human
Complete the below
def gerrit(registry, xml_parent, data):

    ''''yaml: gerrit
    Trigger on a Gerrit event.
    Requires the Jenkins :jenkins-wiki:`Gerrit Trigger Plugin <Gerrit+Trigger>`
    version >= 2.6.0.
    :arg list trigger-on: Events to react on. Please use either the new
    **trigger-on**, or the old **trigger-on-*** events definitions. You
    cannot use both at once.
    .. _trigger_on:
    :Trigger on:
    * **patchset-created-event** (`dict`) -- Trigger upon patchset
    creation.
    :Patchset created:
    * **exclude-drafts** (`bool`) -- exclude drafts (default false)
    * **exclude-trivial-rebase** (`bool`) -- exclude trivial rebase
    (default false)
    * **exclude-no-code-change** (`bool`) -- exclude no code change
    (default false)
    Exclude drafts|trivial-rebase|no-code-change needs
    Gerrit Trigger v2.12.0
    * **patchset-uploaded-event** -- Trigger upon patchset creation
    (this is a alias for `patchset-created-event`).
    .. deprecated:: 1.1.0  Please use :ref:`trigger-on <trigger_on>`.
    * **change-abandoned-event** -- Trigger on patchset abandoned.
    Requires Gerrit Trigger Plugin version >= 2.8.0.
    * **change-merged-event** -- Trigger on change merged
    * **change-restored-event** -- Trigger on change restored. Requires
    Gerrit Trigger Plugin version >= 2.8.0
    * **draft-published-event** -- Trigger on draft published event.
    * **ref-updated-event** -- Trigger on ref-updated.
    * **comment-added-event** (`dict`) -- Trigger on comment added.
    :Comment added:
    * **approval-category** (`str`) -- Approval (verdict) category
    (for example \'APRV\', \'CRVW\', \'VRIF\' -- see `Gerrit access
    control
    <http://gerrit.googlecode.com/svn/documentation/2.1/
    access-control.html#categories>`_
    * **approval-value** -- Approval value for the comment added.
    * **comment-added-contains-event** (`dict`) -- Trigger on comment
    added contains Regular Expression.
    :Comment added contains:
    * **comment-contains-value** (`str`) -- Comment contains
    Regular Expression value.
    :arg bool...'''
assistant
#Here is the Python program you requested.
    def get_compare_type(xml_tag, compare_type):
        valid_compare_types = ['PLAIN', 'ANT', 'REG_EXP']
        if (compare_type not in valid_compare_types):
            raise InvalidAttributeError(xml_tag, compare_type, valid_compare_types)
        return compare_type
    gerrit_handle_legacy_configuration(data)
    projects = data.get('projects', [])
    gtrig = XML.SubElement(xml_parent, 'com.sonyericsson.hudson.plugins.gerrit.trigger.hudsontrigger.GerritTrigger')
    XML.SubElement(gtrig, 'spec')
    gprojects = XML.SubElement(gtrig, 'gerritProjects')
    for project in projects:
        gproj = XML.SubElement(gprojects, 'com.sonyericsson.hudson.plugins.gerrit.trigger.hudsontrigger.data.GerritProject')
        XML.SubElement(gproj, 'compareType').text = get_compare_type('project-compare-type', project.get('project-compare-type', 'PLAIN'))
        XML.SubElement(gproj, 'pattern').text = project['project-pattern']
        branches = XML.SubElement(gproj, 'branches')
        project_branches = project.get('branches', [])
        if (('branch-compare-type' in project) and ('branch-pattern' in project)):
            warning = 'branch-compare-type    and    branch-pattern    at    project    level    are    deprecated    and    support    will    be    removed    in    a    later    version    of    Jenkins    Job    Builder;    '
            if project_branches:
                warning += 'discarding    values    and    using    values    from    branches    section'
            else:
                warning += 'please    use    branches    section    instead'
            logger.warning(warning)
        if (not project_branches):
            project_branches = [{'branch-compare-type': project.get('branch-compare-type', 'PLAIN'), 'branch-pattern': project['branch-pattern']}]
        for branch in project_branches:
            gbranch = XML.SubElement(branches, 'com.sonyericsson.hudson.plugins.gerrit.trigger.hudsontrigger.data.Branch')
            XML.SubElement(gbranch, 'compareType').text =...