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This simple expression constructor will be used for symbolizer properties and the layer will generate symbolizer literals for rendering by evaluating any expressions with a feature as the this argument and feature attributes as the scope. This allows generating labels that concatenate multiple attribute values together or displaying point symbols that are sized according to a population attribute divided by an area attribute, for example. This implementation will not work in environments where the content security policy disallows the use of the Function constructor. This is the case on browser extensions. A more content-security-policy-friendly implementation would be to come up with a restricted grammar and write a lex/parser. This is the road I started down, but this verison is far less code, and I think the security policy limitations are minor at this point. This version will always be faster/lighter than a parser, so one is written in the future, it should only be pulled in where content security policy mandates it.
OpenLayers 3
Hosted Examples
The examples are hosted on GitHub (as GitHub pages). See http://openlayers.github.com/ol3/master/examples/.
Build OpenLayers 3
Run build.py:
$ ./build.py
Windows users should run build instead.
Run examples locally
Run the Plovr web server with:
$ ./build.py serve
Windows users should run build serve instead.
Then, either open one of the example html files from the examples directory directly in your browser, or start a simple webserver, for example:
$ python -mSimpleHTTPServer
and explore the examples/ directory, for example by opening
http://localhost:8000/examples/side-by-side.html.
You can turn off compilation by appending ?mode=RAW to the URL, for example
http://localhost:8000/examples/side-by-side.html?mode=RAW.
Run tests
Run the plovr web server (see above), and either open the test/ol.html file
in the browser (e.g. http://localhost:8000/test/ol.html), or run ./build.py test
on the console (headless testing with PhantomJS, make sure to install it first from http://phantomjs.org/download.html).
See also the test-specific readme.
Run the linter
First, install the Closure Linter. Then:
$ ./build.py lint
Run the precommit hook before pushing a commit:
$ ./build.py precommit
Add examples
The examples are located in the examples directory. Adding a new example
implies creating two files in this directory, a .html file and .js file.
See examples/full-screen.html and examples/full-screen.js for instance.
The .html file needs to include a script tag with
loader.js?id=<example_name> as its src. For example, if the two files for
the examples are myexample.js and myexample.html then id should be set to
myexample in the loader.js URL.
build.py serve should be stopped and restarted for the
loader.js?id=<example_name> script tag to refer to a valid URL. build.py serve
triggers the examples target which creates Plovr JSON file for each example.