platypus/platy_st.c

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C
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2017-03-06 15:58:14 +00:00
/* File name: platy_st.c
* Purpose:This is the main program for Assignment #2 - Scanner
* CST8152 - Compilers
* Version: 1.17.1
* Author: Svillen Ranev
* Date: 30 January 2017
*/
/* The #define _CRT_SECURE_NO_WARNINGS should be used in MS Visual Studio projects
* to suppress the warnings about using "unsafe" functions like fopen()
* and standard sting library functions defined in string.h.
* The define does not have any effect in other compiler projects.
*/
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include "buffer.h"
#include "token.h"
/* constant definitions */
#define INIT_CAPACITY 200 /* initial buffer capacity */
#define INC_FACTOR 15 /* increment factor */
#define STR_INIT_CAPACITY 100 /* initial string literal table capacity */
#define STR_CAPACITY_INC 50 /* initial string literal table capacity inc */
/*check for ANSI C compliancy */
#define ANSI_C 0
#if defined(__STDC__)
#undef ANSI_C
#define ANSI_C 1
#endif
/* Global objects - variables */
Buffer * str_LTBL; /* this buffer implements String Literal Table */
/* it is used as a repository for string literals */
int scerrnum; /* run-time error number = 0 by default (ANSI) */
/*external objects */
extern int line; /* source code line numbers - defined in scanner.c */
extern int scanner_init(Buffer * sc_buf);
extern Token malar_next_token(Buffer * sc_buf);
/*function declarations */
void err_printf(char *fmt, ...);
void display (Buffer *ptrBuffer);
long get_filesize(char *fname);
void print_token(Token t);
/* main function takes a PLATYPUS source file as
* an argument at the command line.
* usage: scanner source_file_name"
*/
int main(int argc, char ** argv){
Buffer *sc_buf; /* pointer to input (source) buffer */
FILE *fi; /* input file handle */
Token t; /* token produced by the scanner */
int loadsize = 0; /*the size of the file loaded in the buffer */
int ansi_c = !ANSI_C; /* ANSI C compliancy flag */
/* Check if the compiler option is set to compile ANSI C */
/* __DATE__, __TIME__, __LINE__, __FILE__, __STDC__ are predefined preprocessor macros*/
if(ansi_c){
err_printf("Date: %s Time: %s",__DATE__, __TIME__);
err_printf("ERROR: Compiler is not ANSI C compliant!\n");
exit(1);
}
/*check for correct arrguments - source file name */
if (argc <= 1){
/* __DATE__, __TIME__, __LINE__, __FILE__ are predefined preprocessor macros*/
err_printf("Date: %s Time: %s",__DATE__, __TIME__);
err_printf("Runtime error at line %d in file %s", __LINE__, __FILE__);
err_printf("%s%s%s",argv[0],": ","Missing source file name.");
err_printf("%s%s%s","Usage: ", "scanner", " source_file_name");
exit(1);
}
/* create a source code input buffer - multiplicative mode */
sc_buf = b_create(INIT_CAPACITY,INC_FACTOR,'m');
if (sc_buf == NULL){
err_printf("%s%s%s",argv[0],": ","Could not create source buffer");
exit(1);
}
/*open source file */
if ((fi = fopen(argv[1],"r")) == NULL){
err_printf("%s%s%s%s",argv[0],": ", "Cannot open file: ",argv[1]);
exit (1);
}
/* load source file into input buffer */
printf("Reading file %s ....Please wait\n",argv[1]);
loadsize = b_load (fi,sc_buf);
if (loadsize == R_FAIL1)
err_printf("%s%s%s",argv[0],": ","Error in loading buffer.");
/* close source file */
fclose(fi);
/*find the size of the file */
if (loadsize == LOAD_FAIL){
printf("The input file %s %s\n", argv[1],"is not completely loaded.");
printf("Input file size: %ld\n", get_filesize(argv[1]));
}
/* pack and display the source buffer */
if(b_pack(sc_buf)){
display(sc_buf);
}
/* create string Literal Table */
str_LTBL = b_create(INIT_CAPACITY,INC_FACTOR,'a');
if (str_LTBL == NULL){
err_printf("%s%s%s",argv[0],": ","Could not create string literals buffer");
exit(1);
}
/*Testbed for the scanner */
/* add SEOF to input program buffer*/
b_addc(sc_buf,'\0');
/* Initialize scanner input buffer */
if(scanner_init(sc_buf)){;
err_printf("%s%s%s",argv[0],": ","Empty program buffer - scanning canceled");
exit(1);
}
printf("\nScanning source file...\n\n");
printf("Token\t\tAttribute\n");
printf("----------------------------------\n");
do{
t= malar_next_token(sc_buf);
print_token(t);
}while(t.code != SEOF_T);
if(b_size(str_LTBL)) b_print(str_LTBL);
b_free(sc_buf);
b_free(str_LTBL);
sc_buf = str_LTBL = NULL;
return (0);
}
/* Error printing function with variable number of arguments
*/
void err_printf( char *fmt, ... ){
va_list ap;
va_start(ap, fmt);
(void)vfprintf(stderr, fmt, ap);
va_end(ap);
/* Move to new line */
if( strchr(fmt,'\n') == NULL )
fprintf(stderr,"\n");
}
/* The function displays buffer contents
*/
void display (Buffer *ptrBuffer){
printf("\nPrinting buffer parameters:\n\n");
printf("The capacity of the buffer is: %d\n",b_capacity(ptrBuffer));
printf("The current size of the buffer is: %d\n",b_size(ptrBuffer));
printf("\nPrinting buffer contents:\n\n");
b_print(ptrBuffer);
}
long get_filesize(char *fname){
FILE *input;
long flength;
input = fopen(fname, "r");
if (input == NULL){
err_printf("%s%s", "Cannot open file: ", fname);
return 0L;
}
fseek(input, 0L, SEEK_END);
flength = ftell(input);
fclose(input);
return flength;
}
/* The function prints the token returned by the scanner
*/
void print_token(Token t){
extern char * kw_table []; /* link to keyword table in */
switch(t.code){
case ERR_T:
printf("ERR_T\t\t%s",t.attribute.err_lex);
if(scerrnum){
printf("%d",scerrnum);
exit(scerrnum);
}printf("\n");
break;
case SEOF_T:
printf("SEOF_T\n" );
break;
case AVID_T:
printf("AVID_T\t\t%s\n",t.attribute.vid_lex);
break;
case SVID_T:
printf("SVID_T\t\t%s\n",t.attribute.vid_lex);
break;
case FPL_T:
printf("FPL_T\t\t%f\n",t.attribute.flt_value);
break;
case INL_T:
printf("IL_T\t\t%d\n",t.attribute.get_int);
break;
case STR_T:
printf("STR_T\t\t%d\t ",(short)t.attribute.get_int);
printf("%s\n", b_setmark(str_LTBL, (short)t.attribute.get_int));
break;
case SCC_OP_T:
printf("SCC_OP_T\n" );
break;
case ASS_OP_T:
printf("ASS_OP_T\n" );
break;
case ART_OP_T:
printf("ART_OP_T\t%d\n",t.attribute.get_int);
break;
case REL_OP_T:
printf("REL_OP_T\t%d\n",t.attribute.get_int);
break;
case LOG_OP_T:
printf("LOG_OP_T\t%d\n",t.attribute.get_int);
break;
case LPR_T:
printf("LPR_T\n" );
break;
case RPR_T:
printf("RPR_T\n" );
break;
case LBR_T:
printf("LBR_T\n" );
break;
case RBR_T:
printf("RBR_T\n" );
break;
case KW_T:
printf("KW_T\t\t%s\n",kw_table [t.attribute.get_int]);
break;
case COM_T:
printf("COM_T\n");
break;
case EOS_T:
printf("EOS_T\n" );
break;
default:
printf("Scanner error: invalid token code: %d\n", t.code);
}
}