author | erikj |
Tue, 12 Sep 2017 19:03:39 +0200 | |
changeset 47216 | 71c04702a3d5 |
parent 35783 | jdk/src/java.base/share/classes/java/util/regex/Grapheme.java@2690535d72cc |
child 55013 | 8dae495a59e7 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.util.regex; |
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final class Grapheme { |
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/** |
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* Determines if there is an extended grapheme cluster boundary between two |
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* continuing characters {@code cp1} and {@code cp2}. |
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* <p> |
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* See Unicode Standard Annex #29 Unicode Text Segmentation for the specification |
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* for the extended grapheme cluster boundary rules |
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*/ |
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static boolean isBoundary(int cp1, int cp2) { |
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return rules[getType(cp1)][getType(cp2)]; |
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} |
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// types |
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private static final int OTHER = 0; |
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private static final int CR = 1; |
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private static final int LF = 2; |
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private static final int CONTROL = 3; |
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private static final int EXTEND = 4; |
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private static final int RI = 5; |
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private static final int PREPEND = 6; |
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private static final int SPACINGMARK = 7; |
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private static final int L = 8; |
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private static final int V = 9; |
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private static final int T = 10; |
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private static final int LV = 11; |
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private static final int LVT = 12; |
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|
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private static final int FIRST_TYPE = 0; |
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private static final int LAST_TYPE = 12; |
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private static boolean[][] rules; |
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static { |
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rules = new boolean[LAST_TYPE + 1][LAST_TYPE + 1]; |
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// default, any + any |
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for (int i = FIRST_TYPE; i <= LAST_TYPE; i++) |
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for (int j = FIRST_TYPE; j <= LAST_TYPE; j++) |
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rules[i][j] = true; |
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// GB 6 L x (L | V | LV | VT) |
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rules[L][L] = false; |
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rules[L][V] = false; |
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rules[L][LV] = false; |
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rules[L][LVT] = false; |
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// GB 7 (LV | V) x (V | T) |
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rules[LV][V] = false; |
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rules[LV][T] = false; |
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rules[V][V] = false; |
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rules[V][T] = false; |
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// GB 8 (LVT | T) x T |
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rules[LVT][T] = false; |
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rules[T][T] = false; |
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// GB 8a RI x RI |
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rules[RI][RI] = false; |
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// GB 9 x Extend |
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// GB 9a x Spacing Mark |
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// GB 9b Prepend x |
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for (int i = FIRST_TYPE; i <= LAST_TYPE; i++) { |
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rules[i][EXTEND] = false; |
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rules[i][SPACINGMARK] = false; |
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rules[PREPEND][i] = false; |
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} |
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// GB 4 (Control | CR | LF) + |
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// GB 5 + (Control | CR | LF) |
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for (int i = FIRST_TYPE; i <= LAST_TYPE; i++) |
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for (int j = CR; j <= CONTROL; j++) { |
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rules[i][j] = true; |
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rules[j][i] = true; |
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} |
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// GB 3 CR x LF |
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rules[CR][LF] = false; |
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// GB 10 Any + Any -> default |
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} |
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// Hangul syllables |
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private static final int SYLLABLE_BASE = 0xAC00; |
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private static final int LCOUNT = 19; |
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private static final int VCOUNT = 21; |
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private static final int TCOUNT = 28; |
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private static final int NCOUNT = VCOUNT * TCOUNT; // 588 |
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private static final int SCOUNT = LCOUNT * NCOUNT; // 11172 |
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// #tr29: SpacingMark exceptions: The following (which have |
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// General_Category = Spacing_Mark and would otherwise be included) |
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// are specifically excluded |
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private static boolean isExcludedSpacingMark(int cp) { |
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return cp == 0x102B || cp == 0x102C || cp == 0x1038 || |
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cp >= 0x1062 && cp <= 0x1064 || |
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cp >= 0x1062 && cp <= 0x106D || |
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cp == 0x1083 || |
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cp >= 0x1087 && cp <= 0x108C || |
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cp == 0x108F || |
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cp >= 0x109A && cp <= 0x109C || |
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cp == 0x1A61 || cp == 0x1A63 || cp == 0x1A64 || |
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cp == 0xAA7B || cp == 0xAA7D; |
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} |
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@SuppressWarnings("fallthrough") |
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private static int getType(int cp) { |
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int type = Character.getType(cp); |
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switch(type) { |
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case Character.CONTROL: |
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if (cp == 0x000D) |
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return CR; |
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if (cp == 0x000A) |
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132 |
return LF; |
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133 |
return CONTROL; |
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134 |
case Character.UNASSIGNED: |
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135 |
// NOTE: #tr29 lists "Unassigned and Default_Ignorable_Code_Point" as Control |
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136 |
// but GraphemeBreakTest.txt lists u+0378/reserved-0378 as "Other" |
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137 |
// so type it as "Other" to make the test happy |
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138 |
if (cp == 0x0378) |
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139 |
return OTHER; |
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140 |
|
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141 |
case Character.LINE_SEPARATOR: |
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142 |
case Character.PARAGRAPH_SEPARATOR: |
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143 |
case Character.SURROGATE: |
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144 |
return CONTROL; |
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145 |
case Character.FORMAT: |
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146 |
if (cp == 0x200C || cp == 0x200D) |
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147 |
return EXTEND; |
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148 |
return CONTROL; |
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149 |
case Character.NON_SPACING_MARK: |
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150 |
case Character.ENCLOSING_MARK: |
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151 |
// NOTE: |
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152 |
// #tr29 "plus a few General_Category = Spacing_Mark needed for |
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153 |
// canonical equivalence." |
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154 |
// but for "extended grapheme clusters" support, there is no |
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155 |
// need actually to diff "extend" and "spackmark" given GB9, GB9a |
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156 |
return EXTEND; |
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157 |
case Character.COMBINING_SPACING_MARK: |
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158 |
if (isExcludedSpacingMark(cp)) |
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|
159 |
return OTHER; |
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160 |
// NOTE: |
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161 |
// 0x11720 and 0x11721 are mentioned in #tr29 as |
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162 |
// OTHER_LETTER but it appears their category has been updated to |
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163 |
// COMBING_SPACING_MARK already (verified in ver.8) |
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164 |
return SPACINGMARK; |
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165 |
case Character.OTHER_SYMBOL: |
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166 |
if (cp >= 0x1F1E6 && cp <= 0x1F1FF) |
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|
167 |
return RI; |
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|
168 |
return OTHER; |
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169 |
case Character.MODIFIER_LETTER: |
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170 |
// WARNING: |
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171 |
// not mentioned in #tr29 but listed in GraphemeBreakProperty.txt |
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172 |
if (cp == 0xFF9E || cp == 0xFF9F) |
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|
173 |
return EXTEND; |
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|
174 |
return OTHER; |
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|
175 |
case Character.OTHER_LETTER: |
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|
176 |
if (cp == 0x0E33 || cp == 0x0EB3) |
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|
177 |
return SPACINGMARK; |
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|
178 |
// hangul jamo |
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|
179 |
if (cp >= 0x1100 && cp <= 0x11FF) { |
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|
180 |
if (cp <= 0x115F) |
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|
181 |
return L; |
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|
182 |
if (cp <= 0x11A7) |
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|
183 |
return V; |
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|
184 |
return T; |
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|
185 |
} |
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|
186 |
// hangul syllables |
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|
187 |
int sindex = cp - SYLLABLE_BASE; |
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|
188 |
if (sindex >= 0 && sindex < SCOUNT) { |
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|
189 |
|
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|
190 |
if (sindex % TCOUNT == 0) |
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|
191 |
return LV; |
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|
192 |
return LVT; |
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|
193 |
} |
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|
194 |
// hangul jamo_extended A |
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|
195 |
if (cp >= 0xA960 && cp <= 0xA97C) |
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|
196 |
return L; |
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|
197 |
// hangul jamo_extended B |
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|
198 |
if (cp >= 0xD7B0 && cp <= 0xD7C6) |
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parents:
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changeset
|
199 |
return V; |
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parents:
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changeset
|
200 |
if (cp >= 0xD7CB && cp <= 0xD7FB) |
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parents:
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changeset
|
201 |
return T; |
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parents:
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|
202 |
} |
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parents:
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changeset
|
203 |
return OTHER; |
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|
204 |
} |
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|
205 |
} |