nashorn/README
author sundar
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- What is Nashorn?
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Nashorn is a runtime environment for programs written in ECMAScript 5.1
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that runs on top of JVM.
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- How to find out more about ECMAScript 5.1?
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The specification can be found at
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    http://www.ecma-international.org/publications/standards/Ecma-262.htm
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- How to checkout sources of Nashorn project?
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Nashorn project uses Mercurial source code control system. You can
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download Mercurial from http://mercurial.selenic.com/wiki/Download
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Information about the forest extension can be found at
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    http://mercurial.selenic.com/wiki/ForestExtension
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and downlaoded using
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    hg clone https://bitbucket.org/gxti/hgforest
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You can clone Nashorn Mercurial forest using this command:
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    hg fclone http://hg.openjdk.java.net/nashorn/jdk8 nashorn~jdk8
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To update your copy of the forest (fwith the latest code:
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    (cd nashorn~jdk8 ; hg fpull)
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Or just the nashorn subdirectory with
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    (cd nashorn~jdk8/nashorn ; hg pull -u)
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To learn about Mercurial in detail, please visit http://hgbook.red-bean.com.
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- How to build?
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To build Nashorn, you need to install JDK 8. You may use the Nashorn
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forest build (recommended) or down load from java.net.  You will need to
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set JAVA_HOME environmental variable to point to your JDK installation
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directory.
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    cd nashorn~jdk8/nashorn/make
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    ant clean; ant
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- How to run?
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Use the jjs script (see RELESE_README):
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    cd nashorn~jdk8/nashorn
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    sh bin/jjs <your .js file>
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Nashorn supports javax.script API. It is possible to drop nashorn.jar in
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class path and request for "nashorn" script engine from
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javax.script.ScriptEngineManager. 
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Look for samples under the directory test/src/jdk/nashorn/api/scripting/.
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- Documentation
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Comprehensive development documentation is found in the Nashorn JavaDoc. You can
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build it using:
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    cd nashorn~jdk8/nashorn/make
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    ant javadoc
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after which you can view the generated documentation at dist/javadoc/index.html.
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- Running tests
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Nashorn tests are TestNG based. Running tests requires downloading the
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TestNG library and placing its jar file into the lib subdirectory:
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    # download and install TestNG
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    wget http://testng.org/testng-x.y.z.zip
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    unzip testng-x.y.z.zip
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    cp testng-x.y.z/testng-x.y.z.jar test/lib/testng.jar
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After that, you can run the tests using:
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    cd make
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    ant clean test
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You can also run the ECMA-262 test suite with Nashorn. In order to do
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that, you will need to get a copy of it and put it in
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test/script/external/test262 directory. A convenient way to do it is:
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   git clone https://github.com/tc39/test262 test/script/external/test262
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Alternatively, you can check it out elsewhere and make
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test/script/external/test262 a symbolic link to that directory. After
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you've done this, you can run the ECMA-262 tests using:
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    cd nashorn~jdk8/nashorn/make
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    ant test262
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Ant target to get/update external test suites:
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    ant externals
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    ant update-externals
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These tests take time, so we have a parallelized runner for them that
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takes advantage of all processor cores on the computer:
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    cd nashorn~jdk8/nashorn/make
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    ant test262parallel
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- How to write your own test?
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Nashorn uses it's own simple test framework. Any .js file dropped under
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nashorn/test directory is considered as a test. A test file can
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optionally have .js.EXPECTED (foo.js.EXPECTED for foo.js) associated
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with it. The .EXPECTED file, if exists, should contain the output
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expected from compiling and/or running the test file.
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The test runner crawls these directories for .js files and looks for
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JTReg-style @foo comments to identify tests.
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    * @test - A test is tagged with @test.
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    * @test/fail - Tests that are supposed to fail (compiling, see @run/fail
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      for runtime) are tagged with @test/fail.
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    * @test/compile-error - Test expects compilation to fail, compares
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      output.
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    * @test/warning - Test expects compiler warnings, compares output.
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    * @test/nocompare - Test expects to compile [and/or run?]
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      successfully(may be warnings), does not compare output.
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    * @subtest - denotes necessary file for a main test file; itself is not
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      a test.
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    * @run - A test that should be run is also tagged with @run (otherwise
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      the test runner only compiles the test).
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    * @run/fail - A test that should compile but fail with a runtime error.
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    * @run/ignore-std-error - script may produce output on stderr, ignore
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      this output.
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    * @argument - pass an argument to script.
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    * @option \ - pass option to engine, sample.
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/**
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 * @option --dump-ir-graph
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 * @test
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 */