digest

we're going to add a new method to the list term. it's called "digest". it collects up bites into an array.

this language bites of "pasta" then "gang" then a number and emits them as an array. bear in mind, you need to type it all out. otherwise, it returns null. it's all or nothing.

TRANSLATED:

to get the digest, eat your way through. add each bite to an array. if any bite fails, give up.

class ListTerm extends Term {
	//...
	digest(text) {
		const bites = []
		for (const term of this.terms) {
			const [nextBite, nextTail] = term.eat(text)
			if (nextBite === null) {
				return null
			}
			bites.push(nextBite)
			text = nextTail
		}
		return bites
	}
}

then use it.

const listTerm = new ListTerm([
	new StringTerm("pasta"),
	new StringTerm("gang"),
	new NumberTerm(),
])

function translate(text) {
	return listTerm.digest(text)
}

back to the dream