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lexer.c
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/*
* Group 08
* Shubham Lather 2016A7PS0006P
* Devyash Parihar 2016A7PS0066P
* Rahul Khandelwal 2016A7PS0128P
* Aniruddha Karve 2016A7PS0042P
*/
/*
* lexer.c: implementation of functions of lexical analyzer
*
* list of functions implemented:
*
* void removeComments(char* testcaseFile,char* cleanFile)
* FILE* getStream(FILE *fp,char *c)
* void printToken(tokenInfo *t)
* void getNextToken(FILE *fp, tokenInfo *t)
*/
#include <string.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include "utils.h"
#include "lexer.h"
//#include "lookUpTable.h"
//#include "BufferInput.h"
#define MAX_BUFFER_SIZE 4096 //max buffer size --Standard Size
unsigned long long lineNum = 1; // the "current line" in the source file
char inputBuffer[MAX_BUFFER_SIZE]; // the input buffer
int bufIndex;
int bufSize = -1;
/*
* function to remove the comments
* and printing the result on console
*/
LookUpTable* createLookUpTable(int num_pos)
{
LookUpTable* lookUpTable = (LookUpTable*)malloc(sizeof(LookUpTable));
lookUpTable->num_pos = num_pos;
lookUpTable->positions = (List**)malloc(num_pos*sizeof(List*));
for(int i=0;i<num_pos;i++){
lookUpTable->positions[i] = (List*)malloc(sizeof(List));
lookUpTable->positions[i]->head = NULL;
}
fillLookUpTable(lookUpTable);
return lookUpTable;
}
void insertNodeElement(LookUpTable* lookUpTable, char* key, terminalId tokentype)
{
int hashvalue = hashFuncLUT(key,lookUpTable->num_pos);
NodeElement* entry = (NodeElement*)malloc(sizeof(NodeElement));
entry->type = tokentype;
entry->lexeme = (char*)malloc(sizeof(char)*(strlen(key)+1));
strcpy(entry->lexeme,key);
entry->next = lookUpTable->positions[hashvalue]->head;
lookUpTable->positions[hashvalue]->head = entry;
}
int hashFuncLUT(char* key, int num_pos)
{
int sum = 0;
for(int i=0;i<strlen(key);i++){
sum = sum*10 + (key[i] - '0');
if(sum<0)
sum = 0;
}
int hashvalue = sum % num_pos;
return hashvalue;
}
//Filling keywords in the Lookup Table
void fillLookUpTable(LookUpTable* lookUpTable)
{
insertNodeElement( lookUpTable, "with", TK_WITH);
insertNodeElement( lookUpTable, "parameters", TK_PARAMETERS);
insertNodeElement( lookUpTable, "end", TK_END);
insertNodeElement( lookUpTable, "while", TK_WHILE);
insertNodeElement( lookUpTable, "type", TK_TYPE);
insertNodeElement( lookUpTable, "_main", TK_MAIN);
insertNodeElement( lookUpTable, "global", TK_GLOBAL);
insertNodeElement( lookUpTable, "parameter", TK_PARAMETER);
insertNodeElement( lookUpTable, "list", TK_LIST);
insertNodeElement( lookUpTable, "input", TK_INPUT);
insertNodeElement( lookUpTable, "output", TK_OUTPUT);
insertNodeElement( lookUpTable, "int", TK_INT);
insertNodeElement( lookUpTable, "real", TK_REAL);
insertNodeElement( lookUpTable, "endwhile", TK_ENDWHILE);
insertNodeElement( lookUpTable, "if", TK_IF);
insertNodeElement( lookUpTable, "then", TK_THEN);
insertNodeElement( lookUpTable, "endif", TK_ENDIF);
insertNodeElement( lookUpTable, "read", TK_READ);
insertNodeElement( lookUpTable, "write", TK_WRITE);
insertNodeElement( lookUpTable, "return", TK_RETURN);
insertNodeElement( lookUpTable, "call", TK_CALL);
insertNodeElement( lookUpTable, "record", TK_RECORD);
insertNodeElement( lookUpTable, "endrecord", TK_ENDRECORD);
insertNodeElement( lookUpTable, "else", TK_ELSE);
}
terminalId getTokenType(char* key, LookUpTable* lookUpTable)
{
int hashvalue = hashFuncLUT(key, lookUpTable->num_pos);
NodeElement* temp = lookUpTable->positions[hashvalue]->head;
while(temp!=NULL)
{
if(strcmp(temp->lexeme,key)==0)
return temp->type;
temp = temp->next;
}
return 2;
}
void removeComments(char* testcaseFile,char* cleanFile)
{
FILE* src,*dst,*read;
src=fopen(testcaseFile,"r");
if (src == NULL) //check whether testcase file is opened or not
{
printf("Cannot open the test case file \n");
exit(0);
}
dst=fopen(cleanFile,"w");
if (dst == NULL) //check whether clean file is opened or not
{
printf("Cannot open the test case file \n");
exit(0);
}
char c;
int m=0,size=1000;
char* inputBuffer=(char*)malloc(1000);
while(!feof(src))
{
c=getc(src);
if(c=='%')
{
while(!feof(src))
{
if((c=getc(src))=='\n')
{
inputBuffer[m++]=c;
if(m==size)
{
inputBuffer=(char*)realloc(inputBuffer,2*size);
size=2*size;
}
break;
}
}
}
else
{
if(c!=EOF)
inputBuffer[m++]=c;
if(m==size)
{
inputBuffer=(char*)realloc(inputBuffer,2*size);
size=2*size;
}
}
}
fprintf(dst,"%s",inputBuffer);
free(inputBuffer);
fclose(src);
fclose(dst);
//printing the comment free code on console from file
read=fopen(cleanFile,"r");
if (read == NULL) //check whether clean file is opened or not
{
printf("Cannot open the test case file \n");
exit(0);
}
char ch;
while (ch != EOF)
{
printf ("%c", ch);
ch = fgetc(read);
}
fclose(read);
}
//change this function//
FILE* getStream(FILE *fp,char* c)
{
/* getting the next character from the input file using buffer*/
if(bufSize==bufIndex)
{
bufSize=fread(inputBuffer,sizeof(char),(size_t)MAX_BUFFER_SIZE,fp);
bufIndex=1;
switch(bufSize)
{
case 0:
*c=26;
return fp;
default:
*c=inputBuffer[0];
return fp;
}
}
switch(bufSize)
{
case -1:
bufSize=fread(inputBuffer,sizeof(char),(size_t)MAX_BUFFER_SIZE,fp);
bufIndex=1;
switch(bufSize)
{
case 0:
*c=26;
return fp;
default:
*c=inputBuffer[0];
return fp;
}
break;
case 0:
*c=26;
return fp;
default:
*c=inputBuffer[bufIndex];
bufIndex++;
return fp;
}
}
//function to print the tokens on console
void printToken(tokenInfo *t)
{
printf("Line %llu--> %s\t\t%s", t->lineNum, tokenRepr(t->tokenType),t->lexeme);
printf("\n");
}
void getNextToken(FILE *fp, tokenInfo *t)
{
int count = 0;
char c;
LookUpTable* lookUpTable = createLookUpTable(50);
int state = 0; //starting state
while(true)
{
fp= getStream(fp,&c);
t->lineNum = lineNum; //storing the line number of lexeme
t->lexeme[count] = c; // storing each character read in lexeme
count++;
switch(state)
{
case 0:
switch(c)
{
case '%':
state=1;
break;
case '<':
state=2;
break;
case '&':
state=5;
break;
case '@':
state=7;
break;
case '[': // TK_SQL found
t->tokenType = TK_SQL;
t->lexeme[count]='\0';
return;
case ']': // TK_SQR found
t->tokenType = TK_SQR;
t->lexeme[count]='\0';
return;
case ',': // TK_COMMA found
t->tokenType = TK_COMMA;
t->lexeme[count]='\0';
return;
case ';': // TK_SEM found
t->tokenType = TK_SEM;
t->lexeme[count]='\0';
return;
case ':': // TK_COLON found
t->tokenType = TK_COLON;
t->lexeme[count]='\0';
return;
case '.': // TK_DOT found
t->tokenType = TK_DOT;
t->lexeme[count]='\0';
return;
case '(': // TK_OP found
t->tokenType = TK_OP;
t->lexeme[count]='\0';
return;
case ')': // TK_CL found
t->tokenType = TK_CL;
t->lexeme[count]='\0';
return;
case '+': // TK_PLUS found
t->tokenType = TK_PLUS;
t->lexeme[count]='\0';
return;
case '-': // TK_MINUS found
t->tokenType = TK_MINUS;
t->lexeme[count]='\0';
return;
case '*': // TK_MUL found
t->tokenType = TK_MUL;
t->lexeme[count]='\0';
return;
case '/': // TK_DIV found
t->tokenType = TK_DIV;
t->lexeme[count]='\0';
return;
case '~': // TK_NOT found
t->tokenType = TK_NOT;
t->lexeme[count]='\0';
return;
case '=':
state = 9;
break;
case '>':
state = 10;
break;
case '!':
state = 11;
break;
case 'b':
case 'c':
case 'd':
state = 12;
break;
case 'a':
case 'e':
case 'f':
case 'g':
case 'h':
case 'i':
case 'j':
case 'k':
case 'l':
case 'm':
case 'n':
case 'o':
case 'p':
case 'q':
case 'r':
case 's':
case 't':
case 'u':
case 'v':
case 'w':
case 'x':
case 'y':
case 'z':
state = 13;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
state = 16;
break;
case '_':
state = 19;
break;
case '#':
state = 22;
break;
case '\n':
lineNum++;
case ' ':
case '\t':
case '\r':
state = 24;
break;
case 26: // End Of File (26 is ASCII value of EOF)
t->tokenType = TK_EOF;
sprintf(t->lexeme, "End of File");
//t->lexeme[count]='\0';
return;
default: // invalid starting character
sprintf(t->lexeme, "Unknown Symbol %c", c); // storing the error message in t->lexeme
t->tokenType = TK_ERROR;
// t->lexeme[count]='\0';//---------------------------
return;
}
break;
case 1: // comment starts and read till encounter a new line
switch(c)
{
case '\n':
bufIndex--;
t->lexeme[count-1]='\0';
state = 0; //after end of comment return to state 0
count = 0;
//lineNum++;
t->tokenType = TK_COMMENT;
return;
default:
;
}
break;
case 2:
switch(c)
{
case '-':
state = 3;
break;
case '=': // token TK_LE found
t->tokenType = TK_LE;
t->lexeme[count]='\0';
return;
default:
t->tokenType = TK_LT;
bufIndex--; // push back the extra read character in buffer(retract)
t->lexeme[count-1]='\0';
return;
}
break;
case 3:
switch(c)
{
case '-':
state = 4;
break;
default:
bufIndex--;
t->tokenType = TK_ERROR;
strcpy(t->lexeme, "Unknown pattern <-");// storing the error message in t->lexeme
return;
}
break;
case 4:
switch(c)
{
case '-': // TK_ASSIGNOP found
t->tokenType = TK_ASSIGNOP;
t->lexeme[count]='\0';
return;
default:
bufIndex--;
t->tokenType = TK_ERROR;
strcpy(t->lexeme, "Unknown pattern <--");// storing the error message in t->lexeme
return;
}
break;
case 5:
switch(c)
{
case '&':
state = 6;
break;
default:
t->tokenType = TK_ERROR;
if(c=='\n')
{
lineNum++;
return;
}
if(c=='\t' || c=='\r' || c == ' ')
return;
sprintf(t->lexeme, "Unknown pattern &");// storing the error message in t->lexeme
bufIndex--;
return;
}
break;
case 6:
switch(c)
{
case '&': // TK_AND found
t->tokenType = TK_AND;
t->lexeme[count]='\0';
return;
default:
sprintf(t->lexeme, "Unknown pattern &&");// storing the error message in t->lexeme
t->tokenType = TK_ERROR;
if(c=='\n')
{
lineNum++;
return;
}
if(c=='\t' || c=='\r' || c == ' ')
return;
bufIndex--;
return;
}
break;
case 7:
switch(c)
{
case '@':
state = 8;
break;
default:
sprintf(t->lexeme, "Unknown pattern @");// storing the error message in t->lexeme
t->tokenType = TK_ERROR;
if(c=='\n')
{
lineNum++;
return;
}
if(c=='\t' || c=='\r' || c == ' ')
return;
bufIndex--;
return;
}
break;
case 8:
switch(c)
{
case '@': // TK_OR found
t->tokenType = TK_OR;
t->lexeme[count]='\0';
return;
default:
sprintf(t->lexeme, "Unknown pattern @@");
t->tokenType = TK_ERROR;
if(c=='\n')
{
lineNum++;
return;
}
if(c=='\t' || c=='\r' || c == ' ')
return;
bufIndex--;
return;
}
break;
case 9:
switch(c)
{
case '=': // TK_EQ found
t->tokenType = TK_EQ;
t->lexeme[count]='\0';
return;
default:
sprintf(t->lexeme,"Unknown pattern =");
t->tokenType = TK_ERROR;
if(c=='\n')
{
lineNum++;
return;
}
if(c=='\t' || c=='\r' || c == ' ')
return;
bufIndex--;
return;
}
break;
case 10:
switch(c)
{
case '=': // TK_GE found
t->tokenType = TK_GE;
t->lexeme[count]='\0';
return;
default: // TK_GT found
bufIndex--;
t->lexeme[count-1]='\0';
t->tokenType = TK_GT;
return;
}
break;
case 11:
switch(c)
{
case '=': // TK_NE found
t->tokenType = TK_NE;
t->lexeme[count]='\0';
return;
default:
sprintf(t->lexeme, "Unknown pattern !");// storing the error message in t->lexeme
t->tokenType = TK_ERROR;
if(c=='\n')
{
lineNum++;
return;
}
if(c=='\t' || c=='\r' || c == ' ')
return;
bufIndex--;
return;
}
break;
case 12:
switch(c)
{
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
case 'g':
case 'h':
case 'i':
case 'j':
case 'k':
case 'l':
case 'm':
case 'n':
case 'o':
case 'p':
case 'q':
case 'r':
case 's':
case 't':
case 'u':
case 'v':
case 'w':
case 'x':
case 'y':
case 'z':
state = 13;
break;
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
state = 14;
break;
default:
bufIndex--;
t->tokenType = getTokenType(t->lexeme,lookUpTable);
t->lexeme[count-1] = '\0';//-----------------
if(c=='\n' || c=='\t' || c=='\r' || c == ' ')
return;
return;
}
break;
case 13:
switch(c)
{
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
case 'g':
case 'h':
case 'i':
case 'j':
case 'k':
case 'l':
case 'm':
case 'n':
case 'o':
case 'p':
case 'q':
case 'r':
case 's':
case 't':
case 'u':
case 'v':
case 'w':
case 'x':
case 'y':
case 'z':
if(count == 21)//to check that the length is 20 characters and if greater return error
{
while(c >= 97 && c <= 122)
fp= getStream(fp,&c);
bufIndex--;
t->tokenType = TK_ERROR;
t->lexeme[21] = '\0';
sprintf(t->lexeme, "Identifier is longer than the prescribed length of 20 characters");// storing the error message in t->lexeme
return;
}
break;
default:
bufIndex--;
t->lexeme[count - 1] = '\0';
t->tokenType=getTokenType(t->lexeme,lookUpTable);
if(c=='\n' || c=='\t' || c=='\r' || c == ' ')
return;
return;
}
break;
case 14:
switch(c)
{
case 'b':
case 'c':
case 'd':
if(count == 21) //to check that the length is 20 characters and if greater return error
{
while(c >= 98 && c <= 100)
fp= getStream(fp,&c);
while(c >= 50 && c <= 55)
fp= getStream(fp,&c);
bufIndex--;
t->tokenType = TK_ERROR;
t->lexeme[21] = '\0';
sprintf(t->lexeme, "Identifier is longer than the prescribed length of 20 characters");// storing the error message in t->lexeme
return;
}
break;
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
if(count == 21) //to check that the length is 20 characters and if greater return error
{
while(c >= 50 && c <= 55)
fp= getStream(fp,&c);
bufIndex--;
t->tokenType = TK_ERROR;
t->lexeme[21] = '\0';
sprintf(t->lexeme, "Identifier is longer than the prescribed length of 20 characters");// storing the error message in t->lexeme
return;
}
state = 15;
break;
default: // TK_ID found
bufIndex--;
t->lexeme[count - 1] = '\0';
t->tokenType = TK_ID;
if(c=='\n' || c=='\t' || c=='\r' || c == ' ')
return;
return;
}
break;
case 15:
switch(c)
{
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
if(count == 21)//to check that the length is 20 characters and if greater return error
{
while(c >= 50 && c <= 55)
fp= getStream(fp,&c);
bufIndex--;
t->tokenType = TK_ERROR;
t->lexeme[21] = '\0';
sprintf(t->lexeme, "Identifier is longer than the prescribed length of 20 characters");// storing the error message in t->lexeme
return;
}
break;
default: // TK_ID found
bufIndex--;
t->lexeme[count-1]='\0';
t->tokenType = TK_ID;
if(c=='\n' || c=='\t' || c=='\r' || c == ' ')
return;
t->lexeme[count - 1] = '\0';
return;
}
break;
case 16:
switch(c)
{
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if(count == 21)
{
while(c >= 48 && c <= 57)
{
fp= getStream(fp,&c);
t->lexeme[count++]=c;
}
switch(c)
{
case '.':
fp= getStream(fp,&c);
t->lexeme[count++]=c;
while(c >= 48 && c <= 57)
{
fp= getStream(fp,&c);
t->lexeme[count++]=c;
}
bufIndex--;
break;
default:
bufIndex--;
break;
}
t->tokenType = TK_ERROR;
t->lexeme[count-1] = '\0';
sprintf(t->lexeme, "%s: number longer than prescribed length", t->lexeme);
return;
}
break;
case '.':
state = 17;
break;
default: // TK_NUM found
bufIndex--;
t->lexeme[count-1]='\0';
t->tokenType = TK_NUM;
if(c=='\n' || c=='\t' || c=='\r' || c == ' ')
return;
t->lexeme[count - 1] = '\0';
return;
}
break;
case 17:
switch(c)
{
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
state = 18;
break;
default:
bufIndex--;
t->lexeme[count - 1] = '\0';
sprintf(t->lexeme, "unknown pattern %s", t->lexeme);
t->tokenType = TK_ERROR;
return;
}
break;
case 18:
switch(c)
{
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9': // TK_RNUM found
fp= getStream(fp,&c);
t->lexeme[count++]=c;
if(c >=48 && c<= 57)
{
while(c >=48 && c<= 57)
{
fp= getStream(fp,&c);
t->lexeme[count++]=c;
}
bufIndex--;
t->tokenType = TK_ERROR;
t->lexeme[count-1] = '\0';
strcat(t->lexeme," : Unknown Pattern");
return;
}
bufIndex--;
t->tokenType = TK_RNUM;
t->lexeme[count-1] = '\0';
return;
default:
bufIndex--;
t->tokenType = TK_ERROR;
t->lexeme[count-1] = '\0';
strcat(t->lexeme," : Unknown Pattern");
return;
}
break;
case 19:
switch(c)
{
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
case 'g':
case 'h':
case 'i':
case 'j':
case 'k':
case 'l':
case 'm':
case 'n':
case 'o':
case 'p':
case 'q':
case 'r':
case 's':
case 't':
case 'u':
case 'v':
case 'w':
case 'x':
case 'y':
case 'z':
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
case 'G':
case 'H':
case 'I':
case 'J':
case 'K':
case 'L':
case 'M':
case 'N':
case 'O':
case 'P':
case 'Q':
case 'R':
case 'S':
case 'T':
case 'U':
case 'V':
case 'W':
case 'X':
case 'Y':
case 'Z':
state = 20;
break;
default:
sprintf(t->lexeme, "Unknown pattern _");
t->tokenType = TK_ERROR;
bufIndex--;
return;
}
break;