fix #75: unknown keywords may contain sub-schemas

Now when an unknown keyword appears and its value is an object,
sub-unknown-keywords are inserted as possible sub-schemas.

src/json-validator.cpp

@@ -130,7 +130,7 @@ public:
 	{
 		auto &file = get_or_create_file(uri.location());
 		auto new_uri = uri.append(key);
-		auto fragment = new_uri.fragment();
+		auto fragment = new_uri.pointer();
 
 		// is there a reference looking for this unknown-keyword, which is thus no longer a unknown keyword but a schema
 		auto unresolved = file.unresolved.find(fragment);
@@ -138,6 +138,11 @@ public:
 			schema::make(value, this, {}, {{new_uri}});
 		else // no, nothing ref'd it, keep for later
 			file.unknown_keywords[fragment] = value;
+
+		// recursively add possible subschemas of unknown keywords
+		if (value.type() == json::value_t::object)
+			for (auto &subsch : value.items())
+				insert_unknown_keyword(new_uri, subsch.key(), subsch.value());
 	}
 
 	std::shared_ptr<schema> get_or_create_ref(const json_uri &uri)
@@ -151,7 +156,7 @@ public:
 
 		// referencing an unknown keyword, turn it into schema
 		try {
-			auto &subschema = file.unknown_keywords.at(uri.fragment());
+			auto &subschema = file.unknown_keywords.at(uri.pointer());
 			auto s = schema::make(subschema, this, {}, {{uri}});
 			file.unknown_keywords.erase(uri.fragment());
 			return s;

test/issue-75/CMakeLists.txt

@@ -0,0 +1,3 @@
+add_test_simple_schema(Issue::75
+                       ${CMAKE_CURRENT_SOURCE_DIR}/schema.json
+                       ${CMAKE_CURRENT_SOURCE_DIR}/instance.json)

test/issue-75/TypeId.json

@@ -0,0 +1,10 @@
+{
+    "data" : {
+        "TypeId" : {
+            "type" : "string",
+            "description" : "POD type of data matching bmf::data::TypeId enum",
+            "enum" : [ "CHAR", "UCHAR", "SHORT", "USHORT", "INT", "UINT",
+                       "LONG", "ULONG", "FLOAT", "DOUBLE" ]
+       }
+    }
+}

test/issue-75/instance.json

@@ -0,0 +1 @@
+["INT", "LONG"]

test/issue-75/schema.json

@@ -0,0 +1,6 @@
+{
+    "type" : "array",
+    "items": {
+        "$ref": "TypeId.json#/data/TypeId"
+    }
+}