add basic test harness for grammer validation

parser/main.cpp

@@ -1,7 +0,0 @@
-#include "parser.hpp"
-
-int main( int argc, char ** argv )
-{
-    realm::parser::parse(argv[1]);
-}
-

parser/parser.cpp

@@ -137,7 +137,6 @@ struct ParserState
 template< typename Rule >
 struct action : nothing< Rule > {};
 
-#define REALM_PARSER_PRINT_TOKENS
 #ifdef REALM_PARSER_PRINT_TOKENS
     #define DEBUG_PRINT_TOKEN(string) std::cout << string << std::endl
 #else

parser/test.cpp

@@ -0,0 +1,45 @@
+
+#include "parser.hpp"
+
+#include <vector>
+#include <string>
+#include <exception>
+#include <iostream>
+
+static std::vector<std::string> valid_queries = {
+    "truepredicate",
+    "falsepredicate",
+    "TRUEPREDICATE",
+    "FALSEPREDICATE",
+    "truepredicate && truepredicate"
+};
+
+static std::vector<std::string> invalid_queries = {
+    "predicate",
+    "truepredicate &&",
+    "truepredicate & truepredicate",
+};
+
+int main( int argc, char ** argv )
+{
+    for (auto &query : valid_queries) {
+        std::cout << "valid query: " << query << std::endl;
+        try {
+            realm::parser::parse(query);
+        } catch (std::exception &ex) {
+            std::cout << "FAILURE - " << ex.what() << std::endl;
+        }
+    }
+
+    for (auto &query : invalid_queries) {
+        std::cout << "invalid query: " << query << std::endl;
+        try {
+            realm::parser::parse(query);
+        } catch (std::exception &ex) {
+            // std::cout << "message: " << ex.what() << std::endl;
+            continue;
+        }
+        std::cout << "FAILURE - query should throw an exception" << std::endl;
+    }
+}
+

parser/test.sh

@@ -0,0 +1,3 @@
+# /bin/sh
+llvm-g++ -std=c++11 -I ../../../vendor/PEGTL/ -o test test.cpp parser.cpp
+./test