Support VendorOption Tags

PARSER

SLD

FEATUREREQUEST

Description:

I’m creating text symbolizers which look like this:

{
    color: "#000",
    font: ["Arial"],
    fontStyle: "normal",
    fontWeight: "bold",
    haloColor: "#fff",
    haloWidth: 1,
    kind: "Text",
    label: "{{name}}",
    size: 12
}

My backend is a geoserver instance and I need to send along some VendorOption tags which will control label placement. I know that these tags are not technically part of the SLD spec.

<VendorOption name="spaceAround">-1</VendorOption>

Here are the tags from the geoserver docs which I’m referring to: https://docs.geoserver.org/stable/en/user/styling/sld/reference/labeling.html#overlapping-and-separating-labels-spacearound

Would it be possible to extend text symbolizers so you could pass custom tags through? I would be willing to contribute a PR for this if this is possible and would be merged. I’m open to whatever means the owners think would be best to support this, if at all.

Thanks!

[glenselle]

// simplified example of the parser class in `sld-parser`
class SldStyleParser {
  getTextSymbolizer() {
    return {
      label: '{{name}}'
    }
  }
}
// simplified example of the possible new parser class `geostyler-geoserver-sld-parser`
class GeoserverSldStyleParser extends SldStyleParser {
  getTextSymbolizer() {
    return {
      ...super.getTextSymbolizer(),
      vendorOptions: {
        spaceAround: -1
      }
    }
  }
}

// this obviously would be done internally...not a public API -- just an example
const parser = new GeoserverSldStyleParser()
parser.getTextSymbolizer()
// I don't know how we'd represent these vendor options in the resulting object
// but this is one way similar to the @jodygarnett example
// { label: '{{name}}', vendorOptions: { spaceAround: -1 } }

[glenselle]

I thought I’d update this thread because we created the parser just like we talked about here. We’re currently in the process of getting approval from some internal folks before it can be made public. When it gets approved I’ll post back here.