关于flutter:flutter-插件数字字符串计算库

string_num_calculate

一个用于计算数字字符串算式的库。
Calculate mathematical formula result from string.

可不便用于 app 制作虚构键盘，虚构计算器。
With this package, You can easily make virtual keyboard or virtual calculator for your APP.

已通过测试，可放心使用。
All tests passed, enjoy :)

API

Calculate
// Main Class

• static Map<String, Function> funs

定义的办法映射

• static List<String> toNumberList

  把字符串中的数字和算式符号提取为 list

  Extract numbers and operators from the string into a list

• static List<String> formatList

  把数字和算式符号列表中反复的符号去除

  Remove redundant operators from list

• static num LinierCalculate

  间接计算字符串式算式

  Calculate directly from string

• static num ListCalculate

  计算 list 式算式

  Calculate for list

• static num plus

  加法

  plus

• static num substract

  减法

  minus

• static num multiply

  乘法

  multiply

• static num divide

  除法

  divide

• static num percent

  生产或者百分式算法

  percentage

装置 Installation

在 pubspec.ymal 文件中退出，而后运行 pub get packages 命令。
Add this line into pubspec.ymal, then run pub get packages

dependencies:
  string_num_calculate: ^0.0.1

用法说明 Usage

import 'package:string_num_calculate/string_num_calculate.dart';// 引入

Calculate.plus(1, 2);//=>3
Calculate.substract(1, 2);//=>-1
Calculate.multiply(1, 2);//=>2
Calculate.divide(1, 2);//=>.5
Calculate.percent(1, 2);//=>0.02
Calculate.ListCalculate(['1', '-', '5']);//=>-4
Calculate.toNumberList('1-5');//=>['1','-','5']
Calculate.formatList(['1', '+', '-', '5']);//=>['1','-','5']
Calculate.LinierCalculate('1+3+5');//=>9

测试

// 加法计算 Plus
  test('static [plus]计算加', () {expect(Calculate.plus(1, 2), 3);
    expect(Calculate.plus(1, -2), -1);
    expect(Calculate.plus(-1, -2), -3);
    expect(Calculate.plus(-.1, -2), -2.1);
    expect(Calculate.plus(-.1, -0.2), -0.30000000000000004);
  });
  // 减法计算 Minus
  test('static [substract]计算减', () {expect(Calculate.substract(1, 2), -1);
    expect(Calculate.substract(.1, -2), 2.1);
    expect(Calculate.substract(0.1, -2), 2.1);
  });
  // 乘法计算 Multiply
  test('static [multiply]计算乘', () {expect(Calculate.multiply(1, 2), 2);
    expect(Calculate.multiply(1, -2), -2);
    expect(Calculate.multiply(1, 0), 0);
  });
  // 除法计算 Divide
  test('static [divide]计算除', () {expect(Calculate.divide(1, 2), .5);
    expect(Calculate.divide(1, -2), -.5);
  });
  // 小费计算 Tips
  test('static [percent]计算百分数', () {expect(Calculate.percent(1, 2), 0.02);
    expect(Calculate.percent(1, -2), -0.02);
    expect(Calculate.percent(100, 2), 2);
  });

  // 数字 list 计算 Calculate for list
  test('static [ListCalculate]数字 list 计算', () {expect(Calculate.ListCalculate(['1', '-', '5']), -4);
    expect(Calculate.ListCalculate(['1', '+', '5']), 6);
    expect(Calculate.ListCalculate(['-1', '×', '5']), -5);
    expect(Calculate.ListCalculate(['1', '%', '5']), 0.05);
  });
  // 数字字符串转换成数字 list Convert from string to list
  test('static [toNumberList]数字字符串转 list', () {expect(Calculate.toNumberList('1-5'), ['1', '-', '5']);
    expect(Calculate.toNumberList('-1+5'), ['-','1', '+', '5']);
    expect(Calculate.toNumberList('1×5'), ['1', '×', '5']);
    expect(Calculate.toNumberList('1%5'), ['1', '%', '5']);
  });
  // 数字 list 去除符号雷同 Remove redundant operators from list
  test('static [formatList]数字字符串转 list', () {expect(Calculate.formatList(['1', '+', '-', '5']), ['1', '-', '5']);
    expect(Calculate.formatList(['1', '+', '+', '5']), ['1', '+', '5']);
    expect(Calculate.formatList(['1', '+', '×', '5']), ['1', '×', '5']);
    expect(Calculate.formatList(['1', '+', '%', '5']), ['1', '%', '5']);
  });
  // 字符串计算 Calculate from string
  test('Calculate->[LinierCalculate]计算一个字符串计算', () {expect(Calculate.LinierCalculate('1+.3+5'), 6.3);
    expect(Calculate.LinierCalculate('-1+0.3+5'), 4.3);
    expect(Calculate.LinierCalculate('-1*3+5'), 2);
    expect(Calculate.LinierCalculate('-1/2+5'), 4.5);
  });