postcss-less/lib/tokenizer/find-end-of-escaping.js

LESS parser for PostCSS

import {backTick, backslash, doubleQuote, singleQuote} from './globals';

/**
 * @param state
 * @returns {number}
 */
export default function findEndOfEscaping (state) {
    let openQuotesCount = 0;
    let quoteCode = -1;

    for (let i = state.pos + 1; i < state.length; i++) {
        const symbolCode = state.css.charCodeAt(i);
        const prevSymbolCode = state.css.charCodeAt(i - 1);

        if (
            prevSymbolCode !== backslash &&
            (symbolCode === singleQuote || symbolCode === doubleQuote || symbolCode === backTick)
        ) {
            if (quoteCode === -1) {
                quoteCode = symbolCode;
                openQuotesCount++;
            } else if (symbolCode === quoteCode) {
                openQuotesCount--;

                if (!openQuotesCount) {
                    return i;
                }
            }
        }
    }

    return -1;
}