code: function checkUri1(i) {
    const start = i;
    let l;
  
    if (l = checkSC(i)) i += l;
  
    while (i < tokensLength) {
      if (l = checkInterpolation(i) || checkUriRaw(i)) i += l;
      else break;
    }
  
    if (l = checkSC(i)) i += l;
  
    // Check that we are at the end of the uri
    if (i < tokens[start - 1].right) return 0;
  
    tokens[start].uri_end = i;
  
    return i - start;
  }
docs: Check for a raw (without quotes) URI
  (1) http://foo.com/bar.png
  (2) http://foo.com/#{$bar}.png
  (3) #{$foo}/bar.png
  (4) #{$foo}
  @param {number} i Token's index number
  @return {number} Length of URI node