I had a need for something exactly like this...long story but it had to do
with javacc :)
Anyway, my open source project Keros (url is in my sig line) has a lot of
this type of functionality...
I am enclosing my macrodef to compute a branch:
<macrodef
name = "compute-branch"
description = "Compute the branch based upon a root dir, @{root},
and full path, @{full-path}. The branch represents the full path minus
the root dir. Please note: if @{root} does not exist in @{full-path},
@{property} will be set with an empty value."
uri = "http://keros.sourceforge.net";>
<attribute name = "root" description = "The root of the
path defined in @{full-path}."/>
<attribute name = "full-path" description = "The absolute path
for which @{root} is the root of the path and the branch computed is this
path minus the root."/>
<attribute name = "property" description = "The property to
set with the branch."/>
<attribute name = "description" default = "" description =
"Information about this macro call."/>
<sequential>
<!--
Grab data past @{root} in @{full-path}.
-->
<ant-contrib:propertyregex property =
"keros.compute-branch.COMPUTE_BRANCH" override = "true" input =
"@{full-path}" regexp = "@{root}(.*)" select = "\1" description =
"Parse out the branch from the value contained in @{root}"/>
<!--
Remove the leading file separator (if it is there). If it
is not there,
simply use the value as is.
-->
<ant-contrib:propertyregex property = "@{property}" override
= "true" input = "${keros.compute-branch.COMPUTE_BRANCH}" regexp =
"^[${file.separator}](.*)" replace = "\1" defaultValue =
"${keros.compute-branch.COMPUTE_BRANCH}" description = "Remove the
leading file separator if its there"/>
</sequential>
</macrodef>
I am using Ant Contrib's propertyregex task to do this... Adjust URI's,
etc for your needs :)
Let me know if you have any questions...
HTH,
Flossy
On Fri, 16 Jan 2009, Georg-Johann Lay wrote:
Hi,
can anyone assist me in solving this following quite trivial problem?
Given a path A and the current directory B=. derermine B relative to A.
This is needed for prefixes in zipfileset.
In the special case that I am after B is a subdirectory (of some level)
of A. So gettig the relative path B-A means that A and B look like this:
A=<sting1>
B=<sting1><string2>
I wasted hours to figure out how this could be achieved... The regex
stuff is too complicated because dirs may contain special chars like
blanke, ., \, /, -, $ and even *.
How can I easily remove the prexix A from B? I bet it is a one-liner.
Are there low level string utilities like getting substrings, prefixes, etc?
Thanks in advance,
Georg-Johann
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Scot P. Floess
27 Lake Royale
Louisburg, NC 27549
252-478-8087 (Home)
919-754-4592 (Work)
Chief Architect JPlate http://sourceforge.net/projects/jplate
Chief Architect JavaPIM http://sourceforge.net/projects/javapim
Architect Keros http://sourceforge.net/projects/keros
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