gulp-px2rem-converter/src/findRoot.ts

Gulp plugin. Converts all properties in pixels to rem, also converts all media in pixels in em

const rootPattern:RegExp = /:root+[^}]+}/; // find :root{@any}
const htmlPattern:RegExp = /html+[^}]+}/; // find html{@any}
const fontSizePattern:RegExp = /font-size+[^;]+;/ // find font-size:@any;

let resultRoot:Array<string> = [];
let params:string = '16px';
let fzResult:Array<string> = [];
const getParams = (file:string, skipeRoot:boolean = false):string => {
	if(!skipeRoot){
		resultRoot = rootPattern.exec(file) || [];
		if (resultRoot.length) {
			fzResult = fontSizePattern.exec(resultRoot[0]) || [];
			if(fzResult.length){
				return params = fzResult[0].replace(';','').split(':')[1];
			} else {
				resultRoot = [];
				return getParams(file, true);
			}
		}
	}

	resultRoot = htmlPattern.exec(file) || [];
	if(resultRoot){
		fzResult = fontSizePattern.exec(resultRoot[0]) || [];
		if(fzResult.length){
			return params = fzResult[0].replace(';','').split(':')[1];
		} else {
			resultRoot = [];
			return '16px';
		}
	}

	return params;
}

const getRoot = () : string => resultRoot[0] || '';

module.exports = {
	getParams,
	getRoot
};