1978 - Percentage Parser

1978 - Percentage Parser

by SSShuai1999 (@SSShuai1999) #中等 #template-literal

题目

实现类型 PercentageParser<T extends string>。根据规则 /^(\+|\-)?(\d*)?(\%)?$/ 匹配类型 T。

匹配的结果由三部分组成，分别是：[正负号, 数字, 单位]，如果没有匹配，则默认是空字符串。

例如：

type PString1 = ''
type PString2 = '+85%'
type PString3 = '-85%'
type PString4 = '85%'
type PString5 = '85'

type R1 = PercentageParser<PString1> // expected ['', '', '']
type R2 = PercentageParser<PString2> // expected ["+", "85", "%"]
type R3 = PercentageParser<PString3> // expected ["-", "85", "%"]
type R4 = PercentageParser<PString4> // expected ["", "85", "%"]
type R5 = PercentageParser<PString5> // expected ["", "85", ""]

在 Github 上查看：https://tsch.js.org/1978/zh-CN

代码

/* _____________ 你的代码 _____________ */

type PercentageParser<A extends string> =
  A extends `${infer F extends '+' | '-'}${infer S}%`
    ? [F, S, '%']
    : A extends `${infer F extends '+' | '-'}${infer S}`
      ? [F, S, '']
      : A extends `${infer S}%`
        ? ['', S, '%']
        : ['', A, '']

测试用例

/* _____________ 测试用例 _____________ */
import type { Equal, Expect } from '@type-challenges/utils'

type Case0 = ['', '', '']
type Case1 = ['+', '', '']
type Case2 = ['+', '1', '']
type Case3 = ['+', '100', '']
type Case4 = ['+', '100', '%']
type Case5 = ['', '100', '%']
type Case6 = ['-', '100', '%']
type Case7 = ['-', '100', '']
type Case8 = ['-', '1', '']
type Case9 = ['', '', '%']
type Case10 = ['', '1', '']
type Case11 = ['', '100', '']

type cases = [
  Expect<Equal<PercentageParser<''>, Case0>>,
  Expect<Equal<PercentageParser<'+'>, Case1>>,
  Expect<Equal<PercentageParser<'+1'>, Case2>>,
  Expect<Equal<PercentageParser<'+100'>, Case3>>,
  Expect<Equal<PercentageParser<'+100%'>, Case4>>,
  Expect<Equal<PercentageParser<'100%'>, Case5>>,
  Expect<Equal<PercentageParser<'-100%'>, Case6>>,
  Expect<Equal<PercentageParser<'-100'>, Case7>>,
  Expect<Equal<PercentageParser<'-1'>, Case8>>,
  Expect<Equal<PercentageParser<'%'>, Case9>>,
  Expect<Equal<PercentageParser<'1'>, Case10>>,
  Expect<Equal<PercentageParser<'100'>, Case11>>,
]

相关链接

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