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996
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1 // This software is Public Domain.
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2
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3 import java.util.Stack;
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4 import java.io.*;
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5
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6 public class Operator {
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7
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8 char operator;
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9 Operator nextOperator, loopOperator = null;
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10 boolean jump = false;
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11
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12 public static InputStream in;
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13 public static OutputStream out;
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14 public static PrintStream err;
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15
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16 public static Stack loopStack = new Stack();
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17 public static GlyphoStack stack = new GlyphoStack();
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18
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19 public Operator(char operator){
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20 this.operator = operator;
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21 if (operator == '[') loopStack.push(this);
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22 if (operator == ']') {
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23 loopOperator = (Operator)(loopStack.pop());
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24 loopOperator.setLoopOperator(this);
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25 }
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26 }
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27
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28 public void execute() {
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29 execute(operator);
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30 }
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31
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32 protected void execute(char op) {
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33 switch(op) {
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34 case 'n': break;
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35 case 'i': try {
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36 int b = in.read();
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37 if (b < 0) stack.push(0);
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38 else stack.push(b);
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39 }catch (IOException e) { err.println(e); }
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40 break;
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41 case 'o': try {
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42 out.write(stack.pop());
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43 out.flush();
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44 }catch (IOException e) { err.println(e); }
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45 break;
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46 case 'd': stack.push(stack.peek());
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47 break;
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48 case '\\':int v1 = stack.pop();
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49 int v2 = stack.pop();
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50 stack.push(v1);
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51 stack.push(v2);
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52 break;
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53 case '>': stack.pushBottom(stack.pop());
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54 break;
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55 case '<': stack.push(stack.popBottom());
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56 break;
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57 case '!': stack.pop();
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58 break;
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59 case '1': stack.push(1);
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60 break;
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61 case '+': stack.push(stack.pop() + stack.pop());
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62 break;
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63 case '-': stack.push(-stack.pop());
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64 break;
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65 case '*': stack.push(stack.pop() * stack.pop());
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66 break;
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67 case 'e': execute(GlyphoInterpreter.getOperator(new int[] {stack.pop(), stack.pop(), stack.pop(), stack.pop()}));
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68 break;
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69 case '[': jump = (stack.peek() == 0);
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70 break;
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71 case ']': jump = (stack.peek() != 0);
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72 break;
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73 //Debug operator which dumps the stack:
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74 case '&': if (! stack.empty()) err.println(stack.toString());
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75 break;
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76 }
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77 }
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78
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79 public void setLoopOperator(Operator loopOperator) {
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80 this.loopOperator = loopOperator;
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81 }
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82
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83 public Operator next() {
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84 return nextOperator;
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85 }
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86
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87 public void setNext(Operator next){
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88 nextOperator = next;
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89 }
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90
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91 public Operator conditionalNext(){
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92 if ((loopOperator != null) && (jump)) {
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93 return loopOperator;
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94 }else{
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95 return nextOperator;
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96 }
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97 }
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98
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99 } |
