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Ruby library to parse and query C++ header files using GCCXML

tag: 0.1

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README
== What is rbgccxml?

RbGCCXML allows one to easily parse out and query C++ code. This library uses GCC-XML to parse out 
the C++ code into XML, and then Hpricot to parse and query that XML.

GCC-XML (http://www.gccxml.org) is an application that takes takes the parse tree of G++ and 
constructs a very parsable and queryable XML file with all related information. GCC-XML currently 
only works with code declarations; there currently are no plans to support code bodies.

Note: For those familiary with pygccxml, the similarities are minimal. Outside of the purpose
of both libraries, rbgccxml was built from scratch to provide a Ruby-esque query API instead of
being a port. However, many thanks to Roman for his work, without which this library would also
not exist.

== Requirements

* hpricot
* gccxml_gem (binary gem, choose proper platform)

== Installation

  gem install rbgccxml

RbGCCXML will work on all platforms that GCC-XML supports, which is currently all the major platforms
of Linux, Mac and Windows. If you're on a platform for which there isn't a current gccxml_gem build, 
please open a ticket on this project's tracker.
 
== The Project

For bug reports, patch submissions, project annoucements and downloads, visit RbGCCXML's rubyforge
project page at:

  http://www.rubyforge.org/projects/rbplusplus

Feel free to post help request, hints, or general ideas on the forums.

RbGCCXML's source is in a git repository hosted on github:

Project page: 

  http://github.com/jameskilton/rbgccxml/tree/master

Clone with: 

  git clone git://github.com/jameskilton/rbgccxml.git

== Usage

=== Parsing

The entry point of an RbGCCXML project is as follows:

  # Parse a single header file
  RbGCCXML.parse("/path/to/header/file.h")

  # Parse out all files that match a given glob
  RbGCCXML.parse("/my/headers/**/*.h")

  # Parse out a specified set of files"
  RbGCCXML.parse(["/path/to/file1.h", "/path/to/file2.h", ...])

  # Parse out multiple globs
  RbGCCXML.parse(["/my/headers/**/*.h", "/other/headers/*.hpp"])

=== Configuration

As GCC-XML runs on top of GCC, it will need to know about locations of other header files
that may be included by the header files being parsed out. Adding these directories is very easy.

  RbGCCXML.parse(..., :includes => *directories)

+directories+ can be a single directory string or an array of directories, just like RbGCCXML.parse.

=== Querying By Name

Once the header files have been parsed, RbGCCXML.parse returns a Namespace node that references the 
global namespace of "::". From here, all the function, class, etc declarations are easily queryable.

  source = RbGCCXML.parse("header.h")  #=> <Namespace ...>

Each major C++ part (class, struct, function, method (class functions), argument (of functions, methods, and constructors) have a related query method that can be called in one of two ways:

  # Grab all the classes and search from there
  source.classes.find(...)

  # Or just get a class of a given name, or that matches a regex. These calls are the same as
  # source.classes.find(:name => ...)

  # Find all classes with the name "ClassName"
  source.classes("ClassName")  

  # Find all classes that match ...Manager
  source.classes(/Manager$/)

For finding all classes in a namespace:

  source.classes

Or finding all namespaces:

  source.namespaces 

These queries are also infinitely nestable. To find the class "Math" inside the namespace 
"core::utils", you can do:

  source.namespaces("core").namespaces("utils").classes("Math")

RbGCCXML will eventually allow automatic jumping through layers, so namespaces("core::utils") would 
work, but for now the library only supports the long-hand form above.

=== Querying with #find

Of course, querying for names is only the tip of the powerful querying that RbGCCXML supports.

What if you wanted to find all methods on a class that return an int value and have three arguments?
This is easy with RbGCCXML:

  source.classes("yourclass").methods.find(:returns => :int, :arguments => [nil, nil, nil])

The keys +returns+ and +arguments+ can be used on their own, or at the same time as seen above. 
The +arguments+ option must be an array, and if the type of the argument doesn't matter, placing
'nil' in it's place acts as a wildcard. QueryResult.find is also chainable, provided that there
are always more than one result. Otherwise, if there is just one result, only that Node will
be returned and any further chained QueryResult.find methods will fail with "NoMethodError".

For full details on using this method, please see it's documentation at QueryResult.find.

=== The Next Step

To learn more about RbGCCXML, please start looking through the Node class; most of the query
API starts there, and following with that head to QueryResult.

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