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gpp_lexer.l
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gpp_lexer.l
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;* 161044105 HALİL İBRAHİM KÖSE *
#include <ctype.h>
%{
int EXIT = 0;
%}
keywords("and"|"or"|"not"|"equal"|"less"|"nil"|"list"|"append"|"concat"|"set"|"deffun"|"for"|"if"|"exit"|"load"|"disp"|"true"|"false")
value_zero([ 0 ])
value([1-9][0-9]*)
id([a-zA-Z][a-zA-Z0-9]*" "*)
operators("+"|"-"|"/"|"*"|"("|")"|"**"|",")
/*** Rule Section has three rules ***/
%%
"+" {printf("OP_PLUS\n");}
"-" {printf("OP_MINUS\n");}
"/" {printf("OP_DIV\n");}
"*" {printf("OP_MULT\n");}
"(" {printf("OP_OP\n");}
")" {printf("OP_CP\n");}
"\"" {printf("OP_CO\n");}
"**" {printf("OP_DBLMULT\n");}
"," {printf("OP_COMMA\n");}
"“" {printf("OP_CO\n");}
"”" {printf("OP_CC\n");}
;;.* {printf("COMMENT\n");}
{keywords}" "+ {printf("KW_");
if(!(strncmp(yytext, "exit", 4)))
EXIT = 1;
while(yytext[0])
printf("%c", yytext++[0]-32);
printf("\n");
if(EXIT){
printf("EXIT\n");
return 0;
}}
{id} {
printf("IDENTIFIER\n");
}
{value} {
printf("VALUE\n");
}
{value_zero}
{
printf("VALUE\n");
}
[ \t\n]+ {}
{value}{id} {
printf("SYNTAX_ERROR %s\n", yytext);
}
. {
printf("SYNTAX_ERROR %s\n", yytext);
}
<<EOF>> {return 0;}
%%
int yywrap(){}
int main(){
yylex();
return 0;
}