Add Constant object class

Author: pemistahl

src/main/kotlin/com/github/pemistahl/lingua/api/LanguageDetector.kt

@@ -59,6 +59,9 @@ import com.github.pemistahl.lingua.api.Language.UNKNOWN
 import com.github.pemistahl.lingua.api.Language.VIETNAMESE
 import com.github.pemistahl.lingua.api.Language.YORUBA
 import com.github.pemistahl.lingua.internal.Alphabet
+import com.github.pemistahl.lingua.internal.Constant.MULTIPLE_WHITESPACE
+import com.github.pemistahl.lingua.internal.Constant.NUMBERS
+import com.github.pemistahl.lingua.internal.Constant.PUNCTUATION
 import com.github.pemistahl.lingua.internal.Ngram
 import com.github.pemistahl.lingua.internal.TestDataLanguageModel
 import com.github.pemistahl.lingua.internal.TrainingDataLanguageModel
@@ -416,9 +419,6 @@ class LanguageDetector internal constructor(
 
     internal companion object {
         private val NO_LETTER = Regex("^[^\\p{L}]+$")
-        private val PUNCTUATION = Regex("\\p{P}")
-        private val NUMBERS = Regex("\\p{N}")
-        private val MULTIPLE_WHITESPACE = Regex("\\s+")
         private val JAPANESE_CHARACTER_SET = try {
             Regex("^[\\p{Hiragana}\\p{Katakana}\\p{Han}]+$")
         } catch (e: PatternSyntaxException) {

src/main/kotlin/com/github/pemistahl/lingua/api/io/TestDataFilesWriter.kt

@@ -17,17 +17,16 @@
 package com.github.pemistahl.lingua.api.io
 
 import com.github.pemistahl.lingua.api.Language
+import com.github.pemistahl.lingua.internal.Constant.MULTIPLE_WHITESPACE
+import com.github.pemistahl.lingua.internal.Constant.NUMBERS
+import com.github.pemistahl.lingua.internal.Constant.PUNCTUATION
 import com.github.pemistahl.lingua.internal.io.FilesWriter
 import java.nio.charset.Charset
 import java.nio.file.Files
 import java.nio.file.Path
 
 object TestDataFilesWriter : FilesWriter() {
 
-    private val PUNCTUATION = Regex("\\p{P}")
-    private val NUMBERS = Regex("\\p{N}")
-    private val MULTIPLE_WHITESPACE = Regex("\\s+")
-
     /**
      * Creates test data files for accuracy report generation and writes them to a directory.
      *

src/main/kotlin/com/github/pemistahl/lingua/internal/Constant.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright © 2018-2020 Peter M. Stahl pemistahl@gmail.com
+ *
+ * Licensed 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 expressed or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.github.pemistahl.lingua.internal
+
+internal object Constant {
+
+    val PUNCTUATION = Regex("\\p{P}")
+    val NUMBERS = Regex("\\p{N}")
+    val MULTIPLE_WHITESPACE = Regex("\\s+")
+}