first step moving json project into jsx tree, compiles, but not tested

src/jsx_verify.erl

@@ -0,0 +1,77 @@
+%% The MIT License
+
+%% Copyright (c) 2010 Alisdair Sullivan <alisdairsullivan@yahoo.ca>
+
+%% 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.
+
+
+-module(jsx_verify).
+-author("alisdairsullivan@yahoo.ca").
+
+-export([is_json/2]).
+
+-include("./include/jsx_types.hrl").
+
+
+
+-spec is_json(JSON::binary(), Opts::verify_opts()) -> true | false.
+
+is_json(JSON, Opts) ->
+    Encoding = proplists:get_value(encoding, Opts, utf8),
+    P = jsx:parser([{encoding, Encoding}]),
+    case proplists:get_value(strict, Opts, true) of
+        true -> collect_strict(P(JSON), Opts)
+        ; false -> collect(P(JSON), Opts)
+    end.
+    
+
+%% enforce only arrays and objects at top level
+collect_strict({event, start_object, Next}, Keys) ->
+    collect(Next(), Keys);
+collect_strict({event, start_array, Next}, Keys) ->
+    collect(Next(), Keys);
+collect_strict(_, _) ->
+    false.
+    
+%% make sure to ensure tail is clean
+collect({event, end_json, Next}, _Keys) ->
+    case Next() of
+        {incomplete, More} -> case More(end_stream) of
+            ok -> true
+            ; _ -> false
+        end
+        ; _ -> false
+    end; 
+
+        
+%% check to see if key has already been encountered, if not add it to the key accumulator
+%%   and continue, else return false 
+collect({event, {key, Key}, Next}, Keys) ->
+    case lists:member(Key, Keys) of
+        true -> false
+        ; false -> collect(Next(), [Key] ++ Keys)
+    end;
+                
+collect({event, _, Next}, Keys) ->
+    collect(Next(), Keys);
+collect(_, _) ->
+    false.
+
+    
+