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3: Implementing Language Interpreters in Java
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// Execute a NEXT statement. private void next() throws InterpreterException { ForInfo stckvar; try { // Retrieve info for this For loop. stckvar = (ForInfo) fStack.pop(); vars[stckvar.var]++; // increment control var // If done, return. if(vars[stckvar.var] > stckvar.target) return; // Otherwise, restore the info. fStack.push(stckvar); progIdx = stckvar.loc; // loop } catch(EmptyStackException exc) { handleErr(NEXTWITHOUTFOR); } } // Execute a simple form of INPUT. private void input() throws InterpreterException { int var; double val = 0.0; String str; BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); getToken(); // see if prompt string is present if(tokType == QUOTEDSTR) { // if so, print it and check for comma System.out.print(token); getToken(); if(!token.equals(",")) handleErr(SYNTAX); getToken(); } else System.out.print(" "); // otherwise, prompt with // get the input var var = Character.toUpperCase(token.charAt(0)) - 'A'; try {
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str = br.readLine(); val = Double.parseDouble(str); // read the value } catch (IOException exc) { handleErr(INPUTIOERROR); } catch (NumberFormatException exc) { /* You might want to handle this error differently than the other interpreter errors. */ System.out.println("Invalid input."); } vars[var] = val; // store it } // Execute a GOSUB. private void gosub() throws InterpreterException { Integer loc; getToken(); // Find the label to call. loc = (Integer) labelTable.get(token); if(loc == null) handleErr(UNDEFLABEL); // label not defined else { // Save place to return to. gStack.push(new Integer(progIdx)); // Start program running at that loc. progIdx = loc.intValue(); } } // Return from GOSUB. private void greturn() throws InterpreterException { Integer t; try { // Restore program index. t = (Integer) gStack.pop(); progIdx = t.intValue(); } catch(EmptyStackException exc) {
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3: Implementing Language Interpreters in Java
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handleErr(RETURNWITHOUTGOSUB); } } // **************** Expression Parser **************** // Parser entry point. private double evaluate() throws InterpreterException { double result = 0.0; getToken(); if(token.equals(EOP)) handleErr(NOEXP); // no expression present // Parse and evaluate the expression. result = evalExp1(); putBack(); return result; } // Process relational operators. private double evalExp1() throws InterpreterException { double l_temp, r_temp, result; char op; result = evalExp2(); // If at end of program, return. if(token.equals(EOP)) return result; op = token.charAt(0); if(isRelop(op)) { l_temp = result; getToken(); r_temp = evalExp1(); switch(op) { // perform the relational operation case '<': if(l_temp < r_temp) result = 1.0; else result = 0.0; break;
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case LE: if(l_temp <= r_temp) result = 1.0; else result = 0.0; break; case '>': if(l_temp > r_temp) result = 1.0; else result = 0.0; break; case GE: if(l_temp >= r_temp) result = 1.0; else result = 0.0; break; case '=': if(l_temp == r_temp) result = 1.0; else result = 0.0; break; case NE: if(l_temp != r_temp) result = 1.0; else result = 0.0; break; } } return result; } // Add or subtract two terms. private double evalExp2() throws InterpreterException { char op; double result; double partialResult; result = evalExp3(); while((op = token.charAt(0)) == '+' || op == '-') { getToken(); partialResult = evalExp3(); switch(op) { case '-': result = result - partialResult; break; case '+': result = result + partialResult; break; }
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} return result; } // Multiply or divide two factors. private double evalExp3() throws InterpreterException { char op; double result; double partialResult; result = evalExp4(); while((op = token.charAt(0)) == '*' || op == '/' || op == '%') { getToken(); partialResult = evalExp4(); switch(op) { case '*': result = result * partialResult; break; case '/': if(partialResult == 0.0) handleErr(DIVBYZERO); result = result / partialResult; break; case '%': if(partialResult == 0.0) handleErr(DIVBYZERO); result = result % partialResult; break; } } return result; } // Process an exponent. private double evalExp4() throws InterpreterException { double result; double partialResult; double ex; int t; result = evalExp5();
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if(token.equals("^")) { getToken(); partialResult = evalExp4(); ex = result; if(partialResult == 0.0) { result = 1.0; } else for(t=(int)partialResult-1; t > 0; t--) result = result * ex; } return result; } // Evaluate a unary + or -. private double evalExp5() throws InterpreterException { double result; String op; op = ""; if((tokType == DELIMITER) && token.equals("+") || token.equals("-")) { op = token; getToken(); } result = evalExp6(); if(op.equals("-")) result = -result; return result; } // Process a parenthesized expression. private double evalExp6() throws InterpreterException { double result; if(token.equals("(")) { getToken(); result = evalExp2(); if(!token.equals(")")) handleErr(UNBALPARENS); getToken(); } else result = atom();
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