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scmi_analyze_program.erl
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scmi_analyze_program.erl
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%%% The MIT License
%%%
%%% Copyright (C) 2013-2015 by Joseph Wayne Norton <norton@alum.mit.edu>
%%%
%%% Permission is hereby granted, free of charge, to any person obtaining a copy
%%% of this software and associated documentation files (the "Software"), to deal
%%% in the Software without restriction, including without limitation the rights
%%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
%%% copies of the Software, and to permit persons to whom the Software is
%%% furnished to do so, subject to the following conditions:
%%%
%%% The above copyright notice and this permission notice shall be included in
%%% all copies or substantial portions of the Software.
%%%
%%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
%%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
%%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
%%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
%%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
%%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
%%% THE SOFTWARE.
%%% @doc Scheme interpreter syntactic analyzer for program expressions
%%% @author Joseph Wayne Norton <norton@alum.mit.edu>
-module(scmi_analyze_program).
%% SCMI Exports
-export(['$scmi_exports'/0]).
%% External exports
-export([analyze_import/2
, analyze_define/2
, analyze_define_values/2
, analyze_define_syntax/2
, analyze_define_record_type/2
, analyze_define_library/2
]).
%% Internal imports
-import(scmi_analyze, [analyze/2, validate_variable/1, validate_variables/1, flatten_variables/1, make_tmp_variables/1]).
-include("scmi_analyze.hrl").
%%%----------------------------------------------------------------------
%%% Types/Specs/Records
%%%----------------------------------------------------------------------
%%%----------------------------------------------------------------------
%%% SCMI Exports
%%%----------------------------------------------------------------------
-spec '$scmi_exports'() -> [{scm_symbol(), scmi_expander()}].
'$scmi_exports'() ->
[{'import', #expander{val=fun ?MODULE:'analyze_import'/2}}
, {'define', #expander{val=fun ?MODULE:'analyze_define'/2}}
, {'define-values', #expander{val=fun ?MODULE:'analyze_define_values'/2}}
, {'define-syntax', #expander{val=fun ?MODULE:'analyze_define_syntax'/2}}
, {'define-record-type', #expander{val=fun ?MODULE:'analyze_define_record_type'/2}}
, {'define-library', #expander{val=fun ?MODULE:'analyze_define_library'/2}}
].
%%%----------------------------------------------------------------------
%%% API
%%%----------------------------------------------------------------------
-spec analyze_import(scmi_exp(), scmi_senv()) -> scmi_dexec().
analyze_import(Exp, SEnv) ->
%% @TODO
erlang:error({roadmap,'v0.6.0'}, [Exp, SEnv]).
-spec analyze_define(scmi_exp(), scmi_senv()) -> scmi_dexec().
analyze_define([Variable, Exp], SEnv) when not is_list(Variable) ->
validate_variable(Variable), % validate variable
Exec = analyze(Exp, SEnv),
fun(Env, Ok, Ng) ->
%% execute operands
Exec(Env,
fun(Val, Ng1) ->
%% define value
scmi_env:define_variable(Variable, Val, Env),
Ok(?FALSE,
fun(Err) -> Ng1(Err) end)
end,
Ng)
end;
analyze_define(Exp, SEnv) ->
analyze(expand_define(Exp), SEnv).
-spec analyze_define_values(scmi_exp(), scmi_senv()) -> scmi_dexec().
analyze_define_values(Exp, SEnv) ->
analyze(expand_define_values(Exp), SEnv).
-spec analyze_define_syntax(scmi_exp(), scmi_senv()) -> scmi_dexec().
analyze_define_syntax([Variable, Exp]=Exp0, #senv{env=Env}=SEnv) when not is_list(Variable) ->
validate_variable(Variable), % validate variable
case analyze(Exp, SEnv) of
#expander{defref=DefRef}=Val ->
scmi_env:define_variable(Variable, Val, Env),
fun(DefEnv, Ok, Ng) ->
%% define marker for macro identifiers
scmi_env:define_variable(DefRef, ?UNASSIGNED, DefEnv),
Ok(?FALSE, Ng) end;
_ ->
erlang:error(badarg, [Exp0, SEnv])
end;
analyze_define_syntax(Exp, SEnv) ->
erlang:error(badarg, [Exp, SEnv]).
-spec analyze_define_record_type(scmi_exp(), scmi_senv()) -> scmi_dexec().
analyze_define_record_type(Exp, SEnv) ->
%% @TODO
erlang:error({roadmap,'v0.5.5'}, [Exp, SEnv]).
-spec analyze_define_library(scmi_exp(), scmi_senv()) -> scmi_dexec().
analyze_define_library(Exp, SEnv) ->
%% @TODO
erlang:error({roadmap,'v0.6.0'}, [Exp, SEnv]).
%%%----------------------------------------------------------------------
%%% Internal functions
%%%----------------------------------------------------------------------
%% define
expand_define([[Variable|Formal]|Body]) when not is_list(Variable), not is_list(Formal) ->
make_define(Variable, make_lambda(Formal, Body));
expand_define([[[Variable|Formals]|Formal]|Body]) when not is_list(Variable), is_list(Formals), not is_list(Formal) ->
make_define(Variable, make_lambda([Formals|Formal], Body));
expand_define([[Variable|Formals]|Body]) when not is_list(Variable), is_list(Formals) ->
make_define(Variable, make_lambda(Formals, Body)).
%% define-values
expand_define_values([[], Body]) ->
make_begin(Body ++ [?FALSE]);
expand_define_values([Formals|Body]) ->
Tmps = make_tmp_variables(Formals),
Fs = flatten_variables(Formals),
validate_variables(Fs), % validate formals
Ts = flatten_variables(Tmps),
Defines = [ make_define(F, ?UNASSIGNED) || F <- Fs ],
Sets = [ make_setb(F, T) || {F, T} <- lists:zip(Fs, Ts) ],
Producer = make_thunk(Body),
Consumer = make_lambda(Tmps, Sets),
make_begin(Defines ++ [make_call_with_values(Producer, Consumer), ?FALSE]).