HTMLTagFilter.php

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<?php
class HTMLTagFilter extends HTMLFormField {
    protected $tagFilter;

    public function getTableRow( $value ) {
        $this->tagFilter = ChangeTags::buildTagFilterSelector(
            $value, false, $this->mParent->getContext() );
        if ( $this->tagFilter ) {
            return parent::getTableRow( $value );
        }
        return '';
    }

    public function getDiv( $value ) {
        $this->tagFilter = ChangeTags::buildTagFilterSelector(
            $value, false, $this->mParent->getContext() );
        if ( $this->tagFilter ) {
            return parent::getDiv( $value );
        }
        return '';
    }

    public function getOOUI( $value ) {
        $this->tagFilter = ChangeTags::buildTagFilterSelector(
            $value, true, $this->mParent->getContext() );
        if ( $this->tagFilter ) {
            return parent::getOOUI( $value );
        }
        return new OOUI\FieldLayout( new OOUI\Widget() );
    }

    public function getInputHTML( $value ) {
        if ( $this->tagFilter ) {
            // we only need the select field, HTMLForm should handle the label
            return $this->tagFilter[1];
        }
        return '';
    }

    public function getInputOOUI( $value ) {
        if ( $this->tagFilter ) {
            // we only need the select field, HTMLForm should handle the label
            return $this->tagFilter[1];
        }
        return '';
    }
}