Need a standard Velocity class for doing macro preprocessing for various files
(XML, HTML, scripts, source files..)
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Key: VELOCITY-442
URL: http://issues.apache.org/jira/browse/VELOCITY-442
Project: Velocity
Type: Sub-task
Components: Build
Versions: 1.4
Environment: WindowsXP
Reporter: Colbert Philippe
Need to have standard class to do macro preprocessing of various files, source
code..etc.
Hi! I raised this issue before but I think I did not express myself correctly.
I was misunderstood. So I am attempting a second time. I am rephrasing my
thoughts here.
As you know, there are many files that use Velocity type, macro preprocessing.
To name a few: HTML, XML, programming language source-code...etc. With the
use of XML as configuration file, I find that having a standard macro
preprocessor like Velocity would be most useful.
When a user does preprocessing, he/she often has a library of macros (Velocity
*.vm files). These macros can be located in different file directories. This
is a very useful and powerful feature for the user. It avoids time-wasting,
repetitive typing.
My suggestion is that Velocity provides a single and standard class for doing
macro preprocessing. The class will be callable from the command-line. It
should be easy to implement. The class will take a list of directory
locations where it can find macros that are being called. Furthermore, it
will have two parameters for source and destination directory locations. The
source directory is the location of source files. The destination directory
will be the destination of the result file. The source and destination
directories can be the same.
I suggest using the following convention: The standard class will transform
any file that end with given suffix(es). For instance; every file that ends
with suffix *.velocity or *.vm will be processed and transformed to a file
with its suffix only.
MyFile.html.velocity >>> MyFile.html
MyFile.xml.vm >>> MyFile.xml
MyFile.python.velocity >>> MyFile.python
The important thing here is that the suffixes that are searched for should also
be a parameter as to allow full freedom for the user. In other words, the
user can specify suffixes *.macro or *.textmacro instead of *.velocity or/and
*.vm.
This simple standard class will go a long way to make Velocity more standard
and generally usable. Velocity will not only be a powerful Java library, it
will also be a powerful text processor. Many programmers and users will be
encouraged to use it because it is standard and for general purpose. This
standard class should be readily available in the Velocity jar file without any
Java programming.
As an extension to this standard Velocity class, you can have an ANT task that
will do the exact same thing for those who like to use ANT.
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