Improvement: merge text and tspan

[JoKalliauer]

I would like to merge simple <text> with <tspan>

Inputexample:

 <text x="313.88" y="322.89">
  <tspan x="313.88" y="322.89">1</tspan>
 </text>

Output:

 <text x="313.88" y="322.89">1</text>

actually I am using (case-depended) following scripts:

#tspan in tspan
sed -ri -e ':a' -e 'N' -e '$!ba' -e "s/<tspan([-[:alnum:]\,\.\"\=\:\ \#]*) x=\"([-[:digit:]\.\ ]+)\" y=\"([-[:digit:]\.\ ]+)\"([-[:alnum:]\,\.\"\=\:\ \#]*)>[[:space:]]*<tspan([-[:alnum:]\,\.\"\=\:\ \#]*) x=\"([-[:digit:]\.\ ]+)\" y=\"([-[:digit:]\.\ ]+)\"([-[:alnum:]\,\.\"\=\:\ \#]*)>([-[:alnum:]\.\ \,\(\)]*)<\/tspan>/<tspan x=\"\6\" y=\"\7\"\1\4\5\8>\9/g" $i

#tspan to text
sed -ri  -e ':a' -e 'N' -e '$!ba' -e "s/<text([-[:alnum:]\,\.\"\=\:\ \#\(\)]*)( x=\"[-[:digit:]\.\ ]+\" y=\"[-[:digit:]\.\ ]+\")/<text\2\1/g" $i # that x ist at the beginning (otherwise the next line would not work)
sed -ri  -e ':a' -e 'N' -e '$!ba' -e "s/<text( x=\"[-[:digit:]\.\ ]+\" y=\"[-[:digit:]\.\ ]+\"|)([-[:alnum:]\,\.\"\=\:\ \#\(\)\%\']*)>[[:space:]]*<tspan([-[:alnum:]\,\.\"\=\:\ \#\']*) x=\"([-[:digit:]\.\ ]+)\" y=\"([-[:digit:]\.\ ]+)\"([-[:alnum:]\,\.\"\=\:\ #]*)>([-–[:alnum:]\.\ \,\{\(\)\♭\♯\/]*)<\/tspan>/<text x=\"\4\" y=\"\5\"\2\3\6>\7/g" $i #removes the first tspan of a text element

#tspan to text if tspan has no coordinates
sed -ri  -e ':a' -e 'N' -e '$!ba' -e "s/<text([-[:alnum:]\,\.\"\=\:\ \#\(\)]*) x=\"([-[:digit:]\.\ ]+)\" y=\"([-[:digit:]\.\ ]+)\"([-[:alnum:]\,\.\"\=\:\ \#\(\)\%\']*)>[[:space:]]*<tspan([-[:alnum:]\,\.\"\=\:\ \#\'\%]*)>([-–[:alnum:]\.\ \,\{\(\)]*)<\/tspan>/<text x=\"\2\" y=\"\3\"\1\4\5>\6/g" $i

it works in most cases but they can be buggy.

If you are interested to implement it I can post some more general test-examples.
Already asked in RazrFalcon/svgcleaner#127 and svg/svgo#964 , but not implemented till now.