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scanner.l
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%{
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "y.tab.h"
int line_number = 1;
char* _NEW_LINE = "\n";
char* _TAB = "\t";
char* _BSLASH = "\\";
char* _SINGLE_QUOTE = "\'";
char tmp[2];
char* remove_single_quote(char* s) {
if (s[2] == '\'') {
memcpy(tmp, &s[1], 1);
tmp[1] = '\0';
return tmp;
} else if (s[2] == 'n') {
return _NEW_LINE;
} else if (s[2] == 't') {
return _TAB;
} else if (s[2] == '\\') {
return _BSLASH;
} else {
return _SINGLE_QUOTE;
}
}
%}
Keywords "void"|"const"|"NULL"|"for"|"do"|"while"|"break"|"continue"|"if"|"else"|"return"|"struct"|"switch"|"case"|"default"|"int"|"double"|"float"|"char"|"fclose"|"clearerr"|"feof"|"ferror"|"fflush"|"fgetpos"|"fopen"|"fread"|"freopen"|"fseek"|"fsetpos"|"ftell"|"fwrite"|"remove"|"rename"|"rewind"|"setbuf"|"setvbuf"|"tmpfile"|"tmpnam"|"fprintf"|"printf"|"sprintf"|"vfprintf"|"vprintf"|"vsprintf"|"fscanf"|"scanf"|"sscanf"|"fgetc"|"fgets"|"fputc"|"fputs"|"getc"|"getchar"|"gets"|"putc"|"putchar"|"puts"|"ungetc"|"perror"
Operators "+"|"-"|"*"|"/"|"%"|"++"|"--"|"<"|"<="|">"|">="|"=="|"!="|"="|"&&"|"||"|"!"|"&"|"|"
PuncChars ":"|";"|","|"."|"["|"]"|"("|")"|"{"|"}"
Space " "|"\t"
%x COMMENT
%%
\n {++line_number;}
{Space} {}
"void" {yylval.sval = strdup(yytext); return TYPE_VOID;}
"int" {yylval.sval = strdup(yytext); return TYPE_INT;}
"double" {yylval.sval = strdup(yytext); return TYPE_DOUBLE;}
"float" {yylval.sval = strdup(yytext); return TYPE_FLOAT;}
"char" {yylval.sval = strdup(yytext); return TYPE_CHAR;}
"=" {return ASSIGN;}
"," {return COMMA;}
":" {return COLON;}
[0-9]+ {yylval.ival = atoi(yytext); return INT;}
("."[0-9]+|[0-9]+"."|[0-9]+"."[0-9]+) {yylval.dval = atof(yytext); return DOUBLE;}
\'(\\.|[^\n'\\])\' {yylval.sval = remove_single_quote(strdup(yytext)); return CHAR;}
\"(\\.|[^\n"\\])*\" {yylval.sval = strdup(yytext); return STRING;}
"const" {return CONST;}
"if" {return IF;}
"else" {return ELSE;}
"switch" {return SWITCH;}
"case" {return CASE;}
"default" {return DEFAULT;}
"do" {return DO;}
"while" {return WHILE;}
"for" {return FOR;}
"return" {return RETURN;}
"break" {return BREAK;}
"continue" {return CONTINUE;}
"<" {return LESS;}
"<=" {return LESS_EQUAL;}
">" {return GREATER;}
">=" {return GREATER_EQUAL;}
"==" {return EQUAL;}
"!=" {return NOT_EQUAL;}
"+" {return PLUS;}
"-" {return MINUS;}
"++" {return INCREMENT;}
"--" {return DECREMENT;}
"!" {return NOT;}
"*" {return MULTIPLY;}
"/" {return DIVIDE;}
"%" {return MODULO;}
"&&" {return AND;}
"||" {return OR;}
"&" {return OP_AND;}
"|" {return OP_OR;}
"(" {return L_BRACKET;}
")" {return R_BRACKET;}
"[" {return L_SQR_BRACKET;}
"]" {return R_SQR_BRACKET;}
"{" {return L_PARENTHESIS;}
"}" {return R_PARENTHESIS;}
";" {return EOL;}
(_|[a-zA-Z])(_|[a-zA-Z]|[0-9])* {yylval.sval = strdup(yytext); return IDENT;}
%%
/*
{Space} {if (strcmp(yytext, " ") == 0) {concat(space);} else {concat(tab);}}
\n {print_src();}
{Keywords} {printf("#token key:%s\n", yytext); concat(yytext);}
{Operators} {printf("#token op:%s\n", yytext); concat(yytext);}
{PuncChars} {printf("#token punc:%s\n", yytext); concat(yytext);}
\"(\\.|[^\n"\\])*\" {printf("#token string:%s\n", yytext); concat(yytext);}
*/