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lexical.l
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%option noyywrap c++ yylineno
%{
#include <cstdlib>
#include <iostream>
#include <sstream>
#include "Parserbase.h"
#define DEBUG true
void print_debug_message(std::string message) {
if(DEBUG) {
std::cout << "[DEBUG] " << message << std::endl;
}
}
void print_error_message(std::string message) {
std::cerr << "[ERROR] " << message << std::endl;
}
%}
LOWER_CASE_LETTER [a-z]
DIGIT [0-9]
LEFT_BRACKET [(]
RIGHT_BRACKET [)]
WHITEPACE [ \t\n]
COMMENT_INDICATOR \*
END_STATEMENT_CHARACTER \.
PROGRAM_KEYWORD PROGRAM
DATA_KEYWORD DATA
DATA_SUFIX :
DATA_SEPARATOR ,
TYPE_KEYWORD TYPE
TYPE_KEYWORD_I I
TYPE_I_IDENTIFIER {DIGIT}+
TYPE_KEYWORD_B B
TYPE_KEYWORD_B_TRUE TRUE
TYPE_KEYWORD_B_FALSE FALSE
TYPE_KEYWORD_S S
COMMENT ^{COMMENT_INDICATOR}.*
IDENTIFIER {LOWER_CASE_LETTER}({LOWER_CASE_LETTER}|{DIGIT}|_)*
WHILE_KEYWORD WHILE
ENDWHILE_KEYWORD ENDWHILE
IF_KEYWORD IF
ELSE_KEYWORD ELSE
ENDIF_KEYWORD ENDIF
AND_KEYWORD AND
OR_KEYWORD OR
NOT_KEYWORD NOT
EQUAL_KEYWORD =
LESSER_THAN_KEYWORD <
GREATER_THAN_KEYWORD >
TO_KEYWORD TO
BY_KEYWORD BY
FROM_KEYWORD FROM
READ_KEYWORD READ
WRITE_KEYWORD WRITE
MOVE_KEYWORD MOVE
ADD_KEYWORD ADD
SUBTRACT_KEYWORD SUBTRACT
MULTIPLY_KEYWORD MULTIPLY
DIVIDE_KEYWORD DIVIDE
MOD_KEYWORD MOD
CONCAT_KEYWORD CONCAT
LENGTH_KEYWORD length
STRING_LITERAL \"[^\"\n]*\"
%%
{COMMENT} {
// Skip comment
std::string current_text = YYText();
print_debug_message("Comment: " + current_text);
}
{END_STATEMENT_CHARACTER}$ {
print_debug_message("Lexer read: END_STATEMENT");
return Parser::END_STATEMENT;
}
{PROGRAM_KEYWORD} {
print_debug_message("Lexer read: PROGRAM");
return Parser::PROGRAM;
}
{DATA_KEYWORD} {
print_debug_message("Lexer read: DATA");
return Parser::DATA;
}
{DATA_SUFIX} {
print_debug_message("Lexer read: DATA_SUFIX");
return Parser::DATA_SUFIX;
}
{DATA_SEPARATOR} {
print_debug_message("Lexer read: DATA_SEPARATOR");
return Parser::DATA_SEPARATOR;
}
{TYPE_KEYWORD} {
print_debug_message("Lexer read: TYPE");
return Parser::TYPE;
}
{TYPE_KEYWORD_I} {
print_debug_message("Lexer read: TYPE_I");
return Parser::TYPE_I;
}
{TYPE_KEYWORD_B} {
print_debug_message("Lexer read: TYPE_B");
return Parser::TYPE_B;
}
{TYPE_KEYWORD_S} {
print_debug_message("Lexer read: TYPE_S");
return Parser::TYPE_S;
}
{WHILE_KEYWORD} {
print_debug_message("Lexer read: WHILE");
return Parser::WHILE;
}
{ENDWHILE_KEYWORD} {
print_debug_message("Lexer read: ENDWHILE");
return Parser::ENDWHILE;
}
{IF_KEYWORD} {
print_debug_message("Lexer read: IF");
return Parser::IF;
}
{ELSE_KEYWORD} {
print_debug_message("Lexer read: ELSE");
return Parser::ELSE;
}
{ENDIF_KEYWORD} {
print_debug_message("Lexer read: ENDIF");
return Parser::ENDIF;
}
{EQUAL_KEYWORD} {
print_debug_message("Lexer read: EQUAL");
return Parser::EQUAL;
}
{LESSER_THAN_KEYWORD} {
print_debug_message("Lexer read: LESSER_THAN");
return Parser::LESSER_THAN;
}
{GREATER_THAN_KEYWORD} {
print_debug_message("Lexer read: GREATER_THAN");
return Parser::GREATER_THAN;
}
{AND_KEYWORD} {
print_debug_message("Lexer read: AND");
return Parser::AND;
}
{OR_KEYWORD} {
print_debug_message("Lexer read: OR");
return Parser::OR;
}
{NOT_KEYWORD} {
print_debug_message("Lexer read: NOT");
return Parser::NOT;
}
{TO_KEYWORD} {
print_debug_message("Lexer read: TO");
return Parser::TO;
}
{BY_KEYWORD} {
print_debug_message("Lexer read: BY");
return Parser::BY;
}
{FROM_KEYWORD} {
print_debug_message("Lexer read: FROM");
return Parser::FROM;
}
{READ_KEYWORD} {
print_debug_message("Lexer read: READ");
return Parser::READ;
}
{WRITE_KEYWORD} {
print_debug_message("Lexer read: WRITE");
return Parser::WRITE;
}
{MOVE_KEYWORD} {
print_debug_message("Lexer read: MOVE");
return Parser::MOVE;
}
{ADD_KEYWORD} {
print_debug_message("Lexer read: ADD");
return Parser::ADD;
}
{SUBTRACT_KEYWORD} {
print_debug_message("Lexer read: SUBTRACT");
return Parser::SUBTRACT;
}
{MULTIPLY_KEYWORD} {
print_debug_message("Lexer read: MULTIPLY");
return Parser::MULTIPLY;
}
{DIVIDE_KEYWORD} {
print_debug_message("Lexer read: DIVIDE");
return Parser::DIVIDE;
}
{MOD_KEYWORD} {
print_debug_message("Lexer read: MOD");
return Parser::MOD;
}
{CONCAT_KEYWORD} {
print_debug_message("Lexer read: CONCAT");
return Parser::CONCAT;
}
{LENGTH_KEYWORD} {
print_debug_message("Lexer read: LENGTH");
return Parser::LENGTH;
}
{TYPE_I_IDENTIFIER} {
std::string current_text = YYText();
print_debug_message("Lexer read: IDENTIFIER_I: " + current_text);
return Parser::IDENTIFIER_I;
}
{TYPE_KEYWORD_B_TRUE} {
print_debug_message("Lexer read: IDENTIFIER_B_TRUE");
return Parser::IDENTIFIER_B_TRUE;
}
{TYPE_KEYWORD_B_FALSE} {
print_debug_message("Lexer read: IDENTIFIER_B_FALSE");
return Parser::IDENTIFIER_B_FALSE;
}
{LEFT_BRACKET} {
print_debug_message("Lexer read: LEFT_BRACKET");
return Parser::LEFT_BRACKET;
}
{RIGHT_BRACKET} {
print_debug_message("Lexer read: RIGHT_BRACKET");
return Parser::RIGHT_BRACKET;
}
{IDENTIFIER} {
std::string current_text = YYText();
print_debug_message("Lexer read: IDENTIFIER: " + current_text);
return Parser::IDENTIFIER;
}
{STRING_LITERAL} {
std::string current_text = YYText();
print_debug_message("Lexer read: STRING_LITERAL: " + current_text);
return Parser::STRING_LITERAL;
}
{WHITEPACE}+ {
// Skip whitespaces
//print_debug_message("Whitespace skipped.");
}
. {
std::stringstream ss;
ss << "Lexical error at line: " << lineno();
print_error_message(ss.str());
exit(1);
}
%%