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test/test_grammar_helper_ut.hpp

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+//: test_grammar_ut.hpp
+
+// vb6_parser
+// Copyright (c) 2022 Federico Aponte
+// This code is licensed under GNU Software License (see LICENSE.txt for details)
+
+#pragma once
+
+#include "color_console.hpp"
+#include "vb6_config.hpp"
+
+#include <boost/spirit/home/x3.hpp>
+
+#include <iostream>
+#include <string_view>
+#include <utility>
+
+template <class ruleType, class attrType>
+std::pair<bool, std::string_view> test_grammar(std::string_view fragment, ruleType rule, attrType& attr)
+{
+  namespace x3 = boost::spirit::x3;
+
+  auto it1 = cbegin(fragment);
+  auto const it2 = cend(fragment);
+
+  std::stringstream out;
+
+  vb6_grammar::error_handler_type error_handler(it1, it2, out, "source.bas");
+
+  auto const parser =
+    // we pass our error handler to the parser so we can access
+    // it later on in our on_error and on_success handlers
+    x3::with<vb6_grammar::vb6_error_handler_tag>(std::ref(error_handler))
+    [
+      rule
+    ];
+
+  bool res = x3::phrase_parse(it1, it2, parser, vb6_grammar::skip, attr);
+
+  return std::make_pair(res, std::string_view(it1, it2));
+}