public void EmptyCharSet_RemoveCharacterRange_Success()
{
var charset = new CharSet();
charset.Remove('a', 'c');
Assert.AreEqual(0, charset.Length);
}
public void ThreeCharsSet_RemoveCharacterRangeExact_Success()
{
var charset = new CharSet();
charset.Add('a', 'c');
charset.Remove('a', 'c');
Assert.AreEqual(0, charset.Length);
}
public void OneCharSet_RemoveSingleCharacter_Success()
{
var charset = new CharSet();
charset.Add('a');
charset.Remove('a');
Assert.AreEqual(0, charset.Length);
}
public void ThreeCharsSet_RemoveCharacterRangeOverlapRight_Success()
{
var charset = new CharSet();
charset.Add('a', 'c');
charset.Remove('b', 'd');
Assert.AreEqual(1, charset.Length);
Assert.IsTrue(charset.Includes('a'));
}
public void ThreeCharsSet_RemoveSingleCharacterRight_Success()
{
var charset = new CharSet();
charset.Add('a', 'c');
charset.Remove('c');
Assert.AreEqual(2, charset.Length);
Assert.IsTrue(charset.Includes('a'));
Assert.IsTrue(charset.Includes('b'));
}
/// <summary>
/// 返回指定的字符对应的字符类索引。
/// </summary>
/// <param name="ch">要获取字符类索引的字符。</param>
/// <returns>字符对应的字符类索引。</returns>
public HashSet <int> GetCharClass(char ch)
{
int cnt = charClassList.Count;
HashSet <int> result = new HashSet <int>();
for (int i = 0; i < cnt; i++)
{
CharSet cc = charClassList[i];
if (cc.Contains(ch))
{
if (cc.Count == 1)
{
// 完全包含当前字符类，直接添加。
result.Add(i);
}
else
{
// 当前的字符类需要被分割，从当前的字符类中剔除被分割的部分。
cc.Remove(ch);
// 添加新字符类。
int newCC = charClassList.Count;
result.Add(newCC);
charClassList.Add(new CharSet()
{
ch
});
// 这里虽然在 charClassRecord 里添加了新的项，但完全没有必要记录。
// 因为当前的字符类只包含一个字符，不可能再被分割了。
charClassRecord.Add(null);
// 更新旧的字符类。
List <HashSet <int> > record = charClassRecord[i];
int rCnt = record.Count;
for (int j = 0; j < rCnt; j++)
{
record[j].Add(newCC);
}
}
}
}
return(result);
}
/// <summary>
/// Static constructor.
/// </summary>
static SubFieldCode()
{
_validCodes = new CharSet();
_validCodes.AddRange(DefaultFirstCode, DefaultLastCode);
_validCodes.Remove('^');
}
