Improve 'xml-prune' — support xpath for text content matching

[Alex-302]

Problem

It is impossible to select an element that contains certain text.

Example:
Ads on https://pluto.tv/en/on-demand/movies/6111bbe29b91f300138dc5d9
Ad config is stored here in the .MPD file:
https://gist.githubusercontent.com/Alex-302/b8c23ece5fbe1c80deb4efa8af96c51d/raw/8592abecef9398c28033d093f8999c987e6d3499/pluto.mdp

In this case following element contain info about video ad:

Details

  <Period id="6481524028df58ef1148b225-1686214254109" duration="PT30.000S" start="PT5007.463S">
    <BaseURL>https://siloh-cf.pluto.tv/701_02_ad/creative/6481524028df58ef1148b225_ad/720p/20230608_040000/dash/</BaseURL>
    <AdaptationSet id="0" frameRate="15360/512" segmentAlignment="true" par="16:9" contentType="video" maxWidth="854" maxHeight="480">
      <ContentProtection schemeIdUri="urn:mpeg:dash:mp4protection:2011" value="cenc" cenc:default_KID="00000000-621f-2afe-7ab2-c868d5fd2e2f" />
      <ContentProtection schemeIdUri="urn:uuid:9a04f079-9840-4286-ab92-e65be0885f95" value="MSPR 2.0" xmlns:dashif="https://dashif.org/">
        <cenc:pssh>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</cenc:pssh>
        <mspr:pro>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</mspr:pro>
        <dashif:laurl>service-concierge.clusters.pluto.tv/v1/pr/alt</dashif:laurl>
      </ContentProtection>
      <ContentProtection schemeIdUri="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed" xmlns:dashif="https://dashif.org/">
        <cenc:pssh>AAAASnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAACoSEAAAAABiHyr+erLIaNX9Li4SEAAAAABiHyr+erLIaNX9Li9I49yVmwY=</cenc:pssh>
        <dashif:laurl>service-concierge.clusters.pluto.tv/v1/wv/alt</dashif:laurl>
      </ContentProtection>
      <InbandEventStream schemeIdUri="www.pluto.tv" value="999" />
      <SupplementalProperty schemeIdUri="urn:mpeg:dash:adaptation-set-switching:2016" value="1" />
      <Role schemeIdUri="urn:mpeg:dash:role:2011" value="main" />
      <Representation id="0" width="640" height="360" sar="1:1" mimeType="video/mp4" codecs="avc1.64001f" bandwidth="687943">
        <SegmentTemplate timescale="15360" startNumber="1" media="video/360p-600/$Number%05d$.m4s" initialization="video/360p-600/init.mp4" presentationTimeOffset="0">
          <SegmentTimeline>
            <S d="76800" r="5" t="0" />
          </SegmentTimeline>
        </SegmentTemplate>
      </Representation>
      <Representation id="1" width="854" height="480" sar="1:1" mimeType="video/mp4" codecs="avc1.64001f" bandwidth="1701984">
        <SegmentTemplate timescale="15360" startNumber="1" media="video/480p-1600/$Number%05d$.m4s" initialization="video/480p-1600/init.mp4" presentationTimeOffset="0">
          <SegmentTimeline>
            <S d="76800" r="5" t="0" />
          </SegmentTimeline>
        </SegmentTemplate>
      </Representation>
      <Representation id="2" width="426" height="240" sar="1:1" mimeType="video/mp4" codecs="avc1.64001f" bandwidth="351528">
        <SegmentTemplate timescale="15360" startNumber="1" media="video/240p-300/$Number%05d$.m4s" initialization="video/240p-300/init.mp4" presentationTimeOffset="0">
          <SegmentTimeline>
            <S d="76800" r="5" t="0" />
          </SegmentTimeline>
        </SegmentTemplate>
      </Representation>
      <Representation id="3" width="854" height="480" sar="1:1" mimeType="video/mp4" codecs="avc1.64001f" bandwidth="1095476">
        <SegmentTemplate timescale="15360" startNumber="1" media="video/480p-1000/$Number%05d$.m4s" initialization="video/480p-1000/init.mp4" presentationTimeOffset="0">
          <SegmentTimeline>
            <S d="76800" r="5" t="0" />
          </SegmentTimeline>
        </SegmentTemplate>
      </Representation>
    </AdaptationSet>
    <AdaptationSet id="2" segmentAlignment="true" label="Original" contentType="audio">
      <ContentProtection schemeIdUri="urn:mpeg:dash:mp4protection:2011" value="cenc" cenc:default_KID="00000000-621f-2afe-7ab2-c868d5fd2e2f" />
      <ContentProtection schemeIdUri="urn:uuid:9a04f079-9840-4286-ab92-e65be0885f95" value="MSPR 2.0" xmlns:dashif="https://dashif.org/">
        <cenc:pssh>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</cenc:pssh>
        <mspr:pro>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</mspr:pro>
        <dashif:laurl>service-concierge.clusters.pluto.tv/v1/pr/alt</dashif:laurl>
      </ContentProtection>
      <ContentProtection schemeIdUri="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed" xmlns:dashif="https://dashif.org/">
        <cenc:pssh>AAAASnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAACoSEAAAAABiHyr+erLIaNX9Li4SEAAAAABiHyr+erLIaNX9Li9I49yVmwY=</cenc:pssh>
        <dashif:laurl>service-concierge.clusters.pluto.tv/v1/wv/alt</dashif:laurl>
      </ContentProtection>
      <Representation id="5" audioSamplingRate="48000" mimeType="audio/mp4" codecs="mp4a.40.2" bandwidth="105819">
        <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2" />
        <SegmentTemplate timescale="48000" startNumber="1" media="audio/default/$Number%05d$.m4s" initialization="audio/default/init.mp4" presentationTimeOffset="0">
          <SegmentTimeline>
            <S d="240640" t="0" />
            <S d="239616" t="240640" />
            <S d="240640" t="480256" />
            <S d="239616" r="1" t="720896" />
            <S d="240640" t="1200128" />
          </SegmentTimeline>
        </SegmentTemplate>
      </Representation>
    </AdaptationSet>
  </Period>

and it may be matched by _ad/creative/.

Proposed solution

Add ability to match element, which contains a text, including using regexp (like :contains() in Extended CSS).

It is desirable to use a syntax simpler than XPatch //Period[contains(BaseURL, '_ad/creative/')], like in ExtCSS or better like/similar to $jsonprune of CoreLibs.

[Yuki2718]

uBO supports xpath and it turend out to be useful to address Prime video ads where start attribute, but not node itself, should be removed for correct timing.