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diff --git a/src/output_common.hpp b/src/output_common.hpp
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+/*
+  Copyright (c) 2015, Matthias Schiffer <mschiffer@universe-factory.net>
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#pragma once
+
+#include "generator.hpp"
+#include "codegen.hpp"
+
+
+namespace solar {
+
+class output_common_t {
+private:
+	const generator_t *generator;
+
+	std::string prefix;
+	std::string token_prefix;
+
+	std::map<std::string, unsigned> tokens;
+	std::map<symbol_t, std::string> symbol_values;
+
+protected:
+	std::string prefixed(const std::string &str) const {
+		return (prefix + str);
+	}
+
+	std::string symbol_case(const symbol_t &sym) const;
+
+	std::string symbol_value(const symbol_t &sym) const {
+		return symbol_values.at(sym);
+	}
+
+	const generator_t * get_generator() const {
+		return generator;
+	}
+
+	const std::map<std::string, unsigned> & get_tokens() const {
+		return tokens;
+	}
+
+	codegen_t::function_t sig_alloc() const {
+		codegen_t::function_t sig(prefixed("context_t *"), prefixed("alloc"));
+		sig.add_arg("void *(*alloc_func)(size_t)", "alloc_func", true);
+
+		return sig;
+	}
+
+	codegen_t::function_t sig_free() const {
+		codegen_t::function_t sig("void", prefixed("free"));
+		sig.add_arg(prefixed("context_t *"), "parser");
+		sig.add_arg("void (*free_func)(void *)", "free_func", true);
+
+		return sig;
+	}
+
+	codegen_t::function_t sig_push() const {
+		codegen_t::function_t sig("int", prefixed("push"));
+		sig.add_arg(prefixed("context_t *"), "parser");
+		sig.add_arg("int", "token");
+		sig.add_arg("const " + prefixed("token_value_t *"), "value");
+
+		for (const auto &arg : generator->get_grammar().extra_args)
+			sig.add_arg(arg);
+
+		return sig;
+	}
+
+public:
+	output_common_t(const generator_t *generator0, const std::string &prefix0, const std::string &token_prefix0);
+};
+
+}