Allow adding source blocks to the top the of header and source files

src/generator.cpp

@@ -119,8 +119,10 @@ void generator_t::generate_itemsets() {
 
 generator_t::generator_t(const std::vector<std::tuple<item_t, std::vector<std::string>, std::string>> &rules0,
 			 const std::map<std::string, std::string> &nonterm_types0,
-			 const std::map<symbol_t, std::pair<std::string, std::string>> &term_types0)
-	: rules(rules0), nonterm_types(nonterm_types0), term_types(term_types0) {
+			 const std::map<symbol_t, std::pair<std::string, std::string>> &term_types0,
+			 const std::string &header_block0, const std::string &source_block0)
+	: rules(rules0), nonterm_types(nonterm_types0), term_types(term_types0),
+	  header_block(header_block0), source_block(source_block0) {
 	for (size_t i = 0; i < rules.size(); i++) {
 		item_t rule = std::get<0>(rules[i]);
 

src/generator.hpp

@@ -63,6 +63,10 @@ private:
 	std::map<std::string, std::string> nonterm_types;
 	std::map<symbol_t, std::pair<std::string, std::string>> term_types;
 
+	std::string header_block;
+	std::string source_block;
+
+
 	void close_set(std::set<item_t> *set);
 	std::set<item_t> get_set(const std::string &nonterm);
 
@@ -152,9 +156,19 @@ public:
 		return gotos;
 	}
 
+	const std::string & get_header_block() const {
+		return header_block;
+	}
+
+	const std::string & get_source_block() const {
+		return source_block;
+	}
+
+
 	generator_t(const std::vector<std::tuple<item_t, std::vector<std::string>, std::string>> &rules0,
 		    const std::map<std::string, std::string> &nonterm_types0,
-		    const std::map<symbol_t, std::pair<std::string, std::string>> &term_types0);
+		    const std::map<symbol_t, std::pair<std::string, std::string>> &term_types0,
+		    const std::string &header_block0, const std::string &source_block0);
 };
 
 }

src/lex.cpp

@@ -42,6 +42,8 @@ struct keyword_t {
 
 /* the keyword list must be sorted */
 static const keyword_t keywords[] = {
+	{"%header", TOK_HEADER},
+	{"%source", TOK_SOURCE},
 	{"%type", TOK_TYPE},
 };
 

src/output.cpp

@@ -88,6 +88,11 @@ void output_t::emit_token_value() {
 }
 
 void output_t::emit_header() {
+	std::fprintf(header_file, "#pragma once\n\n");
+
+	if (!generator->get_header_block().empty())
+		std::fprintf(header_file, "%s\n", generator->get_header_block().c_str());
+
 	emit_tokens();
 	emit_token_value();
 
@@ -261,12 +266,15 @@ void output_t::emit_header_include() {
 	const char *slash = std::strrchr(header_filename.c_str(), sep);
 	const char *basename = slash ? slash+1 : header_filename.c_str();
 
-	std::fprintf(source_file, "#include \"%s\"\n\n\n", basename);
+	std::fprintf(source_file, "#include \"%s\"\n\n", basename);
 }
 
 void output_t::emit_source() {
 	emit_header_include();
 
+	if (!generator->get_source_block().empty())
+		std::fprintf(source_file, "%s\n\n", generator->get_source_block().c_str());
+
 	std::fprintf(source_file, "typedef union %ssymbol_value {\n", prefix());
 	std::fprintf(source_file, "\t%stoken_value_t token;\n", prefix());
 

src/parser.cpp

@@ -43,6 +43,8 @@ enum parser_state {
 	STATE_TYPE_NONTERM,
 	STATE_TYPE_TERM,
 	STATE_TYPE_TERM_BLOCK,
+	STATE_HEADER,
+	STATE_SOURCE,
 };
 
 struct parser {
@@ -70,6 +72,14 @@ int parser_push(parser_t *parser, int token, const parser_value_t *value, parser
 			parser->state = STATE_TYPE;
 			return 1;
 
+		case TOK_SOURCE:
+			parser->state = STATE_SOURCE;
+			return 1;
+
+		case TOK_HEADER:
+			parser->state = STATE_HEADER;
+			return 1;
+
 		case 0:
 			return 0;
 		}
@@ -224,6 +234,25 @@ int parser_push(parser_t *parser, int token, const parser_value_t *value, parser
 			parser->state = STATE_INIT;
 			return 1;
 		}
+
+	case STATE_HEADER:
+		if (token == TOK_BLOCK) {
+			state->set_header_block(value->str);
+			free(value->str);
+			parser->state = STATE_INIT;
+			return 1;
+		}
+
+		break;
+	case STATE_SOURCE:
+		if (token == TOK_BLOCK) {
+			state->set_source_block(value->str);
+			free(value->str);
+			parser->state = STATE_INIT;
+			return 1;
+		}
+
+		break;
 	}
 
 	switch (token) {

src/parser.hpp

@@ -41,6 +41,8 @@ enum parser_token_t {
 	TOK_CHAR,
 	TOK_UINT,
 	TOK_TYPE,
+	TOK_SOURCE,
+	TOK_HEADER,
 };
 
 typedef struct parser_value {

src/parser_state.hpp

@@ -44,6 +44,9 @@ private:
 	std::string current_var;
 	std::string current_type;
 
+	std::string header_block;
+	std::string source_block;
+
 public:
 	parser_state_t() : current("") {}
 
@@ -59,6 +62,22 @@ public:
 		return term_types;
 	}
 
+	const std::string & get_header_block() const {
+		return header_block;
+	}
+
+	void set_header_block(const char *value) {
+		header_block = value;
+	}
+
+	const std::string & get_source_block() const {
+		return source_block;
+	}
+
+	void set_source_block(const char *value) {
+		source_block = value;
+	}
+
 	void new_rule(const char *nonterm);
 	void add_rule_nonterminal(const char *nonterm);
 	void add_rule_terminal(const char *term);

src/solar.cpp

@@ -87,7 +87,7 @@ int main(int argc, char *argv[]) {
 	if (!read_grammar(argv[1], &state))
 		return 1;
 
-	generator_t generator(state.get_rules(), state.get_nonterm_types(), state.get_term_types());
+	generator_t generator(state.get_rules(), state.get_nonterm_types(), state.get_term_types(), state.get_header_block(), state.get_source_block());
 
 	output_t output(&generator, argv[3], argv[2]);
 	output.write();