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authorBjörn Gustavsson <[email protected]>2015-11-16 14:38:15 +0100
committerBjörn Gustavsson <[email protected]>2015-11-17 09:14:07 +0100
commit57c53b4918bafc72097315d980fea2d0f296b1bb (patch)
tree3b08ab034f333d3f4605a7464c8a9928da541581 /lib/stdlib/src
parentc1a6beef36bd89b7e50efa8df1ef71f33272de12 (diff)
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epp: Refactor scan_define()
Refactor scan_define() in order to share more between macros without any arguments and macros with arguments.
Diffstat (limited to 'lib/stdlib/src')
-rw-r--r--lib/stdlib/src/epp.erl79
1 files changed, 33 insertions, 46 deletions
diff --git a/lib/stdlib/src/epp.erl b/lib/stdlib/src/epp.erl
index 46c23fd0e0..d9a579ebc6 100644
--- a/lib/stdlib/src/epp.erl
+++ b/lib/stdlib/src/epp.erl
@@ -820,59 +820,26 @@ scan_extends(_Ts, Ms) -> Ms.
%% scan_define(Tokens, DefineToken, From, EppState)
-scan_define([{'(',_Lp},{Type,_Lm,M}=Mac,{',',_}=Comma|Toks], _Def, From, St)
+scan_define([{'(',_Lp},{Type,_Lm,_}=Mac|Toks], Def, From, St)
when Type =:= atom; Type =:= var ->
+ scan_define_1(Toks, Mac, Def, From, St);
+scan_define(_Toks, Def, From, St) ->
+ epp_reply(From, {error,{loc(Def),epp,{bad,define}}}),
+ wait_req_scan(St).
+
+scan_define_1([{',',_}=Comma|Toks], Mac,_Def, From, St) ->
case catch macro_expansion(Toks, Comma) of
Expansion when is_list(Expansion) ->
- case dict:find({atom,M}, St#epp.macs) of
- {ok, Defs} when is_list(Defs) ->
- %% User defined macros: can be overloaded
- case proplists:is_defined(none, Defs) of
- true ->
- epp_reply(From, {error,{loc(Mac),epp,{redefine,M}}}),
- wait_req_scan(St);
- false ->
- scan_define_cont(From, St,
- {atom, M},
- {none, {none,Expansion}})
- end;
- {ok, _PreDef} ->
- %% Predefined macros: cannot be overloaded
- epp_reply(From, {error,{loc(Mac),epp,{redefine_predef,M}}}),
- wait_req_scan(St);
- error ->
- scan_define_cont(From, St,
- {atom, M},
- {none, {none,Expansion}})
- end;
+ scan_define_2(none, {none,Expansion}, Mac, From, St);
{error,ErrL,What} ->
epp_reply(From, {error,{ErrL,epp,What}}),
wait_req_scan(St)
end;
-scan_define([{'(',_Lp},{Type,_Lm,M}=Mac,{'(',_Lc}|Toks], Def, From, St)
- when Type =:= atom; Type =:= var ->
+scan_define_1([{'(',_Lc}|Toks], Mac, Def, From, St) ->
case catch macro_pars(Toks, []) of
- {ok, {As,Me}} ->
+ {ok,{As,_}=MacroDef} ->
Len = length(As),
- case dict:find({atom,M}, St#epp.macs) of
- {ok, Defs} when is_list(Defs) ->
- %% User defined macros: can be overloaded
- case proplists:is_defined(Len, Defs) of
- true ->
- epp_reply(From,{error,{loc(Mac),epp,{redefine,M}}}),
- wait_req_scan(St);
- false ->
- scan_define_cont(From, St, {atom, M},
- {Len, {As, Me}})
- end;
- {ok, _PreDef} ->
- %% Predefined macros: cannot be overloaded
- %% (There are currently no predefined F(...) macros.)
- epp_reply(From, {error,{loc(Mac),epp,{redefine_predef,M}}}),
- wait_req_scan(St);
- error ->
- scan_define_cont(From, St, {atom, M}, {Len, {As, Me}})
- end;
+ scan_define_2(Len, MacroDef, Mac, From, St);
{error,ErrL,What} ->
epp_reply(From, {error,{ErrL,epp,What}}),
wait_req_scan(St);
@@ -880,10 +847,30 @@ scan_define([{'(',_Lp},{Type,_Lm,M}=Mac,{'(',_Lc}|Toks], Def, From, St)
epp_reply(From, {error,{loc(Def),epp,{bad,define}}}),
wait_req_scan(St)
end;
-scan_define(_Toks, Def, From, St) ->
+scan_define_1(_Toks, _Mac, Def, From, St) ->
epp_reply(From, {error,{loc(Def),epp,{bad,define}}}),
wait_req_scan(St).
+scan_define_2(Arity, Def, {_,_,M}=Mac, From, St) ->
+ Key = {atom,M},
+ case dict:find(Key, St#epp.macs) of
+ {ok,Defs} when is_list(Defs) ->
+ %% User defined macros: can be overloaded
+ case proplists:is_defined(Arity, Defs) of
+ true ->
+ epp_reply(From, {error,{loc(Mac),epp,{redefine,M}}}),
+ wait_req_scan(St);
+ false ->
+ scan_define_cont(From, St, Key, Arity, Def)
+ end;
+ {ok,_PreDef} ->
+ %% Predefined macros: cannot be overloaded
+ epp_reply(From, {error,{loc(Mac),epp,{redefine_predef,M}}}),
+ wait_req_scan(St);
+ error ->
+ scan_define_cont(From, St, Key, Arity, Def)
+ end.
+
%%% Detection of circular macro expansions (which would either keep
%%% the compiler looping forever, or run out of memory):
%%% When a macro is defined, we store the names of other macros it
@@ -893,7 +880,7 @@ scan_define(_Toks, Def, From, St) ->
%%% the information from St#epp.uses is traversed, and if a circularity
%%% is detected, an error message is thrown.
-scan_define_cont(F, St, M, {Arity, Def}) ->
+scan_define_cont(F, St, M, Arity, Def) ->
Ms = dict:append_list(M, [{Arity, Def}], St#epp.macs),
try dict:append_list(M, [{Arity, macro_uses(Def)}], St#epp.uses) of
U ->