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Analyser.l
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%{
//#include "syntax.tab.c" //include bison's .c file...not sure
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "y.tab.h"
void yyerror (char *s);
int yylex();
//used in error function
FILE *fd; //a global copy of the input file -- accessible from error funtion
int line_no = 1;
int errors = 0;
char strbuffer[200];//a string buffer to properly return strings
char *ptr; //used in strtol function
int doubletoint; //convert double to int
//#include "hashtbl.h" //include the hash table
//extern HASHTBL *symbol; //Symbol Table declaration (global)
void ERROR (const char msg [], char *text); //synarthsh epistrofis la8oys
double decRealHandler(char *str); //convert string to real
double hexRealHandler(char *str); //conver hex real string to real
%}
Letter ([ -~]|"_")
ASCII1 [ -[]
ASCII2 []-~]
ASCII3 [ -_]
ASCII4 [a-~]
ASCIIFTPG ({ASCII3}|{ASCII4})
ASCII ({ASCII1}|{ASCII2})
Binary_Digit [0-1]
Octal_Digit [0-7]
Decimal_Digit [0-9]
Hex_Digit [0-9A-Fa-f]
/* Integer literals*/
Binary_Digits ({Binary_Digit}(_?{Binary_Digit})*)
Octal_Digits ({Octal_Digit}(_?{Octal_Digit})*)
Decimal_Digits ({Decimal_Digit}(_?{Decimal_Digit})*)
Hex_Digits ({Hex_Digit}((_)?{Hex_Digit})*)
Binary_Lit (0[bB](_)?{Binary_Digits})
Octal_Lit ((0)(o|O)?(_)?{Octal_Digits})
Decimal_Lit ((0)|(([1-9])((_)?{Decimal_Digits})?))
Hex_Lit ((0)(x|X)(_)?{Hex_Digits})
Int_Lit ({Binary_Lit}|{Octal_Lit}|{Decimal_Lit}|{Hex_Lit})
/* floating piont literals*/
Decimal_Exponent (e|E)[-+]?{Decimal_Digits}
Hex_Mantisa ((_)?{Hex_Digits}("."){Hex_Digits}?)|((_)?{Hex_Digits})|(("."){Hex_Digits})
Hex_Exponent (p|P)[-+]?{Decimal_Digits}
Hex_Float_Lit (0)(x|X){Hex_Mantisa}{Hex_Exponent}
Decimal_Float_Lit ({Decimal_Digits}("."){Decimal_Digits}?{Decimal_Exponent}?)|({Decimal_Digits}{Decimal_Exponent})|(("."){Decimal_Digits}{Decimal_Exponent}?)
Float_Lit ({Decimal_Float_Lit}|{Hex_Float_Lit})
/* Imaginary literals*/
Imaginary_Lit ({Decimal_Digits}|{Int_Lit}|{Float_Lit})(i)
/*Rune literals*/
Escaped_Char (\\)(a|b|f|n|r|t|v|(\\)|(')|(')|(\42))
Big_u_Value (\\)(U){Hex_Digit}{Hex_Digit}{Hex_Digit}{Hex_Digit}{Hex_Digit}{Hex_Digit}{Hex_Digit}{Hex_Digit}
Littel_u_Value (\\)(u){Hex_Digit}{Hex_Digit}{Hex_Digit}{Hex_Digit}
Hex_Byte_Value (\\)(x){Hex_Digit}{Hex_Digit}
Octal_Byte_Value (\\){Octal_Digit}{Octal_Digit}{Octal_Digit}
Byte_Value ({Octal_Byte_Value}|{Hex_Byte_Value})
Unicode_Value ({ASCII}|{Littel_u_Value}|{Big_u_Value}|{Escaped_Char})
Rune_Lit (')({Unicode_Value}|{Byte_Value})(')
/*String Literal*/
Interpreted_String_Lit (\")({Unicode_Value}|{Byte_Value})*(\")
Raw_String_Lit (`)(({ASCIIFTPG}|(\n))*)(`)
/*"*/
String_Lit ({Raw_String_Lit}|{Interpreted_String_Lit})
L [A-Za-z]
D [0-9]
Dp [1-9]
Bi [0-1]
OCTP [1-7]
OCT [0-7]
Hex [A-Fa-f]
W [ \t]
SPEC [NnFfTtVvBbRr]
%%
"break" {yylval.string = strdup(yytext); return( T_BREAK );}
"case" {yylval.string = strdup(yytext); return( T_CASE );}
"chan" {yylval.string = strdup(yytext); return( T_CHAN );}
"const" {yylval.string = strdup(yytext); return( T_CONST );}
"continue" {yylval.string = strdup(yytext); return( T_CONTINUE );}
"defaulte" {yylval.string = strdup(yytext); return( T_DEFAULT );}
"defer" {yylval.string = strdup(yytext); return( T_DEFER );}
"else" {yylval.string = strdup(yytext); return( T_ELSE );}
"fallthrought" {yylval.string = strdup(yytext); return( T_FALLTHROUGH );}
"for" {yylval.string = strdup(yytext); return( T_FOR );}
"func" {yylval.string = strdup(yytext); return( T_FUNC );}
"go" {yylval.string = strdup(yytext); return( T_GO );}
"goto" {yylval.string = strdup(yytext); return( T_GOTO );}
"if" {yylval.string = strdup(yytext); return( T_IF );}
"import" {yylval.string = strdup(yytext); return( T_IMPORT );}
"interface" {yylval.string = strdup(yytext); return( T_INTERFACE );}
"map" {yylval.string = strdup(yytext); return( T_MAP );}
"package" {yylval.string = strdup(yytext); return( T_PACKAGE );}
"range" {yylval.string = strdup(yytext); return( T_RANGE );}
"return" {yylval.string = strdup(yytext); return( T_RETURN );}
"select" {yylval.string = strdup(yytext); return( T_SELECT );}
"struct" {yylval.string = strdup(yytext); return( T_STRUCT );}
"switch" {yylval.string = strdup(yytext); return( T_SWITCH );}
"type" {yylval.string = strdup(yytext); return( T_TYPE );}
"var" {yylval.string = strdup(yytext); return( T_VAR );}
"make" {yylval.string = strdup(yytext); return( T_MAKE );}
"len" {yylval.string = strdup(yytext); return( T_LEN );}
"cap" {yylval.string = strdup(yytext); return( T_CAP );}
"new" {yylval.string = strdup(yytext); return( T_NEW );}
"append" {yylval.string = strdup(yytext); return( T_APPEND );}
"copy" {yylval.string = strdup(yytext); return( T_COPY );}
"close" {yylval.string = strdup(yytext); return( T_CLOSE );}
"delete" {yylval.string = strdup(yytext); return( T_DELETE );}
"complex" {yylval.string = strdup(yytext); return( T_COMPLEX );}
"real" {yylval.string = strdup(yytext); return( T_REAL );}
"imag" {yylval.string = strdup(yytext); return( T_IMAG );}
"panic" {yylval.string = strdup(yytext); return( T_PANIC );}
"recover" {yylval.string = strdup(yytext); return( T_RECOVER );}
"<" {yylval.string = strdup(yytext); return(T_LESS);}
">" {yylval.string = strdup(yytext); return(T_GREAT);}
"<=" {yylval.string = strdup(yytext); return(T_LESSOREQU);}
">=" {yylval.string = strdup(yytext); return(T_GREATOREQU);}
"!=" {yylval.string = strdup(yytext); return(T_NOTEQU);}
"==" {yylval.string = strdup(yytext); return(T_EQU);}
"&&" {yylval.string = strdup(yytext); return(T_ANDOP);}
"||" {yylval.string = strdup(yytext); return(T_OROP);}
"!" {yylval.string = strdup(yytext); return(T_NOTOP);}
"+" {yylval.string = strdup(yytext); return( T_ADDOP );}
"*" {yylval.string = strdup(yytext); return( T_MULTOP );}
"-" {yylval.string = strdup(yytext); return( T_SUBTROP );}
"/" {yylval.string = strdup(yytext); return( T_DIVOP );}
"%" {yylval.string = strdup(yytext); return( T_MOD );}
"+=" {yylval.string = strdup(yytext); return( T_ADDASSOP );}
"*=" {yylval.string = strdup(yytext); return( T_MULTASSOP );}
"-=" {yylval.string = strdup(yytext); return( T_SUBTRASSOP );}
"/=" {yylval.string = strdup(yytext); return( T_DIVASSOP );}
"++" {yylval.string = strdup(yytext); return( T_DOUBLEPLUSOP );}
"--" {yylval.string = strdup(yytext); return( T_DOUBLEMINUSOP );}
"\n" {line_no++; printf("Line %d \n", line_no);/*; yylval.string = strdup(yytext); return( T_NL);*/}
"\t" ;
"{" {yylval.string = strdup(yytext); return( T_LCURLYBR );}
"}" {yylval.string = strdup(yytext); return( T_RCURLYBR );}
"(" {yylval.string = strdup(yytext); return( T_LPAREN );}
")" {yylval.string = strdup(yytext); return( T_RPAREN );}
"[" {yylval.string = strdup(yytext); return( T_LBRACK );}
"]" {yylval.string = strdup(yytext); return( T_RBRACK );}
";" {yylval.string = strdup(yytext); return( T_SEMI );}
"..." {yylval.string = strdup(yytext); return( T_DOTDOTDOT );}
"." {yylval.string = strdup(yytext); return( T_DOT );}
"," {yylval.string = strdup(yytext); return( T_COMMA );}
":" {yylval.string = strdup(yytext); return( T_COLON );}
":=" {yylval.string = strdup(yytext); return( T_ASSIGN );}
"=" {yylval.string = strdup(yytext); return( T_ASSIGNOP );}
"//" {yylval.string = strdup(yytext); return( T_SIMPLCOMMENT );}
"/*" {yylval.string = strdup(yytext); return( T_LBLOCKCOMMET );}
"*/" {yylval.string = strdup(yytext); return( T_RBLOCKCOMMET );}
"&" {yylval.string = strdup(yytext); return( T_BITANDOP );}
"|" {yylval.string = strdup(yytext); return( T_BITOR );}
"^" {yylval.string = strdup(yytext); return( T_XOR );}
">>" {yylval.string = strdup(yytext); return( T_LSHIFT );}
"<<" {yylval.string = strdup(yytext); return( T_RSHIFT );}
"&^" {yylval.string = strdup(yytext); return( T_BITCLEAR );}
"%=" {yylval.string = strdup(yytext); return( T_MODEQUOP );}
"&=" {yylval.string = strdup(yytext); return( T_ANDEQUOP );}
"|=" {yylval.string = strdup(yytext); return( T_OREQUOP );}
"^=" {yylval.string = strdup(yytext); return( T_XOREQUOP );}
">>=" {yylval.string = strdup(yytext); return( T_LSHIFTEQU );}
"<<=" {yylval.string = strdup(yytext); return( T_RSHIFTEQU );}
"&^=" {yylval.string = strdup(yytext); return( T_BITCLEAREQU );}
"<-" {yylval.string = strdup(yytext); return( T_SENDOP );}
(_)?{L}({L}|{D}|_)*({L}|{D})|{L}* { yylval.string = strdup(yytext); return(T_ID);} //ID _hashtbl_insert(symbol,yytext,NULL,0);
{Int_Lit} {/*yylval.integer = atoi(yytext);*/return(T_ICONST);}
{Float_Lit} {/*yylval.real = decRealHandler(yytext);*/return(T_RCONST);}
{Imaginary_Lit} {yylval.string = strdup(yytext); return( T_IMCONST);}
{Rune_Lit} {/*yylval.character=yytext[1];*/return(T_CCONST);}
{String_Lit} {/*yylval.string = yytext.substr(1, yytext.size() - 2);*/ return(T_SCONST);}
<<EOF>> {/*yylval.string = "EOF";*/ /*printf("EOF\n")*/; return ( T_EOF );}
"exit" {return (T_EOF);}
{W} {}
. {ECHO; yyerror ("unexpected character");}
%%
void ERROR (const char msg [], char *text) {
/* code to print the erroneous line
reopen input file and print the line that corresponds to line_no -> number of the line that the error occured*/
int end, loop;
char str[512];
if (fd == NULL) {printf("Failed to open file\n");}
for(end = loop = 0;loop<line_no;++loop){
if(0==fgets(str, sizeof(str), fd)){//include '\n'
end = 1;//can't input (EOF)
break;
}
}
fprintf(stderr, "\n LEXIXAL ERROR at line %d. Error type: %s. Error line: %sTotal errors: %d \n",line_no, msg,str,errors);
fclose(fd);
if (errors>1) {
printf("More than one **Lexical** errors!--early termination\n");
exit(1);
}
}
int yywrap (void) {return 1;}