int main(int argc, char** argv)
{
// details of implementation (as per the assignment requirements)
printf("(a) Lexer implemented using TWIN BUFFER\n");
printf("(b) FIRST set automated, hardcoded FOLLOW set taken as input from a text file\n");
printf("(c) Both lexical and syntax analysis modules implemented\n");
printf("(d) PARSE TABLE generated\n");
printf("(e) STACK for syntax checking successfully implemented\n");
printf("(f) Catches only one syntax error at a time.\n");
printf("(g) PARSE TREE successfully generated\n");
printf("(h) All 3 option in driver working\n");
printf(" Press option for the defined task\n");
printf("1 : for printing the token list (on the console) generated by the lexer. Each token appears in a new line alongwith the corresponding lexeme\n");
printf("2 : for parsing to verify the syntactic correctness of the input source code \n");
printf("3 : for creating the parse tree and printing it appropriately\n");
int option;
scanf("%d", &option);
if(option == 1)
{
FILE *dfafp = fopen("dfa.txt", "r");
TreeNode *dfa;
dfa = (TreeNode *)createDFA(dfafp, dfa);
FILE *fp = fopen(*++argv, "r");
buffersize k = 1000;
buffer b = createBuffer(k);
tokenInfo info = getNextToken(fp, dfa, b, k);
// print all tokens in the input program
while(info.value != NULL)
{
printf("%s\t%s\n", info.tokenName, info.value);
info = getNextToken(fp, dfa, b, k);
}
}
else if(option == 2)
{
table t;
parseTree parsetree = parseInputSourceCode(*++argv, t);
}
else if(option == 3)
{
table t;
parseTree parsetree = parseInputSourceCode(*++argv, t);
printParseTree(parsetree, *++argv);
}
return 0;
}
static PTBL_ParseTable generateParseTable() {
int i;
ATermList vertex;
PTBL_State state;
PTBL_States statelist = PTBL_makeStatesEmpty();
PTBL_Gotos gotos;
PTBL_Choices actions;
calc_first_table();
calc_follow_table();
createDFA();
for (i = PGEN_getNumberOfStates()-1; i >= 0; i--) {
vertex = PGEN_getStateOfStateNumber(i);
gotos = (PTBL_Gotos)PGEN_getGotosOfState(vertex);
if (!gotos) {
gotos = PTBL_makeGotosEmpty();
}
else if (PGEN_getStatsFlag) {
PGEN_STATS_increaseGotos(PTBL_getGotosLength(gotos));
}
actions = PGEN_getActionsOfState(vertex);
if (!actions) {
actions = PTBL_makeChoicesEmpty();
}
else if (PGEN_getStatsFlag) {
PGEN_STATS_increaseActions(PTBL_getChoicesLength(actions));
}
state = PTBL_makeStateDefault(i, gotos, actions);
statelist = PTBL_makeStatesMany(state, statelist);
}
if (PGEN_getStatsFlag) { PGEN_STATS_print(); }
return PTBL_makeParseTableParseTable(PTBL_makeVersionDefault(), PGEN_getInitialStateNumber(), PGEN_getLabelSection(), statelist, PGEN_getPrioSection());
}
bool matchRegex(char *regex , char *str){
return checkDFA(createDFA(regex),str);
}
