| using Lucene.Net.Diagnostics; |
| using System; |
| using System.Diagnostics; |
| |
| namespace Lucene.Net.Analysis.Util |
| { |
| /* |
| * 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. |
| */ |
| |
| /// <summary> |
| /// Some commonly-used stemming functions |
| /// |
| /// @lucene.internal |
| /// </summary> |
| public static class StemmerUtil // LUCENENET specific: CA1052 Static holder types should be Static or NotInheritable |
| { |
| /// <summary> |
| /// Returns true if the character array starts with the prefix. |
| /// </summary> |
| /// <param name="s"> Input Buffer </param> |
| /// <param name="len"> length of input buffer </param> |
| /// <param name="prefix"> Prefix string to test </param> |
| /// <returns> <c>true</c> if <paramref name="s"/> starts with <paramref name="prefix"/> </returns> |
| public static bool StartsWith(char[] s, int len, string prefix) |
| { |
| int prefixLen = prefix.Length; |
| if (prefixLen > len) |
| { |
| return false; |
| } |
| for (int i = 0; i < prefixLen; i++) |
| { |
| if (s[i] != prefix[i]) |
| { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /// <summary> |
| /// Returns true if the character array ends with the suffix. |
| /// </summary> |
| /// <param name="s"> Input Buffer </param> |
| /// <param name="len"> length of input buffer </param> |
| /// <param name="suffix"> Suffix string to test </param> |
| /// <returns> <c>true</c> if <paramref name="s"/> ends with <paramref name="suffix"/> </returns> |
| public static bool EndsWith(char[] s, int len, string suffix) |
| { |
| int suffixLen = suffix.Length; |
| if (suffixLen > len) |
| { |
| return false; |
| } |
| for (int i = suffixLen - 1; i >= 0; i--) |
| { |
| if (s[len - (suffixLen - i)] != suffix[i]) |
| { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| /// <summary> |
| /// Returns true if the character array ends with the suffix. |
| /// </summary> |
| /// <param name="s"> Input Buffer </param> |
| /// <param name="len"> length of input buffer </param> |
| /// <param name="suffix"> Suffix string to test </param> |
| /// <returns> <c>true</c> if <paramref name="s"/> ends with <paramref name="suffix"/> </returns> |
| public static bool EndsWith(char[] s, int len, char[] suffix) |
| { |
| int suffixLen = suffix.Length; |
| if (suffixLen > len) |
| { |
| return false; |
| } |
| for (int i = suffixLen - 1; i >= 0; i--) |
| { |
| if (s[len - (suffixLen - i)] != suffix[i]) |
| { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| /// <summary> |
| /// Delete a character in-place |
| /// </summary> |
| /// <param name="s"> Input Buffer </param> |
| /// <param name="pos"> Position of character to delete </param> |
| /// <param name="len"> length of input buffer </param> |
| /// <returns> length of input buffer after deletion </returns> |
| public static int Delete(char[] s, int pos, int len) |
| { |
| if (Debugging.AssertsEnabled) Debugging.Assert(pos < len); |
| if (pos < len - 1) // don't arraycopy if asked to delete last character |
| { |
| Array.Copy(s, pos + 1, s, pos, len - pos - 1); |
| } |
| return len - 1; |
| } |
| |
| /// <summary> |
| /// Delete n characters in-place |
| /// </summary> |
| /// <param name="s"> Input Buffer </param> |
| /// <param name="pos"> Position of character to delete </param> |
| /// <param name="len"> Length of input buffer </param> |
| /// <param name="nChars"> number of characters to delete </param> |
| /// <returns> length of input buffer after deletion </returns> |
| public static int DeleteN(char[] s, int pos, int len, int nChars) |
| { |
| if (Debugging.AssertsEnabled) Debugging.Assert(pos + nChars <= len); |
| if (pos + nChars < len) // don't arraycopy if asked to delete the last characters |
| { |
| Array.Copy(s, pos + nChars, s, pos, len - pos - nChars); |
| } |
| return len - nChars; |
| } |
| } |
| } |