scanner.h

/************************************************************************
 * 
 * Compiler implementation for imperative programming language IFJ18
 * 
 * Autors:
 * Sasák Tomáš - xsasak01
 * Venkrbec Tomáš - xvenkr01
 * Krajči Martin - xkrajc21
 * Dižová Natália - xdizov00 
 * 
 ***********************************************************************/

#ifndef _SCAN_H
#define _SCAN_H

#include "str.h"
#include <stdio.h>

enum state {
		S0 = 1,		// Initial state
		S1			// State after whitespaces and comments
};

enum comment { 	
		LC = 10,	// line comment
		BC,			// block comment
		END_C,		// end of block comment	
		TMP_C,		// temporary state for BC
};

enum number { 	
		ZERO = 100,	// FS: zero
		IL,			// FS: integer literal
		FL,			// FS: floating literal
		TMP_FL,		// temporary state for FL
		TMP_F_EX,	// temporary state for FL with exponent
		TMP_I_EX,	// temporary state for IL with exponent
		SIGN_F,		// signed exponent for FL
		SIGN_I,		// signed exponent for IL
		FL_EX,		// FS: floating literal with exponent
		IL_EX		// FS: integer literal with exponent
};

enum ident { 	
		ID_STATE = 1000,	// FS: identifier
		ID_F       			// FS: function identifier
};

enum string { 	
		SL = 10000,	// FS: string literal
		TMP_SL,		// temporary state for SL
		ES,			// escape sequence
		X_ES,		// hexadecimal escape sequence \xh
		XHH_ES		// hexadecimal escape sequence \xhh
};

enum symbol {
		S_PLUS = 100000, // '+'
		S_MINUS,         // '-'
		S_ASTERISK,      // '*'
		S_SLASH,         // '/'
		S_ASSIGNMENT,    // '='
		S_EQUAL,         // '=='
		S_LT,     		// '<'
		S_LE,    		// '<='
		S_GT,  			// '>'
		S_GE, 			// '>='
		S_NE,  	  		// '!='
		S_OPEN_PARENTH,  // '('
		S_CLOSE_PARENTH, // ')'
		S_COMMA         // ','
};


/**
 * Structure which represents token
 */
typedef struct token
{
	int type; // Type of token from defines below
	union { // Union containing token data, depending on the type of token
		int i;
		double f;
		string str;
	} attr ;
}tToken;

// ======= TYPES OF TOKEN =======
#define IDF     0
#define ID      1
#define INTEGER 2
#define FLOAT   3
#define STRING  4

#define END_OF_FILE 5
#define END_OF_LINE 6
#define NORETVAL	7

// KEYWORDS
#define DEF   10
#define DO    11
#define ELSE  12
#define END   13
#define IF    14
#define NOT   15
#define NIL   16
#define THEN  17
#define WHILE 18

// OPERATORS
#define PLUS          20 // '+'
#define MINUS         21 // '-'
#define ASTERISK      22 // '*'
#define SLASH         23 // '/'
#define ASSIGNMENT    24 // '='
#define EQUAL         25 // '=='
#define LESS_THAN     26 // '<'
#define LESS_EQUAL    27 // '<='
#define GREATER_THAN  28 // '>'
#define GREATER_EQUAL 29 // '>='
#define NOT_EQUAL     30 // '!='

// SPECIAL CHARACTERS
#define OPEN_PARENTH  40 // '('
#define CLOSE_PARENTH 41 // ')'
#define COMMA         42 // ','

void set_source_file(FILE *f);
struct token get_token();
#endif // _SCAN_H