September 2010
Intermediate to advanced
592 pages
18h 30m
English
Content preview from Closure: The Definitive GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Appendix C. plovr
plovr is a build tool for projects that use Closure. (Its name is the
product of the animal on the cover of this book, the Web 2.0 zeitgeist, and
domain name availability.) It can be run either as a web server (like the
Closure Compiler Service introduced in Chapter 12), or as a command-line build script (like
calcdeps.py). The goal of plovr is to make development with
Closure easier and faster. By integrating the Closure Library, Templates,
and Compiler into a single application with a normalized set of input
options, it is considerably easier to get up and running with Closure from a
single download. Furthermore, because plovr can be run as a web server, it
can store information from previous compilations in memory, making
subsequent compilations faster.
When running plovr as a web server, it provides a number of services that can help with development:
Displays warnings and errors from the Compiler at the top of the web page that loads the compiled JavaScript with links to the line number where the warning or error occurred.
Automatically compiles Soy files (as indicated by files whose names end in
.soy) to JavaScript files.Provides a view that compares the size of the original code to that of the compiled code. This is done on a per-file basis so that it is possible to identify which input files are contributing the most code to the compiled output.
Generates an externs file from the calls to
goog.exportSymbol()andgoog.exportProperty()in the input.Generates ...
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