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HTML

              
                <textarea id=source placeholder="Crummy AI SVG here"></textarea>

<button onclick="convert()">Gradients to defs sans redundancies, plz!</button>

<textarea id=output placeholder="Output will be here..."></textarea>

<!-- 
USE BELOW AS EXAMPLE
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="800" height="600" viewBox="0 0 800 600">
  <defs></defs>
  <g>
    <linearGradient id="e" gradientUnits="userSpaceOnUse" x1="105.933" y1="168.139" x2="105.933" y2="364.116">
      <stop offset=".004" stop-color="#C49E89"/>
      <stop offset=".256" stop-color="#A77F56"/>
      <stop offset=".281" stop-color="#9F7952"/>
      <stop offset=".382" stop-color="#856445"/>
      <stop offset=".493" stop-color="#70533B"/>
      <stop offset=".618" stop-color="#614834"/>
      <stop offset=".766" stop-color="#594130"/>
      <stop offset="1" stop-color="#563F2F"/>
    </linearGradient>
    <path fill="url(#e)" d="M99.9 168.1l-5.2 193.7s11.5 5.7 22.5-.7l-4.2-193H99.9z"/>
  </g>
  <g>
    <linearGradient id="f" gradientUnits="userSpaceOnUse" x1="677.744" y1="174.154" x2="677.744" y2="370.131">
      <stop offset=".004" stop-color="#C49E89"/>
      <stop offset=".256" stop-color="#A77F56"/>
      <stop offset=".281" stop-color="#9F7952"/>
      <stop offset=".382" stop-color="#856445"/>
      <stop offset=".493" stop-color="#70533B"/>
      <stop offset=".618" stop-color="#614834"/>
      <stop offset=".766" stop-color="#594130"/>
      <stop offset="1" stop-color="#563F2F"/>
    </linearGradient>
    <path fill="url(#f)" d="M671.7 174.2l-5.2 193.7s11.5 5.7 22.5-.7l-4.1-192.9h-13.2z"/>
  </g>
  <g>
    <linearGradient id="g" gradientUnits="userSpaceOnUse" x1="742.187" y1="127.981" x2="742.187" y2="373.223">
      <stop offset=".004" stop-color="#C49E89"/>
      <stop offset=".256" stop-color="#A77F56"/>
      <stop offset=".281" stop-color="#9F7952"/>
      <stop offset=".382" stop-color="#856445"/>
      <stop offset=".493" stop-color="#70533B"/>
      <stop offset=".618" stop-color="#614834"/>
      <stop offset=".766" stop-color="#594130"/>
      <stop offset="1" stop-color="#563F2F"/>
    </linearGradient>
    <path fill="url(#g)" d="M734.6 128l-6.5 242.4s14.3 7.1 28.1-.9L751.1 128h-16.5z"/>
  </g>
</svg>

-->
              
            
!

CSS

              
                textarea, button {
  width: 90%;
  max-width: 700px;
  margin: 1em auto;
  display: block;
  box-sizing: border-box;
}
textarea {
  height: 300px;
  padding: 1em;
  white-space: pre;
  font-family: monospace;
}

button {
  padding: 1em 2em;
}

#content {
  display: none;
}
              
            
!

JS

              
                function convert() {
  // source content  
  var source = document.getElementById("source").value;
  // all gradients expression
  var gradientExp = /(<[a-zA-Z]+Gradient[\S\s]+?<\/[a-zA-Z]+Gradient>)/g;
  // finding all gradients  
  var gradientMatches = source.match(gradientExp);
  // gradients array to hold gradient objects for comparison
  var gradients = [];
  // if any gradients exist  
  if(gradientMatches) {
    // for each match
    for (var m = 0; m < gradientMatches.length;) {
      
      var gradient = gradientMatches[m++],
          tag = gradient.match(/<[a-zA-Z]+Gradient[\S\s]+?>/)[0],
          type = tag.match(/[a-z]+Gradient/)[0],
          id = tag.match(/id=".*?"/)[0].replace(/id="(.*)?"/, "$1"),
          attrs = tag.match(/[a-zA-Z0-9-_]+=".+?"/g),
          stops = "  " + gradient.match(/<stop.*(\/>|<\/stop>)/g).join("\n  "); 
    
      // if we're past the first match
      if (m > 1) {
        // checking flag
        var checking = true;
        // see if stops match a previous stops
        for (var s = m - 1; s > 0; s--) {
          // if stops match previous stops
          if (stops == gradients[s - 1].stops && checking) {
            checking = false;
            // remove stops value
            stops = "";// "#" + gradients[s - 1].id;
            // add xlink attribute
            attrs.splice(1, 0, "xlink:href=\"#" + gradients[s - 1].id + "\"");
          };
        }
      }
      
      // add gradient to gradients
      gradients.push({
        type: type,
        id: id,
        attrs: attrs,
        stops: stops
      });
      
      // remove all gradients
      source = source.replace(gradient, "");
    }

    console.log(gradients);
    
    // defs
    var defs = "";
    // for each gradient
    for(var g = 0; g < gradients.length; g++) {
      var gradient = gradients[g];      
      defs += "\n<" + gradient.type + " " + gradient.attrs.join(" ");
      if (gradient.stops) {
        defs += ">\n" + gradient.stops + "\n</" + gradient.type + ">";
      } else {
        defs += " />";
      }
      defs += "\n";
    }
    
    if(source.indexOf("<defs>") > -1) {
      source = source.replace("<defs>", "<defs>\n"+defs);
    } else {
      source = source.replace(/(<svg.*?>)/g, "$1\n<defs>\n"+defs+"</defs>\n");
    }
    
  }
  document.getElementById("output").value = source;
}


              
            
!
999px

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