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scanner.c
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scanner.c
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/**
* Project: IFJ21 imperative language compiler
*
* Brief: Lexical Analysis for IFJ21 compiler
*
* Author: Adam Kankovsky <xkanko00>
* Author: Stepan Bakaj <xbakaj00>
* Author: Radek Serejch <xserej00>
* Author: David Chocholaty <xchoch09>
*
*/
#include <ctype.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "scanner.h"
#include "string.h"
#include "error.h"
#define ASCII_PRINTABLE 32
#define ASCII_NUMS_START 48
error_t err;
void set_id_keyword (token_t* token, char* str){
if(strcmp(str,"do") == 0){
token->attribute.keyword = K_DO;
token->type = T_KEYWORD;
}else if(strcmp(str,"else") == 0){
token->attribute.keyword = K_ELSE;
token->type = T_KEYWORD;
}else if(strcmp(str,"end") == 0){
token->attribute.keyword = K_END;
token->type = T_KEYWORD;
}else if(strcmp(str,"function") == 0){
token->attribute.keyword = K_FUNCTION;
token->type = T_KEYWORD;
}else if(strcmp(str,"global") == 0){
token->attribute.keyword = K_GLOBAL;
token->type = T_KEYWORD;
}else if(strcmp(str,"if") == 0){
token->attribute.keyword = K_IF;
token->type = T_KEYWORD;
}else if(strcmp(str,"integer") == 0){
token->attribute.keyword = K_INTEGER;
token->type = T_KEYWORD;
}else if(strcmp(str,"local") == 0){
token->attribute.keyword = K_LOCAL;
token->type = T_KEYWORD;
}else if(strcmp(str,"nil") == 0){
token->attribute.keyword = K_NIL;
token->type = T_KEYWORD;
}else if(strcmp(str,"number") == 0){
token->attribute.keyword = K_NUMBER;
token->type = T_KEYWORD;
}else if(strcmp(str,"require") == 0){
token->attribute.keyword = K_REQUIRE;
token->type = T_KEYWORD;
}else if(strcmp(str,"return") == 0){
token->attribute.keyword = K_RETURN;
token->type = T_KEYWORD;
}else if(strcmp(str,"string") == 0){
token->attribute.keyword = K_STRING;
token->type = T_KEYWORD;
}else if(strcmp(str,"then") == 0){
token->attribute.keyword = K_THEN;
token->type = T_KEYWORD;
}else if(strcmp(str,"while") == 0){
token->attribute.keyword = K_WHILE;
token->type = T_KEYWORD;
}else{
token->type = T_IDENTIFIER;
}
}
token_t* create_token ()
{
return (token_t*) malloc(sizeof(token_t));
}
void delete_token (token_t* token)
{
if (token != NULL)
{
if (token->type == T_IDENTIFIER ||
token->type == T_STRING)
{
free(token->attribute.string);
token->attribute.string = NULL;
}
}
free(token);
token = NULL;
}
token_t* get_next_token ()
{
char symbol;
token_t* token;
string_ptr_t str = NULL;
state_t state = S_INIT;
bool f_state = true;
err = E_NO_ERR;
token = create_token();
if (!token)
{
err = E_INTERNAL;
return NULL;
}
if ((str = string_init()) == NULL)
{
err = E_INTERNAL;
delete_token(token);
return NULL;
}
while ((symbol = (char)getc(stdin)) != EOF)
{
switch (state)
{
//**************** INIT STATE ****************//
case (S_INIT):
if (symbol == '#')
{
token->type = T_CHAR_CNT;
string_free(str);
return token;
}
else if (symbol == '*')
{
token->type = T_MUL;
string_free(str);
return token;
}
else if (symbol == '/')
{
state = S_DIV;
}
else if (symbol == '+')
{
token->type = T_PLUS;
string_free(str);
return token;
}
else if (symbol == '-')
{
state = S_MINUS;
}
else if (symbol == '.')
{
f_state = false;
state = S_DOT;
}
else if (symbol == '<')
{
state = S_LESS_THAN;
}
else if (symbol == '>')
{
state = S_GTR_THAN;
}
else if (symbol == '~')
{
f_state = false;
state = S_TILDE;
}
else if (symbol == '=')
{
state = S_ASSIGN;
}
else if (symbol == ':')
{
token->type = T_COLON;
string_free(str);
return token;
}
else if (symbol == '(')
{
token->type = T_LEFT_BRACKET;
string_free(str);
return token;
}
else if (symbol == ')')
{
token->type = T_RIGHT_BRACKET;
string_free(str);
return token;
}
else if (symbol == ',')
{
token->type = T_COMMA;
string_free(str);
return token;
}
else if (isdigit(symbol))
{
state = S_INT;
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
}
else if (isalpha(symbol) || symbol == '_')
{
state = S_IDENTIFIER_KEYWORD;
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
}
else if (symbol == '"')
{
f_state = false;
state = S_STRING_CONTENT;
}
else if (symbol != '\n' && symbol != '\t' && symbol != ' ')
{
err = E_LEX;
delete_token(token);
string_free(str);
return NULL;
}
break;
//***************** Q STATES *****************//
case (S_ONE_LINE_COMMENT):
if (symbol == '[')
{
state = S_LEFT_SQUARE_BRACKET;
}
else
{
state = S_ONE_LINE_COMMENT_CONTENT;
}
break;
case (S_ONE_LINE_COMMENT_CONTENT):
if (symbol == '\n')
{
f_state = true;
state = S_INIT;
}
break;
case (S_LEFT_SQUARE_BRACKET):
if (symbol == '[')
{
state = S_BLOCK_COMMENT_CONTENT;
}
else
{
state = S_ONE_LINE_COMMENT_CONTENT;
}
break;
case (S_BLOCK_COMMENT_CONTENT):
if (symbol == ']')
{
state = S_RIGHT_SQUARE_BRACKET;
}
break;
case (S_RIGHT_SQUARE_BRACKET):
if (symbol == ']')
{
state = S_INIT;
}
else
{
state = S_BLOCK_COMMENT_CONTENT;
}
break;
case (S_DOT):
if (symbol == '.')
{
token->type = T_CONCAT;
string_free(str);
return token;
}
else
{
err = E_LEX;
delete_token(token);
string_free(str);
return NULL;
}
break;
case (S_TILDE):
if (symbol == '=')
{
token->type = T_NOT_EQ;
string_free(str);
return token;
}
else
{
err = E_LEX;
delete_token(token);
string_free(str);
return NULL;
}
break;
case (S_DECIMAL_POINT):
if (isdigit(symbol))
{
f_state = true;
state = S_DECIMAL;
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
}
else
{
err = E_LEX;
delete_token(token);
string_free(str);
return NULL;
}
break;
case (S_EXP):
if (symbol == '+' || symbol == '-')
{
state = S_EXP_PLUS_MINUS;
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
}
else if(isdigit(symbol))
{
f_state = true;
state = S_DECIMAL_W_EXP;
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
}
else
{
err = E_LEX;
delete_token(token);
string_free(str);
return NULL;
}
break;
case (S_EXP_PLUS_MINUS):
if (isdigit(symbol))
{
f_state = true;
state = S_DECIMAL_W_EXP;
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
}
else
{
err = E_LEX;
delete_token(token);
string_free(str);
return NULL;
}
break;
case (S_STRING_CONTENT):
if (symbol == '"')
{
token->type = T_STRING;
if (str->lenght != 0)
{
token->attribute.string = (char*) malloc(strlen(get_char_arr(str))+1);
if (token->attribute.string == NULL)
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
strcpy(token->attribute.string, get_char_arr(str));
string_free(str);
}
else
{
token->attribute.string = (char*) malloc(1);
strcpy(token->attribute.string, "");
}
return token;
}
else if (symbol == '\\')
{
state = S_ESC_SEQ_BACKSLASH;
}
else if((int)symbol < ASCII_PRINTABLE)
{
err = E_LEX;
delete_token(token);
string_free(str);
return NULL;
}
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
break;
case (S_ESC_SEQ_BACKSLASH):
if (symbol == '0')
{
state = S_ESC_SEQ_ZERO;
}
else if (symbol == '1')
{
state = S_ESC_SEQ_ONE;
}
else if (symbol == '2')
{
state = S_ESC_SEQ_TWO;
}
else if (symbol == '"' || symbol == 'n' ||
symbol == 't' || symbol == '\\')
{
state = S_STRING_CONTENT;
}
else
{
err = E_LEX;
delete_token(token);
string_free(str);
return NULL;
}
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
break;
case (S_ESC_SEQ_ZERO):
if (symbol == '0')
{
state = S_ESC_SEQ_DOUBLE_ZERO;
}
else if (isdigit(symbol))
{
state = S_ESC_SEQ_X_X;
}
else
{
err = E_LEX;
delete_token(token);
string_free(str);
return NULL;
}
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
break;
case (S_ESC_SEQ_DOUBLE_ZERO):
if (isdigit(symbol) && symbol != '0')
{
state = S_STRING_CONTENT;
}
else
{
err = E_LEX;
delete_token(token);
string_free(str);
return NULL;
}
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
break;
case (S_ESC_SEQ_ONE):
if (isdigit(symbol))
{
state = S_ESC_SEQ_X_X;
}
else
{
err = E_LEX;
delete_token(token);
string_free(str);
return NULL;
}
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
break;
case (S_ESC_SEQ_X_X):
if (isdigit(symbol))
{
state = S_STRING_CONTENT;
}
else
{
err = E_LEX;
delete_token(token);
string_free(str);
return NULL;
}
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
break;
case (S_ESC_SEQ_TWO):
if (symbol == '5')
{
state = S_ESC_SEQ_TWO_FIVE;
}
else if (isdigit(symbol) &&
((int)symbol - ASCII_NUMS_START) < 5)
{
state = S_ESC_SEQ_X_X;
}
else
{
err = E_LEX;
delete_token(token);
string_free(str);
return NULL;
}
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
break;
case (S_ESC_SEQ_TWO_FIVE):
if (isdigit(symbol) &&
((int)symbol - ASCII_NUMS_START) <= 5)
{
state = S_STRING_CONTENT;
}
else
{
err = E_LEX;
delete_token(token);
string_free(str);
return NULL;
}
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
break;
//***************** F STATES *****************//
case (S_DIV):
if (symbol == '/')
{
token->type = T_INT_DIV;
string_free(str);
return token;
}
else
{
if (ungetc(symbol, stdin) == EOF)
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
token->type = T_DIV;
string_free(str);
return token;
}
break;
case (S_MINUS):
if (symbol == '-')
{
f_state = false;
state = S_ONE_LINE_COMMENT;
}
else
{
if (ungetc(symbol, stdin) == EOF)
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
token->type = T_MINUS;
string_free(str);
return token;
}
break;
case (S_LESS_THAN):
if (symbol == '=')
{
token->type = T_LESS_EQ;
string_free(str);
return token;
}
else
{
if (ungetc(symbol, stdin) == EOF)
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
token->type = T_LESS_THAN;
string_free(str);
return token;
}
break;
case (S_GTR_THAN):
if (symbol == '=')
{
token->type = T_GTR_EQ;
string_free(str);
return token;
}
else
{
if (ungetc(symbol, stdin) == EOF)
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
token->type = T_GTR_THAN;
string_free(str);
return token;
}
break;
case (S_ASSIGN):
if (symbol == '=')
{
token->type = T_EQ;
string_free(str);
return token;
}
else
{
if (ungetc(symbol, stdin) == EOF)
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
token->type = T_ASSIGN;
string_free(str);
return token;
}
break;
case (S_INT):
if (symbol == 'e' || symbol == 'E')
{
f_state = false;
state = S_EXP;
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
}
else if (symbol == '.')
{
f_state = false;
state = S_DECIMAL_POINT;
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
}
else if (isdigit(symbol))
{
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
}
else
{
if (ungetc(symbol, stdin) == EOF)
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
token->type = T_INT;
token->attribute.integer = string_to_int(str);
string_free(str);
return token;
}
break;
case (S_DECIMAL):
if (symbol == 'e' || symbol == 'E')
{
f_state = false;
state = S_EXP;
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
}
else if (isdigit(symbol))
{
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
}
else
{
if (ungetc(symbol, stdin) == EOF)
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
token->type = T_DECIMAL;
token->attribute.decimal = string_to_dec(str);
string_free(str);
return token;
}
break;
case (S_IDENTIFIER_KEYWORD):
if (isalpha(symbol) || isdigit(symbol) || symbol == '_')
{
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
}
else
{
if (ungetc(symbol, stdin) == EOF)
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
char* id_keyword = get_char_arr(str);
set_id_keyword(token, id_keyword);
if (token->type == T_IDENTIFIER)
{
token->attribute.string = (char*) malloc(strlen(get_char_arr(str))+1);
if (token->attribute.string == NULL)
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
strcpy(token->attribute.string, get_char_arr(str));
}
string_free(str);
return token;
}
break;
case (S_DECIMAL_W_EXP):
if (isdigit(symbol))
{
if (!string_append_character(str, symbol))
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}
}
else
{
if (ungetc(symbol, stdin) == EOF)
{
err = E_INTERNAL;
delete_token(token);
string_free(str);
return NULL;
}