Peg Grammar Parser Grasshopper Language, C++ (gcc)

Peg Grammar Parser Grasshopper Language

//g++  7.4.0

/*TEST GRAMMAR AST PARSER FOR THE NEW GHC (GRASSHOPPER) COMPUTER LANGUAGE
  by: Robin Deatherage
  state machine PEG Grammer Parser
  Written in C++
*/

/* 
*  ALL INTEGERS ARE IN FACT DOUBLES
*  ALL INTEGERS ARE STORED AS BOTH DOUBLES AND AS CHAR STRING LITERALS
*  VARIABLE DATA TYPES CAN BE CHANGED BY THEIR RESPECTIVE v[vcnt].vtp; HANDLERS
*  EXTENDED ITERATIONS IN THE MAIN LOOP ARE HANDLED BY STATE SWITCHES  
*  VARIABLES, CLASS'S, FUNCTIONS, LIST, DICTIONARIES ARE ALL INDEXED BY STATE COUNTS
*  HASHTABLES FOR LIST STACK ARRAYS STORE EACH ADDED LIST'S NAME AND ITERATION INDEX LOCATION
*
*
*/
#include <iostream>
#include <sstream> //<<<<<<<<< useful
#include <string.h>
#include <string>

#ifndef VMAX
#define VMAX 195
#endif
const double pi = 3.14159;
const char NL = '\n';

struct ListIntHash {
    char lnm; // LIST NAME
    int ls; //START ITER
    int le; // END ITER
}LH[20]; // SET LOW FOR TESTING

struct ListInt { // ALL WE STORE HERE IS VALUES, THE HASHTABLE ABOVE PROVIDES WHICH LIST AND IT'S DATA
    // int ltp;
    // char lnm[VMAX];
    double ldval; //---WE STORE BOTH DATA TYPES DOUBLE AND CHAR STRING LITERAL
    // char lval;
}LD[20]; // SET LOW FOR TESTING

struct Exp { // EXPRESSIONS FOR MATH FOR INT, DOUBLE, FLOAT ETC.
    int etp;   // DATA TYPE
    int eop;   // OPERATOR TYPE
    char elh[VMAX];  // LEFT HAND
    char erh[VMAX];  // RIGHT HAND
    char eval[VMAX]; // EXPRESSION VALUE
};

struct Var {
    int vtp;
    char vnm[VMAX];
    double dval;  //---WE STORE BOTH DATA TYPES DOUBLE AND CHAR STRING LITERAL
    char val[VMAX];
};

void fetchval(struct Var p, char target[], int ndx) {
    
};

using namespace std; //----will remove after testing
enum ghexpress {};
enum gs_dtypes {INT = 1, CHAR, DOUBLE, STRING, FLOAT, BOOL, LONG, UNSIGNED};
enum gs_keywords {FOR = 1, WHILE, IF, ELSE, OPEN, FOPEN, CLOSE, TRY, CASE, };// MORE TO ADD AS WE MOVE ON
enum gh_var_states {VOFF, VON, };
enum gh_print_states {POFF, PON, };
double LHAND; 
double RHAND;
double VARHAND;
std::stringstream ss;
// state machine PEG Grammer Parser
// vtype---intger=1, char=2, double=3, string=4, float=5, bool=6
// ABSTRACT SYNTAX TREE'S REQUIRE STATE MACHINE COUNTS AND SWITCHES FOR NODE TRAVERSING
int vstate = 0;// DETERMINES VARIABLE STATE 1=ON 0=OFF
int vcnt = 0;  // DETERMINES VARIABLE COUNT, INDEXES THE VARIABLE STORING LINKED LIST ARRAY STACK
int vtype = 0; // DETERMINES VARIABLE DATA TYPE
int ststate = 0;// DETERMINES STRING STATE  1=ON 0=OFF
int scnt = 0;   // DETERMINES STRING WORD COUNT UNTIL WE REACH THE END OF STRING
int prstate = 0; // DETERMINES WHAT PRINT STATE WE ARE IN CURRENTLY
int linecount = 1; // WILL BE USED FOR ALL ERROR LINE REPORTING FOR THE NEW LANGUAGE FILE OBJECT
int lst_i_count = 0; // LIST INTEGER COUNTER
int lst_i_value_count = 0;
int lst_i_state = 0; // LIST INTEGER STATE SWITCH
int lst_s_count = 0; // LIST CHAR STRING COUNTER

int lst_s_state = 0; // LIST CHAR STRING STATE SWITCH

int main()
{
    struct Var v[20]; // SET FOR TESTING AT 20, IN PRODUCTION THIS WILL BE AT 4096 MALLOC PLUS
    //CHAR STR IS OUR TEST PEG GRAMMAR FOR THE AST PARSER BELOW, ITS ENTRY WILL BE READ FROM (ARGV CHAR ARGC)
    char str[] = "INT x EQUAL 100 SCOLN NWLN INT y EQUAL 10 SCOLN NWLN\
 PRINT LPAREN x RPAREN SCOLN NWLN FLOAT f1 EQUAL 4.579 SCOLN NWLN\
 LISTINT myarray EQUAL LBRK 1 , 2 , 3 , 4 , 5 RBRK SCOLN NWLN\
 CHAR stx EQUAL DBL I Am A String! DBL SCOLN NWLN PRINT LPAREN DBL I am a string literal. DBL RPAREN SCOLN NWLN\
 CHAR xm EQUAL DBL A short sentense for you. DBL SCOLN NWLN PRINT LPAREN xm RPAREN SCOLN NWLN INT z EQUAL 5 SCOLN NWLN\
 VARLIST LPAREN RPAREN NWLN PRINT LPAREN 43 RPAREN SCOLN NWLN PRINT LPAREN f1 RPAREN SCOLN NWLN x EQUAL x ADD y SCOLN NWLN";
    // ------removed ---  x EQUAL x PLUS y SCOLN NWLN 
    const char s[2] = " ";
    char *tok;
    char *tok2;
    char *tok3;
    char *tok4;
    char st[50];
    tok = strtok(str, s); // LOAD FIRST TOKEN FOR THE LOOP
    
    while( tok != NULL ) {        // BEGIN STATE MACHINE NODE TRAVERSALS
        //if(!strcmp(tok, "INT")) {
        //    tok = strtok(0, s); // SUSPECTED = EQUAL
        //    if(!strcmp(tok, "EQUAL")) {
        //        tok = strtok(0, s); // SUSPECTED number
                
        //    }
        //} else
            
        if(!strcmp(tok, "INT")) {
            //printf("-INT\n");
            v[vcnt].vtp = INT;
            cout << "-Store variable type" << endl;
            vstate = 1; // THE LOOK-AHEAD THAT SIGNALS INTEGER IN THE TRAVERSAL ON THE NEXT ITERATION BELOW
            
            tok = strtok(0, s);//SUSPECDTED VARIABLE OR FUNCTION NAME
            strcpy(v[vcnt].vnm, tok);// STORE THE VARIABLE
            cout << "-Store Variable Name" << endl;
            vcnt++;// INCREMENT THE COUNTER after initial var NM NAME is stored count
            
            tok = strtok(0, s);//SUSPECTED = EQUAL
            if(!strcmp(tok, "EQUAL")) {
                //cout << "-INT EQUAL" << endl;
            
                tok = strtok(0, s);// SUSPECTED VALUE IF IS LEFT HAND DIGIT ELSE ASSIGNED OR LEFT HAND VARIABLE
                if(isdigit(tok[0])) {        // PERCIEVED "VAR = DIGIT?"
                    cout << "--IS DIGIT " << tok << endl;
                    tok2 = strtok(0, s); //USING TOK2 ONLY AS A LOOK-AHEAD

if((!strcmp(tok2, "SCOLN"))) {//CONFIRM IT ENDS WITHOUT AN OPERATOR (,),+,-,/,* ETC.
                        //cout << "---TOK2 HAS SCOLN(SEMICOLON) END OF BLOCK" << endl; // ITS A DATA VALUE WE STORE IT
                        strcpy(v[vcnt-1].val, tok); // STORE IT AS ASSIGNED DATA VAR VAL VALUE, ***REQUIRES SUBTRACTING 1 FROM VCNT
                        v[vcnt-1].dval = atof(tok);
                        //strcpy(v[vcnt-1].val, "null");
                        vstate = 0; //RESET VSTATE=0
                        cout << "-Stored FLOAT Variable Value" << endl;
                    } //END IF
                //HERE STORE TOKEN NUMBER OR VAR AS LEFT-HAND LH INTO STRUCT EXPRESSION
                    
                } else
                if(isalpha(tok[0])) { // WE HAVE AN FLOAT ASSIGNED VARIABLE, CLASS OR FUNCTION CALLER 
                    cout << "--IS ALPHA ......====== " << tok << endl; //
                    // ADD DATA TO STRUCT EXPRESSION STORAGE FOR CALCULATING MATH
                    //NOT IMPLIMENTED YET----------------------XXX 
                    tok2 = strtok(0, s); // LOOK-AHEAD TO CHECK FOR "(" LPAREN --FOR CLASS OR FUNCTION CALLER
                    if((!strcmp(tok2, "LPAREN"))) { //TO DETERMINE A FUNCTION OR CLASS CALLER
                        cout << "--do FLOAT return function " << tok << endl;
                        // --------EXECUTE FUNCTION HERE --NOT IMPLIMENTED YET---------XXX
                    } //END IF LPAREN
                } //END ISALPHA
            } //END IF EQUAL
            
        } else   
        if(!strcmp(tok, "BOOL")) {
            printf("-Bool\n");
            //vcnt++; //NOT STORED YET
            vstate = 6;
            
        } else  
        if(!strcmp(tok, "PRINT")) {
            //printf("-Print----\n");
            tok = strtok(0, s); // SKIP LPAREN
            tok = strtok(0, s); //GET VARIABLE NAME, DIGIT OR DBL FOR CHAR LITERAL STRING
            
            //cout << "MAGIC OF PRINT--> "<<tok <<endl;
            cout << "MAGIC OF PRINT--> " <<endl;
            if(!strcmp(tok, "DBL")) { //NOW WE KNOW IT IS A CHAR STRING LITERAL---------LITERAL
                prstate = 1; // SET PRINT STATE TO 1 FOR LITERAL PRINT PROCESS BELOW
            // ADD LISTINT AND LISTS ARRAYS HERE---------------------------------------XXX    
            } else 
            if(isdigit(tok[0])) { // CHECK FOR DIGIT
                cout << "--PRINT IS DIGIT actual-- " << tok << endl;
                
            } else
            if(isalpha(tok[0])) { // CHECK FOR ALPHANUMERIC VAR NAME
                cout << "--PRINT VARIABLE named--->>>"<< tok <<endl;
                cout <<"\"";
                for(int i = 0; i <= vcnt; i++){
                    
                    if(strcmp(v[i].vnm, tok)==0) {//IF TRUE THEN COUT IT -----XXXbreak;
                        
                        if(v[i].vtp == INT) {
                            cout << v[i].dval;
                        } else
                        if(v[i].vtp == CHAR) {
                            cout << v[i].val;
                        } 
                    // ADD IN BOOL AND STRING LATER------------------------------XXX
                    } //END IF
                } //END FOR
                cout <<"\"\n";
            } //END IF TOK
             
        } else 
        if(!strcmp(tok, "DEF")) {
            printf("-Define Function\n");
            //vcnt++;
            //vstate = 2;
        //---------------------------------------------------------------------------------------------WE HERE***
        } else 
        if(!strcmp(tok, "LISTINT")) {
            printf("-Begin List Array\n");
            tok = strtok(0, s); // EXPECTED VARIABLE NAME
            cout << "LIST VARIABLE NAME= "<< tok <<endl; // LIST ARRAY VARIABLE NAME
            tok2 = strtok(0, s); // EXPECTED EQUAL
            cout << tok2 <<endl; //
            tok3 = strtok(0, s); // EXPECTED LBRK
            cout << tok3 <<endl; //
            lst_i_state = 1;
            
        } else 
        if(lst_i_state == 1) {
            cout<<" ---- Got LISTINT STATE--"<<endl;
            //cout << tok <<endl; // LIST ARRAY VARIABLE NAME
            
            if(!strcmp(tok, "RBRK")) {
                lst_i_state = 0; //reset listint state
            } else
            if(!strcmp(tok, ",")) { // COMA'S
                cout << "" <<endl; // WE DO NOTHING
            } else {
                
                cout << "STORED LISTINT VALUE= "<< tok <<endl; // WE STORE THE DATA BETWEEN THE COMA'S
                lst_i_value_count++; //WE INCREMENT EACH DATA VALUE, THIS BECOMES THE INDEX ITER FOR THE HASHTABLE END TAG le=?
            }
            
        // -------SOME MORE TO TRY AND TEST WITH--------    
        //} else   
        //if(!strcmp(tok, "EQUAL")) {
        //    printf("-Operator =\n"); 
            
        //} else   
        //if(!strcmp(tok, "ADD")) {
        //    printf("-Operator +\n");
            
        //} else   
        //if(!strcmp(tok, "MINUS")) {
        //    printf("-Operator -\n"); 
            
        //} else  
        //if(!strcmp(tok, "DIV")) {
        //    printf("-Operator /\n"); 
            
        //} else  
        //if(!strcmp(tok, "DBL")) {
        //    printf("-Define DBL\n");
            
        } else 
        if(!strcmp(tok, "NWLN")) {
            printf("-Define NWLN\n");
            linecount++; // IMPORTANT FOR FETCHING LINE NUMBERS FROM ERRORS IN TOKEN STREAM FILE.
            
        } else 
        if(!strcmp(tok, "SCOLN")) {
            printf("-Define SCOLN\n");
            
        } else 
        if(!strcmp(tok, "LPAREN")) {
            printf("-Define LPAREN\n");
            
        } else 
        if(!strcmp(tok, "RPAREN")) {
            printf("-Define RPAREN\n");
            
        } else 
        if(!strcmp(tok, "EQUAL")) {
            printf("-Define EQUAL\n");
            
        } else  
        if(!strcmp(tok, "VARLIST")) { // GOOD LINKED LIST MIMICKED ARRAY DESIGN
            printf("-VARLIST---  \n");
            
            //if(v[i].vtp == DOUBLE) {
            cout << "[";
            for(int i = 0; i <= vcnt; i++) {
                //if(v[i].vtp == DOUBLE) {
                if(i != vcnt-1)
                    cout << v[i].dval <<", ";
                else
                    cout << v[i].dval <<"]\n";
            } //END FOR
        
        } else 
        if(prstate == 1) {
            //tok = strtok(0, s); //GEt first word char group from char string
            if(!strcmp(tok, "DBL")) { //IF SECOND DBL CHAR STRING ENDS HERE....
                prstate = 0; //ENDS THE CHAR STRING FETCHING ROUTINE
                //strcpy(v[vcnt-1].val, st); // store the full sentense or char string
               // cout << vcnt-1 <<endl;
                cout << "\"" << st << "\"" <<endl;
                strcpy(st, ""); //reset st buffer
            } else {
            //cout << "-CHAR'S FOUND AFTER FIRST DBL---"<< tok << endl;
            strcat (st, tok); // ADD CHAR STRING GROUP TO BUFFER.....
            strcat (st, " "); // adds the space---------------------------need a solution here---XXX
            }
         
        } else { // HERE WE HAVE TO PICK UP ALL ALREADY DEFINED VARIABLES BEING REASSIGNED
            if(isalpha(tok[0])) {
                cout << "HAVE A REASSIGNED VAR " << tok <<endl;
                tok2 = strtok(0, s); // LOOK-AHEAD TO CHECK FOR EQUAL
                if(!strcmp(tok2, "EQUAL")) {
                    cout << tok << tok2 <<"========";
                    tok2 = strtok(0, s); // ADVANCE TOK2 AGAIN TO CHECK FOR LEFT HAND VAR OR NUMBER
                    //FETCH THE VARIABLE VALUE HERE
                    if(isdigit(tok2[0])) {
                        cout << "FOUND A DIGIT TOK2 " << tok2 <<endl;
                        // STORE IT HERE AS REASSIGNED VAR------------------------NOT YET IMPLIMENTED---XXX
                    } else {
                        cout << " ----- " << tok <<" -- "<< tok2 <<endl;
                        tok3 = strtok(0, s); // lets fetch the operator
                        tok4 = strtok(0, s); // WE SET THE RIGHT HAND VAR IF EXIST
                        
                        cout << " ----- " << tok3 << tok4 <<endl;
                        
                        // GET FIRST VAR VALUE******************1st value
                        for(int i = 0; i <= vcnt; i++) {
                            if(strcmp(v[i].vnm, tok2)==0) {//IF TRUE THEN COUT IT -----XXXbreak;
                                cout << v[i].val <<endl;
                                //LHAND = stof(v[i].val);
                                LHAND = v[i].dval;
                            } //END IF
                        } //END FOR
                        
                        // GET SECOND VAR VALUE*****************2nd value
                        for(int i = 0; i <= vcnt; i++) {
                            if(strcmp(v[i].vnm, tok4)==0) {//IF TRUE THEN COUT IT -----XXXbreak;
                                cout << v[i].val <<endl;
                                //RHAND = stof(v[i].val);
                                RHAND = v[i].dval;
                            } //END IF
                        } //END FOR--------------------------------------
                        
                        if(!strcmp(tok3, "ADD")) {
                            cout << LHAND + RHAND <<endl;
                            VARHAND = LHAND + RHAND;
                            //strcpy(v[vcnt-1].val, st); //
                        } else
                        if(!strcmp(tok3, "SUB")) {
                            cout << LHAND - RHAND <<endl;
                            
                            //strcpy(v[vcnt-1].val, st); //
                        } else
                        if(!strcmp(tok3, "DIV")) {
                            cout << LHAND / RHAND <<endl;
                            
                            //strcpy(v[vcnt-1].val, st); //
                        } else
                        if(!strcmp(tok3, "MULT")) {
                            cout << LHAND * RHAND <<endl;
                            
                            //strcpy(v[vcnt-1].val, st); //
                        } //END IF OPERATOR------------------------------
                        //----GET OUR FIRST VARIABLE VALUE
                        for(int i = 0; i <= vcnt; i++){
                            if(strcmp(v[i].vnm, tok)==0) {//IF TRUE THEN COUT IT -----XXXbreak;
                                cout << "tttttttttt " << v[i].dval <<endl;
                                //VARHAND = stod(v[i].val);
                                //double dbl = 2222;
                                //char* tptr = (char*)(&VARHAND);
                                //ss << VARHAND;
                                //<<<<<<<<< extract the string from the stringstream object
                                //string sr = ss.str();
                                //cout << sr;
                                //strcpy(v[i].val, sr);
                                //v[i].val = sr;
                                //cout<< "NEW VALUE= "<< v[i].val <<endl;
                            } //END IF
                        } //END FOR
                        
                    }
                } //END IF EQUAL
            } //END IF ALPHA
        } //END TOK
        
    tok = strtok(NULL, s); //flush it
    } //END WHILE
    // TEST OF STRUCT VARIABLE DATA STORES
    cout << "\n\n\n\nINT= " << v[0].vtp <<"--";
    cout << "VAR NAME= " << v[0].vnm <<"--";
    cout << "VAR VALUE of x= " <<v[0].val <<"\n";
    cout << "VAR VALUE of y= " <<v[1].val <<"\n"; // v[2] the float not implimented yet
    cout << "VAR VALUE of x + y= " << atoi(v[0].val) + atoi(v[1].val) <<"\n"; // TEST MATH X + Y
    cout << "VAR VALUE of stx= " << "\"" << v[3].val << "\"" << "\n";
    cout << "VAR VALUE of xm= " << "\"" << v[4].val << "\"" <<"\n";
    cout << st << "VCNT= " << vcnt << " Line Count= "<< linecount <<endl; // TEST CHAR STRING BUFFER FETCHER
    
} //END MAIN


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