_name(lists:join(".", Ns)); %?
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encode_type(#tuple_t{args=As}) ->
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Eas = encode_types(As),
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[{<<"tuple">>,Eas}];
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encode_type(#bytes_t{len=Len}) ->
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{<<"bytes">>, Len};
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encode_type(#record_t{fields=Fs}) ->
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Efs = encode_rec_field_types(Fs),
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[{<<"record">>,Efs}];
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%% Special case lists and maps as they are built-in types.
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encode_type(#app_t{id=#id{name="list"},fields=[F]}) ->
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Ef = encode_type(F),
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[{<<"list">>,Ef}];
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encode_type(#app_t{id=#id{name="map"},fields=Fs}) ->
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Ef = encode_map_field_type(Fs),
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[{<<"map">>,Ef}];
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%% Other applications.
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encode_type(#app_t{id=Id,fields=Fs}) ->
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Name = encode_type(Id),
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Efs = encode_types(Fs),
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[{Name,Efs}];
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encode_type(#variant_t{cons=Cs}) ->
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Ecs = encode_types(Cs),
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[{<<"variant">>,Ecs}];
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encode_type(#constr_t{con=C,args=As}) ->
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Ec = encode_type(C),
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Eas = encode_types(As),
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[{Ec,Eas}];
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encode_type(#fun_t{args=As,type=T}) ->
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Eas = encode_types(As),
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Et = encode_type(T),
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[{<<"function">>,[{<<"arguments">>,Eas},{<<"returns">>,Et}]}].
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encode_name(Name) ->
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list_to_binary(Name).
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%% encode_rec_field_types(Fields) -> [JSON].
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%% encode_rec_field_type(Field) -> JSON.
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%% Encode a record field type.
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encode_rec_field_types(Fs) ->
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[ encode_rec_field_type(F) || F <- Fs ].
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encode_rec_field_type(#field_t{id=Id,type=T}) ->
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[{<<"name">>,encode_type(Id)},
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{<<"type">>,encode_type(T)}].
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%% encode_map_field_type(Field) -> JSON.
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%% Two fields for one map type.
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encode_map_field_type([K,V]) ->
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[{<<"key">>,encode_type(K)},
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{<<"value">>,encode_type(V)}].
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%% encode_typedef(TypeDef) -> JSON.
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encode_typedef(Type) ->
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Name = typedef_name(Type),
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Vars = typedef_vars(Type),
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Def = typedef_def(Type),
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[{<<"name">>, encode_name(Name)},
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{<<"vars">>, encode_tvars(Vars)},
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{<<"typedef">>, encode_alias(Def)}].
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encode_tvars(Vars) ->
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[ encode_tvar(V) || V <- Vars ].
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encode_tvar(#tvar{name=N}) ->
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[{<<"name">>, encode_name(N)}].
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encode_alias(#alias_t{type=T}) ->
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encode_type(T);
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encode_alias(A) -> encode_type(A).
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%% encode_stmt(Stmt) -> JSON.
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encode_stmt(#typed{expr=E}) -> %Ignore the type
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encode_stmt(E);
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encode_stmt(#'if'{test=Test,true=True,false=False}) ->
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Etest = encode_expr(Test),
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Etrue = encode_stmt(True),
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Efalse = encode_stmt(False),
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[{<<"if">>,[{<<"test">>,Etest},{<<"true">>,Etrue},{<<"false">>,Efalse}]}];
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encode_stmt(E) ->
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encode_expr(E).
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%% encode_exprs(Exprs) -> [JSON].
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%% encode_expr(Expr) -> JSON.
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encode_exprs(Es) ->
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[ encode_expr(E) || E <- Es ].
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encode_expr(#typed{expr=E}) -> %Ignore the type
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encode_expr(E);
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encode_expr(#id{name=N}) -> encode_name(N);
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encode_expr(#con{name=N}) -> encode_name(N);
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encode_expr(#qid{names=Ns}) ->
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encode_name(lists:join(".", Ns));
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encode_expr(#qcon{names=Ns}) ->
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encode_name(lists:join(".", Ns)); %?
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encode_expr(#bool{bool=B}) -> B;
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encode_expr(#int{value=V}) -> V;
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encode_expr(#string{bin=B}) -> B;
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encode_expr(#bytes{bin=B}) -> B;
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encode_expr(#tuple{args=As}) ->
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Eas = encode_exprs(As),
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[{<<"tuple">>,Eas}];
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encode_expr(#list{args=As}) ->
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Eas = encode_exprs(As),
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[{<<"list">>,Eas}];
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encode_expr(#record{fields=Fs}) ->
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Efs = encode_rec_field_exprs(Fs),
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[{<<"record">>,Efs}];
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encode_expr(#map{fields=Fs}) ->
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Efs = encode_map_field_exprs(Fs),
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[{<<"map">>,Efs}];
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encode_expr(#proj{value=V}) ->
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encode_expr(V);
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encode_expr(#app{func=F,args=As}) ->
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Ef = encode_expr(F),
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Eas = encode_exprs(As),
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[{<<"apply">>,[{<<"function">>,Ef},
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{<<"arguments">>,Eas}]}];
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encode_expr({Op,_Ann}) ->
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list_to_binary(atom_to_list(Op)).
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%% encode_rec_field_exprs(Fields) -> [JSON].
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%% encode_rec_field_expr(Field) -> JSON.
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%% Encode a record field expression.
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encode_rec_field_exprs(Fs) ->
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[ encode_rec_field_expr(F) || F <- Fs ].
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encode_rec_field_expr(#field{name=[N],value=V}) ->
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[{<<"name">>,encode_expr(N)},
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{<<"value">>,encode_expr(V)}].
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%% encode_map_field_exprs(Fields) -> [JSON].
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%% encode_map_field_expr(Field) -> JSON.
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%% Encode a map field expression.
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encode_map_field_exprs(Fs) ->
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[ encode_map_field_expr(F) || F <- Fs ].
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encode_map_field_expr({K,V}) ->
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[{<<"key">>,encode_expr(K)},
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{<<"value">>,encode_expr(V)}].
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%% decode_contract(JSON) -> ContractString.
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%% Decode a JSON string and generate a suitable contract string which
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%% can be included in a contract definition. We decode into a map
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%% here as this is easier to work with and order is not important.
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decode(J) -> decode_contract(J).
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decode_contract(Json) ->
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Map = jsx:decode(Json, [return_maps]),
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%% io:format("~p\n", [Map]),
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#{<<"contract">> := C} = Map,
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#{<<"name">> := Name, <<"type_defs">> := Ts, <<"functions">> := Fs} = C,
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CS = ["contract"," ",io_lib:format("~s", [Name])," =\n",
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decode_tdefs(Ts),
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decode_funcs(Fs)],
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list_to_binary(CS).
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decode_funcs(Fs) -> [ decode_func(F) || F <- Fs ].
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decode_func(#{<<"name">> := <<"init">>}) -> [];
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decode_func(#{<<"name">> := Name,<<"arguments">> := As,<<"returns">> := T}) ->
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[" function"," ",io_lib:format("~s", [Name])," : ",
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decode_args(As)," => ",decode_type(T),$\n].
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decode_args(As) ->
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Das = [ decode_arg(A) || A <- As ],
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[$(,lists:join(", ", Das),$)].
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decode_arg(#{<<"type">> := [T]}) -> decode_type(T).
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decode_types(Ets) ->
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[ decode_type(Et) || Et <- Ets ].
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decode_type(#{<<"tuple">> := Ets}) ->
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Ts = decode_types(Ets),
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[$(,lists:join(", ", Ts),$)];
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decode_type(#{<<"record">> := Efs}) ->
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Fs = decode_rec_field_types(Efs),
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[${,lists:join(", ", Fs),$}];
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decode_type(#{<<"list">> := Et}) ->
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T = decode_type(Et),
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["list",$(,T,$)];
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decode_type(#{<<"map">> := Et}) ->
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T = decode_map_type(Et),
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["map",$(,T,$)];
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decode_type(#{<<"variant">> := Ets}) ->
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Ts = decode_types(Ets),
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lists:join(" | ", Ts);
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decode_type(Econs) when is_map(Econs) -> %General constructor
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%% io:format("~p\n", [Econs]),
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[{Ec,Ets}] = maps:to_list(Econs),
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C = decode_name(Ec),
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Ts = decode_types(Ets),
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[C,$(,lists:join(", ", Ts),$)];
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decode_type(T) -> %Just raw names.
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decode_name(T).
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decode_name(En) ->
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binary_to_list(En).
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decode_rec_field_types(Efs) ->
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[ decode_rec_field_type(Ef) || Ef <- Efs ].
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decode_rec_field_type(#{<<"name">> := En,<<"type">> := Et}) ->
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Name = decode_name(En),
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Type = decode_type(Et),
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[Name," : ",Type].
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decode_map_type(#{<<"key">> := Ek,<<"value">> := Ev}) ->
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Key = decode_type(Ek),
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Value = decode_type(Ev),
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[Key,", ",Value].
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%% decode_tdefs(Json) -> [TypeString].
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%% Here we are only interested in the type definitions and ignore the
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%% aliases. We find them as they always have variants.
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decode_tdefs(Ts) -> [ decode_tdef(T) ||
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#{<<"typedef">> := #{<<"variant">> := _}} = T <- Ts
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].
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decode_tdef(#{<<"name">> := Name,<<"vars">> := Vs,<<"typedef">> := T}) ->
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[" datatype"," ",decode_name(Name),decode_tvars(Vs),
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" = ",decode_type(T),$\n].
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decode_tvars([]) -> []; %No tvars, no parentheses
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decode_tvars(Vs) ->
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Dvs = [ decode_tvar(V) || V <- Vs ],
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[$(,lists:join(", ", Dvs),$)].
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decode_tvar(#{<<"name">> := N}) -> io_lib:format("~s", [N]).
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%% #contract{Ann, Con, [Declarations]}.
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contract_name(#contract{con=#con{name=N}}) -> N.
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contract_funcs(#contract{decls=Decls}) ->
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[ D || D <- Decls, is_record(D, letfun) ].
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contract_types(#contract{decls=Decls}) ->
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[ D || D <- Decls, is_record(D, type_def) ].
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%% To keep dialyzer happy and quiet.
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%% namespace_name(#namespace{con=#con{name=N}}) -> N.
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%%
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%% namespace_funcs(#namespace{decls=Decls}) ->
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%% [ D || D <- Decls, is_record(D, letfun) ].
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%%
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%% namespace_types(#namespace{decls=Decls}) ->
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%% [ D || D <- Decls, is_record(D, type_def) ].
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sort_decls(Ds) ->
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Sort = fun (D1, D2) ->
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aeso_syntax:get_ann(line, D1, 0) =<
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aeso_syntax:get_ann(line, D2, 0)
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end,
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lists:sort(Sort, Ds).
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%% #letfun{Ann, Id, [Arg], Type, Typedef}.
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function_name(#letfun{id=#id{name=N}}) -> N.
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function_args(#letfun{args=Args}) -> Args.
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function_type(#letfun{type=Type}) -> Type.
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is_private_func(#letfun{ann=A}) -> aeso_syntax:get_ann(private, A, false).
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is_stateful_func(#letfun{ann=A}) -> aeso_syntax:get_ann(stateful, A, false).
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%% #type_def{Ann, Id, [Var], Typedef}.
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typedef_name(#type_def{id=#id{name=N}}) -> N.
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typedef_vars(#type_def{vars=Vars}) -> Vars.
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typedef_def(#type_def{typedef=Def}) -> Def.
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%% parse(ContractString, Options) -> {ok,AST}.
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%% Signal errors, the sophia compiler way. Sigh!
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parse(Text, Options) ->
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%% Try and return something sensible here!
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case aeso_parser:string(Text, Options) of
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%% Yay, it worked!
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{ok, Contract} -> Contract;
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%% Scan errors.
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{error, {Pos, scan_error}} ->
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parse_error(Pos, "scan error");
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{error, {Pos, scan_error_no_state}} ->
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parse_error(Pos, "scan error");
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%% Parse errors.
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{error, {Pos, parse_error, Error}} ->
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parse_error(Pos, Error);
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{error, {Pos, ambiguous_parse, As}} ->
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ErrorString = io_lib:format("Ambiguous ~p", [As]),
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parse_error(Pos, ErrorString);
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%% Include error
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{error, {Pos, include_error, File}} ->
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parse_error(Pos, io_lib:format("could not find include file '~s'", [File]))
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end.
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parse_error(Pos, ErrorString) ->
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%% io:format("Error ~p ~p\n", [Pos,ErrorString]),
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Error = io_lib:format("~s: ~s", [pos_error(Pos), ErrorString]),
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error({parse_errors, [Error]}).
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pos_error({Line, Pos}) ->
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io_lib:format("line ~p, column ~p", [Line, Pos]);
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pos_error({no_file, Line, Pos}) ->
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pos_error({Line, Pos});
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pos_error({File, Line, Pos}) ->
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io_lib:format("file ~s, line ~p, column ~p", [File, Line, Pos]).
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