parse xml and put data into bash array

Question

I have the following xml. I would like to loop through each node and push the <url>

value into a bash array if <extern> == 1. Any idea how I should approach this?

<GraphXML>
      <graph isDirected="true">
        <node name="0">
          <label>font</label>
          <url>http://fonts.googleapis.com/css?</url>
          <data>
            <checktime>0.262211</checktime>
            <extern>1</extern>
          </data>
        </node>
        <node name="1">
          <label>logo</label>
          <url>http://example.com/example.png</url>
          <data>
            <dlsize>7545</dlsize>
            <checktime>0.280600</checktime>
            <extern>0</extern>
          </data>
        </node>
     </graph>
    </GraphXML>

perreal · Accepted Answer · 2012-12-21 05:11:05Z

2

Using xmllint:

out=$(echo "cat /GraphXML/graph/node/url|/GraphXML/graph/node/data/extern" | \
        xmllint --shell input | sed 's/<[^>]*>//g;s/[-][-]*//g;s/\/[^>]*>//')
set $out
i=0
while [ $#  -gt 0 ] ; do
  url=$1
  shift
  extern=$1
  shift
  if [ $extern -eq 1 ]; then
    array[$i]=$url
    let i++
  fi  
done

echo ${array[*]}

edited Dec 21, 2012 at 5:11

answered Dec 21, 2012 at 4:56

perreal

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Comments

koola · Accepted Answer · 2012-12-21 07:42:29Z

Using bash

#!/bin/bash
declare -a ARR
while read -r line; do
    if [[ "$line" =~ ^\<(url|extern)\>(.*)\</[^\>]*\>$ ]]; then
        if [ "${BASH_REMATCH[1]}" == "extern" ]; then
            (( ${BASH_REMATCH[2]} == 0 )) && unset ARR[${#ARR[@]}-1]
        else
            ARR+=("${BASH_REMATCH[2]}")
        fi
    fi
done < <(grep -oE '<(url|extern)>.*</(url|extern)>' file.xml)

echo "${ARR[@]}"

Explanation

grep -oE - Uses extended regex -E to match either url or extern and return match -o
done < <( - Uses Process Substitution to feed grep into while loop.
while read -r line - Reads a line until EOF then while exits.
^\<(url|extern)\>(.*)\</[^\>]*\>$ - Matches line and saves into BASH_REMATCH array.
unset ARR[${#ARR[@]}-1] - Removes last element in array if extern attribute value is 0.
ARR+=(...) - Short form to add new element to array.

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