using System.Collections;
using System.Diagnostics.CodeAnalysis;
using System.Text;
using NewLife.Collections;
namespace NewLife;
/// <summary>字符串助手类</summary>
/// <remarks>
/// 文档 https://newlifex.com/core/string_helper
/// </remarks>
public static class StringHelper
{
#region 字符串扩展
/// <summary>忽略大小写的字符串相等比较，判断是否与任意一个待比较字符串相等</summary>
/// <param name="value">字符串</param>
/// <param name="strs">待比较字符串数组</param>
/// <returns></returns>
public static Boolean EqualIgnoreCase(this String? value, params String?[] strs)
{
foreach (var item in strs)
{
if (String.Equals(value, item, StringComparison.OrdinalIgnoreCase)) return true;
}
return false;
}
/// <summary>忽略大小写的字符串开始比较，判断是否与任意一个待比较字符串开始</summary>
/// <param name="value">字符串</param>
/// <param name="strs">待比较字符串数组</param>
/// <returns></returns>
public static Boolean StartsWithIgnoreCase(this String? value, params String?[] strs)
{
if (value == null || String.IsNullOrEmpty(value)) return false;
foreach (var item in strs)
{
if (!String.IsNullOrEmpty(item) && value.StartsWith(item, StringComparison.OrdinalIgnoreCase)) return true;
}
return false;
}
/// <summary>忽略大小写的字符串结束比较，判断是否以任意一个待比较字符串结束</summary>
/// <param name="value">字符串</param>
/// <param name="strs">待比较字符串数组</param>
/// <returns></returns>
public static Boolean EndsWithIgnoreCase(this String? value, params String?[] strs)
{
if (value == null || String.IsNullOrEmpty(value)) return false;
foreach (var item in strs)
{
if (item != null && value.EndsWith(item, StringComparison.OrdinalIgnoreCase)) return true;
}
return false;
}
/// <summary>指示指定的字符串是 null 还是 String.Empty 字符串</summary>
/// <param name="value">字符串</param>
/// <returns></returns>
public static Boolean IsNullOrEmpty([NotNullWhen(false)] this String? value) => value == null || value.Length <= 0;
/// <summary>是否空或者空白字符串</summary>
/// <param name="value">字符串</param>
/// <returns></returns>
public static Boolean IsNullOrWhiteSpace([NotNullWhen(false)] this String? value)
{
if (value != null)
{
for (var i = 0; i < value.Length; i++)
{
if (!Char.IsWhiteSpace(value[i])) return false;
}
}
return true;
}
/// <summary>拆分字符串，过滤空格，无效时返回空数组</summary>
/// <param name="value">字符串</param>
/// <param name="separators">分组分隔符，默认逗号分号</param>
/// <returns></returns>
public static String[] Split(this String? value, params String[] separators)
{
//!! netcore3.0中新增Split(String? separator, StringSplitOptions options = StringSplitOptions.None)，优先于StringHelper扩展
if (value == null || String.IsNullOrEmpty(value)) return new String[0];
if (separators == null || separators.Length <= 0 || separators.Length == 1 && separators[0].IsNullOrEmpty()) separators = [",", ";"];
return value.Split(separators, StringSplitOptions.RemoveEmptyEntries);
}
/// <summary>拆分字符串成为整型数组，默认逗号分号分隔，无效时返回空数组</summary>
/// <remarks>过滤空格、过滤无效、不过滤重复</remarks>
/// <param name="value">字符串</param>
/// <param name="separators">分组分隔符，默认逗号分号</param>
/// <returns></returns>
public static Int32[] SplitAsInt(this String? value, params String[] separators)
{
if (value == null || String.IsNullOrEmpty(value)) return new Int32[0];
if (separators == null || separators.Length <= 0) separators = [",", ";"];
var ss = value.Split(separators, StringSplitOptions.RemoveEmptyEntries);
var list = new List<Int32>();
foreach (var item in ss)
{
if (!Int32.TryParse(item.Trim(), out var id)) continue;
// 本意只是拆分字符串然后转为数字，不应该过滤重复项
//if (!list.Contains(id))
list.Add(id);
}
return list.ToArray();
}
/// <summary>拆分字符串成为不区分大小写的可空名值字典。逗号分组，等号分隔</summary>
/// <param name="value">字符串</param>
/// <param name="nameValueSeparator">名值分隔符，默认等于号</param>
/// <param name="separator">分组分隔符，默认分号</param>
/// <param name="trimQuotation">去掉括号</param>
/// <returns></returns>
public static IDictionary<String, String> SplitAsDictionary(this String? value, String nameValueSeparator = "=", String separator = ";", Boolean trimQuotation = false)
{
var dic = new NullableDictionary<String, String>(StringComparer.OrdinalIgnoreCase);
if (value == null || value.IsNullOrWhiteSpace()) return dic;
if (nameValueSeparator.IsNullOrEmpty()) nameValueSeparator = "=";
//if (separator == null || separator.Length <= 0) separator = new String[] { ",", ";" };
var ss = value.Split(new[] { separator }, StringSplitOptions.RemoveEmptyEntries);
if (ss == null || ss.Length <= 0) return dic;
var k = 0;
foreach (var item in ss)
{
var p = item.IndexOf(nameValueSeparator);
if (p <= 0)
{
dic[$"[{k}]"] = item;
k++;
continue;
}
var key = item[..p].Trim();
var val = item[(p + nameValueSeparator.Length)..].Trim();
// 处理单引号双引号
if (trimQuotation && !val.IsNullOrEmpty())
{
if (val[0] == '\'' && val[^1] == '\'') val = val.Trim('\'');
if (val[0] == '"' && val[^1] == '"') val = val.Trim('"');
}
k++;
//dic[key] = val;
#if NETFRAMEWORK || NETSTANDARD2_0
if (!dic.ContainsKey(key)) dic.Add(key, val);
#else
dic.TryAdd(key, val);
#endif
}
return dic;
}
///// <summary>
///// 在.netCore需要区分该部分内容
///// </summary>
///// <param name="value"></param>
///// <param name="nameValueSeparator"></param>
///// <param name="separator"></param>
///// <param name="trimQuotation"></param>
///// <returns></returns>
//public static IDictionary<String, String> SplitAsDictionaryT(this String? value, Char nameValueSeparator = '=', Char separator = ';', Boolean trimQuotation = false)
//{
// var dic = new NullableDictionary<String, String>(StringComparer.OrdinalIgnoreCase);
// if (value == null || value.IsNullOrWhiteSpace()) return dic;
// //if (nameValueSeparator == null) nameValueSeparator = '=';
// //if (separator == null || separator.Length <= 0) separator = new String[] { ",", ";" };
// var ss = value.Split(new[] { separator }, StringSplitOptions.RemoveEmptyEntries);
// if (ss == null || ss.Length <= 0) return dic;
// foreach (var item in ss)
// {
// var p = item.IndexOf(nameValueSeparator);
// if (p <= 0) continue;
// var key = item[..p].Trim();
// var val = item[(p + 1)..].Trim();
// // 处理单引号双引号
// if (trimQuotation && !val.IsNullOrEmpty())
// {
// if (val[0] == '\'' && val[^1] == '\'') val = val.Trim('\'');
// if (val[0] == '"' && val[^1] == '"') val = val.Trim('"');
// }
// dic[key] = val;
// }
// return dic;
//}
/// <summary>把一个列表组合成为一个字符串，默认逗号分隔</summary>
/// <param name="value"></param>
/// <param name="separator">组合分隔符，默认逗号</param>
/// <returns></returns>
public static String Join(this IEnumerable value, String separator = ",")
{
var sb = Pool.StringBuilder.Get();
if (value != null)
{
foreach (var item in value)
{
sb.Separate(separator).Append(item + "");
}
}
return sb.Put(true);
}
///// <summary>把一个列表组合成为一个字符串，默认逗号分隔</summary>
///// <param name="value"></param>
///// <param name="separator">组合分隔符，默认逗号</param>
///// <param name="func">把对象转为字符串的委托</param>
///// <returns></returns>
//[Obsolete]
//public static String Join<T>(this IEnumerable<T> value, String separator, Func<T, String>? func)
//{
// var sb = Pool.StringBuilder.Get();
// if (value != null)
// {
// if (func == null) func = obj => obj + "";
// foreach (var item in value)
// {
// sb.Separate(separator).Append(func(item));
// }
// }
// return sb.Put(true);
//}
/// <summary>把一个列表组合成为一个字符串，默认逗号分隔</summary>
/// <param name="value"></param>
/// <param name="separator">组合分隔符，默认逗号</param>
/// <param name="func">把对象转为字符串的委托</param>
/// <returns></returns>
public static String Join<T>(this IEnumerable<T> value, String separator = ",", Func<T, Object?>? func = null)
{
var sb = Pool.StringBuilder.Get();
if (value != null)
{
func ??= obj => obj;
foreach (var item in value)
{
sb.Separate(separator).Append(func(item));
}
}
return sb.Put(true);
}
/// <summary>追加分隔符字符串，忽略开头，常用于拼接</summary>
/// <param name="sb">字符串构造者</param>
/// <param name="separator">分隔符</param>
/// <returns></returns>
public static StringBuilder Separate(this StringBuilder sb, String separator)
{
if (/*sb == null ||*/ String.IsNullOrEmpty(separator)) return sb;
if (sb.Length > 0) sb.Append(separator);
return sb;
}
/// <summary>字符串转数组</summary>
/// <param name="value">字符串</param>
/// <param name="encoding">编码，默认utf-8无BOM</param>
/// <returns></returns>
public static Byte[] GetBytes(this String? value, Encoding? encoding = null)
{
//if (value == null) return null;
if (String.IsNullOrEmpty(value)) return new Byte[0];
encoding ??= Encoding.UTF8;
return encoding.GetBytes(value);
}
/// <summary>格式化字符串。特别支持无格式化字符串的时间参数</summary>
/// <param name="value">格式字符串</param>
/// <param name="args">参数</param>
/// <returns></returns>
[Obsolete("建议使用插值字符串")]
public static String F(this String value, params Object?[] args)
{
if (String.IsNullOrEmpty(value)) return value;
// 特殊处理时间格式化。这些年，无数项目实施因为时间格式问题让人发狂
for (var i = 0; i < args.Length; i++)
{
if (args[i] is DateTime dt)
{
// 没有写格式化字符串的时间参数，一律转为标准时间字符串
if (value.Contains("{" + i + "}")) args[i] = dt.ToFullString();
}
}
return String.Format(value, args);
}
/// <summary>指定输入是否匹配目标表达式，支持*匹配</summary>
/// <param name="pattern">匹配表达式</param>
/// <param name="input">输入字符串</param>
/// <param name="comparisonType">字符串比较方式</param>
/// <returns></returns>
public static Boolean IsMatch(this String pattern, String input, StringComparison comparisonType = StringComparison.CurrentCulture)
{
if (pattern.IsNullOrEmpty()) return false;
// 单独*匹配所有，即使输入字符串为空
if (pattern == "*") return true;
if (input.IsNullOrEmpty()) return false;
// 普通表达式，直接包含
var p = pattern.IndexOf('*');
if (p < 0) return String.Equals(input, pattern, comparisonType);
// 表达式分组
var ps = pattern.Split('*');
// 头尾专用匹配
if (ps.Length == 2)
{
if (p == 0) return input.EndsWith(ps[1], comparisonType);
if (p == pattern.Length - 1) return input.StartsWith(ps[0], comparisonType);
}
// 逐项跳跃式匹配
p = 0;
for (var i = 0; i < ps.Length; i++)
{
// 最后一组反向匹配
if (i == ps.Length - 1)
p = input.LastIndexOf(ps[i], input.Length - 1, input.Length - p, comparisonType);
else
p = input.IndexOf(ps[i], p, comparisonType);
if (p < 0) return false;
// 第一组必须开头
if (i == 0 && p > 0) return false;
p += ps[i].Length;
}
// 最后一组*允许不到边界
if (ps[^1].IsNullOrEmpty()) return p <= input.Length;
// 最后一组必须结尾
return p == input.Length;
}
#if NETFRAMEWORK || NETSTANDARD2_0
/// <summary>Returns a value indicating whether a specified character occurs within this string.</summary>
/// <param name="value"></param>
/// <param name="inputChar">The character to seek.</param>
/// <returns>
/// <see langword="true" /> if the <paramref name="inputChar" /> parameter occurs within this string; otherwise, <see langword="false" />.</returns>
public static Boolean Contains(this String value, Char inputChar) => value.IndexOf(inputChar) >= 0;
/// <summary>Splits a string into substrings based on the characters in an array. You can specify whether the substrings include empty array elements.</summary>
/// <param name="value"></param>
/// <param name="separator">A character array that delimits the substrings in this string, an empty array that contains no delimiters, or <see langword="null" />.</param>
/// <param name="options">
/// <see cref="F:System.StringSplitOptions.RemoveEmptyEntries" /> to omit empty array elements from the array returned; or <see cref="F:System.StringSplitOptions.None" /> to include empty array elements in the array returned.</param>
/// <returns>An array whose elements contain the substrings in this string that are delimited by one or more characters in <paramref name="separator" />. For more information, see the Remarks section.</returns>
/// <exception cref="T:System.ArgumentException">
/// <paramref name="options" /> is not one of the <see cref="T:System.StringSplitOptions" /> values.</exception>
public static String[] Split(this String value, Char separator, StringSplitOptions options = StringSplitOptions.None) => value.Split(new Char[] { separator }, options);
#endif
#endregion
#region 截取扩展
/// <summary>确保字符串以指定的另一字符串开始，不区分大小写</summary>
/// <param name="str">字符串</param>
/// <param name="start"></param>
/// <returns></returns>
public static String EnsureStart(this String? str, String start)
{
if (String.IsNullOrEmpty(start)) return str + "";
if (String.IsNullOrEmpty(str) || str == null) return start + "";
if (str.StartsWith(start, StringComparison.OrdinalIgnoreCase)) return str;
return start + str;
}
/// <summary>确保字符串以指定的另一字符串结束，不区分大小写</summary>
/// <param name="str">字符串</param>
/// <param name="end"></param>
/// <returns></returns>
public static String EnsureEnd(this String? str, String end)
{
if (String.IsNullOrEmpty(end)) return str + "";
if (String.IsNullOrEmpty(str) || str == null) return end + "";
if (str.EndsWith(end, StringComparison.OrdinalIgnoreCase)) return str;
return str + end;
}
/// <summary>从当前字符串开头移除另一字符串，不区分大小写，循环多次匹配前缀</summary>
/// <param name="str">当前字符串</param>
/// <param name="starts">另一字符串</param>
/// <returns></returns>
public static String TrimStart(this String str, params String[] starts)
{
if (String.IsNullOrEmpty(str)) return str;
if (starts == null || starts.Length <= 0 || String.IsNullOrEmpty(starts[0])) return str;
for (var i = 0; i < starts.Length; i++)
{
if (str.StartsWith(starts[i], StringComparison.OrdinalIgnoreCase))
{
str = str[starts[i].Length..];
if (String.IsNullOrEmpty(str)) break;
// 从头开始
i = -1;
}
}
return str;
}
/// <summary>从当前字符串结尾移除另一字符串，不区分大小写，循环多次匹配后缀</summary>
/// <param name="str">当前字符串</param>
/// <param name="ends">另一字符串</param>
/// <returns></returns>
public static String TrimEnd(this String str, params String[] ends)
{
if (String.IsNullOrEmpty(str)) return str;
if (ends == null || ends.Length <= 0 || String.IsNullOrEmpty(ends[0])) return str;
for (var i = 0; i < ends.Length; i++)
{
if (str.EndsWith(ends[i], StringComparison.OrdinalIgnoreCase))
{
str = str[..^ends[i].Length];
if (String.IsNullOrEmpty(str)) break;
// 从头开始
i = -1;
}
}
return str;
}
/// <summary>修剪不可见字符。仅修剪ASCII，不包含Unicode</summary>
/// <param name="value"></param>
/// <returns></returns>
public static String? TrimInvisible(this String? value)
{
if (value.IsNullOrEmpty()) return value;
var builder = new StringBuilder();
for (var i = 0; i < value.Length; i++)
{
// 可见字符。ASCII码中，第0～31号及第127号(共33个)是控制字符或通讯专用字符
if (value[i] is > (Char)31 and not (Char)127)
builder.Append(value[i]);
}
return builder.ToString();
}
/// <summary>从字符串中检索子字符串，在指定头部字符串之后，指定尾部字符串之前</summary>
/// <remarks>常用于截取xml某一个元素等操作</remarks>
/// <param name="str">目标字符串</param>
/// <param name="after">头部字符串，在它之后</param>
/// <param name="before">尾部字符串，在它之前</param>
/// <param name="startIndex">搜索的开始位置</param>
/// <param name="positions">位置数组，两个元素分别记录头尾位置</param>
/// <returns></returns>
public static String Substring(this String str, String? after, String? before = null, Int32 startIndex = 0, Int32[]? positions = null)
{
if (String.IsNullOrEmpty(str)) return str;
if (String.IsNullOrEmpty(after) && String.IsNullOrEmpty(before)) return str;
/*
* 1，只有start，从该字符串之后部分
* 2，只有end，从开头到该字符串之前
* 3，同时start和end，取中间部分
*/
var p = -1;
if (!after.IsNullOrEmpty())
{
p = str.IndexOf(after, startIndex);
if (p < 0) return String.Empty;
p += after.Length;
// 记录位置
if (positions != null && positions.Length > 0) positions[0] = p;
}
if (String.IsNullOrEmpty(before)) return str[p..];
var f = str.IndexOf(before, p >= 0 ? p : startIndex);
if (f < 0) return String.Empty;
// 记录位置
if (positions != null && positions.Length > 1) positions[1] = f;
if (p >= 0)
return str[p..f];
else
return str[..f];
}
/// <summary>根据最大长度截取字符串，并允许以指定空白填充末尾</summary>
/// <param name="str">字符串</param>
/// <param name="maxLength">截取后字符串的最大允许长度，包含后面填充</param>
/// <param name="pad">需要填充在后面的字符串，比如几个圆点</param>
/// <returns></returns>
public static String Cut(this String str, Int32 maxLength, String? pad = null)
{
if (String.IsNullOrEmpty(str) || maxLength <= 0 || str.Length < maxLength) return str;
// 计算截取长度
var len = maxLength;
if (pad != null && !String.IsNullOrEmpty(pad)) len -= pad.Length;
if (len <= 0) throw new ArgumentOutOfRangeException(nameof(maxLength));
return str[..len] + pad;
}
/// <summary>从当前字符串开头移除另一字符串以及之前的部分</summary>
/// <param name="str">当前字符串</param>
/// <param name="starts">另一字符串</param>
/// <returns></returns>
public static String CutStart(this String str, params String[] starts)
{
if (str.IsNullOrEmpty()) return str;
if (starts == null || starts.Length <= 0 || starts[0].IsNullOrEmpty()) return str;
for (var i = 0; i < starts.Length; i++)
{
var p = str.IndexOf(starts[i]);
if (p >= 0)
{
str = str[(p + starts[i].Length)..];
if (str.IsNullOrEmpty()) break;
}
}
return str;
}
/// <summary>从当前字符串结尾移除另一字符串以及之后的部分</summary>
/// <param name="str">当前字符串</param>
/// <param name="ends">另一字符串</param>
/// <returns></returns>
public static String CutEnd(this String str, params String[] ends)
{
if (String.IsNullOrEmpty(str)) return str;
if (ends == null || ends.Length <= 0 || String.IsNullOrEmpty(ends[0])) return str;
for (var i = 0; i < ends.Length; i++)
{
var p = str.LastIndexOf(ends[i]);
if (p >= 0)
{
str = str[..p];
if (String.IsNullOrEmpty(str)) break;
}
}
return str;
}
#endregion
#region LD编辑距离算法
/// <summary>编辑距离搜索，从词组中找到最接近关键字的若干匹配项</summary>
/// <remarks>
/// 算法代码由@Aimeast 独立完成。http://www.cnblogs.com/Aimeast/archive/2011/09/05/2167844.html
/// </remarks>
/// <param name="key">关键字</param>
/// <param name="words">词组</param>
/// <returns></returns>
public static String[] LevenshteinSearch(String key, String[] words)
{
if (IsNullOrWhiteSpace(key)) return new String[0];
var keys = key.Split(new Char[] { ' ', ' ' }, StringSplitOptions.RemoveEmptyEntries);
foreach (var item in keys)
{
var maxDist = (item.Length - 1) / 2;
var q = from str in words
where item.Length <= str.Length
&& Enumerable.Range(0, maxDist + 1)
.Any(dist =>
{
return Enumerable.Range(0, Math.Max(str.Length - item.Length - dist + 1, 0))
.Any(f =>
{
return LevenshteinDistance(item, str.Substring(f, item.Length + dist)) <= maxDist;
});
})
orderby str
select str;
words = q.ToArray();
}
return words;
}
/// <summary>编辑距离</summary>
/// <remarks>
/// 又称Levenshtein距离（也叫做Edit Distance），是指两个字串之间，由一个转成另一个所需的最少编辑操作次数。
/// 许可的编辑操作包括将一个字符替换成另一个字符，插入一个字符，删除一个字符。
/// 算法代码由@Aimeast 独立完成。http://www.cnblogs.com/Aimeast/archive/2011/09/05/2167844.html
/// </remarks>
/// <param name="str1"></param>
/// <param name="str2"></param>
/// <returns></returns>
public static Int32 LevenshteinDistance(String str1, String str2)
{
var n = str1.Length;
var m = str2.Length;
var C = new Int32[n + 1, m + 1];
Int32 i, j, x, y, z;
for (i = 0; i <= n; i++)
C[i, 0] = i;
for (i = 1; i <= m; i++)
C[0, i] = i;
for (i = 0; i < n; i++)
for (j = 0; j < m; j++)
{
x = C[i, j + 1] + 1;
y = C[i + 1, j] + 1;
if (str1[i] == str2[j])
z = C[i, j];
else
z = C[i, j] + 1;
C[i + 1, j + 1] = Math.Min(Math.Min(x, y), z);
}
return C[n, m];
}
#endregion
#region LCS算法
/// <summary>最长公共子序列搜索，从词组中找到最接近关键字的若干匹配项</summary>
/// <remarks>
/// 算法代码由@Aimeast 独立完成。http://www.cnblogs.com/Aimeast/archive/2011/09/05/2167844.html
/// </remarks>
/// <param name="key"></param>
/// <param name="words"></param>
/// <returns></returns>
public static String[] LCSSearch(String key, String[] words)
{
if (IsNullOrWhiteSpace(key) || words == null || words.Length == 0) return new String[0];
var keys = key
.Split(new Char[] { ' ', '\u3000' }, StringSplitOptions.RemoveEmptyEntries)
.OrderBy(s => s.Length)
.ToArray();
//var q = from sentence in items.AsParallel()
var q = from word in words
let MLL = LCSDistance(word, keys)
where MLL >= 0
orderby (MLL + 0.5) / word.Length, word
select word;
return q.ToArray();
}
/// <summary>
/// 最长公共子序列问题是寻找两个或多个已知数列最长的子序列。
/// 一个数列 S，如果分别是两个或多个已知数列的子序列，且是所有符合此条件序列中最长的，则 S 称为已知序列的最长公共子序列。
/// The longest common subsequence (LCS) problem is to find the longest subsequence common to all sequences in a set of sequences (often just two). Note that subsequence is different from a substring, see substring vs. subsequence. It is a classic computer science problem, the basis of diff (a file comparison program that outputs the differences between two files), and has applications in bioinformatics.
/// </summary>
/// <remarks>
/// 算法代码由@Aimeast 独立完成。http://www.cnblogs.com/Aimeast/archive/2011/09/05/2167844.html
/// </remarks>
/// <param name="word"></param>
/// <param name="keys">多个关键字。长度必须大于0，必须按照字符串长度升序排列。</param>
/// <returns></returns>
public static Int32 LCSDistance(String word, String[] keys)
{
var sLength = word.Length;
var result = sLength;
var flags = new Boolean[sLength];
var C = new Int32[sLength + 1, keys[^1].Length + 1];
//int[,] C = new int[sLength + 1, words.Select(s => s.Length).Max() + 1];
foreach (var key in keys)
{
var wLength = key.Length;
Int32 first = 0, last = 0;
Int32 i = 0, j = 0, LCS_L;
//foreach 速度会有所提升，还可以加剪枝
for (i = 0; i < sLength; i++)
for (j = 0; j < wLength; j++)
if (word[i] == key[j])
{
C[i + 1, j + 1] = C[i, j] + 1;
if (first < C[i, j])
{
last = i;
first = C[i, j];
}
}
else
C[i + 1, j + 1] = Math.Max(C[i, j + 1], C[i + 1, j]);
LCS_L = C[i, j];
if (LCS_L <= wLength >> 1)
return -1;
while (i > 0 && j > 0)
{
if (C[i - 1, j - 1] + 1 == C[i, j])
{
i--;
j--;
if (!flags[i])
{
flags[i] = true;
result--;
}
first = i;
}
else if (C[i - 1, j] == C[i, j])
i--;
else// if (C[i, j - 1] == C[i, j])
j--;
}
if (LCS_L <= (last - first + 1) >> 1)
return -1;
}
return result;
}
/// <summary>根据列表项成员计算距离</summary>
/// <typeparam name="T"></typeparam>
/// <param name="list"></param>
/// <param name="keys"></param>
/// <param name="keySelector"></param>
/// <returns></returns>
public static IEnumerable<KeyValuePair<T, Double>> LCS<T>(this IEnumerable<T> list, String keys, Func<T, String> keySelector)
{
var rs = new List<KeyValuePair<T, Double>>();
if (list == null || !list.Any()) return rs;
if (keys.IsNullOrWhiteSpace()) return rs;
if (keySelector == null) throw new ArgumentNullException(nameof(keySelector));
var ks = keys.Split(' ').OrderBy(_ => _.Length).ToArray();
// 计算每个项到关键字的距离
foreach (var item in list)
{
var name = keySelector(item);
if (name.IsNullOrEmpty()) continue;
var dist = LCSDistance(name, ks);
if (dist >= 0)
{
var val = (Double)dist / name.Length;
rs.Add(new KeyValuePair<T, Double>(item, val));
}
}
//return rs.OrderBy(e => e.Value);
return rs;
}
/// <summary>在列表项中进行模糊搜索</summary>
/// <typeparam name="T"></typeparam>
/// <param name="list"></param>
/// <param name="keys"></param>
/// <param name="keySelector"></param>
/// <param name="count"></param>
/// <returns></returns>
public static IEnumerable<T> LCSSearch<T>(this IEnumerable<T> list, String keys, Func<T, String> keySelector, Int32 count = -1)
{
var rs = LCS(list, keys, keySelector);
if (count >= 0)
rs = rs.OrderBy(e => e.Value).Take(count);
else
rs = rs.OrderBy(e => e.Value);
return rs.Select(e => e.Key);
}
#endregion
#region 字符串模糊匹配
/// <summary>模糊匹配</summary>
/// <typeparam name="T"></typeparam>
/// <param name="list"></param>
/// <param name="keys"></param>
/// <param name="keySelector"></param>
/// <returns></returns>
public static IList<KeyValuePair<T, Double>> Match<T>(this IEnumerable<T> list, String keys, Func<T, String> keySelector)
{
var rs = new List<KeyValuePair<T, Double>>();
if (list == null || !list.Any()) return rs;
if (keys.IsNullOrWhiteSpace()) return rs;
if (keySelector == null) throw new ArgumentNullException(nameof(keySelector));
var ks = keys.Split(' ').OrderBy(_ => _.Length).ToArray();
// 计算每个项到关键字的权重
foreach (var item in list)
{
var name = keySelector(item);
if (name.IsNullOrEmpty()) continue;
var dist = ks.Sum(e =>
{
var kv = Match(name, e, e.Length);
return kv.Key - kv.Value * 0.1;
});
if (dist > 0)
{
var val = dist / keys.Length;
//var val = dist;
rs.Add(new KeyValuePair<T, Double>(item, val));
}
}
return rs;
}
/// <summary>模糊匹配</summary>
/// <param name="str"></param>
/// <param name="key"></param>
/// <param name="maxError"></param>
/// <returns></returns>
public static KeyValuePair<Int32, Int32> Match(String str, String key, Int32 maxError = 0)
{
/*
* 字符串 abcdef
* 少字符 ace (3, 0)
* 多字符 abkcd (4, 1)
* 改字符 abmd (3, 1)
*/
// str下一次要匹配的位置
var m = 0;
// key下一次要匹配的位置
var k = 0;
// 总匹配数
var match = 0;
// 跳过次数
var skip = 0;
while (skip <= maxError && k < key.Length)
{
// 向前逐个匹配
for (var i = m; i < str.Length; i++)
{
if (str[i] == key[k])
{
k++;
m = i + 1;
match++;
// 如果已完全匹配，则结束
if (k == key.Length) break;
}
}
// 如果已完全匹配，则结束
if (k == key.Length) break;
// 没有完全匹配，跳过关键字中的一个字符串，从上一次匹配后面继续找
k++;
skip++;
}
return new KeyValuePair<Int32, Int32>(match, skip);
}
/// <summary>模糊匹配</summary>
/// <typeparam name="T"></typeparam>
/// <param name="list">列表项</param>
/// <param name="keys">关键字</param>
/// <param name="keySelector">匹配字符串选择</param>
/// <param name="count">获取个数</param>
/// <param name="confidence">权重阀值</param>
/// <returns></returns>
public static IEnumerable<T> Match<T>(this IEnumerable<T> list, String keys, Func<T, String> keySelector, Int32 count, Double confidence = 0.5)
{
var rs = Match(list, keys, keySelector).Where(e => e.Value >= confidence);
if (count >= 0)
rs = rs.OrderByDescending(e => e.Value).Take(count);
else
rs = rs.OrderByDescending(e => e.Value);
return rs.Select(e => e.Key);
}
#endregion
#region 文字转语音
private static NewLife.Extension.SpeakProvider? _provider;
//private static System.Speech.Synthesis.SpeechSynthesizer _provider;
[MemberNotNull(nameof(_provider))]
static void Init()
{
//_provider = new Speech.Synthesis.SpeechSynthesizer();
//_provider.SetOutputToDefaultAudioDevice();
_provider ??= new NewLife.Extension.SpeakProvider();
}
/// <summary>调用语音引擎说出指定话</summary>
/// <param name="value"></param>
public static void Speak(this String value)
{
Init();
_provider.Speak(value);
}
/// <summary>异步调用语音引擎说出指定话。可能导致后来的调用打断前面的语音</summary>
/// <param name="value"></param>
public static void SpeakAsync(this String value)
{
Init();
_provider.SpeakAsync(value);
}
/// <summary>启用语音提示</summary>
public static Boolean EnableSpeechTip { get; set; } = true;
/// <summary>语音提示操作</summary>
/// <param name="value"></param>
public static void SpeechTip(this String value)
{
if (!EnableSpeechTip) return;
try
{
SpeakAsync(value);
}
catch { }
}
/// <summary>
/// 停止所有语音播报
/// </summary>
/// <param name="value"></param>
public static String SpeakAsyncCancelAll(this String value)
{
Init();
_provider.SpeakAsyncCancelAll();
return value;
}
#endregion
}
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