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/**
* Match Chinese characters
*/
export const REGEXP_CHINESE = /[\u4E00-\u9FFF]/g
/**
* Match Japanese characters
*/
export const REGEXP_JAPANESE = /[\u3040-\u309F\u30A0-\u30FF]/g
/**
* Match Korean characters
*/
export const REGEXP_KOREAN = /[\uAC00-\uD7AF\u1100-\u11FF]/g
/**
* Match CJK punctuation
*/
export const REGEXP_CJK_PUNCTUATION = /[\u3000-\u303F\uFF00-\uFF60]/g
/**
* Options for readingTime
*/
interface ReadingTimeOptions {
/**
* Average words read per minute
*/
wordsPerMinute?: number | {
/**
* Average words read per minute for CJK
*/
cjk: number
/**
* Average words read per minute for latin, e.g. English
*/
latin: number
}
}
/**
* Result for readingTime
*/
interface ReadingTimeResult {
/**
* String literal for statistics
*/
readonly text: string
/**
* Number of characters
*/
readonly characters: number
/**
* Number of words
*/
readonly words: number
/**
* Estimated reading market
*/
readonly minutes: number
}
/**
* Count the number of characters, words, and reading time of a string
*
* @param {string} data - String literal for statistics
* @param {ReadingTimeOptions} options
* @returns {ReadingTimeResult} result
*/
export function readingTime(data: string, options?: ReadingTimeOptions): ReadingTimeResult {
const text = data.trim()
const cjkCharacters
= (text.match(REGEXP_CHINESE) || []).length
+ (text.match(REGEXP_JAPANESE) || []).length
+ (text.match(REGEXP_KOREAN) || []).length
+ (text.match(REGEXP_CJK_PUNCTUATION) || []).length
const latinCharacters
= text
.replace(REGEXP_CHINESE, '')
.replace(REGEXP_JAPANESE, '')
.replace(REGEXP_KOREAN, '')
.replace(REGEXP_CJK_PUNCTUATION, '')
const latinWords
= latinCharacters
.split(/\s+/)
.filter(Boolean)
.length
const wordsPerMinuteForCjk = isObject(options?.wordsPerMinute) ? options.wordsPerMinute?.cjk : options?.wordsPerMinute ?? 200
const wordsPerMinuteForLatin = isObject(options?.wordsPerMinute) ? options.wordsPerMinute?.latin : options?.wordsPerMinute ?? 300
const words = cjkCharacters + latinWords
const minutes = Math.ceil(cjkCharacters / wordsPerMinuteForCjk + latinWords / wordsPerMinuteForLatin)
return {
text,
characters: text.length,
words,
minutes,
}
}
Eif (import.meta.vitest) {
const { describe, test, expect } = import.meta.vitest
const english = 'Hello, world!'
const chinese = '你好，世界！'
const japanese = 'こんにちは世界！'
const korean = '안녕하세요，세상아！'
const content = [english, chinese, japanese, korean].join('\n')
describe('readingTime', () => {
test('english', () => {
const { characters, words, minutes } = readingTime(english)
expect(characters).toBe(13)
expect(words).toBe(2)
expect(minutes).toBe(1)
})
test('chinese', () => {
const { characters, words, minutes } = readingTime(chinese)
expect(characters).toBe(6)
expect(words).toBe(6)
expect(minutes).toBe(1)
})
test('japanese', () => {
const { characters, words, minutes } = readingTime(japanese)
expect(characters).toBe(8)
expect(words).toBe(8)
expect(minutes).toBe(1)
})
test('korean', () => {
const { characters, words, minutes } = readingTime(korean)
expect(characters).toBe(10)
expect(words).toBe(10)
expect(minutes).toBe(1)
})
test('wordsPerMinute', () => {
const { characters, words, minutes } = readingTime(content, {
wordsPerMinute: {
cjk: 2,
latin: 5,
},
})
expect(characters).toBe(40)
expect(words).toBe(26)
expect(minutes).toBe(13)
})
})
}
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