0.5.4 • Published 4 years ago
typescript-parser-combinator v0.5.4
TypeScript Parser Combinator
A simple parser combinator in TypeScript.
It has been built with the sole aim of learning parser combinators and npm package management.
Getting Started
Consider the following
import { text, digits, takeUntil, char, unit, space, word, newLineToken, between } from 'typescript-parser-combinator'
let input = "Weather (today): Sunny\r\n" +
"Weather (yesterday): Cloudy\r\n" +
"Weather (one week ago): Rainy"
let parser = text('Weather')
.then(space)
.then(between(text('('),text(')'))) .take()
.then(text(': ')) .drop()
.then(word)
.then(newLineToken.maybe()) .drop()
.map(([date, weather]) => ({ date, weather }))
.many1()
let result = parser(input)
if (result.success) {
expect(result.value[0].date).to.equal('today')
expect(result.value[0].weather).to.equal('Sunny')
expect(result.value[1].date).to.equal('yesterday')
expect(result.value[1].weather).to.equal('Cloudy')
expect(result.value[2].date).to.equal('one week ago')
expect(result.value[2].weather).to.equal('Rainy')
}
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