ant-contrib for loop and regex in ant scripting - regex

Question

I have a requirement using ant, that the target should extract the two parameters passed as comma separated in a long list of similar pair of parameters passed which are semicolon separated. Currently I am doing something like this:
<?xml version="1.0"?>
<project name="" basedir="." default="test" xmlns:ac="antlib:net.sf.antcontrib">
<target name="test" >
<echo message="Hey There I am using What's App" />
<ac:for list="asdfg,dasfdf;vxxexqxx,hyyypyly;dksfgsgdgf,abaifuacu" delimiter=";" param="val">
<ac:sequential>
<ac:propertyregex property="param1"
input="#{val}"
regexp="([^\.]*)\,.*"
select="\1"
casesensitive="true" />
<ac:propertyregex property="param2"
input="#{val}"
regexp=".*,([^\.]*)"
select="\1"
casesensitive="true" />
<echo message = "val = ${param1}"/>
<echo message = "value = ${param2}"/>
</ac:sequential>
</ac:for>
</target>
</project>
But I am getting the output as:
Buildfile: /tmp/Manish/build.xml
test:
[echo] Hey There I am using What's App
[echo] val = asdfg
[echo] value = dasfdf
[echo] val = asdfg
[echo] value = dasfdf
[echo] val = asdfg
[echo] value = dasfdf
So this is getting looped 3 times(correct) but by only the first value passed in the for loop parameter. Is there some obvious mistake I am making?
Thanks,
Manish Joshi

Answer 1

Try using foreach instead of for and put the propertyregex into a separate target. Here is an example from my ant script, it basically does the same thing.
<target name="loadTestStatic" depends="setTargetEnv,setPassword">
<loadfile property="controlFile" srcFile="${projectDir}/test/config/static/controlFile.txt"/>
<foreach list="${controlFile}" delimiter="${line.separator}" param="descriptor" target="loadConfig"/>
</target>
<target name="loadConfig">
<if>
<matches string="${descriptor}" pattern="^camTool:"/>
<then>
<propertyregex property="camToolFile"
input="${descriptor}"
regexp="camTool:(.*)"
select="\1"
casesensitive="false" />
<echo message="Got cam tool file ${camToolFile}"/>
<camTool file="${camToolFile}"/>
</then>
<else>
<!-- todo: add CM Tool, SQL as required -->
<echo message="Unexpected config ${descriptor} ignored"/>
</else>
</if>
</target>

Answer 2

An alternative approach is to use a scripting language like groovy.
<groovy>
<arg value="asdfg,dasfdf;vxxexqxx,hyyypyly;dksfgsgdgf,abaifuacu"/>
args[0].tokenize(";").each {
def m = it.tokenize(",")
println "val = ${m[0]}"
println "value = ${m[1]}"
}
</groovy>

Answer 3

Alternatively use Ant addon Flaka, f.e. :
<project xmlns:fl="antlib:it.haefelinger.flaka">
<!-- with cvs property -->
<property name="foobar" value="asdfg,dasfdf;vxxexqxx,hyyypyly;dksfgsgdgf,abaifuacu"/>
<fl:for var="item" in="split('${foobar}', ';')">
<fl:let>
param1 ::= split(item, ',')[0]
param2 ::= split(item, ',')[1]
</fl:let>
<echo>
$${param1} => ${param1}
$${param2} => ${param2}
</echo>
</fl:for>
<!-- with list inline -->
<fl:for var="item" in="split('asdfg,dasfdf;vxxexqxx,hyyypyly;dksfgsgdgf,abaifuacu', ';')">
<fl:let>
param1 ::= split(item, ',')[0]
param2 ::= split(item, ',')[1]
</fl:let>
<echo>
$${param1} => ${param1}
$${param2} => ${param2}
</echo>
</fl:for>
</project>
Notice the double '::' in param1 ::= split(item, ',')[0]
means overriding any (also userproperties, defined via -Dkey=value as commandline arguments) existing property
whereas ':=' creates a property but won't overwrite if property already exists.

Answer 4

<target name="myTarget">
<ac:propertyregex property="param1"
input="${myValue}"
regexp="([^\.]*)\,.*"
select="\1"
casesensitive="true" />
<ac:propertyregex property="param2"
input="${myValue}"
regexp=".*,([^\.]*)"
select="\1"
casesensitive="true" />
<echo message = "val = ${param1}"/>
<echo message = "value = ${param2}"/>
</target>
<ac:for list="asdfg,dasfdf;vxxexqxx,hyyypyly;dksfgsgdgf,abaifuacu" delimiter=";" param="val">
<ac:sequential>
<antcall target="myTarget">
<param name="myValue" value="#{val}" />
</antcall>
</ac:sequential>
</ac:for>

Answer 5

Properties in Ant are immutable. You will need to use the variable task from ant-contrib (although it is discouraged) to unset the properties:
<ac:for list="asdfg,dasfdf;vxxexqxx,hyyypyly;dksfgsgdgf,abaifuacu" delimiter=";" param="val">
<ac:sequential>
<ac:propertyregex property="param1"
input="#{val}"
regexp="([^\.]*)\,.*"
select="\1"
casesensitive="true" />
<ac:propertyregex property="param2"
input="#{val}"
regexp=".*,([^\.]*)"
select="\1"
casesensitive="true" />
<echo message = "val = ${param1}"/>
<echo message = "value = ${param2}"/>
<ac:var name="param1" unset="true"/>
<ac:var name="param2" unset="true"/>
</ac:sequential>
</ac:for>