blob: e5553ba6319eacb932820afbc5fede8e4f93c770 [file] [log] [blame]
// Lucene version compatibility level 4.8.1
using Lucene.Net.Diagnostics;
using Lucene.Net.Support;
using System;
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="prefix"> Prefix string to test </param>
/// <returns> <c>true</c> if <paramref name="s"/> starts with <paramref name="prefix"/> </returns>
/// <remarks>
/// LUCENENET NOTE: This method has been converted to use <see cref="ReadOnlySpan{T}"/>.
/// </remarks>
public static bool StartsWith(ReadOnlySpan<char> s, string prefix)
{
return StartsWith(s, prefix.AsSpan());
}
/// <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>
/// <remarks>
/// LUCENENET NOTE: This method has been converted to use <see cref="ReadOnlySpan{T}"/>.
/// Callers should prefer the overload without the <paramref name="len"/> parameter and use a slice instead,
/// but this overload is provided for compatibility with existing code.
/// </remarks>
internal static bool StartsWith(ReadOnlySpan<char> s, int len, string prefix)
{
return StartsWith(s.Slice(0, len), prefix.AsSpan());
}
/// <summary>
/// Returns true if the character array starts with the prefix.
/// </summary>
/// <param name="s"> 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>
/// <remarks>
/// LUCENENET NOTE: This method has been converted to use <see cref="ReadOnlySpan{T}"/>.
/// </remarks>
public static bool StartsWith(ReadOnlySpan<char> s, ReadOnlySpan<char> prefix)
{
int prefixLen = prefix.Length;
if (prefixLen > s.Length)
{
return false;
}
// LUCENENET: use more efficient implementation in MemoryExtensions
return s.StartsWith(prefix, StringComparison.Ordinal);
}
/// <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>
/// <remarks>
/// LUCENENET NOTE: This method has been converted to use <see cref="ReadOnlySpan{T}"/>.
/// Callers should prefer the overload without the <paramref name="len"/> parameter and use a slice instead,
/// but this overload is provided for compatibility with existing code.
/// </remarks>
internal static bool StartsWith(ReadOnlySpan<char> s, int len, ReadOnlySpan<char> prefix)
{
return StartsWith(s.Slice(0, len), prefix);
}
/// <summary>
/// Returns true if the character array ends with the suffix.
/// </summary>
/// <param name="s"> 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>
/// <remarks>
/// LUCENENET NOTE: This method has been converted to use <see cref="ReadOnlySpan{T}"/>.
/// </remarks>
public static bool EndsWith(ReadOnlySpan<char> s, string suffix)
{
return EndsWith(s, suffix.AsSpan());
}
/// <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>
/// <remarks>
/// LUCENENET NOTE: This method has been converted to use <see cref="ReadOnlySpan{T}"/>.
/// Callers should prefer the overload without the <paramref name="len"/> parameter and use a slice instead,
/// but this overload is provided for compatibility with existing code.
/// </remarks>
internal static bool EndsWith(ReadOnlySpan<char> s, int len, string suffix)
{
return EndsWith(s.Slice(0, len), suffix.AsSpan());
}
/// <summary>
/// Returns true if the character array ends with the suffix.
/// </summary>
/// <param name="s"> 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>
/// <remarks>
/// LUCENENET NOTE: This method has been converted to use <see cref="ReadOnlySpan{T}"/>.
/// </remarks>
public static bool EndsWith(ReadOnlySpan<char> s, ReadOnlySpan<char> suffix)
{
int suffixLen = suffix.Length;
if (suffixLen > s.Length)
{
return false;
}
// LUCENENET: use more efficient implementation in MemoryExtensions
return s.EndsWith(suffix, StringComparison.Ordinal);
}
/// <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>
/// <remarks>
/// LUCENENET NOTE: This method has been converted to use <see cref="ReadOnlySpan{T}"/>.
/// Callers should prefer the overload without the <paramref name="len"/> parameter and use a slice instead,
/// but this overload is provided for compatibility with existing code.
/// </remarks>
internal static bool EndsWith(ReadOnlySpan<char> s, int len, ReadOnlySpan<char> suffix)
{
return EndsWith(s.Slice(0, len), suffix);
}
// LUCENENET NOTE: char[] overload of EndsWith removed because the ReadOnlySpan<char> overload can be used instead
/// <summary>
/// Delete a character in-place
/// </summary>
/// <param name="s"> Input Buffer </param>
/// <param name="pos"> Position of character to delete </param>
/// <returns> length of input buffer after deletion </returns>
/// <remarks>
/// LUCENENET NOTE: This method has been converted to use <see cref="Span{T}"/>.
/// </remarks>
public static int Delete(Span<char> s, int pos)
{
if (Debugging.AssertsEnabled) Debugging.Assert(pos < s.Length);
if (pos < s.Length - 1) // don't arraycopy if asked to delete last character
{
Arrays.Copy(s, pos + 1, s, pos, s.Length - pos - 1);
}
return s.Length - 1;
}
/// <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>
/// <remarks>
/// LUCENENET NOTE: This method has been converted to use <see cref="Span{T}"/>.
/// Callers should prefer the overload without the <paramref name="len"/> parameter and use a slice instead,
/// but this overload is provided for compatibility with existing code.
/// </remarks>
internal static int Delete(Span<char> s, int pos, int len)
{
return Delete(s.Slice(0, len), pos);
}
/// <summary>
/// Delete n characters in-place
/// </summary>
/// <param name="s"> Input Buffer </param>
/// <param name="pos"> Position of character to delete </param>
/// <param name="nChars"> number of characters to delete </param>
/// <returns> length of input buffer after deletion </returns>
/// <remarks>
/// LUCENENET NOTE: This method has been converted to use <see cref="Span{T}"/>.
/// </remarks>
public static int DeleteN(Span<char> s, int pos, int nChars)
{
if (Debugging.AssertsEnabled) Debugging.Assert(pos + nChars <= s.Length);
if (pos + nChars < s.Length) // don't arraycopy if asked to delete the last characters
{
Arrays.Copy(s, pos + nChars, s, pos, s.Length - pos - nChars);
}
return s.Length - nChars;
}
/// <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>
/// <remarks>
/// LUCENENET NOTE: This method has been converted to use <see cref="Span{T}"/>.
/// </remarks>
internal static int DeleteN(Span<char> s, int pos, int len, int nChars)
{
return DeleteN(s.Slice(0, len), pos, nChars);
}
}
}