1 /* 2 * Copyright (C) 2014 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef Character_h 32 #define Character_h 33 34 #include "platform/PlatformExport.h" 35 #include "platform/text/TextDirection.h" 36 #include "platform/text/TextPath.h" 37 #include "wtf/HashSet.h" 38 #include "wtf/text/WTFString.h" 39 #include "wtf/unicode/CharacterNames.h" 40 41 namespace blink { 42 43 class PLATFORM_EXPORT Character { 44 public: characterRangeCodePath(const LChar *,unsigned)45 static CodePath characterRangeCodePath(const LChar*, unsigned) { return SimplePath; } 46 static CodePath characterRangeCodePath(const UChar*, unsigned len); 47 48 static bool isCJKIdeograph(UChar32); 49 static bool isCJKIdeographOrSymbol(UChar32); 50 51 static unsigned expansionOpportunityCount(const LChar*, size_t length, TextDirection, bool& isAfterExpansion); 52 static unsigned expansionOpportunityCount(const UChar*, size_t length, TextDirection, bool& isAfterExpansion); 53 treatAsSpace(UChar c)54 static bool treatAsSpace(UChar c) { return c == space || c == characterTabulation || c == newlineCharacter || c == noBreakSpace; } treatAsZeroWidthSpace(UChar c)55 static bool treatAsZeroWidthSpace(UChar c) { return treatAsZeroWidthSpaceInComplexScript(c) || c == 0x200c || c == 0x200d; } treatAsZeroWidthSpaceInComplexScript(UChar c)56 static bool treatAsZeroWidthSpaceInComplexScript(UChar c) { return c < 0x20 || (c >= 0x7F && c < 0xA0) || c == softHyphen || c == zeroWidthSpace || (c >= 0x200e && c <= 0x200f) || (c >= 0x202a && c <= 0x202e) || c == zeroWidthNoBreakSpace || c == objectReplacementCharacter; } 57 static bool canReceiveTextEmphasis(UChar32); 58 normalizeSpaces(UChar character)59 static inline UChar normalizeSpaces(UChar character) 60 { 61 if (treatAsSpace(character)) 62 return space; 63 64 if (treatAsZeroWidthSpace(character)) 65 return zeroWidthSpace; 66 67 return character; 68 } 69 isNormalizedCanvasSpaceCharacter(UChar c)70 static inline bool isNormalizedCanvasSpaceCharacter(UChar c) 71 { 72 // According to specification all space characters should be replaced with 0x0020 space character. 73 // http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#text-preparation-algorithm 74 // The space characters according to specification are : U+0020, U+0009, U+000A, U+000C, and U+000D. 75 // http://www.whatwg.org/specs/web-apps/current-work/multipage/common-microsyntaxes.html#space-character 76 // This function returns true for 0x000B also, so that this is backward compatible. 77 // Otherwise, the test LayoutTests/canvas/philip/tests/2d.text.draw.space.collapse.space.html will fail 78 return c == 0x0009 || (c >= 0x000A && c <= 0x000D); 79 } 80 81 static String normalizeSpaces(const LChar*, unsigned length); 82 static String normalizeSpaces(const UChar*, unsigned length); 83 84 private: 85 Character(); 86 }; 87 88 } // namespace blink 89 90 #endif 91