Improve performance of Character::isCJKIdeographOrSymbol by using trie tree

third_party/WebKit/Source/platform/fonts/Character.cpp

Index: third_party/WebKit/Source/platform/fonts/Character.cpp
diff --git a/third_party/WebKit/Source/platform/fonts/Character.cpp b/third_party/WebKit/Source/platform/fonts/Character.cpp
index b0dc240d950286ad8b231606f65e639ec169f338..5b527cd234b7cb2870733908a7c8d0ae8da6a3a8 100644
--- a/third_party/WebKit/Source/platform/fonts/Character.cpp
+++ b/third_party/WebKit/Source/platform/fonts/Character.cpp
@@ -33,7 +33,10 @@
 #include "wtf/StdLibExtras.h"
 #include "wtf/text/StringBuilder.h"
 #include <algorithm>
+#include <unicode/uobject.h>
 #include <unicode/uscript.h>
+#define MUTEX_H

[drott, 2016/01/14 12:10:53]

Why is this needed?

[kojii, 2016/01/14 15:34:33]

ICU fails to compile without this, at least on Windows. I'll investigate a bit
more if this is because of our build environment or a general bug in ICU, and if
the latter, post to ICU ML.

+#include <utrie2.h>
 
 using namespace WTF;
 using namespace Unicode;
@@ -61,6 +64,273 @@ static const UChar32 cjkIsolatedSymbolsArray[] = {
     0x1F100
 };
 
+static const UChar32 cjkIdeographRanges[] = {
+    // CJK Radicals Supplement and Kangxi Radicals.
+    0x2E80, 0x2FDF,
+    // CJK Strokes.
+    0x31C0, 0x31EF,
+    // CJK Unified Ideographs Extension A.
+    0x3400, 0x4DBF,
+    // The basic CJK Unified Ideographs block.
+    0x4E00, 0x9FFF,
+    // CJK Compatibility Ideographs.
+    0xF900, 0xFAFF,
+    // CJK Unified Ideographs Extension B.
+    0x20000, 0x2A6DF,
+    // CJK Unified Ideographs Extension C.
+    // CJK Unified Ideographs Extension D.
+    0x2A700, 0x2B81F,
+    // CJK Compatibility Ideographs Supplement.
+    0x2F800, 0x2FA1F
+};
+
+static const UChar32 cjkSymbolRanges[] = {
+    0x2156, 0x215A,
+    0x2160, 0x216B,
+    0x2170, 0x217B,
+    0x23BE, 0x23CC,
+    0x2460, 0x2492,
+    0x249C, 0x24FF,
+    0x25CE, 0x25D3,
+    0x25E2, 0x25E6,
+    0x2600, 0x2603,
+    0x2660, 0x266F,
+    0x2672, 0x267D,

[drott, 2016/01/14 12:10:53]

Could you perhaps include

// Emoji HEAVY HEART EXCLAMATION MARK ORNAMENT..HEAVY BLACK HEART
// Needed in order not to break Emoji heart-kiss sequences in
// CachingWordShapeIterator.
// cmp. http://www.unicode.org/emoji/charts/emoji-zwj-sequences.html
0x2763, 0x2764,

here already in order to avoid conflicts with my emoji ZWJ sequences patch?

[kojii, 2016/01/14 15:34:33]

Done.

+    0x2776, 0x277F,
+    // Ideographic Description Characters, with CJK Symbols and Punctuation, excluding 0x3030.

[drott, 2016/01/14 12:10:53]

I know that this is previous code in a way. However, as we're touching it here
and Blink is converging with Chromium's style. Could you ensure an 80 column
limit in the whole file?

[kojii, 2016/01/14 15:34:33]

Wasn't aware that 80 column limit is also coming.

Done for all changed lines. Didn't bother with lines without changes, sorry,
because Character::characterRangeCodePath() is going to be removed soon anyway.

+    // Then Hiragana 0x3040 .. 0x309F, Katakana 0x30A0 .. 0x30FF, Bopomofo 0x3100 .. 0x312F
+    0x2FF0, 0x302F,
+    0x3031, 0x312F,
+    // More Bopomofo and Bopomofo Extended 0x31A0 .. 0x31BF
+    0x3190, 0x31BF,
+    // Enclosed CJK Letters and Months (0x3200 .. 0x32FF).
+    // CJK Compatibility (0x3300 .. 0x33FF).
+    0x3200, 0x33FF,
+    0xF860, 0xF862,
+    // CJK Compatibility Forms.
+    0xFE30, 0xFE4F,
+    // Halfwidth and Fullwidth Forms
+    // Usually only used in CJK
+    0xFF00, 0xFF0C,
+    0xFF0E, 0xFF1A,
+    0xFF1F, 0xFFEF,
+    // Emoji.
+    0x1F110, 0x1F129,
+    0x1F130, 0x1F149,
+    0x1F150, 0x1F169,
+    0x1F170, 0x1F189,
+    0x1F200, 0x1F6FF
+};
+
+// UNICODE VERTICAL TEXT LAYOUT http://www.unicode.org/reports/tr50/

[drott, 2016/01/14 12:10:53]

I wouldn't uppercase the comment here. Perhaps:

// Individual codepoints < 0xFF from 
// needed for Unicode vertical text layout according to 
// http://www.unicode.org/reports/tr50/
// Taken from the corresponding data file:
// http://www.unicode.org/Public/vertical/revision-15/VerticalOrientation-15.txt

[kojii, 2016/01/14 15:34:33]

Done (actually data is still rev 13, I need to update to 15...)

+static const UChar32 isUprightInMixedVerticalArray[] = {
+    0x000A7,
+    0x000A9,
+    0x000AE,
+    0x000B1,
+    0x000D7,
+    0x000F7
+};
+
+static const UChar32 isUprightInMixedVerticalRanges[] = {
+    0x000BC, 0x000BE,
+    // Spacing Modifier Letters (Part of)
+    0x002EA, 0x002EB,
+    // Hangul Jamo
+    0x01100, 0x011FF,
+    // Unified Canadian Aboriginal Syllabics
+    0x01401, 0x0167F,
+    // Unified Canadian Aboriginal Syllabics Extended
+    0x018B0, 0x018FF,
+    // General Punctuation (Part of)
+    0x02016, 0x02016,
+    0x02020, 0x02021,
+    0x02030, 0x02031,
+    0x0203B, 0x0203C,
+    0x02042, 0x02042,
+    0x02047, 0x02049,
+    0x02051, 0x02051,
+    0x02065, 0x02069,
+    // Combining Diacritical Marks for Symbols (Part of)
+    0x020DD, 0x020E0,
+    0x020E2, 0x020E4,
+    // Letterlike Symbols (Part of)/Number Forms
+    0x02100, 0x02101,
+    0x02103, 0x02109,
+    0x0210F, 0x0210F,
+    0x02113, 0x02114,
+    0x02116, 0x02117,
+    0x0211E, 0x02123,
+    0x02125, 0x02125,
+    0x02127, 0x02127,
+    0x02129, 0x02129,
+    0x0212E, 0x0212E,
+    0x02135, 0x0213F,
+    0x02145, 0x0214A,
+    0x0214C, 0x0214D,
+    0x0214F, 0x0218F,
+    // Mathematical Operators (Part of)
+    0x0221E, 0x0221E,
+    0x02234, 0x02235,
+    // Miscellaneous Technical (Part of)
+    0x02300, 0x02307,
+    0x0230C, 0x0231F,
+    0x02324, 0x0232B,
+    0x0237D, 0x0239A,
+    0x023BE, 0x023CD,
+    0x023CF, 0x023CF,
+    0x023D1, 0x023DB,
+    0x023E2, 0x02422,
+    // Control Pictures (Part of)/Optical Character Recognition/Enclosed Alphanumerics
+    0x02424, 0x024FF,
+    // Geometric Shapes/Miscellaneous Symbols (Part of)
+    0x025A0, 0x02619,
+    0x02620, 0x02767,
+    0x02776, 0x02793,
+    // Miscellaneous Symbols and Arrows (Part of)
+    0x02B12, 0x02B2F,
+    0x02B50, 0x02B59,
+    0x02BB8, 0x02BFF,
+    // Common CJK
+    0x02E80, 0x0A4CF,
+    // Hangul Jamo Extended-A
+    0x0A960, 0x0A97F,
+    // Hangul Syllables/Hangul Jamo Extended-B
+    0x0AC00, 0x0D7FF,
+    // Private Use Area/CJK Compatibility Ideographs
+    0x0E000, 0x0FAFF,
+    // Vertical Forms
+    0x0FE10, 0x0FE1F,
+    // CJK Compatibility Forms (Part of)
+    0x0FE30, 0x0FE48,
+    // Small Form Variants (Part of)
+    0x0FE50, 0x0FE57,
+    0x0FE59, 0x0FE62,
+    0x0FE67, 0x0FE6F,
+    // Halfwidth and Fullwidth Forms
+    0x0FF01, 0x0FF0C,
+    0x0FF0E, 0x0FF1B,
+    0x0FF1F, 0x0FF60,
+    0x0FFE0, 0x0FFE7,
+    // Specials (Part of)
+    0x0FFF0, 0x0FFF8,
+    0x0FFFC, 0x0FFFD,
+    // Meroitic Hieroglyphs
+    0x10980, 0x1099F,
+    // Siddham
+    0x11580, 0x115FF,
+    // Egyptian Hieroglyphs
+    0x13000, 0x1342F,
+    // Kana Supplement
+    0x1B000, 0x1B0FF,
+    // Byzantine Musical Symbols/Musical Symbols
+    0x1D000, 0x1D1FF,
+    // Tai Xuan Jing Symbols/Counting Rod Numerals
+    0x1D300, 0x1D37F,
+    // Mahjong Tiles/Domino Tiles/Playing Cards/Enclosed Alphanumeric Supplement
+    // Enclosed Ideographic Supplement/Enclosed Ideographic Supplement
+    // Emoticons/Ornamental Dingbats/Transport and Map Symbols/Alchemical Symbols
+    // Alchemical Symbols
+    0x1F000, 0x1F7FF,
+    // CJK Unified Ideographs Extension B/C/D
+    // CJK Compatibility Ideographs Supplement
+    0x20000, 0x2FFFD,
+    0x30000, 0x3FFFD,
+    // Supplementary Private Use Area-A
+    0xF0000, 0xFFFFD,
+    // Supplementary Private Use Area-B
+    0x100000, 0x10FFFD,
+};
+
+using CharacterPropertiesType = uint8_t;
+
+enum class CharacterProperties : CharacterPropertiesType {
+    isCJKIdeographOrSymbol = 0x0001,
+    isUprightInMixedVertical = 0x0002,
+};
+
+inline CharacterProperties operator | (CharacterProperties a, CharacterProperties b)
+{
+    return static_cast<CharacterProperties>((static_cast<CharacterPropertiesType>(a) | static_cast<CharacterPropertiesType>(b)));
+}
+
+inline CharacterProperties operator & (CharacterProperties a, CharacterProperties b)
+{
+    return static_cast<CharacterProperties>((static_cast<CharacterPropertiesType>(a) & static_cast<CharacterPropertiesType>(b)));
+}
+
+inline CharacterProperties operator |= (CharacterProperties& a, CharacterProperties b)
+{
+    a = a | b;
+    return a;
+}
+
+const UChar32 maxCodePointForPropertyValues = 0x10FFFD;

[drott, 2016/01/14 12:10:53]

As far as I can see this is only used for the assertions and the dependency to
the 0x10FFFD value in isUprightInMixedVerticalRanges is not documented or clear
here. I would find it clearer to not redefine a value here and use kMaxCodepoint
from CharacterNames and use that for the ASSERTions.

[kojii, 2016/01/14 15:34:33]

Couldn't find that definition, thanks!

+
+static void setRanges(CharacterProperties* values, const UChar32* ranges, size_t length, CharacterProperties value)

[drott, 2016/01/14 12:10:53]

If I understand correctly, the CharacterProperties array is a rather heavy 8,5MB
temporary data structure to fuse the two characteristics isCJKIdeographOrSymbol
and isUprightInMixedVertical. I'm a little wary of this large ad-hoc allocation
that can be avoided.

It could be faster (because gaps could be skipped) and leaner in terms of memory
if we had two iterators that could find the next nearest boundary for
isCJKIdeographOrSymbol and isUprightInMixedVertical, keep track of the mode of
the property values (i.e. 0x01, 0x02 or 0x03) and call utrie2_setRange32
accordingly.

To simplify, isolated codepoints could be defined as trivial
one-codepoint-ranges, too.

If that's too much code to write, UnicodeSet probably does this work for us if
we define the ranges in the pattern format that UnicodeSet understands.

[kojii, 2016/01/14 15:34:33]

It's 1.1MB because CharacterProperties is uint8_t. Is it still too much? I made
this simple because:
* It's 1.1MB, and only alive within this function.
* Hoping to get this function out to build time, though it may take a bit
(learned gn, but gyp looks like harder. My colleague recommended to do it after
moving to gn. Maybe gn-only is good for now, as it helps Android.)
* As we measure, we may want more methods to move to this. For instance,
Character:: treatAsZeroWidthSpace()
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit...
could also move to this. Iterator approach can be more complex and slower if we
add more.

With UnicodeSet, we need one UnicodeSet for each property, so true we don't need
this, but we need more memory in run time. One UTrie2 can hold up to 16/32 bits
value, so it's more effective once it's built, but to build, we need the merged
value.

WDYT?

+{
+    ASSERT(length % 2 == 0);
+    const UChar32* end = ranges + length;
+    for (; ranges != end; ranges += 2) {
+        ASSERT(ranges[0] <= ranges[1] && ranges[1] <= maxCodePointForPropertyValues);
+        for (UChar32 c = ranges[0]; c <= ranges[1]; c++)
+            values[c] |= value;
+    }
+}
+
+static void setValues(CharacterProperties* values, const UChar32* begin, size_t length, CharacterProperties value)
+{
+    const UChar32* end = begin + length;
+    for (; begin != end; begin++) {
+        ASSERT(*begin <= maxCodePointForPropertyValues);
+        values[*begin] |= value;
+    }
+}
+
+static UTrie2* createTrie()
+{
+    // Create a value array of all possible code points.
+    const UChar32 size = maxCodePointForPropertyValues + 1;
+    OwnPtr<CharacterProperties[]> values = adoptArrayPtr(new CharacterProperties[size]);
+    memset(values.get(), 0, sizeof(CharacterProperties) * size);
+    setRanges(values.get(), cjkIdeographRanges, WTF_ARRAY_LENGTH(cjkIdeographRanges),
+        CharacterProperties::isCJKIdeographOrSymbol);
+    setRanges(values.get(), cjkSymbolRanges, WTF_ARRAY_LENGTH(cjkSymbolRanges),
+        CharacterProperties::isCJKIdeographOrSymbol);
+    setValues(values.get(), cjkIsolatedSymbolsArray, WTF_ARRAY_LENGTH(cjkIsolatedSymbolsArray),
+        CharacterProperties::isCJKIdeographOrSymbol);
+    setRanges(values.get(), isUprightInMixedVerticalRanges, WTF_ARRAY_LENGTH(isUprightInMixedVerticalRanges),
+        CharacterProperties::isUprightInMixedVertical);
+    setValues(values.get(), isUprightInMixedVerticalArray, WTF_ARRAY_LENGTH(isUprightInMixedVerticalArray),
+        CharacterProperties::isUprightInMixedVertical);
+
+    // Create a Trie from the value array.
+    UErrorCode error = U_ZERO_ERROR;
+    UTrie2* trie = utrie2_open(0, 0, &error);
+    UChar32 start = 0;
+    CharacterProperties value = values[0];
+    for (UChar32 c = 1; ; c++) {
+        if (c < size && values[c] == value)
+            continue;
+        if (static_cast<uint32_t>(value))
+            utrie2_setRange32(trie, start, c - 1, static_cast<uint32_t>(value), TRUE, &error);
+        if (c >= size)
+            break;
+        start = c;
+        value = values[c];
+    }
+    utrie2_freeze(trie, UTrie2ValueBits::UTRIE2_16_VALUE_BITS, &error);
+    return trie;
+}
+
+static bool hasCharacterProperty(UChar32 c, CharacterProperties property)
+{
+    static UTrie2* trie = nullptr;
+    if (!trie)
+        trie = createTrie();
+    return UTRIE2_GET16(trie, c) & static_cast<CharacterPropertiesType>(property);
+}
+
 // Takes a flattened list of closed intervals
 template <class T, size_t size>
 bool valueInIntervalList(const T (&intervalList)[size], const T& value)
@@ -177,163 +447,7 @@ CodePath Character::characterRangeCodePath(const UChar* characters, unsigned len
 
 bool Character::isUprightInMixedVertical(UChar32 character)
 {
-    // Fast path for common non-CJK
-    if (character < 0x000A7)
-        return false;
-
-    // Fast path for common CJK
-    if (isInRange(character, 0x02E80, 0x0A4CF))
-        return true;
-
-    if (isInRange(character, 0x0FF01, 0x0FFE7)) {
-        if (character <= 0x0FF0C || isInRange(character, 0x0FF0E, 0x0FF1B)
-            || isInRange(character, 0x0FF1F, 0x0FF60) || character >= 0x0FFE0)
-            return true;
-        return false;
-    }
-
-    // Fast path for medium-common non-CJK
-    if (character == 0x000A7 || character == 0x000A9 || character == 0x000AE)
-        return true;
-    if (character == 0x000B1 || character == 0x000BC || character == 0x000BD || character == 0x000BE)
-        return true;
-    if (character == 0x000D7 || character == 0x000F7)
-        return true;
-    if (character < 0x002EA)
-        return false;
-
-    static const UChar32 uprightRanges[] = {
-        // Spacing Modifier Letters (Part of)
-        0x002EA, 0x002EB,
-        // Hangul Jamo
-        0x01100, 0x011FF,
-        // Unified Canadian Aboriginal Syllabics
-        0x01401, 0x0167F,
-        // Unified Canadian Aboriginal Syllabics Extended
-        0x018B0, 0x018FF,
-        // General Punctuation (Part of)
-        0x02016, 0x02016,
-        0x02020, 0x02021,
-        0x02030, 0x02031,
-        0x0203B, 0x0203C,
-        0x02042, 0x02042,
-        0x02047, 0x02049,
-        0x02051, 0x02051,
-        0x02065, 0x02069,
-        // Combining Diacritical Marks for Symbols (Part of)
-        0x020DD, 0x020E0,
-        0x020E2, 0x020E4,
-        // Letterlike Symbols (Part of)/Number Forms
-        0x02100, 0x02101,
-        0x02103, 0x02109,
-        0x0210F, 0x0210F,
-        0x02113, 0x02114,
-        0x02116, 0x02117,
-        0x0211E, 0x02123,
-        0x02125, 0x02125,
-        0x02127, 0x02127,
-        0x02129, 0x02129,
-        0x0212E, 0x0212E,
-        0x02135, 0x0213F,
-        0x02145, 0x0214A,
-        0x0214C, 0x0214D,
-        0x0214F, 0x0218F,
-        // Mathematical Operators (Part of)
-        0x0221E, 0x0221E,
-        0x02234, 0x02235,
-        // Miscellaneous Technical (Part of)
-        0x02300, 0x02307,
-        0x0230C, 0x0231F,
-        0x02324, 0x0232B,
-        0x0237D, 0x0239A,
-        0x023BE, 0x023CD,
-        0x023CF, 0x023CF,
-        0x023D1, 0x023DB,
-        0x023E2, 0x02422,
-        // Control Pictures (Part of)/Optical Character Recognition/Enclosed Alphanumerics
-        0x02424, 0x024FF,
-        // Geometric Shapes/Miscellaneous Symbols (Part of)
-        0x025A0, 0x02619,
-        0x02620, 0x02767,
-        0x02776, 0x02793,
-        // Miscellaneous Symbols and Arrows (Part of)
-        0x02B12, 0x02B2F,
-        0x02B50, 0x02B59,
-        0x02BB8, 0x02BFF,
-        // Hangul Jamo Extended-A
-        0x0A960, 0x0A97F,
-        // Hangul Syllables/Hangul Jamo Extended-B
-        0x0AC00, 0x0D7FF,
-        // Private Use Area/CJK Compatibility Ideographs
-        0x0E000, 0x0FAFF,
-        // Vertical Forms
-        0x0FE10, 0x0FE1F,
-        // CJK Compatibility Forms (Part of)
-        0x0FE30, 0x0FE48,
-        // Small Form Variants (Part of)
-        0x0FE50, 0x0FE57,
-        0x0FE59, 0x0FE62,
-        0x0FE67, 0x0FE6F,
-        // Specials (Part of)
-        0x0FFF0, 0x0FFF8,
-        0x0FFFC, 0x0FFFD,
-        // Meroitic Hieroglyphs
-        0x10980, 0x1099F,
-        // Siddham
-        0x11580, 0x115FF,
-        // Egyptian Hieroglyphs
-        0x13000, 0x1342F,
-        // Kana Supplement
-        0x1B000, 0x1B0FF,
-        // Byzantine Musical Symbols/Musical Symbols
-        0x1D000, 0x1D1FF,
-        // Tai Xuan Jing Symbols/Counting Rod Numerals
-        0x1D300, 0x1D37F,
-        // Mahjong Tiles/Domino Tiles/Playing Cards/Enclosed Alphanumeric Supplement
-        // Enclosed Ideographic Supplement/Enclosed Ideographic Supplement
-        // Emoticons/Ornamental Dingbats/Transport and Map Symbols/Alchemical Symbols
-        // Alchemical Symbols
-        0x1F000, 0x1F7FF,
-        // CJK Unified Ideographs Extension B/C/D
-        // CJK Compatibility Ideographs Supplement
-        0x20000, 0x2FFFD,
-        0x30000, 0x3FFFD,
-        // Supplementary Private Use Area-A
-        0xF0000, 0xFFFFD,
-        // Supplementary Private Use Area-B
-        0x100000, 0x10FFFD,
-    };
-    return valueInIntervalList(uprightRanges, character);
-}
-
-bool Character::isCJKIdeograph(UChar32 c)
-{
-    static const UChar32 cjkIdeographRanges[] = {
-        // CJK Radicals Supplement and Kangxi Radicals.
-        0x2E80, 0x2FDF,
-        // CJK Strokes.
-        0x31C0, 0x31EF,
-        // CJK Unified Ideographs Extension A.
-        0x3400, 0x4DBF,
-        // The basic CJK Unified Ideographs block.
-        0x4E00, 0x9FFF,
-        // CJK Compatibility Ideographs.
-        0xF900, 0xFAFF,
-        // CJK Unified Ideographs Extension B.
-        0x20000, 0x2A6DF,
-        // CJK Unified Ideographs Extension C.
-        // CJK Unified Ideographs Extension D.
-        0x2A700, 0x2B81F,
-        // CJK Compatibility Ideographs Supplement.
-        0x2F800, 0x2FA1F
-    };
-    static size_t cjkIdeographRangesCount = WTF_ARRAY_LENGTH(cjkIdeographRanges);
-
-    // Early out
-    if (c < cjkIdeographRanges[0] || c > cjkIdeographRanges[cjkIdeographRangesCount - 1])
-        return false;
-
-    return valueInIntervalList(cjkIdeographRanges, c);
+    return hasCharacterProperty(character, CharacterProperties::isUprightInMixedVertical);
 }
 
 bool Character::isCJKIdeographOrSymbol(UChar32 c)
@@ -342,64 +456,7 @@ bool Character::isCJKIdeographOrSymbol(UChar32 c)
     if (c < 0x2C7)
         return false;
 
-    if (isCJKIdeograph(c))
-        return true;
-
-    static const UChar32 cjkSymbolRanges[] = {
-        0x2156, 0x215A,
-        0x2160, 0x216B,
-        0x2170, 0x217B,
-        0x23BE, 0x23CC,
-        0x2460, 0x2492,
-        0x249C, 0x24FF,
-        0x25CE, 0x25D3,
-        0x25E2, 0x25E6,
-        0x2600, 0x2603,
-        0x2660, 0x266F,
-        0x2672, 0x267D,
-        0x2776, 0x277F,
-        // Ideographic Description Characters, with CJK Symbols and Punctuation, excluding 0x3030.
-        // Then Hiragana 0x3040 .. 0x309F, Katakana 0x30A0 .. 0x30FF, Bopomofo 0x3100 .. 0x312F
-        0x2FF0, 0x302F,
-        0x3031, 0x312F,
-        // More Bopomofo and Bopomofo Extended 0x31A0 .. 0x31BF
-        0x3190, 0x31BF,
-        // Enclosed CJK Letters and Months (0x3200 .. 0x32FF).
-        // CJK Compatibility (0x3300 .. 0x33FF).
-        0x3200, 0x33FF,
-        0xF860, 0xF862,
-        // CJK Compatibility Forms.
-        0xFE30, 0xFE4F,
-        // Halfwidth and Fullwidth Forms
-        // Usually only used in CJK
-        0xFF00, 0xFF0C,
-        0xFF0E, 0xFF1A,
-        0xFF1F, 0xFFEF,
-        // Emoji.
-        0x1F110, 0x1F129,
-        0x1F130, 0x1F149,
-        0x1F150, 0x1F169,
-        0x1F170, 0x1F189,
-        0x1F200, 0x1F6FF
-    };
-
-    if (c >= cjkSymbolRanges[0]
-        && c <= cjkSymbolRanges[WTF_ARRAY_LENGTH(cjkSymbolRanges) - 1]
-        && valueInIntervalList(cjkSymbolRanges, c)) {
-        return true;
-    }
-
-    if (c < 0x2020 && c > 0x2D9)
-        return false;
-
-    // Hash lookup for isolated symbols (those not part of a contiguous range)
-    static HashSet<UChar32>* cjkIsolatedSymbols = 0;
-    if (!cjkIsolatedSymbols) {
-        cjkIsolatedSymbols = new HashSet<UChar32>();
-        for (size_t i = 0; i < WTF_ARRAY_LENGTH(cjkIsolatedSymbolsArray); ++i)
-            cjkIsolatedSymbols->add(cjkIsolatedSymbolsArray[i]);
-    }
-    return cjkIsolatedSymbols->contains(c);
+    return hasCharacterProperty(c, CharacterProperties::isCJKIdeographOrSymbol);
 }
 
 unsigned Character::expansionOpportunityCount(const LChar* characters, size_t length, TextDirection direction, bool& isAfterExpansion, const TextJustify textJustify)