/// <summary>
/// 判断源字符串从指定位置开始是否有匹配的keyword
/// </summary>
/// <param name="source">源字符串</param>
/// <param name="index">指定位置</param>
/// <param name="keyWord">关键字</param>
/// <returns></returns>
private static string GetString(string source, ref int index, ReplaceItemCollection itemCollection)
{
string value = null;
int maxLen = itemCollection.MaxLength;
int minLen = itemCollection.MinLength;
int left = source.Length - index;
if (left < minLen)
{
return(value);
}
if (left < maxLen)
{
maxLen = left;
}
for (int i = maxLen; i >= minLen; i--)
{
string tmp = source.Substring(index, i);
if (itemCollection.TryGetValue(tmp, out value))
{
index += i;
break;
}
}
return(value);
}
/// <summary>
/// 替换集合的字符
/// </summary>
/// <param name="itemCollection">要替换的集合</param>
/// <returns></returns>
public static string Replace(string source, ReplaceItemCollection itemCollection)
{
StringBuilder sbRet = new StringBuilder(source.Length);
int index = 0;
int length = source.Length;
while (index < length)
{
string value = GetString(source, ref index, itemCollection);
if (value != null)
{
sbRet.Append(value);
}
else
{
sbRet.Append(source[index]);
index++;
}
}
return(sbRet.ToString());
}
