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break; case IF: execIf(); break; case FOR: execFor(); break; case NEXT: next(); break; case INPUT: input(); break; case GOSUB: gosub(); break; case RETURN: greturn(); break; case END: return; } } while (!token.equals(EOP)); } // Find all labels. private void scanLabels() throws InterpreterException { int i; Object result; // See if the first token in the file is a label. getToken(); if(tokType==NUMBER) labelTable.put(token, new Integer(progIdx)); findEOL(); do { getToken(); if(tokType==NUMBER) {// must be a line number result = labelTable.put(token, new Integer(progIdx)); if(result != null) handleErr(DUPLABEL);
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} // If not on a blank line, find next line. if(kwToken != EOL) findEOL(); } while(!token.equals(EOP)); progIdx = 0; // reset index to start of program } // Find the start of the next line. private void findEOL() { while(progIdx < prog.length && prog[progIdx] != '\n') ++progIdx; if(progIdx < prog.length) progIdx++; } // Assign a variable a value. private void assignment() throws InterpreterException { int var; double value; char vname; // Get the variable name. getToken(); vname = token.charAt(0); if(!Character.isLetter(vname)) { handleErr(NOTVAR); return; } // Convert to index into variable table. var = (int) Character.toUpperCase(vname) - 'A'; // Get the equal sign. getToken(); if(!token.equals("=")) { handleErr(EQUALEXPECTED); return; } // Get the value to assign. value = evaluate();
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// Assign the value. vars[var] = value; } // Execute a simple version of the PRINT statement. private void print() throws InterpreterException { double result; int len=0, spaces; String lastDelim = ""; do { getToken(); // get next list item if(kwToken==EOL || token.equals(EOP)) break; if(tokType==QUOTEDSTR) { // is string System.out.print(token); len += token.length(); getToken(); } else { // is expression putBack(); result = evaluate(); getToken(); System.out.print(result); // Add length of output to running total. Double t = new Double(result); len += t.toString().length(); // save length } lastDelim = token; // If comma, move to next tab stop. if(lastDelim.equals(",")) { // compute number of spaces to move to next tab spaces = 8 - (len % 8); len += spaces; // add in the tabbing position while(spaces != 0) { System.out.print(" "); spaces--; } } else if(token.equals(";")) { System.out.print(" "); len++;
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} else if(kwToken != EOL && !token.equals(EOP)) handleErr(SYNTAX); } while (lastDelim.equals(";") || lastDelim.equals(",")); if(kwToken==EOL || token.equals(EOP)) { if(!lastDelim.equals(";") && !lastDelim.equals(",")) System.out.println(); } else handleErr(SYNTAX); } // Execute a GOTO statement. private void execGoto() throws InterpreterException { Integer loc; getToken(); // get label to go to // Find the location of the label. loc = (Integer) labelTable.get(token); if(loc == null) handleErr(UNDEFLABEL); // label not defined else // start program running at that loc progIdx = loc.intValue(); } // Execute an IF statement. private void execIf() throws InterpreterException { double result; result = evaluate(); // get value of expression /* If the result is true (non-zero), process target of IF. Otherwise move on to next line in the program. */ if(result != 0.0) { getToken(); if(kwToken != THEN) { handleErr(THENEXPECTED); return; } // else, target statement will be executed }
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else findEOL(); // find start of next line } // Execute a FOR loop. private void execFor() throws InterpreterException { ForInfo stckvar = new ForInfo(); double value; char vname; getToken(); // read the control variable vname = token.charAt(0); if(!Character.isLetter(vname)) { handleErr(NOTVAR); return; } // Save index of control var. stckvar.var = Character.toUpperCase(vname) - 'A'; getToken(); // read the equal sign if(token.charAt(0) != '=') { handleErr(EQUALEXPECTED); return; } value = evaluate(); // get initial value vars[stckvar.var] = value; getToken(); // read and discard the TO if(kwToken != TO) handleErr(TOEXPECTED); stckvar.target = evaluate(); // get target value /* If loop can execute at least once, push info on stack. */ if(value >= vars[stckvar.var]) { stckvar.loc = progIdx; fStack.push(stckvar); } else // otherwise, skip loop code altogether while(kwToken != NEXT) getToken(); }
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