/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef TRANSFRMX_EXPRRESULT_H
#define TRANSFRMX_EXPRRESULT_H

#include "nsString.h"
#include "txCore.h"
#include "txResultRecycler.h"

/*
 * ExprResult
 *
 * Classes Represented:
 * BooleanResult, ExprResult, NumberResult, StringResult
 *
 * Note: for NodeSet, see NodeSet.h
 */

class txAExprResult {
 public:
  friend class txResultRecycler;

  // Update txLiteralExpr::getReturnType and sTypes in txEXSLTFunctions.cpp if
  // this enum is changed.
  enum ResultType {
    NODESET = 0,
    BOOLEAN,
    NUMBER,
    STRING,
    RESULT_TREE_FRAGMENT
  };

  explicit txAExprResult(txResultRecycler* aRecycler) : mRecycler(aRecycler) {}
  virtual ~txAExprResult() = default;

  void AddRef() {
    ++mRefCnt;
    NS_LOG_ADDREF(this, mRefCnt, "txAExprResult", sizeof(*this));
  }

  void Release();  // Implemented in txResultRecycler.cpp

  /**
   * Returns the type of ExprResult represented
   * @return the type of ExprResult represented
   **/
  virtual short getResultType() = 0;

  /**
   * Creates a String representation of this ExprResult
   * @param aResult the destination string to append the String
   *                representation to.
   **/
  virtual void stringValue(nsString& aResult) = 0;

  /**
   * Returns a pointer to the stringvalue if possible. Otherwise null is
   * returned.
   */
  virtual const nsString* stringValuePointer() = 0;

  /**
   * Converts this ExprResult to a Boolean (bool) value
   * @return the Boolean value
   **/
  virtual bool booleanValue() = 0;

  /**
   * Converts this ExprResult to a Number (double) value
   * @return the Number value
   **/
  virtual double numberValue() = 0;

 private:
  nsAutoRefCnt mRefCnt;
  RefPtr<txResultRecycler> mRecycler;
};

#define TX_DECL_EXPRRESULT                               \
  virtual short getResultType() override;                \
  virtual void stringValue(nsString& aString) override;  \
  virtual const nsString* stringValuePointer() override; \
  virtual bool booleanValue() override;                  \
  virtual double numberValue() override;

class BooleanResult : public txAExprResult {
 public:
  explicit BooleanResult(bool aValue);

  TX_DECL_EXPRRESULT

 private:
  bool value;
};

class NumberResult : public txAExprResult {
 public:
  NumberResult(double aValue, txResultRecycler* aRecycler);

  TX_DECL_EXPRRESULT

  double value;
};

class StringResult : public txAExprResult {
 public:
  explicit StringResult(txResultRecycler* aRecycler);
  StringResult(const nsAString& aValue, txResultRecycler* aRecycler);

  TX_DECL_EXPRRESULT

  nsString mValue;
};

#endif