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%{
#include <map>
#include <cctype>
#include <cstdlib>
#include <iostream>
#include <algorithm>
#include "Log.hh"
#include "Driver.hh"
#include "Lexer.hh"
using pcc::Parser;
using pcc::Location;
namespace pcc {
char ToLower(char c){
return static_cast<char>(std::tolower(static_cast<unsigned char>(c)));
}
}
%}
%option nodefault
%option never-interactive
%option nounistd
%option case-insensitive
%option noyywrap nounput noinput batch debug
decimal ([1-9][0-9]*)|0
octal 0[0-7]*
hexadecimal 0[xX][0-9a-fA-F]
integer {decimal}|{octal}|{hexadecimal}
real_exp [0-9]*(\.[0-9]*)?[eE]{decimal}
real_noexp [0-9]*\.[0-9]*
real {real_exp}|{real_noexp}
trival_char [0-9a-zA-Z_{}[\]#()<>%:;.?*+\-/^&|~!=,\\" \t\n\v\f]
escaped_char \\[\'?\\abfnrtv]
hex_char \\x[0-9a-fA-F]{1,2}
oct_char \\[0-7]{1,3}
char_value {trival_char}|{escaped_char}|{hex_char}|{oct_char}|\\'
char '{char_value}'
string '{char_value}+'
identifier [a-z][0-9a-z_]*
white [\t\f\r ]
%{
#define YY_USER_ACTION loc.columns(yyleng);
%}
%%
%{
Location& loc = driver.location_;
loc.step();
%}
":=" {return Parser::make_ASSIGN(loc);}
":" {return Parser::make_COLON(loc);}
";" {return Parser::make_SEMICOLON(loc);}
"." {return Parser::make_DOT(loc);}
"," {return Parser::make_COMMA(loc);}
"[" {return Parser::make_LBRACKET(loc);}
"]" {return Parser::make_RBRACKET(loc);}
"(" {return Parser::make_LPARENTHESIS(loc);}
")" {return Parser::make_RPARENTHESIS(loc);}
"+" {return Parser::make_ADD(loc);}
"-" {return Parser::make_SUB(loc);}
"*" {return Parser::make_MUL(loc);}
"/" {return Parser::make_REAL_DIV(loc);}
"div" {return Parser::make_DIV(loc);}
"mod" {return Parser::make_MOD(loc);}
"^" {return Parser::make_CARET(loc);}
"@" {return Parser::make_AT(loc);}
"and" {return Parser::make_AND(loc);}
"not" {return Parser::make_NOT(loc);}
"or" {return Parser::make_OR(loc);}
"xor" {return Parser::make_XOR(loc);}
"shl" {return Parser::make_SHL(loc);}
"shr" {return Parser::make_SHR(loc);}
"<" {return Parser::make_LT(loc);}
"<=" {return Parser::make_LE(loc);}
">" {return Parser::make_GT(loc);}
">=" {return Parser::make_GE(loc);}
"=" {return Parser::make_EQ(loc);}
"<>" {return Parser::make_NE(loc);}
"begin" {return Parser::make_BEGINS(loc);}
"end" {return Parser::make_ENDS(loc);}
"program" {return Parser::make_PROGRAM(loc);}
"function" {return Parser::make_FUNCTION(loc);}
"const" {return Parser::make_CONST(loc);}
"var" {return Parser::make_VAR(loc);}
"if" {return Parser::make_IF(loc);}
"then" {return Parser::make_THEN(loc);}
"else" {return Parser::make_ELSE(loc);}
"while" {return Parser::make_WHILE(loc);}
"do" {return Parser::make_DO(loc);}
"repeat" {return Parser::make_REPEAT(loc);}
"until" {return Parser::make_UNTIL(loc);}
"break" {return Parser::make_BREAK(loc);}
"continue" {return Parser::make_CONTINUE(loc);}
"void" {return Parser::make_VOID(loc);}
"boolean" {return Parser::make_BOOLEAN(loc);}
"char" {return Parser::make_CHAR(loc);}
"integer" {return Parser::make_INTEGER(loc);}
"real" {return Parser::make_REAL(loc);}
"string" {return Parser::make_STRING(loc);}
"true" {return Parser::make_BOOLEAN_LITERAL(true, loc);}
"false" {return Parser::make_BOOLEAN_LITERAL(false, loc);}
{integer} {
int number = std::strtol(yytext, NULL, 0);
return Parser::make_INTEGER_LITERAL(number, loc);
}
{real} {
float number = std::strtof(yytext, NULL);
return Parser::make_REAL_LITERAL(number, loc);
}
{char} {
char *s, *end, c;
s = yytext + 1;
end = s + yyleng - 2;
pcc::Lexer::GetUnescapedChar(s, end, &c);
return Parser::make_CHAR_LITERAL(c, loc);
}
{string} {
char *s, *end, *p;
s = p = yytext + 1;
end = s + yyleng - 2;
while (s < end) {
s = pcc::Lexer::GetUnescapedChar(s, end, p);
p++;
}
*p++ = '\0';
return Parser::make_STRING_LITERAL(std::vector<char>(yytext + 1, p), loc);
}
{identifier} {
char *name = new char[yyleng];
std::transform(yytext, yytext+yyleng, name, pcc::ToLower);
return Parser::make_IDENTIFIER(yytext, loc);
}
{white}+ {loc.step();}
\n+ {loc.lines(yyleng); loc.step();}
. {
std::cerr<<"ERROR";
}
<<EOF>> {return Parser::make_FILE_END(loc);}
%%
namespace pcc {
int Driver::StartLexer(std::string& filename) {
yy_flex_debug = (CurrentLogLevel==LogLevel::PCC_DEBUG);
yyin = std::fopen(filename.c_str(), "r");
if (yyin == NULL) {
Log(LogLevel::PCC_ERROR, "Failed to open file %s", filename.c_str());
return -1;
}
return 0;
}
void Driver::StopLexer() { std::fclose(yyin); }
} // namespace pcc
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