void processLine(string line, Program & program, EvalState & state) {
TokenScanner scanner;
scanner.ignoreWhitespace();
scanner.scanNumbers();
scanner.setInput(line);
string str=scanner.nextToken();
if (scanner.getTokenType(str)==NUMBER) {
int lineNumber=stringToInteger(str);
string token=scanner.nextToken();
scanner.saveToken(token);
if (token!="") {
program.addSourceLine(lineNumber, line);
program.setParsedStatement(lineNumber, parseStatement(scanner));
}
else {
program.removeSourceLine(lineNumber);
}
}
else if (str=="LIST") {
for (int i=program.getFirstLineNumber(); i!=-1; i=program.getNextLineNumber(i)) {
cout << program.getSourceLine(i)<<endl;
}
}
else if (str=="CLEAR") {
program.clear();
}
else if(str=="QUIT") exit(0);
else if (str=="HELP") cout<<"This is a minimal BASIC interpreter."<<endl;
else if (str=="RUN") {
int currentLine=program.getFirstLineNumber();
state.setCurrentLine(currentLine);
while (currentLine!=-1) {
program.getParsedStatement(currentLine)->execute(state);
if(currentLine!=state.getCurrentLine()) {
currentLine=state.getCurrentLine();
}
else {
currentLine=program.getNextLineNumber(currentLine);
state.setCurrentLine(currentLine);
}
}
}
}
void processLine(string line, Program & program, EvalState & state) {
TokenScanner scanner;
scanner.ignoreWhitespace();
scanner.scanNumbers();
scanner.setInput(line);
// Expression *exp = parseExp(scanner);
// int value = exp->eval(state);
// cout << value << endl;
// delete exp;
if (!scanner.hasMoreTokens()) {
return;
}
string firstToken = toUpperCase(scanner.nextToken());
if (firstToken == "RUN") {
runProgram(program, state);
}
else if (firstToken == "QUIT") {
exit(0);
}
else if (firstToken == "HELP") {
dspHelp();
}
else if (firstToken == "CLEAR") {
program.clear();
}
else if (firstToken == "LIST") {
listCmd(program);
}
else if (firstToken == "INPUT" || firstToken == "PRINT" || firstToken == "LET") {
scanner.saveToken(firstToken);
Statement * stmt = parseStatement(scanner);
stmt->execute(state);
delete stmt;
}
else {
int lineNumber = stringToInteger(firstToken);
if (!scanner.hasMoreTokens()) {
program.removeSourceLine(lineNumber);
}
else {
int length = firstToken.length();
string source = line.substr(length);
program.addSourceLine(lineNumber, source);
Statement * stmt = parseStatement(scanner);
program.setParsedStatement(lineNumber, stmt);
}
}
}