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/*
* Copyright (C) 2014 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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 Character_h
#define Character_h
#include "platform/PlatformExport.h"
#include "platform/text/TextDirection.h"
#include "platform/text/TextPath.h"
#include "platform/text/TextRun.h"
#include "wtf/HashSet.h"
#include "wtf/text/CharacterNames.h"
#include "wtf/text/WTFString.h"
namespace blink {
class PLATFORM_EXPORT Character {
public:
static CodePath characterRangeCodePath(const LChar*, unsigned) { return SimplePath; }
static CodePath characterRangeCodePath(const UChar*, unsigned len);
static inline bool isInRange(UChar32 character, UChar32 lowerBound, UChar32 upperBound)
{
return character >= lowerBound && character <= upperBound;
}
static inline bool isUnicodeVariationSelector(UChar32 character)
{
// http://www.unicode.org/Public/UCD/latest/ucd/StandardizedVariants.html
return isInRange(character, 0x180B, 0x180D) // MONGOLIAN FREE VARIATION SELECTOR ONE to THREE
|| isInRange(character, 0xFE00, 0xFE0F) // VARIATION SELECTOR-1 to 16
|| isInRange(character, 0xE0100, 0xE01EF); // VARIATION SELECTOR-17 to 256
}
static bool isCJKIdeograph(UChar32);
static bool isCJKIdeographOrSymbol(UChar32);
static unsigned expansionOpportunityCount(const LChar*, size_t length, TextDirection, bool& isAfterExpansion, const TextJustify);
static unsigned expansionOpportunityCount(const UChar*, size_t length, TextDirection, bool& isAfterExpansion, const TextJustify);
static bool isUprightInMixedVertical(UChar32 character);
static bool treatAsSpace(UChar c)
{
return c == spaceCharacter
|| c == tabulationCharacter
|| c == newlineCharacter
|| c == noBreakSpaceCharacter;
}
static bool treatAsZeroWidthSpace(UChar c)
{
return treatAsZeroWidthSpaceInComplexScript(c)
|| c == zeroWidthNonJoinerCharacter
|| c == zeroWidthJoinerCharacter;
}
static bool treatAsZeroWidthSpaceInComplexScript(UChar c)
{
return c < 0x20 // ASCII Control Characters
|| (c >= 0x7F && c < 0xA0) // ASCII Delete .. No-break spaceCharacter
|| c == softHyphenCharacter
|| c == zeroWidthSpaceCharacter
|| (c >= leftToRightMarkCharacter && c <= rightToLeftMarkCharacter)
|| (c >= leftToRightEmbedCharacter && c <= rightToLeftOverrideCharacter)
|| c == zeroWidthNoBreakSpaceCharacter
|| c == objectReplacementCharacter;
}
static bool canReceiveTextEmphasis(UChar32);
static bool isModifier(UChar32 c)
{
return c >= 0x1F3FB && c <= 0x1F3FF;
}
static inline UChar normalizeSpaces(UChar character)
{
if (treatAsSpace(character))
return spaceCharacter;
if (treatAsZeroWidthSpace(character))
return zeroWidthSpaceCharacter;
return character;
}
static inline bool isNormalizedCanvasSpaceCharacter(UChar c)
{
// According to specification all space characters should be replaced with 0x0020 space character.
// http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#text-preparation-algorithm
// The space characters according to specification are : U+0020, U+0009, U+000A, U+000C, and U+000D.
// http://www.whatwg.org/specs/web-apps/current-work/multipage/common-microsyntaxes.html#space-character
// This function returns true for 0x000B also, so that this is backward compatible.
// Otherwise, the test LayoutTests/canvas/philip/tests/2d.text.draw.space.collapse.space.html will fail
return c == 0x0009 || (c >= 0x000A && c <= 0x000D);
}
static String normalizeSpaces(const LChar*, unsigned length);
static String normalizeSpaces(const UChar*, unsigned length);
private:
Character();
};
} // namespace blink
#endif
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