Flutter字符串统计插件string_stats的使用

string_stats 是一个用于计算字符串基本频率统计信息的Dart库。它支持异步或增量累积，并提供了诸如单词计数、字符计数、字符频率、单词频率、行计数等功能。

功能和类

实用函数

• allCharFrequency
• allPositionsWord
• allWordFrequency
• allWordsPositions
• charCount
• charFrequency
• emptyLineCount
• firstPositionWord
• lineCount
• nonEmptyLineCount
• statistics
• subStringFrequency
• wordCount
• wordFrequency

实用类

• AllCharFrequencyCounter
• AllWordFrequencyCounter
• CharCounter
• CharFrequencyCounter
• StatisticsCounter
• WordCounter
• WordFrequencyCounter

字符串扩展

• where(bool Function(String))
• isNumeric
• isPunctuation
• isChar
• isWhiteSpace
• generateUnicodeString

返回类

• StringStatistics

示例代码

以下是一个完整的示例，展示了如何使用string_stats中的各种功能和类。

import 'package:string_stats/string_stats.dart';

void main() {
  // 使用实用函数
  print(allCharFrequency('aabbcc')['a']); // 输出: 2

  print(allPositionsWord('mineral apple mineral coral mineral', 'mineral').last.start); // 输出: 28

  print(allWordFrequency('word word word duck duck')['word']); // 输出: 3

  print(allWordsPositions('mineral apple mineral coral mineral')['apple']!.length); // 输出: 1

  print(charCount('12345\n 6')); // 输出: 7

  print(charFrequency('aabaa aaa', 'a')); // 输出: 7

  print(emptyLineCount('\n\n')); // 输出: 3

  print(firstPositionWord(' word ', 'word')!.end); // 输出: 4

  print(lineCount('\nasdsd\n')); // 输出: 3

  print(nonEmptyLineCount('\nasdsd\n')); // 输出: 1

  final stats = statistics('\nword duck pond \n\n   \n martian');
  print(stats); // 输出: StringStatistics 对象

  print(subStringFrequency(' word      word    ', 'word')); // 输出: 2

  print(wordCount('12 345\n 6')); // 输出: 3

  print(wordFrequency(' word      word    ', 'word')); // 输出: 2

  // 使用实用类
  final allCharFreqCounter = AllCharFrequencyCounter();
  allCharFreqCounter.add('aabbcc');
  print(allCharFreqCounter.length); // 输出: 3
  print(allCharFreqCounter['a']); // 输出: 2

  final allWordFreqCounter = AllWordFrequencyCounter();
  allWordFreqCounter.add('word ');
  print(allWordFreqCounter.length); // 输出: 1
  allWordFreqCounter.add('word');
  print(allWordFreqCounter['word']); // 输出: 2

  final charCounter = CharCounter();
  charCounter.add(' 12345 ');
  print(charCounter.count); // 输出: 7
  charCounter.add('12 345\n 6');
  print(charCounter.count); // 输出: 15

  final charFreqCounter = CharFrequencyCounter('a');
  charFreqCounter.add('a');
  print(charFreqCounter.count); // 输出: 1
  charFreqCounter.add('a');
  print(charFreqCounter.count); // 输出: 2
  charFreqCounter.add('hfdtfdthfdh5 y');
  print(charFreqCounter.count); // 输出: 2

  final statisticsCounter = StatisticsCounter();
  statisticsCounter.add('\nword duck pond \n\n   \n martian');
  print(statisticsCounter.statistics); // 输出: StringStatistics 对象
  statisticsCounter.add('\nword duck pond \n\n   \n martian');
  print(statisticsCounter.statistics); // 输出: StringStatistics 对象

  final wordCounter = WordCounter();
  wordCounter.add(' 12345 ');
  print(wordCounter.count); // 输出: 1
  wordCounter.add('12 345\n 6');
  print(wordCounter.count); // 输出: 4

  final wordFreqCounter = WordFrequencyCounter('word');
  wordFreqCounter.add('word');
  print(wordFreqCounter.count); // 输出: 1
  wordFreqCounter.add(' word word word ');
  print(wordFreqCounter.count); // 输出: 4
}