more

344/calculatorProject/.gitignore

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+Java/

344/calculatorProject/calculator.plcc

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+skip WHITESPACE '\s+'
+
+token OP '\+|-'
+token MOP '\*|/'
+token NUM '[0-9]+'
+
+%
+
+<start> ::= <exp>
+<exp> ::= <mult> <exprest>
+<exprest> **= <OP> <mult>
+<mult> ::= <value> <multrest>
+<multrest> **= <MOP> <value>
+<value> ::= <NUM>
+
+%
+
+Start
+%%{
+
+   public void $run() {
+      System.out.println(exp.calculate());
+   }
+
+%%}
+
+Exp
+%%{
+
+   public int calculate() {
+      int x = mult.calculate();
+      return exprest.calculate(x);
+   }
+
+%%}
+
+Exprest
+%%{
+
+   public int calculate(int resultSoFar) {
+      Iterator<Token> opIt = opList.iterator();
+      Iterator<Mult> multIt = multList.iterator();
+
+      while(opIt.hasNext()) {
+         String op = opIt.next().toString();
+	 int n = multIt.next().calculate();
+
+         switch(op) {
+	    case "+": resultSoFar += n; break;
+	    case "-": resultSoFar -= n; break;
+	 }
+
+      }
+
+      return resultSoFar;
+   }
+
+%%}
+
+Mult
+%%{
+
+   public int calculate() {
+      int x = value.getValue();
+      return multrest.calculate(x);
+   }
+
+%%}
+
+Multrest
+%%{
+
+   public int calculate(int resultSoFar) {
+      Iterator<Token> mopIt = mopList.iterator();
+      Iterator<Value> valueIt = valueList.iterator();
+
+      while(mopIt.hasNext()) {
+         String op = mopIt.next().toString();
+	 int n = valueIt.next().getValue();
+
+         switch(op) {
+	    case "*": resultSoFar *= n; break;
+	    case "/": resultSoFar /= n; break;
+	 }
+
+      }
+
+      return resultSoFar;
+   }
+
+%%}
+
+Value
+%%{
+
+   public int getValue() {
+      return Integer.parseInt(num.toString());
+   }
+
+%%}

344/calculatorProject/input

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+6*7