- using System;
- public class Document
- {
- // 以下类型允许文档的查看方式与字的数组一样:
- public class WordCollection
- {
- readonly Document document; // 包含文档
- internal WordCollection(Document d)
- {
- document = d;
- }
- // Helper 函数 -- 从字符“begin”开始在字符数组“text”中搜索
- // 字数“wordCount”。如果字数小于 wordCount,
- // 则返回 false。将“start”和
- // “length”设置为单词在文本中的位置和长度:
- private bool GetWord(char[] text, int begin, int wordCount,
- out int start, out int length)
- {
- int end = text.Length;
- int count = 0;
- int inWord = -1;
- start = length = 0;
- for (int i = begin; i <= end; ++i)
- {
- bool isLetter = i < end && Char.IsLetterOrDigit(text[i]);
- if (inWord >= 0)
- {
- if (!isLetter)
- {
- if (count++ == wordCount)
- {
- start = inWord;
- length = i - inWord;
- return true;
- }
- inWord = -1;
- }
- }
- else
- {
- if (isLetter)
- inWord = i;
- }
- }
- return false;
- }
- // 获取和设置包含文档中的字的索引器:
- public string this[int index]
- {
- get
- {
- int start, length;
- if (GetWord(document.TextArray, 0, index, out start,
- out length))
- return new string(document.TextArray, start, length);
- else
- throw new IndexOutOfRangeException();
- }
- set
- {
- int start, length;
- if (GetWord(document.TextArray, 0, index, out start,
- out length))
- {
- // 用字符串“value”替换位于 start/length 处的
- // 字:
- if (length == value.Length)
- {
- Array.Copy(value.ToCharArray(), 0,
- document.TextArray, start, length);
- }
- else
- {
- char[] newText =
- new char[document.TextArray.Length +
- value.Length - length];
- Array.Copy(document.TextArray, 0, newText,
- 0, start);
- Array.Copy(value.ToCharArray(), 0, newText,
- start, value.Length);
- Array.Copy(document.TextArray, start + length,
- newText, start + value.Length,
- document.TextArray.Length - start
- - length);
- document.TextArray = newText;
- }
- }
- else
- throw new IndexOutOfRangeException();
- }
- }
- // 获取包含文档中字的计数:
- public int Count
- {
- get
- {
- int count = 0, start = 0, length = 0;
- while (GetWord(document.TextArray, start + length, 0,
- out start, out length))
- ++count;
- return count;
- }
- }
- }
- // 以下类型允许文档的查看方式像字符的“数组”
- // 一样:
- public class CharacterCollection
- {
- readonly Document document; // 包含文档
- internal CharacterCollection(Document d)
- {
- document = d;
- }
- // 获取和设置包含文档中的字符的索引器:
- public char this[int index]
- {
- get
- {
- return document.TextArray[index];
- }
- set
- {
- document.TextArray[index] = value;
- }
- }
- // 获取包含文档中字符的计数:
- public int Count
- {
- get
- {
- return document.TextArray.Length;
- }
- }
- }
- // 由于字段的类型具有索引器,
- // 因此这些字段显示为“索引属性”:
- public WordCollection Words;
- public CharacterCollection Characters;
- private char[] TextArray; // 文档的文本。
- public Document(string initialText)
- {
- TextArray = initialText.ToCharArray();
- Words = new WordCollection(this);
- Characters = new CharacterCollection(this);
- }
- public string Text
- {
- get
- {
- return new string(TextArray);
- }
- }
- }
- class Test
- {
- static void Main()
- {
- Document d = new Document(
- "peter piper picked a peck of pickled peppers. How many pickled peppers did peter piper pick?"
- );
- // 将字“peter”更改为“penelope”:
- for (int i = 0; i < d.Words.Count; ++i)
- {
- if (d.Words[i] == "peter")
- d.Words[i] = "penelope";
- }
- // 将字符“p”更改为“P”
- for (int i = 0; i < d.Characters.Count; ++i)
- {
- if (d.Characters[i] == 'p')
- d.Characters[i] = 'P';
- }
- Console.WriteLine(d.Text);
- }
- }
- //该片段来自于http://www.codesnippet.cn/detail/271120137552.html
来源: http://www.codesnippet.cn/detail/271120137552.html