n8n/packages/nodes-base/nodes/Html/utils.ts

import type { IDataObject } from 'n8n-workflow';
import type { IValueData, Cheerio } from './types';

/**
 * @TECH_DEBT Explore replacing with handlebars
 */
export function getResolvables(html: string) {
	if (!html) return [];

	const resolvables = [];
	const resolvableRegex = /({{[\s\S]*?}})/g;

	let match;

	while ((match = resolvableRegex.exec(html)) !== null) {
		if (match[1]) {
			resolvables.push(match[1]);
		}
	}

	return resolvables;
}

// The extraction functions
const extractFunctions: {
	[key: string]: ($: Cheerio, valueData: IValueData) => string | undefined;
} = {
	attribute: ($: Cheerio, valueData: IValueData): string | undefined =>
		$.attr(valueData.attribute!),
	// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
	html: ($: Cheerio, _valueData: IValueData): string | undefined => $.html() || undefined,
	text: ($: Cheerio, _valueData: IValueData): string | undefined => $.text(),
	value: ($: Cheerio, _valueData: IValueData): string | undefined => $.val(),
};

/**
 * Simple helper function which applies options
 */
export function getValue($: Cheerio, valueData: IValueData, options: IDataObject) {
	const value = extractFunctions[valueData.returnValue]($, valueData);
	if (options.trimValues === false || value === undefined) {
		return value;
	}

	return value.trim();
}