CODE:

%{
	#include 
	#include 
	#include "basic_basic_bison.h"
	#pragma warning(disable:4996)

//	extern YYLTYPE yylloc;
%}


nonzero		[1-9]
digit		[[:digit:]]
wspace		[[:blank:]]
alpha		[[:alpha:]]
alnum		[[:alnum:]]
integer		({nonzero}{digit}*)|0
variable	[_[:alpha:]][_[:alnum:]]*




%%


{integer} {
	printf("flex info : found integer\n");
	/*
	next_location();
	yylloc.last_column += yyleng;
	yylval = atof(yytext);
	//*/
	return num_literal_token;
}

{variable} {
	printf("flex info : found variable\n");
	/*
	next_location();
	yylloc.last_column += yyleng;
	//*/
	return variable_token;
}


= {
	printf("flex info : found '='\n");
	/*
	next_location();
	yylloc.last_column += 1;
	//*/
	return '=';
}

\+ {
	printf("flex info : found '+'\n");
	/*
	next_location();
	yylloc.last_column += 1;
	//*/
	return '+';
}

- {
	printf("flex info : found '-'\n");
	/*
	next_location();
	yylloc.last_column += 1;
	//*/
	return '-';
}

\* {
	printf("flex info : found '*'\n");
	/*
	next_location();
	yylloc.last_column += 1;
	//*/
	return '*';
}

\/ {
	printf("flex info : found '/'\n");
	/*
	next_location();
	yylloc.last_column += 1;
	//*/
	return '/';
}

; {
	printf("flex info : found ';'\n");
	/*
	next_location();
	yylloc.last_column += 1;
	//*/
	return ';';
}


> {
	printf("\n\ncompile completed!\n");
	return 0;
}



%%


int yywrap(void)
{
	return 1;
}

int main(void)
{
  /* 構文解析関数 yyparse */
  yyin = fopen("testcode.txt", "r");
  yyparse();
  getchar();
  return 0;
}

CODE:

%defines

%{

#include 
#include 
#include 

//#define YYSTYPE double

void yyerror(const char* s);
int yylex(void);

%}

%token num_literal_token
%token variable_token

%%


input   :				{ printf("bison info : found input\n"); }
        | input line	{ printf("bison info : found input\n"); }
;



line	: formula ';'		{ printf("bison info : found line\n"); }
		| ';'				{ printf("bison info : found line\n"); }
		| error ';'			{ printf("bison error : wrong formula\n"); }
;

formula	: variable_token '=' formula		{ printf("bison info : found formula\n"); }
		| num_literal_token '=' formula		{ printf("bison error : left-hand side must variable\n"); }
		| formula binary_operator formula	{ printf("bison info : found formula\n"); }
		| variable_token					{ printf("bison info : found formula\n"); }
		| num_literal_token					{ printf("bison info : found formula\n"); }
;

binary_operator : '+'	{ printf("bison info : found binary_operator\n"); }
				| '-'	{ printf("bison info : found binary_operator\n"); }
				| '*'	{ printf("bison info : found binary_operator\n"); }
				| '/'	{ printf("bison info : found binary_operator\n"); }
;




%%


/* エラー表示関数 */
void yyerror(const char* s)
{
  printf("bison:error=> %s\n", s);
}

CODE:

3+;
3=var;