/
common.lex
66 lines (58 loc) · 1.75 KB
/
common.lex
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%{
#include <stdio.h>
#include <string.h>
#include "common.h"
#include "common.tab.h"
%}
%option yylineno noyywrap
digit ([0-9])
digits {digit}+
letter ([a-zA-Z])
whitespace ([\t\n (\n\r)])
relop "=="|"<>"|"<"|"<="|">"|">="
addop "+"|"-"
mulop "*"|"/"
assign "="
and "&&"
or "||"
not (!)
reserved "int8"|"int16"|"int32"|"void"|"write"|"read"|"while"|"do"|"if"|"then"|"else"|"return"
comment #.*[^\n\r]
symbol "("|")"|"{"|"}"|","|";"|":"
num {digits}+
str \"(?:[^"\\]|\\.)*\"
id {letter}(_|{letter}|{digit})*
%%
"int8" {yylval.type = 1; return H_INT8;}
"int16" {yylval.type = 2; return H_INT16;}
"int32" {yylval.type = 4; return H_INT32;}
"void" {yylval.type = 0; return H_VOID;}
"write" {return H_WRITE;}
"read" {return H_READ;}
"while" {return H_WHILE;}
"do" {return H_DO;}
"if" {return H_IF;}
"then" {return H_THEN;}
"else" {return H_ELSE;}
"return" {return H_RETURN;}
"(" {return H_OPR;}
")" {return H_CPR;}
"{" {return H_OPM;}
"}" {return H_CPM;}
"," {return H_COMMA;}
";" {return H_SEMI;}
":" {return H_COLON;}
{assign} {return H_ASSIGN;}
{and} {return H_AND;}
{or} {return H_OR;}
{not} {return H_NOT;}
{num} {yylval.value = strdup(yytext); return H_NUM;}
{id} {yylval.value = strdup(yytext); return H_ID;}
{str} {yylval.value = strdup(yytext+1); yylval.value[strlen(yytext)-2]='\0'; return H_STR;}
{relop} {yylval.value = strdup(yytext); return H_RELOP;}
{addop} {yylval.value = strdup(yytext); return H_ADDOP; }
{mulop} {yylval.value = strdup(yytext); return H_MULOP; }
{comment} ;
{whitespace} ;
. {printf("Lexical error: '%s' in line number %d\n", yytext, yylineno); exit(1);}
%%