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/*
Input is e.g. "32p 8c". We want to get out the 2 operators.
Then we apply a "puzzler" which tries to combine the operators in a useful way.

// Operators

<int> p = scaleToHeight : IBWntegralImage -> BWImage
<int> c = posterize : BWImage -> BWImage

// Juxtaposition of operators

_ _ = juxtapose : Op, Op -> Op [left-assoc]
*/

sclass GazelleVParser<T> > SimpleLeftToRightParser {
  CalculatedFieldIndexedList<GAbstractOperator<T>, S> operators = new(op -> op.name);

  *(S text) { super(text); set caseInsensitive; }
  
  void addOperators(Iterable<? extends GAbstractOperator<T>> l) {
    addAll(operators, l);
  }
  
  void parse {
    while (mainLoop()) {}
    
    if (isInteger(token))
      parsed.add(parseInt(token));
      continue;
    }
    
    parsed.add(findOp(tpp()));
  }
  
  GAbstractOperator<T> findOp(S name) {
    var ops = operators.getAllByKey(name);
    if (empty(ops))
      warn("Unknown operator: " + name);
    if (l(ops) > 1)
      warn("Multiple operator definitions (please use GPolymorphicOperator instead): " + name);
    ret first(ops);
  }
}