handle negative integers, fixes #1

Author: gavinwahl

postgres-json-schema--0.1.0.sql

@@ -4,7 +4,7 @@ BEGIN
     IF jsonb_typeof(data) != 'number' THEN
       RETURN false;
     END IF;
-    IF NOT data::text SIMILAR TO '[0-9]+' THEN
+    IF trunc(data::text::numeric) != data::text::numeric THEN
       RETURN false;
     END IF;
   ELSE

tests.sql

@@ -7,6 +7,7 @@ BEGIN
   ASSERT validate_json_schema('{"type": "number"}', '123');
   ASSERT validate_json_schema('{"type": "integer"}', '123');
   ASSERT NOT validate_json_schema('{"type": "integer"}', '123.1');
+  ASSERT validate_json_schema('{"type": "integer"}', '-103948');
   ASSERT NOT validate_json_schema('{"type": "number"}', '"a"');
   ASSERT validate_json_schema('{"type": "string"}', '"a"');
   ASSERT NOT validate_json_schema('{"type": "string"}', '{}');
@@ -55,6 +56,7 @@ BEGIN
   ASSERT validate_json_schema('{"enum": [1,2,3]}', '1');
   ASSERT NOT validate_json_schema('{"enum": [1,2,3]}', '4');
 
+
   RETURN true;
 END;
 $f$ LANGUAGE 'plpgsql';