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Sally.cpp
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915 lines (812 loc) · 19.4 KB
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// File: Sally.cpp
//
// CMSC 341 Fall 2018 Project 2
//
//
// Implementation of member functions of Sally Forth interpreter
//
#include <iostream>
#include <string>
#include <list>
#include <stack>
#include <stdexcept>
#include <cstdlib>
using namespace std;
#include "Sally.h"
// Basic Token constructor. Just assigns values.
//
Token::Token(TokenKind kind, int val, string txt) {
m_kind = kind;
m_value = val;
m_text = txt;
}
// Basic SymTabEntry constructor. Just assigns values.
//
SymTabEntry::SymTabEntry(TokenKind kind, int val, operation_t fptr) {
m_kind = kind;
m_value = val;
m_dothis = fptr;
}
// Constructor for Sally Forth interpreter.
// Adds built-in functions to the symbol table.
//
Sally::Sally(istream& input_stream) :
istrm(input_stream) // use member initializer to bind reference
{
skip = 0;
marker = 0;
action = 0;
symtab["DUMP"] = SymTabEntry(KEYWORD, 0, &doDUMP);
symtab["+"] = SymTabEntry(KEYWORD, 0, &doPlus);
symtab["-"] = SymTabEntry(KEYWORD, 0, &doMinus);
symtab["*"] = SymTabEntry(KEYWORD, 0, &doTimes);
symtab["/"] = SymTabEntry(KEYWORD, 0, &doDivide);
symtab["%"] = SymTabEntry(KEYWORD, 0, &doMod);
symtab["NEG"] = SymTabEntry(KEYWORD, 0, &doNEG);
symtab["."] = SymTabEntry(KEYWORD, 0, &doDOT);
symtab["SP"] = SymTabEntry(KEYWORD, 0, &doSP);
symtab["CR"] = SymTabEntry(KEYWORD, 0, &doCR);
symtab["SET"] = SymTabEntry(KEYWORD, 0, &doSET);
symtab["DROP"] = SymTabEntry(KEYWORD, 0, &doDROP);
symtab["DUP"] = SymTabEntry(KEYWORD, 0, &doDUP);
symtab["SWAP"] = SymTabEntry(KEYWORD, 0, &doSWAP);
symtab["ROT"] = SymTabEntry(KEYWORD, 0, &doROT);
symtab["@"] = SymTabEntry(KEYWORD, 0, &doAMPERSAND);
symtab["AND"] = SymTabEntry(KEYWORD, 0, &doAND);
symtab["OR"] = SymTabEntry(KEYWORD, 0, &doOR);
symtab["NOT"] = SymTabEntry(KEYWORD, 0, &doNOT);
symtab["!"] = SymTabEntry(KEYWORD, 0, &doEXCLAMATION);
symtab["<"] = SymTabEntry(KEYWORD, 0, &doLESSTHAN);
symtab["<="] = SymTabEntry(KEYWORD, 0, &doLESSTHANEQUAL);
symtab["=="] = SymTabEntry(KEYWORD, 0, &doEQUIVALENCY);
symtab["!="] = SymTabEntry(KEYWORD, 0, &doNOTEQUALS);
symtab[">="] = SymTabEntry(KEYWORD, 0, &doGREATERTHANEQUAL);
symtab[">"] = SymTabEntry(KEYWORD, 0, &doGREATERTHAN);
symtab["IFTHEN"] = SymTabEntry(KEYWORD, 0, &doIFTHEN);
symtab["ELSE"] = SymTabEntry(KEYWORD, 0, &doELSE);
symtab["ENDIF"] = SymTabEntry(KEYWORD, 0, &doENDIF);
symtab["DO"] = SymTabEntry(KEYWORD, 0, &doDO);
}
// This function should be called when tkBuffer is empty.
// It adds tokens to tkBuffer.
//
// This function returns when an empty line was entered
// or if the end-of-file has been reached.
//
// This function returns false when the end-of-file was encountered.
//
// Processing done by fillBuffer()
// - detects and ignores comments.
// - detects string literals and combines as 1 token
// - detetcs base 10 numbers
//
//
bool Sally::fillBuffer() {
string line; // single line of input
int pos; // current position in the line
int len; // # of char in current token
long int n; // int value of token
char *endPtr; // used with strtol()
while (true) { // keep reading until empty line read or eof
// get one line from standard in
//
getline(istrm, line);
// if "normal" empty line encountered, return to mainLoop
//
if (line.empty() && !istrm.eof()) {
//cout << "Red Flag" << endl;
return true;
}
// if eof encountered, return to mainLoop, but say no more
// input available
//
if (istrm.eof()) {
return false;
}
// Process line read
pos = 0; // start from the beginning
// skip over initial spaces & tabs
//
while (line[pos] != '\0' && (line[pos] == ' ' || line[pos] == '\t')) {
pos++;
}
// Keep going until end of line
//
while (line[pos] != '\0') {
// is it a comment?? skip rest of line.
//
if (line[pos] == '/' && line[pos + 1] == '/') break;
// is it a string literal?
//
if (line[pos] == '.' && line[pos + 1] == '"') {
pos += 2; // skip over the ."
len = 0; // track length of literal
// look for matching quote or end of line
//
while (line[pos + len] != '\0' && line[pos + len] != '"') {
len++;
}
// make new string with characters from
// line[pos] to line[pos+len-1]
string literal(line, pos, len); // copy from pos for len chars
// Add to token list
//
tkBuffer.push_back(Token(STRING, 0, literal));
// Different update if end reached or " found
//
if (line[pos + len] == '\0') {
pos = pos + len;
}
else {
pos = pos + len + 1;
}
}
else { // otherwise "normal" token
len = 0; // track length of token
// line[pos] should be an non-white space character
// look for end of line or space or tab
//
while (line[pos + len] != '\0' && line[pos + len] != ' ' && line[pos + len] != '\t') {
len++;
}
string literal(line, pos, len); // copy form pos for len chars
pos = pos + len;
// Try to convert to a number
//
n = strtol(literal.c_str(), &endPtr, 10);
if (*endPtr == '\0') {
tkBuffer.push_back(Token(INTEGER, n, literal));
}
else {
tkBuffer.push_back(Token(UNKNOWN, 0, literal));
}
}
// skip over trailing spaces & tabs
//
while (line[pos] != '\0' && (line[pos] == ' ' || line[pos] == '\t')) {
pos++;
}
}
}
}
// Return next token from tkBuffer.
// Call fillBuffer() if needed.
// Checks for end-of-file and throws exception
//
Token Sally::nextToken() {
Token tk;
bool more = true;
while (more && tkBuffer.empty()) {
more = fillBuffer();
}
if (!more && tkBuffer.empty()) {
throw EOProgram("End of Program");
}
tk = tkBuffer.front();
tkBuffer.pop_front();
return tk;
}
// The main interpreter loop of the Sally Forth interpreter.
// It gets a token and either push the token onto the parameter
// stack or looks for it in the symbol table.
//
//
void Sally::mainLoop() {
Token tk;
map<string, SymTabEntry>::iterator it;
try {
while (1) {
tk = nextToken();
//cout << "skip: " << skip << " tk.m_text: "<<tk.m_text<<" marker: "<<marker<<endl;
if (skip % 2 == 0)
{
if (tk.m_kind == INTEGER || tk.m_kind == STRING) {
// if INTEGER or STRING just push onto stack
params.push(tk);
}
else {
it = symtab.find(tk.m_text);
if (it == symtab.end()) { // not in symtab
params.push(tk);
}
else if (it->second.m_kind == KEYWORD) {
// invoke the function for this operation
//
it->second.m_dothis(this);
}
else if (it->second.m_kind == VARIABLE) {
// variables are pushed as tokens
//
tk.m_kind = VARIABLE;
params.push(tk);
}
else {
// default action
//
params.push(tk);
}
}
}
else
{
//it = symtab.find(tk.m_text);
if (tk.m_text == "ELSE")
{
it = symtab.find(tk.m_text);
it->second.m_dothis(this);
}
if (tk.m_text == "ENDIF")
{
it = symtab.find(tk.m_text);
it->second.m_dothis(this);
}
if (tk.m_text == "IFTHEN")
{
it = symtab.find(tk.m_text);
it->second.m_dothis(this);
}
}
}
}
catch (EOProgram& e) {
cerr << "End of Program\n";
if (params.size() == 0) {
cerr << "Parameter stack empty.\n";
}
else {
cerr << "Parameter stack has " << params.size() << " token(s).\n";
}
}
catch (out_of_range& e) {
cerr << "Parameter stack underflow??\n";
}
catch (...) {
cerr << "Unexpected exception caught\n";
}
}
// -------------------------------------------------------
void Sally::doIFTHEN(Sally *Sptr)
{
Token tk;
tk = Sptr->params.top();
//Sptr->params.pop();
int truthValue = tk.m_value;
if(Sptr->skip%2==1)
{
tk = Sptr->nextToken();
Sptr->skip = Sptr->skip + 1;
}
else if (truthValue == 1)
{
Sptr->skip = Sptr->skip + 2;
//cout << "IfThen function skip= " <<Sptr->skip<< endl;
}
else
{
tk = Sptr->nextToken();
Sptr->skip = Sptr->skip + 1;
Sptr->marker++;
}
}
void Sally::doELSE(Sally *Sptr)
{
Token tk;
Sptr->skip = Sptr->skip - 1;
}
void Sally::doENDIF(Sally *Sptr)
{
if (Sptr->marker == 0)
{
//Sptr->skip--;
Sptr->skip = Sptr->skip - 1;
//cout << "function skip= " << Sptr->skip << endl;
}
else
{
Sptr->marker=Sptr->marker-1;
}
}
void Sally::doDO(Sally *Sptr)
{
//cout << "Do triggered" << endl;
int continueLoop = 1;
Token tk;
Token tk2;
Sptr->tempBuffer.push_back(tk);
//Token arr[10];
cout << "DO LOOP" << endl;
while(1==continueLoop)
{
//cout << "Do triggered" << endl;
tk = Sptr->nextToken();
//cout << "Token" << tk.m_text << tk.m_value<<endl;
//cout << "token: " << tk.m_text << endl;
Sptr->tempBuffer.push_back(tk);
if (tk.m_text == "UNTIL")
{
//cout << "TESTING" << endl;
continueLoop = 0;
//cout << "test" << endl;
}
}
continueLoop = 1;
//cout << "TESTING" << endl;
while (continueLoop == 1)
{
for (Token tk:Sptr->tempBuffer)
{
//cout << "tk.m_text "<<tk.m_text << endl;
//cout << "do triggered" << endl;
if (tk.m_kind == INTEGER || tk.m_kind == STRING) {
// if INTEGER or STRING just push onto stack
Sptr->params.push(tk);
//cout << "triggered" << endl;
}
else {
//cout << "triggered" << endl;
map<string, SymTabEntry>::iterator it;
it = Sptr->symtab.find(tk.m_text);
if (it == Sptr->symtab.end()) { // not in symtab
Sptr->params.push(tk);
}
else if (it->second.m_kind == KEYWORD) {
// invoke the function for this operation
//
it->second.m_dothis(Sptr);
}
else if (it->second.m_kind == VARIABLE) {
// variables are pushed as tokens
//
tk.m_kind = VARIABLE;
Sptr->params.push(tk);
}
}
if (tk.m_text == "UNTIL")
{
//cout << "UNTIL in Play" << endl;
Sptr->params.pop();
tk2 = Sptr->params.top();
Sptr->params.pop();
if (tk2.m_value== 1)
{
continueLoop = 0;
break;
}
}
}
}
}
void Sally::doPlus(Sally *Sptr) {
Token p1, p2;
if (Sptr->params.size() < 2) {
throw out_of_range("Need two parameters for +.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
p2 = Sptr->params.top();
Sptr->params.pop();
int answer = p2.m_value + p1.m_value;
Sptr->params.push(Token(INTEGER, answer, ""));
}
void Sally::doMinus(Sally *Sptr) {
Token p1, p2;
if (Sptr->params.size() < 2) {
throw out_of_range("Need two parameters for -.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
p2 = Sptr->params.top();
Sptr->params.pop();
int answer = p2.m_value - p1.m_value;
Sptr->params.push(Token(INTEGER, answer, ""));
}
void Sally::doTimes(Sally *Sptr) {
Token p1, p2;
if (Sptr->params.size() < 2) {
throw out_of_range("Need two parameters for *.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
p2 = Sptr->params.top();
Sptr->params.pop();
int answer = p2.m_value * p1.m_value;
Sptr->params.push(Token(INTEGER, answer, ""));
}
void Sally::doDivide(Sally *Sptr) {
Token p1, p2;
if (Sptr->params.size() < 2) {
throw out_of_range("Need two parameters for /.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
p2 = Sptr->params.top();
Sptr->params.pop();
int answer = p2.m_value / p1.m_value;
Sptr->params.push(Token(INTEGER, answer, ""));
}
void Sally::doMod(Sally *Sptr) {
Token p1, p2;
if (Sptr->params.size() < 2) {
throw out_of_range("Need two parameters for %.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
p2 = Sptr->params.top();
Sptr->params.pop();
int answer = p2.m_value % p1.m_value;
Sptr->params.push(Token(INTEGER, answer, ""));
}
void Sally::doNEG(Sally *Sptr) {
Token p;
if (Sptr->params.size() < 1) {
throw out_of_range("Need one parameter for NEG.");
}
p = Sptr->params.top();
Sptr->params.pop();
Sptr->params.push(Token(INTEGER, -p.m_value, ""));
}
void Sally::doDOT(Sally *Sptr) {
Token p;
//cout << "Print Function triggering" << endl;
if (Sptr->params.size() < 1) {
throw out_of_range("Need one parameter for .");
}
p = Sptr->params.top();
Sptr->params.pop();
if (p.m_kind == INTEGER) {
cout << p.m_value;
}
else {
cout << p.m_text;
}
}
void Sally::doSP(Sally *Sptr) {
cout << " ";
}
void Sally::doCR(Sally *Sptr) {
cout << endl;
}
void Sally::doDUMP(Sally *Sptr) {
// do whatever for debugging
}
void Sally::doDUP(Sally *Sptr) {
Token p1;
if (Sptr->params.size() < 1) {
throw out_of_range("Need one parameter to DUP.");
}
p1 = Sptr->params.top();
//Sptr->params.pop();
int duplicate = p1.m_value;
Sptr->params.push(Token(INTEGER, duplicate, ""));
}
void Sally::doDROP(Sally *Sptr)
{
Token p1;
if (Sptr->params.size() < 1) {
throw out_of_range("Need a parameter to DROP.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
}
void Sally::doSWAP(Sally *Sptr)
{
Token p1;
Token p2;
if (Sptr->params.size() < 2)
{
throw out_of_range("Need 2 items to SWAP them.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
p2 = Sptr->params.top();
Sptr->params.pop();
int answer1 = p2.m_value;
int answer2 = p1.m_value;
Sptr->params.push(Token(INTEGER, answer1, ""));
Sptr->params.push(Token(INTEGER, answer2, ""));
}
void Sally::doROT(Sally *Sptr)
{
Token p1;
Token p2;
Token p3;
if (Sptr->params.size() < 3)
{
throw out_of_range("Need 3 items to SWAP them.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
p2 = Sptr->params.top();
Sptr->params.pop();
p3 = Sptr->params.top();
Sptr->params.pop();
int answer1 = p2.m_value;
int answer2 = p1.m_value;
int answer3 = p3.m_value;
Sptr->params.push(Token(INTEGER, answer1, ""));
Sptr->params.push(Token(INTEGER, answer2, ""));
Sptr->params.push(Token(INTEGER, answer3, ""));
}
void Sally::doSET(Sally *Sptr)
{
Token tk;
Token tk2;
tk = Sptr->params.top();
//cout << "tk.m_value" << tk.m_value << " " << tk.m_text << endl;
Sptr->params.pop();
tk2 = Sptr->params.top();
//cout << "tk2.m_value" << tk2.m_value <<" " << tk2.m_text<< endl;
Sptr->params.pop();
map<string, SymTabEntry>::iterator it;
it = Sptr->symtab.find(tk.m_text);
if (it == Sptr->symtab.end())
{
//cout << "tk2.m_value" << tk2.m_value << " " << tk2.m_text << endl;
Sptr->symtab[tk.m_text] = SymTabEntry(VARIABLE, tk2.m_value, NULL);
}
else if (it->second.m_kind == KEYWORD)
{
throw out_of_range("This is a keyword and can't be changed");
}
else if (it->second.m_kind == VARIABLE)
{
cout << "Variable already set" << endl;
//throw out_of_range("This variable is already set");
}
}
void Sally::doAMPERSAND(Sally *Sptr)
{
Token tk;
tk = Sptr->params.top();
Sptr->params.pop();
//cout << "tk.m_value" << tk.m_value << " " << tk.m_text << endl;
//Sptr->params.pop();
map<string, SymTabEntry>::iterator it;
it = Sptr->symtab.find(tk.m_text);
if (it == Sptr->symtab.end())
{
cout << "This value does not exist" << endl;
throw out_of_range("This value does not exist");
}
else
{
Sptr->params.push(Token(INTEGER, it->second.m_value, ""));
//cout << "Test" << endl;
//tk = Sptr->params.top();
//cout << tk.m_value << endl;
}
}
void Sally::doEXCLAMATION(Sally *Sptr)
{
Token tk;
Token tk2;
tk = Sptr->params.top();
Sptr->params.pop();
tk2 = Sptr->params.top();
Sptr->params.pop();
map<string, SymTabEntry>::iterator it;
it = Sptr->symtab.find(tk.m_text);
if (it == Sptr->symtab.end()) {
cout << "No such variable exists" << endl;
throw out_of_range("No such variable exists");
}
else
{
Sptr->symtab[tk.m_text] = SymTabEntry(VARIABLE, tk2.m_value, NULL);
}
}
void Sally::doLESSTHAN(Sally *Sptr)
{
{
Token p1;
Token p2;
if (Sptr->params.size() < 2)
{
throw out_of_range("Need 2 items to do comparison.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
p2 = Sptr->params.top();
Sptr->params.pop();
int answer1 = p2.m_value;
int answer2 = p1.m_value;
if (answer1 <= answer2)
{
Sptr->params.push(Token(INTEGER, 1, ""));
}
else
{
Sptr->params.push(Token(INTEGER, 0, ""));
}
}
}
void Sally::doLESSTHANEQUAL(Sally *Sptr)
{
Token p1;
Token p2;
if (Sptr->params.size() < 2)
{
throw out_of_range("Need 2 items to do comparison.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
p2 = Sptr->params.top();
Sptr->params.pop();
int answer1 = p2.m_value;
int answer2 = p1.m_value;
if (answer1 <= answer2)
{
Sptr->params.push(Token(INTEGER, 1, ""));
}
else
{
Sptr->params.push(Token(INTEGER, 0, ""));
}
}
void Sally::doEQUIVALENCY(Sally *Sptr)
{
{
Token p1;
Token p2;
if (Sptr->params.size() < 2)
{
throw out_of_range("Need 2 items to do comparison.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
p2 = Sptr->params.top();
Sptr->params.pop();
int answer1 = p2.m_value;
int answer2 = p1.m_value;
if (answer1 <= answer2)
{
Sptr->params.push(Token(INTEGER, 1, ""));
}
else
{
Sptr->params.push(Token(INTEGER, 0, ""));
}
}
}
void Sally::doNOTEQUALS(Sally *Sptr)
{
{
Token p1;
Token p2;
if (Sptr->params.size() < 2)
{
throw out_of_range("Need 2 items to do comparison.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
p2 = Sptr->params.top();
Sptr->params.pop();
int answer1 = p2.m_value;
int answer2 = p1.m_value;
if (answer1 != answer2)
{
Sptr->params.push(Token(INTEGER, 1, ""));
}
else
{
Sptr->params.push(Token(INTEGER, 0, ""));
}
}
}
void Sally::doGREATERTHANEQUAL(Sally *Sptr)
{
{
Token p1;
Token p2;
if (Sptr->params.size() < 2)
{
throw out_of_range("Need 2 items to do comparison.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
p2 = Sptr->params.top();
Sptr->params.pop();
int answer1 = p2.m_value;
int answer2 = p1.m_value;
if (answer1 >= answer2)
{
Sptr->params.push(Token(INTEGER, 1, ""));
}
else
{
Sptr->params.push(Token(INTEGER, 0, ""));
}
}
}
void Sally::doGREATERTHAN(Sally *Sptr)
{
{
Token p1;
Token p2;
if (Sptr->params.size() < 2)
{
throw out_of_range("Need 2 items to do comparison.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
p2 = Sptr->params.top();
Sptr->params.pop();
int answer1 = p2.m_value;
int answer2 = p1.m_value;
if (answer1 > answer2)
{
Sptr->params.push(Token(INTEGER, 1, ""));
}
else
{
Sptr->params.push(Token(INTEGER, 0, ""));
}
}
}
void Sally::doAND(Sally *Sptr)
{
Token p1, p2;
if (Sptr->params.size() < 2) {
cout << "Need two parameters for -." << endl;
throw out_of_range("Need two parameters for -.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
p2 = Sptr->params.top();
Sptr->params.pop();
if (p1.m_value == 0 || p2.m_value == 0)
{
Sptr->params.push(Token(INTEGER, 0, ""));
}
else
{
Sptr->params.push(Token(INTEGER, 1, ""));
}
}
void Sally::doOR(Sally *Sptr)
{
Token p1, p2;
if (Sptr->params.size() < 2) {
cout << "Need two parameters for -." << endl;
throw out_of_range("Need two parameters for -.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
p2 = Sptr->params.top();
Sptr->params.pop();
if (p1.m_value == 1 || p2.m_value == 1)
{
Sptr->params.push(Token(INTEGER, 1, ""));
}
else
{
Sptr->params.push(Token(INTEGER, 0, ""));
}
}
void Sally::doNOT(Sally *Sptr)
{
Token p1;
if (Sptr->params.size() < 1) {
cout << "Need two parameters for -." << endl;
throw out_of_range("Need one parameters for -.");
}
p1 = Sptr->params.top();
Sptr->params.pop();
if (p1.m_value == 0)
{
Sptr->params.push(Token(INTEGER, 1, ""));
}
else
{
Sptr->params.push(Token(INTEGER, 0, ""));
}
}
/*
Finally, these are the operations that you have to add to the Sally FORTH interpreter :
Stack operations : DUP DROP SWAP ROT
Variable operations : SET @ !
Comparison operations : < <= == != >= >
Logic operations : AND OR NOT
If statements : IFTHEN ELSE ENDIF
Loop construct : DO UNTIL
*/