/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

#ifndef DateTimeFormat_h
#define DateTimeFormat_h

#include "platform/PlatformExport.h"
#include "platform/heap/Handle.h"
#include "wtf/Allocator.h"
#include "wtf/Forward.h"

namespace blink {

// DateTimeFormat parses date time format defined in Unicode Technical
// standard 35, Locale Data Markup Language (LDML)[1].
// [1] LDML http://unicode.org/reports/tr35/tr35-6.html#Date_Format_Patterns
class PLATFORM_EXPORT DateTimeFormat {
  STATIC_ONLY(DateTimeFormat);

 public:
  enum FieldType {
    FieldTypeInvalid,
    FieldTypeLiteral,

    // Era: AD
    FieldTypeEra = 'G',

    // Year: 1996
    FieldTypeYear = 'y',
    FieldTypeYearOfWeekOfYear = 'Y',
    FieldTypeExtendedYear = 'u',

    // Quater: Q2
    FieldTypeQuater = 'Q',
    FieldTypeQuaterStandAlone = 'q',

    // Month: September
    FieldTypeMonth = 'M',
    FieldTypeMonthStandAlone = 'L',

    // Week: 42
    FieldTypeWeekOfYear = 'w',
    FieldTypeWeekOfMonth = 'W',

    // Day: 12
    FieldTypeDayOfMonth = 'd',
    FieldTypeDayOfYear = 'D',
    FieldTypeDayOfWeekInMonth = 'F',
    FieldTypeModifiedJulianDay = 'g',

    // Week Day: Tuesday
    FieldTypeDayOfWeek = 'E',
    FieldTypeLocalDayOfWeek = 'e',
    FieldTypeLocalDayOfWeekStandAlon = 'c',

    // Period: AM or PM
    FieldTypePeriod = 'a',

    // Hour: 7
    FieldTypeHour12 = 'h',
    FieldTypeHour23 = 'H',
    FieldTypeHour11 = 'K',
    FieldTypeHour24 = 'k',

    // Minute: 59
    FieldTypeMinute = 'm',

    // Second: 12
    FieldTypeSecond = 's',
    FieldTypeFractionalSecond = 'S',
    FieldTypeMillisecondsInDay = 'A',

    // Zone: PDT
    FieldTypeZone = 'z',
    FieldTypeRFC822Zone = 'Z',
    FieldTypeNonLocationZone = 'v',
  };

  class TokenHandler {
    STACK_ALLOCATED();
    WTF_MAKE_NONCOPYABLE(TokenHandler);

   public:
    TokenHandler() {}
    virtual ~TokenHandler() {}
    virtual void visitField(FieldType, int numberOfPatternCharacters) = 0;
    virtual void visitLiteral(const String&) = 0;
  };

  // Returns true if succeeded, false if failed.
  static bool parse(const String&, TokenHandler&);
  static void quoteAndappend(const String&, StringBuilder&);
};

}  // namespace blink

#endif  // DateTimeFormat_h
