"use strict";

const { NotEnoughInput, NoMatch } = require("../symbols");

module.exports = function* characterRange(instruction, state) {
	let { start, end } = instruction;

	// FIXME: Unicode only! Need to check if we can assume that strings are always unicode, even when the source data was interpreted as another string encoding
	let codepoint = state.currentInput.codePointAt(state.currentIndex);

	// FIXME: Find a way to do this generically without breaking the EndOfInput operation
	if (state.currentIndex === state.currentInput.length) {
		return NotEnoughInput;
	} else if (codepoint >= start && codepoint <= end) {
		// TODO: Should we return the codepoint in string form here? That will be unnecessary work in most cases where `wholeMatch` will be used
		state.currentIndex += 1;
		return;
	} else {
		return NoMatch;
	}
};