string_num_calculate 0.0.2

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string_num_calculate #

一个用于计算数字字符串算式的库。

可方便用于app制作虚拟键盘,虚拟计算器。

已通过测试,可放心使用。

构成 #

Calculate
//主类
  - static Map<String, Function> funs
  定义的方法映射

  - static List<String> toNumberList
  把字符串中的数字和算式符号提取为list
  
  - static List<String> formatList
  把数字和算式符号列表中重复的符号去除

  - static num LinierCalculate
  直接计算字符串式算式

  - static num ListCalculate
  计算list式算式

  - static num plus
  加法

  - static num substract
  减法

  - static num multiply
  乘法
  
  - static num divide
  除法

  - static num percent
  消费或者百分式算法

安装 #

在pubspec.ymal文件中加入,然后运行pub get packages命令。

dependencies:
  string_num_calculate: ^0.0.1

用法说明 #

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
  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
  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
  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
  test('static [divide]计算除', () {
    expect(Calculate.divide(1, 2), .5);
    expect(Calculate.divide(1, -2), -.5);
  });
  // 小费计算
  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
  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
  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去除符号相同
  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
  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);
  });

版本 v0.0.2 #

完善说明及测试

版本 0.0.1 #

第一个版

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:


dependencies:
  string_num_calculate: ^0.0.2

2. Install it

You can install packages from the command line:

with pub:


$ pub get

with Flutter:


$ flutter pub get

Alternatively, your editor might support pub get or flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:


import 'package:string_num_calculate/string_num_calculate.dart';
  
Popularity:
Describes how popular the package is relative to other packages. [more]
0
Health:
Code health derived from static analysis. [more]
100
Maintenance:
Reflects how tidy and up-to-date the package is. [more]
40
Overall:
Weighted score of the above. [more]
38
Learn more about scoring.

We analyzed this package on Mar 28, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.1
  • pana: 0.13.6

Health suggestions

Fix lib/src/calculate.dart. (-0.50 points)

Analysis of lib/src/calculate.dart reported 1 hint:

line 78 col 16: Use isEmpty instead of length

Maintenance issues and suggestions

The description contains too many non-ASCII characters. (-20 points)

The site uses English as its primary language. The value of the description field in your package's pubspec.yaml field should primarily contain characters used in English.

The package description is too short. (-20 points)

Add more detail to the description field of pubspec.yaml. Use 60 to 180 characters to describe the package, what it does, and its target use case.

Maintain an example. (-10 points)

Create a short demo in the example/ directory to show how to use this package.

Common filename patterns include main.dart, example.dart, and string_num_calculate.dart. Packages with multiple examples should provide example/README.md.

For more information see the pub package layout conventions.

Package is pre-v0.1 release. (-10 points)

While nothing is inherently wrong with versions of 0.0.*, it might mean that the author is still experimenting with the general direction of the API.

Dependencies

Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.7.0 <3.0.0
Dev dependencies
test ^1.14.2