/*
 * Copyright (C) 2007 Apple Inc.  All rights reserved.
 * Copyright (C) 2008 Tony Chang <idealisms@gmail.com>
 *
 * 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. 
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE 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 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.
 */

#include "config.h"
#include "SmartReplace.h"

#if !PLATFORM(CF) && USE(ICU_UNICODE)
#include "PlatformString.h"
#include <unicode/uset.h>
#include <wtf/Assertions.h>

namespace WebCore {

static void addAllCodePoints(USet* smartSet, const String& string) {
    const UChar* characters = string.characters();
    for (size_t i = 0; i < string.length(); i++)
        uset_add(smartSet, characters[i]);
}

// This is mostly a port of the code in WebCore/editing/SmartReplaceCF.cpp
// except we use icu in place of CoreFoundations character classes.
static USet* getSmartSet(bool isPreviousCharacter)
{
    static USet* preSmartSet = NULL; 
    static USet* postSmartSet = NULL;
    USet* smartSet = isPreviousCharacter ? preSmartSet : postSmartSet;
    if (!smartSet) {
        // Whitespace and newline (kCFCharacterSetWhitespaceAndNewline)
        UErrorCode ec = U_ZERO_ERROR;
        String whitespaceAndNewline = "[[:WSpace:] [\\u000A\\u000B\\u000C\\u000D\\u0085]]";
        smartSet = uset_openPattern(whitespaceAndNewline.characters(), whitespaceAndNewline.length(), &ec);
        ASSERT(U_SUCCESS(ec));

        // CJK ranges
        uset_addRange(smartSet, 0x1100, 0x1100 + 256); // Hangul Jamo (0x1100 - 0x11FF)
        uset_addRange(smartSet, 0x2E80, 0x2E80 + 352); // CJK & Kangxi Radicals (0x2E80 - 0x2FDF)
        uset_addRange(smartSet, 0x2FF0, 0x2FF0 + 464); // Ideograph Descriptions, CJK Symbols, Hiragana, Katakana, Bopomofo, Hangul Compatibility Jamo, Kanbun, & Bopomofo Ext (0x2FF0 - 0x31BF)
        uset_addRange(smartSet, 0x3200, 0x3200 + 29392); // Enclosed CJK, CJK Ideographs (Uni Han & Ext A), & Yi (0x3200 - 0xA4CF)
        uset_addRange(smartSet, 0xAC00, 0xAC00 + 11183); // Hangul Syllables (0xAC00 - 0xD7AF)
        uset_addRange(smartSet, 0xF900, 0xF900 + 352); // CJK Compatibility Ideographs (0xF900 - 0xFA5F)
        uset_addRange(smartSet, 0xFE30, 0xFE30 + 32); // CJK Compatibility From (0xFE30 - 0xFE4F)
        uset_addRange(smartSet, 0xFF00, 0xFF00 + 240); // Half/Full Width Form (0xFF00 - 0xFFEF)
        uset_addRange(smartSet, 0x20000, 0x20000 + 0xA6D7); // CJK Ideograph Exntension B
        uset_addRange(smartSet, 0x2F800, 0x2F800 + 0x021E); // CJK Compatibility Ideographs (0x2F800 - 0x2FA1D)

        if (isPreviousCharacter) {
            addAllCodePoints(smartSet, "([\"\'#$/-`{");
            preSmartSet = smartSet;
        } else {
            addAllCodePoints(smartSet, ")].,;:?\'!\"%*-/}");

            // Punctuation (kCFCharacterSetPunctuation)
            UErrorCode ec = U_ZERO_ERROR;
            String punctuationClass = "[:P:]";
            USet* icuPunct = uset_openPattern(punctuationClass.characters(), punctuationClass.length(), &ec);
            ASSERT(U_SUCCESS(ec));
            uset_addAll(smartSet, icuPunct);
            uset_close(icuPunct);

            postSmartSet = smartSet;
        }
    }
    return smartSet;
}

bool isCharacterSmartReplaceExempt(UChar32 c, bool isPreviousCharacter)
{
    return uset_contains(getSmartSet(isPreviousCharacter), c);
}

}

#endif // !PLATFORM(CF) && USE(ICU_UNICODE)