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How to Modify the Eclipse Java Compiler/Grammar java.g. has any introducts the grammar of .g file? [message #662821]

Fri, 01 April 2011 06:08

liaobo

Messages: 1
Registered: April 2011

Junior Member

How to Modify the Eclipse Java Compiler/Grammar java.g.
l don't know the means of tag in the .g file,
such as the means of "->" in "Literal -> BooleanLiteral"?
and the means of '$empty',and so on .
has any introduct the grammar of .g file?

[Updated on: Fri, 01 April 2011 09:20]

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Re: How to Modify the Eclipse Java Compiler/Grammar java.g. has any introducts the grammar of .g f [message #664576 is a reply to message #662821]

Mon, 11 April 2011 09:24

Srikanth Sankaran

Messages: 5
Registered: July 2009

Junior Member

You need to be aware of the concept of and the
typical syntax used for context free grammars.
Literal -> BooleanLiteral means that one way to
compose/derive a Literal is to have composed/derived
a BooleanLiteral which itself is a non terminal defined
in terms of the terminal symbols true and false.
$empty means precisely that, i.e the non terminal
can be composed of empty input. e,g
ClassHeaderExtendsopt ::= $empty
means a class header's extends clause may be empty.

Any good compiler text would explain the terms
context free grammar, non terminals, terminals,
products, derivations etc.

You will also need the information from:
http://www.eclipse.org/jdt/core/howto/generate%20parser/gene rateParser.html

The source forge project for Jikes parser generator
may have some useful information for you also.

This could also be useful: http://jikes.sourceforge.net/documents/

Unfortunately I don't know of a single resource that
will answer all your questions regarding the syntax
of this file, You will have to piece together from the
variety of sources I mentioned.

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