CompilerHW3/compiler_hw3.l at main · Howeng98/CompilerHW3 · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
/* Definition section */
%{
    #include "common.h"
    #include "y.tab.h"	/* header file generated by bison */
    extern YYSTYPE yylval;

    #define YY_NO_UNPUT
    #define YY_NO_INPUT
    char var_name[50];
%}


/* Define regular expression label */
letter  [a-zA-Z_]
digit [0-9]
id {letter}+({letter}|{digit})*
inumber {digit}+
fnumber ({digit}*\.{digit}+)
newline [\n]

%x CMT
%x STR
%option yylineno

/* Rules section */
%%

"/*"        { BEGIN(CMT); }
<CMT>"*/"   { BEGIN(INITIAL); }
<CMT>\n     {;}
<CMT>.      {;}
"//".*      {;}
"\""        { BEGIN(STR);
                return '"';
            }
<STR>"\""   { BEGIN(INITIAL);
                return '"';
            }
"\"".*"\"" {    yytext = yytext + 1;
                yytext[strlen(yytext)-1] = '\0';
                yylval.s_val = strdup(yytext);
                return STRING_LIT;
            }

"+"          { return ADD; }
"-"          { return SUB; }
"*"          { return MUL; }
"/"          { return QUO; }
"%"          { return REM; }
"++"         { return INC; }
"--"         { return DEC; }

">"          { return GTR; }
"<"          { return LSS; }
">="         { return GEQ; }
"<="         { return LEQ; }
"=="         { return EQL; }
"!="         { return NEQ; }

"="          { return ASSIGN; }
"+="         { return ADD_ASSIGN; }
"-="         { return SUB_ASSIGN; }
"*="         { return MUL_ASSIGN; }
"/="         { return QUO_ASSIGN; }
"%="         { return REM_ASSIGN; }

"&&"         { return LAND; }
"||"         { return LOR; }
"!"          { return NOT; }

"("          { return '('; }
")"          { return ')'; }
"["          { return '['; }
"]"          { return ']'; }
"{"          { return '{'; }
"}"          { return '}'; }

";"          { return SEMICOLON; }
","          { return ','; }


"if"         { return IF; }
"else"       { return ELSE; }
"while"      { return WHILE; }
"for"        { return FOR; }
"print"      { return PRINT; }

"int"        { return INT; }
"float"      { return FLOAT; }
"string"     { return STRING; }
"bool"       { return BOOL; }
"true"       { return TRUE; }
"false"      { return FALSE; }

{inumber}   { yylval.i_val = atoi(yytext);
                return INT_LIT;
            }
{fnumber}   { yylval.f_val = atof(yytext);
                return FLOAT_LIT;
            }

{id}        { yylval.id = strdup(yytext);
                return IDENT;
            }

<<EOF>>     { static int once = 0;
                if (once++) {
                    yyterminate();
                }
            }
[\n]        {;}
[ \t]+      {;}
.           {;}
%%
/*  C Code section */
int yywrap(void)
{
    return 1;
}