@fontoxml/fontoxml-development-tools/src/request/IsolatedOption.js

Development tools for Fonto.

import Option from './Option.js';
import symbols from './symbols.js';

export default class IsolatedOption extends Option {
	constructor(name) {
		super(name);
	}

	// By resetting all tiers there are no "unresolved" syntax parts
	[symbols.updateTiersAfterMatch](tiers) {
		tiers = {
			ordered: [],
			unordered: tiers.unordered.filter(
				(tier) => tier.isExemptFromIsolatedOption
			),
		};
		return tiers;
	}

	// By emptying out parts there should be no further attempts to match
	[symbols.spliceInputFromParts](parts, tiers) {
		const input = Option.prototype[symbols.spliceInputFromParts].apply(
			this,
			arguments
		);

		// Clear existing parts, keeping only the parts which are exempt from isolated option emptying.
		const exemptTiers = tiers.unordered.filter((tier) => tier.isExemptFromIsolatedOption);
		const exemptParts = parts.filter(
			(part) => exemptTiers.some((tier) => tier[symbols.isMatchForPart](part))
		);
		parts.length = 0;
		for (const part of exemptParts) {
			parts.push(part);
		}

		return input;
	}

	// By resetting the results to just the command and this instance the Request object stays clean
	[symbols.updateInputSpecsAfterMatch](resolvedInputSpecs, inputValue) {
		resolvedInputSpecs = [
			resolvedInputSpecs
				.reverse()
				.find((inputSpec) => inputSpec.syntax.getType() === 'command'),
			...resolvedInputSpecs.filter(inputSpec => inputSpec.syntax?.isExemptFromIsolatedOption),
			{
				syntax: this,
				input: inputValue,
			},
		];

		return resolvedInputSpecs;
	}
}