Method checkSES

engine/cssparser.js:188–212

    const checkToken = (a, b) => !this.escaping && this.stringState === StringState.None && a === b;

    const checkSES = c => {
      if (this.escaping) {
        return false;
      }

      if (c != '"' && c != '\'') {
        return false;
      }

      const state = c == '"' ? StringState.Double : StringState.Single;

      // start
      if (this.stringState == StringState.None) {
        this.stringState = state;
        return true;
      }

      // end
      if (this.stringState == state) {
        this.stringState = StringState.None;
        return true;
      }

      return false;
    };

    input = input.replace(/\/\*[\w\W]*?\*\//g, '');