From 265c88664b93f9069c86bf6c25e5d07b7f41d2dc Mon Sep 17 00:00:00 2001
From: Anders Svensson <anders@erlang.org>
Date: Mon, 23 Sep 2013 10:31:21 +0200
Subject: Extend diameter_make:codec/2

Function can now take a literal dictionary as input, instead of a path,
and can return results instead of writing them to the filesystem.
---
 lib/diameter/src/compiler/diameter_make.erl | 105 +++++++++++++++++++++-------
 1 file changed, 80 insertions(+), 25 deletions(-)

(limited to 'lib/diameter/src/compiler/diameter_make.erl')

diff --git a/lib/diameter/src/compiler/diameter_make.erl b/lib/diameter/src/compiler/diameter_make.erl
index e4486973dd..c883eb91a9 100644
--- a/lib/diameter/src/compiler/diameter_make.erl
+++ b/lib/diameter/src/compiler/diameter_make.erl
@@ -39,30 +39,40 @@
 
 -export_type([opt/0]).
 
+%% Options passed to codec/2.
 -type opt() :: {include|outdir|name|prefix|inherits, string()}
+             | return
              | verbose
              | debug.
 
+%% Literal dictionary or path. A NL of CR identifies the former.
+-type dict() :: iolist()
+              | binary().
+
+%% Name of a literal dictionary if otherwise unspecified.
+-define(DEFAULT_DICT_NAME, "dictionary.dia").
+
 %% ===========================================================================
 
 %% codec/1-2
 %%
-%% Parse a dictionary file and generate a codec module.
+%% Parse a dictionary file and generate a codec module. Input
+%% dictionary can be either a path or the dictionary itself: the
+%% occurrence of \n or \r in the argument is used to distinguish the
+%% two.
 
--spec codec(Path, [opt()])
+-spec codec(File, [opt()])
    -> ok
+    | {ok, Ret}
     | {error, Reason}
- when Path :: string(),
+ when File :: dict(),
+      Ret  :: list(),  %% [Erl, Hrl | Debug], Debug = [] | [ParseD, Forms]
       Reason :: string().
 
 codec(File, Opts) ->
-    case dict(File, Opts) of
-        {ok, Dict} ->
-            make(File,
-                 Opts,
-                 Dict,
-                 lists:append([[dict, forms] || lists:member(debug, Opts)])
-                 ++ [erl, hrl]);
+    case to_dict(File, Opts) of
+        {ok, {Dict, Dictish}} ->
+            make(file(Dictish), Opts, Dict);
         {error, _} = E ->
             E
     end.
@@ -70,30 +80,63 @@ codec(File, Opts) ->
 codec(File) ->
     codec(File, []).
 
+file({path, Path}) ->
+    Path;
+file(_) ->
+    ?DEFAULT_DICT_NAME.
+
 %% dict/2
 %%
 %% Parse a dictionary file and return the orddict that a codec module
 %% returns from dict/0.
 
--spec dict(string(), [opt()])
+-spec dict(File, [opt()])
    -> {ok, orddict:orddict()}
-    | {error, string()}.
+    | {error, string()}
+  when File :: dict().
 
-dict(Path, Opts) ->
-    case diameter_dict_util:parse({path, Path}, Opts) of
-        {ok, _} = Ok ->
-            Ok;
-        {error = E, Reason} ->
-            {E, diameter_dict_util:format_error(Reason)}
+dict(File, Opts) ->
+    case to_dict(File, Opts) of
+        {ok, {Dict, _}} ->
+            {ok, Dict};
+        {error, _} = E ->
+            E
     end.
 
 dict(File) ->
     dict(File, []).
 
+%% to_dict/2
+
+to_dict(File, Opts) ->
+    Dictish = maybe_path(File),
+    case diameter_dict_util:parse(Dictish, Opts) of
+        {ok, Dict} ->
+            {ok, {Dict, Dictish}};
+        {error = E, Reason} ->
+            {E, diameter_dict_util:format_error(Reason)}
+    end.
+
+maybe_path(File) ->
+    Bin = iolist_to_binary([File]),
+    case is_path(Bin) of
+        true  -> {path, File};
+        false -> Bin
+    end.
+
+%% Interpret anything containing \n or \r as a literal dictionary,
+%% otherwise a path. (Which might be the wrong guess in the worst case.)
+is_path(Bin) ->
+    try
+        [throw(C) || <<C>> <= Bin, $\n == C orelse $\r == C],
+        true
+    catch
+        throw:_ -> false
+    end.
+
 %% format/1
 %%
-%% Turn an orddict returned by dict/1-2 back into a dictionary file
-%% in the form of an iolist().
+%% Turn an orddict returned by dict/1-2 back into a dictionary.
 
 -spec format(orddict:orddict())
    -> iolist().
@@ -108,7 +151,7 @@ format(Dict) ->
 -spec reformat(File)
    -> {ok, iolist()}
     | {error, Reason}
- when File :: string(),
+ when File :: dict(),
       Reason :: string().
 
 reformat(File) ->
@@ -121,12 +164,24 @@ reformat(File) ->
 
 %% ===========================================================================
 
-make(_, _, _, []) ->
+make(File, Opts, Dict) ->
+    ok(lists:foldl(fun(M,A) -> [make(File, Opts, Dict, M) | A] end,
+                   [],
+                   lists:append([[dict, forms] || lists:member(debug, Opts)])
+                   ++ [erl, hrl])).
+%% The order in which results are generated (dict/forms/erl/hrl) is
+%% intentional, in order of more processing (except for hrl, which
+%% isn't needed by diameter itself), since an error raises an
+%% exception. The order of return results is the reverse.
+
+ok([ok,_|_]) ->
     ok;
-make(File, Opts, Dict, [Mode | Rest]) ->
+ok([_,_|_] = L) ->
+    {ok, L}.
+
+make(File, Opts, Dict, Mode) ->
     try
-        ok = diameter_codegen:from_dict(File, Dict, Opts, Mode),
-        make(File, Opts, Dict, Rest)
+        diameter_codegen:from_dict(File, Dict, Opts, Mode)
     catch
         error: Reason ->
             erlang:error({Reason, Mode, erlang:get_stacktrace()})
-- 
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