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+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Parses Lao text, with syllable as token.
+#
+# The definition of Lao syllable is based from:
+#
+#   Syllabification of Lao Script for Line Breaking
+#   Phonpasit Phissamay, Valaxay Dalolay, Chitaphone Chanhsililath, Oulaiphone Silimasak, 
+#     Sarmad Hussain, Nadir Durrani, Science Technology and Environment Agency, CRULP
+#   http://www.panl10n.net/english/final%20reports/pdf%20files/Laos/LAO06.pdf
+#	http://www.panl10n.net/Presentations/Cambodia/Phonpassit/LineBreakingAlgo.pdf
+#
+# NOTE:
+# There are some ambiguities in Lao syllabification without additional processing, as mentioned in the paper.
+# For this reason, this RBBI grammar really only works with LaoBreakIterator, as it does this additional work.
+#
+# Syllable structure, where X is the nuclear consonant:
+#
+#           +----+
+#           | X5 |
+#           +----+
+#           | X4 |
+# +----+----+----+----+----+----+----+-----+
+# | X0 | X1 | X  | X6 | X7 | X8 | X9 | X10 |
+# +----+----+----+----+----+----+----+-----+
+#           | X2 |
+#           +----+
+#           | X3 |
+#           +----+
+#
+# X0 represents a vowel which occurs before the nuclear consonant. 
+# It can always define the beginning of syllable.
+$X0 = [\u0EC0-\u0EC4];
+# X1 is a combination consonant which comes before the nuclear consonant, 
+# but only if nuclear consonant is one of {ງ ຍ ລ ວ ຼ ມ ນ ຣ}
+$X1 = [\u0EAB];
+# X represents the nuclear consonant.
+$X = [\u0E81-\u0EAE\u0EDC\u0EDD];
+# X2 is a combination consonant which comes after the nuclear consonant, 
+# which is placed under or next to the nuclear consonant.
+$X2 = [\u0EBC\u0EA3\u0EA7\u0EA5];
+# X3 represents a vowel which occurs under the nuclear consonant.
+$X3 = [\u0EB8\u0EB9];
+# X4 represents a vowel which occurs above the nuclear consonant. 
+$X4 = [\u0EB4-\u0EB7\u0ECD\u0EBB\u0EB1];
+# X5 represents a tone mark which occurs above the nuclear consonant or upper vowel.
+$X5 = [\u0EC8-\u0ECB];
+# X6 represents a consonant vowel, which occurs after the nuclear consonant. 
+# It functions when the syllable doesn’t have any vowels. And it always exists with X8.
+$X6 = [\u0EA7\u0EAD\u0EBD];
+# X7 represents a final vowel. 
+# However X7_1 always represents the end of syllable and it never exists with tone mark.
+$X7 = [\u0EB0\u0EB2\u0EB3];
+# X8 represents an alternate consonant.
+$X8 = [\u0E81\u0E87\u0E8D\u0E94\u0E99\u0EA1\u0E9A\u0EA7];
+# X9 represents alternate consonants to pronounce foreign terms, it always exist with X10_3.
+$X9 = [\u0E88\u0EAA\u0E8A\u0E9E\u0E9F\u0EA5];
+# X10 represents a sign mark. 
+# It always occurs at the end of a syllable, but mostly people keep it separate from syllable.
+$X10 = [\u0EAF\u0EC6\u0ECC];
+
+# Section 1
+$X0_1 = [\u0EC0];
+$X4_1_2 = [\u0EB4\u0EB5];
+$X4_3_4 = [\u0EB6\u0EB7];
+$X4_6 = [\u0EBB];
+$X4_7 = [\u0EB1];
+$X6_2 = [\u0EAD];
+$X6_3 = [\u0EBD];
+$X7_1 = [\u0EB0];
+$X7_2 = [\u0EB2];
+$X10_1 = [\u0EAF];
+$X10_2 = [\u0EC6];
+$X10_3 = [\u0ECC];
+
+$Rule1_1 = $X0_1 ($X1)? $X ($X2)? ($X5)? ($X8)? ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+$Rule1_2 = $X0_1 ($X1)? $X ($X2)? $X4_1_2 ($X5)? ($X8)? ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+$Rule1_3 = $X0_1 ($X1)? $X ($X2)? $X4_3_4 ($X5)? $X6_2 ($X8)? ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+$Rule1_4 = $X0_1 ($X1)? $X ($X2)? ($X7_2)? $X7_1;
+$Rule1_5 = $X0_1 ($X1)? $X ($X2)? $X4_6 ($X5)? $X7_2 ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+$Rule1_6 = $X0_1 ($X1)? $X ($X2)? $X4_7 ($X5)? $X8 ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+$Rule1_7 = $X0_1 ($X1)? $X ($X2)? ($X4_7)? ($X5)? $X6_3 ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+
+$Rule1 = ($Rule1_1 | $Rule1_2 | $Rule1_3 | $Rule1_4 | $Rule1_5 | $Rule1_6 | $Rule1_7);
+
+# Section 2
+$X0_2 = [\u0EC1];
+
+$Rule2_1 = $X0_2 ($X1)? $X ($X2)? ($X5)? ($X6)? ($X8)? ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+$Rule2_2 = $X0_2 ($X1)? $X ($X2)? $X7_1;
+$Rule2_3 = $X0_2 ($X1)? $X ($X2)? $X4_7 ($X5)? $X8 ($X9 $X10_3)? ($X10_2)? ($X10_1)?; 
+
+$Rule2 = ($Rule2_1 | $Rule2_2 | $Rule2_3);
+
+# Section 3
+$X0_3 = [\u0EC2];
+$X8_3 = [\u0E8D];
+$X8_8 = [\u0EA7];
+
+$Rule3_1 = $X0_3 ($X1)? $X ($X2)? ($X5)? ($X8)? ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+$Rule3_2 = $X0_3 ($X1)? $X ($X2)? $X7_1;
+$Rule3_3 = $X0_3 ($X1)? $X ($X2)? $X4_7 ($X5)? ($X8_3 | $X8_8);
+
+$Rule3 = ($Rule3_1 | $Rule3_2 | $Rule3_3);
+
+# Section 4
+$X0_4 = [\u0EC4];
+$X6_1 = [\u0EA7];
+
+$Rule4 = $X0_4 ($X1)? $X ($X2)? ($X5)? ($X6_1)? ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+
+# Section 5
+$X0_5 = [\u0EC3];
+
+$Rule5 = $X0_5 ($X1)? $X ($X2)? ($X5)? ($X6_1)? ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+
+# Section 6
+$Rule6 = ($X1)? $X ($X2)? $X3 ($X5)? ($X8)? ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+
+# Section 7
+$X4_1_4 = [\u0EB4-\u0EB7];
+
+$Rule7 = ($X1)? $X ($X2)? $X4_1_4 ($X5)? ($X8)? ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+
+# Section 8
+$X4_5 = [\u0ECD];
+
+$Rule8 = ($X1)? $X ($X2)? $X4_5 ($X5)? ($X7_2)? ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+
+# Section 9
+
+$Rule9_1 = ($X1)? $X ($X2)? $X4_6 ($X5)? $X8 ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+$Rule9_2 = ($X1)? $X ($X2)? $X4_6 ($X5)? $X6_1 $X7_1;
+
+$Rule9 = ($Rule9_1 | $Rule9_2);
+
+# Section 10
+$Rule10 = ($X1)? $X ($X2)? $X4_7 ($X5)? ($X6_1)? $X8 ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+
+# Section 11
+$Rule11 = ($X1)? $X ($X2)? ($X5)? $X6 $X8 ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+
+# Section 12
+$Rule12 = ($X1)? $X ($X2)? ($X5)? $X7_1;
+
+# Section 13
+$Rule13 = ($X1)? $X ($X2)? ($X5)? $X7_2 ($X8)? ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+
+# Section 14
+$X7_3 = [\u0EB3];
+
+$Rule14 = ($X1)? $X ($X2)? ($X5)? $X7_3 ($X9 $X10_3)? ($X10_2)? ($X10_1)?;
+
+$LaoSyllableEx = ($Rule1 | $Rule2 | $Rule3 | $Rule4 | $Rule5 | $Rule6 | $Rule7 | $Rule8 | $Rule9 | $Rule10 | $Rule11 | $Rule12 | $Rule13 | $Rule14);
+
+$WordJoin = [:Line_Break=Word_Joiner:];
+
+$LaoJoinedSyllableEx = $LaoSyllableEx ($WordJoin $LaoSyllableEx)*;
+
+#
+# default numerical definitions
+#
+$Extend       = [\p{Word_Break = Extend}];
+$Format       = [\p{Word_Break = Format}];
+$MidNumLet    = [\p{Word_Break = MidNumLet}];
+$MidNum       = [\p{Word_Break = MidNum}];
+$Numeric      = [\p{Word_Break = Numeric}];
+$ExtendNumLet = [\p{Word_Break = ExtendNumLet}];                                                          
+$MidNumLetEx    = $MidNumLet    ($Extend |  $Format)*;
+$MidNumEx       = $MidNum       ($Extend |  $Format)*;
+$NumericEx      = $Numeric      ($Extend |  $Format)*;
+$ExtendNumLetEx = $ExtendNumLet ($Extend |  $Format)*;
+
+!!forward;
+
+$LaoJoinedSyllableEx {200};
+# default numeric rules
+$NumericEx $ExtendNumLetEx? (($MidNumEx | $MidNumLetEx)? $NumericEx $ExtendNumLetEx?)*  {100};