ZMemory/meta_src/scanner.l

%{

#include <stdio.h>

#define  p(f)    (fprintf(f, "%s", yytext));
#define ps(f, s) (fprintf(f, s));

FILE* code_common = NULL;
FILE* code_g = NULL;
FILE* code_w = NULL;
FILE* interface_common = NULL;
FILE* interface_w = NULL;
FILE* interface_g = NULL;

%}

%option noyywrap

%x LEX_STATE_EXPORT_COMMON
%x LEX_STATE_EXPORT_SPLIT
%x LEX_STATE_EXPORT_SPLIT_FUNCTION
%x LEX_STATE_EXPORT_SPLIT_FUNCTION_BODY
%x LEX_STATE_EXPORT_OPTION
%x LEX_STATE_EXPORT_OPTION_2

%%

<INITIAL>.  p(code_common);
<INITIAL>\n p(code_common);

<INITIAL>"$export_common " BEGIN(LEX_STATE_EXPORT_COMMON);
<INITIAL>"$$export_split " BEGIN(LEX_STATE_EXPORT_SPLIT);
<INITIAL>"$$export_split"  BEGIN(LEX_STATE_EXPORT_SPLIT);
<INITIAL>"$export_option " printf("Exporting an option.\n"); BEGIN(LEX_STATE_EXPORT_OPTION);

<LEX_STATE_EXPORT_COMMON>.  p(code_common); p(interface_common);
<LEX_STATE_EXPORT_COMMON>\n p(code_common); p(interface_common); BEGIN(INITIAL);

<LEX_STATE_EXPORT_SPLIT>"function"   p(code_g); p(code_w); p(interface_g); p(interface_w); BEGIN(LEX_STATE_EXPORT_SPLIT_FUNCTION);
<LEX_STATE_EXPORT_SPLIT>"@" ps(code_g,"g"); ps(code_w,"w"); ps(interface_g,"g"); ps(interface_w,"w");
<LEX_STATE_EXPORT_SPLIT>"$$" BEGIN(INITIAL);
<LEX_STATE_EXPORT_SPLIT>(.|\n) p(code_g); p(code_w); p(interface_g); p(interface_w);

<LEX_STATE_EXPORT_SPLIT_FUNCTION>"{" p(code_g); p(code_w); ps(interface_g, "{return 0;}\n"); ps(interface_w, "{return 0;}\n"); BEGIN(LEX_STATE_EXPORT_SPLIT_FUNCTION_BODY);
<LEX_STATE_EXPORT_SPLIT_FUNCTION>"@" ps(code_g,"g"); ps(code_w,"w"); ps(interface_g,"g"); ps(interface_w,"w");
<LEX_STATE_EXPORT_SPLIT_FUNCTION>(.|\n) p(code_g); p(code_w); p(interface_g); p(interface_w);
<LEX_STATE_EXPORT_SPLIT_FUNCTION_BODY>"@" ps(code_g,"g"); ps(code_w,"w");
<LEX_STATE_EXPORT_SPLIT_FUNCTION_BODY>"$$" BEGIN(INITIAL);
<LEX_STATE_EXPORT_SPLIT_FUNCTION_BODY>(.|\n) p(code_g); p(code_w);

<LEX_STATE_EXPORT_OPTION>"$" BEGIN(LEX_STATE_EXPORT_OPTION_2);
<LEX_STATE_EXPORT_OPTION>(.|\n) p(code_g); p(interface_g);
<LEX_STATE_EXPORT_OPTION_2>"$" BEGIN(INITIAL);
<LEX_STATE_EXPORT_OPTION_2>(.|\n) p(code_w); p(interface_w);


%%

int main(int argn, char** argv)
{
	if(argn < 7)
	{
		printf("Give output file as argument.\n");
		return 1;
	}

	code_common = fopen(argv[1], "w");
	code_g = fopen(argv[2], "w");
	code_w = fopen(argv[3], "w");
	interface_common = fopen(argv[4], "w");
	interface_g = fopen(argv[5], "w");
	interface_w = fopen(argv[6], "w");

	yylex();

	fclose(code_common);
	fclose(code_g);
	fclose(code_w);
	fclose(interface_common);
	fclose(interface_g);
	fclose(interface_w);

	return 0;
}