Hi,
I have just added support to OpenLayers to support the closure
compiler when building OpenLayers files. To take advantage of
this support on trunk, you must first place a closure-compiler.jar
file in your tools directory. From the build/README.txt file:
"""
* closure
This requires you to have a closure-compiler.jar in your
tools directory. You can do this by fetching the compiler
from:
http://closure-compiler.googlecode.com/files/compiler-latest.zip
Then unzipping that file, and placing compiler.jar into tools
and renaming it closure-compiler.jar.
"""
(This will also require you to have support for running java at the
command line.)
To use this compressor once you have downloaded it, you can run the
following build command:
python build.py -c closure full
For smaller builds (not full builds -- they're too big), you can use
the closure webservice by instead specifying closure_ws:
python build.py -c closure_ws lite
The output will be the same, but your code will be posted to the closure
web service as part of the build. (The size limit is 1MB.)
Closure is an advanced compiler provided by Google; it is Open Source
(under the Apache2 license) and offers significant savings over our
default jsmin compiler, lowering compressed build sizes by approximately
15%. The numbers:
Full Builds:
900504 OpenLayers-jsmin.js
719130 OpenLayers-closure.js (20% savings)
200584 OpenLayers-jsmin.js.gz
172663 OpenLayers-closure.js.gz (14% savings)
Lite Builds:
123091 OpenLayers-lite-jsmin.js
96678 OpenLayers-lite-closure.js (21% savings)
30977 OpenLayers-lite-jsmin.js.gz
26347 OpenLayers-lite-closure.js.gz (15% savings)
Using the closure compiler, all OpenLayers tests continue to pass,
and the examples that I have tested appear to continue to work. The live
examples at http://openlayers.org/dev/examples/ are now using
a closure-based build as well, so if you have any problems with these
examples, please report them to the mailing list.
As always, using minimal build profiles and gzipping javascript before
delivering it is the best way to minimize Javascript download size.
Thanks!
-- Chris
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