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Is there a Java equivalent of Python's "construct" library? I want to write "structs" like so:
message = Struct("message",
UBInt8("protocol"),
UBInt16("length"),
MetaField("data", lambda ctx: ctx["length"])
)
It doesn't have to specifically be a library with some sort of abstraction using the Java language. I mean, it could be a "portable" format, with an API for parsing the documents. I guess this could work out with XML, but it would be be a lot more ugly.
I realize I could just inter-operate with Python, but I don't want to do that.
I've looked a lot around and all I could find was Ragel (www.complang.org/ragel), that can also produce Java code.
It looked too complex for me so I've started some work to port Construct to Java.
I suspect it would be easier to make something like that in Scala, Groovy or JavaScript.
Construct on GitHub: https://github.com/MostAwesomeDude/construct
java construct: https://github.com/ZiglioNZ/construct
I've spent a couple of days on it, mostly looking for equivalents of python's expressive classes.
The most useful java classes I've found are: java.util.Scanner, java.util.Formatter and java.nio.ByteBuffer.
It's a big task so I want to focus on something small like creating simple parsers and formatters for ByteBuffers.
[Update]
I've ported enough code to parse and build some of the protocols that come with Python Construct, such as ethernet, arp and ipv4. Check it out at https://github.com/ZiglioNZ/construct
[Update: new Release]
Java Construct 1.1.2 is now available, see release notes.
You can use DataInput/DataOutput (and their implementations) to convert any set of values from/to a set of bytes. This doesn't give you an object where you can use names to access the individual fields, though - you would have to create such yourself.
It depends a bit on what you want to do - do you have a fixed data format to send/receive on wire, or does this vary from time to time?
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Ive been searching for a while and can't seem to find what im looking for. What I want to do is write a python script to report problems and enforce code standards in Java code. Everything I have found so far has been things to translate java into python or python into java and that isn't really what I want. Im looking for a python library that can parse a multi-thousand class project and present the source itself in python in such a way where I can write rules something like
every class must have class level javadoc
every class must have a #primaryContactName tag in class level javadoc
every class must have a #primaryContactEmail tag in class level javadoc
the authorized 3rd party library list is {1,2,3,4,5} are any libraries other than this
list used
all lists and maps fully type safe.
bla bla bla
I reallize that I can get a great deal of this info from javac with very little effort, and I may investigate using javac to make version work, but im looking to do something a bit more advanced where I can build in real analytics
I have done similar with XDoclet in the past, but that was primarily used to mantain metadata in the source code about what systems it was accessing and such, nothing really to this analytics level im looking for now.
Anyone come across a python library that would help out with this? I would consider other languages (java, c, etc) its simply in my current situation, python is easier to work with than anything else.
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Is there a open source java api that allows to compare two Abstract Syntax Trees of java source code?
I would like to see the differences between the two syntax trees, similar to how it is done in diff tools.
Yes, there are free implementations that output tree diffs:
GumTree (fast, multi language, integrates with git): https://github.com/GumTreeDiff/gumtree
ChangeDistiller (quite mature, built as a self contained library): https://bitbucket.org/sealuzh/tools-changedistiller/wiki/Home
CodingSpectator (AST diffing is hard-coded in the rest of the code): https://github.com/vazexqi/CodingSpectator/tree/codingtracker-ast-inference
Most diff tools compare lines, not syntax trees (see Wikipedia article for discussion).
There are some techical papers that talk about how to do syntax tree compares, e.g.,
Diff/TS: A Tool for Fine-Grained Structural Change Analysis
There are no APIs for computing tree differences available anywhere as far as I know. The problem is more complex than it first sounds, if you want to get a minimal diff. But the basic technique is to use some variation of Levenstein distance metrics.
We had to roll our own for our line of SmartDifferencers; fortunately, we have really good front ends for many langauges to produce accurate ASTs.
You end up with additional surprises, such as people that want to compare comments in spite of the fact that what you have are ASTs, wanting to compare broken files, to compare language dialects your grammar doesn't match, or codes that contain insertions of other languages, etc.. Do diff by lines doesn't have these issues, which is one reason line-diff is widespread and tree-diff is not.
I wonder if there is an ANTLR extension somewhere that can do this....
http://www.antlr.org/
http://openjdk.java.net/projects/compiler-grammar/antlrworks/Java.g
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Can anybody help me by suggesting the name of an converter which converts C# code to Java code. Actually, I have a tool which is written in C# code and I am trying to modify it. As I have no idea about C# and .NET framework, it seems difficult to me to convert the large code by my own. I found from some web information that there exist some tools which can convert C# to Java (may not be properly, however they can). Can anybody help me by suggesting some name of those tools.
Disclaimer: No tool is perfect.
However, if you still want to try then there are these converters available:
CS2J
JCLA : Convert Java-language code to C#
Grasshopper
CSharpJavaMerger
Tangible Software C# to Java Converter
Not a converter but a bridge between .NET and the JVM:
JNI4NetBridge
You are better off doing it by hand. I've used code conversion software before, and it just mucks everything up. Sure, it corrects a few syntax differences, but largely what you'll get is just a mess of code that doesn't compile right away anyway.
With a converter you'll have to do a lot of corrections anyway. Why not take the small amount of extra time it will take to convert it by hand and end up with better code?
Even if you don't know C#, it will be better to learn it and do the conversion by hand, as I said before you will have to do it anyway. C# and Java are not too different syntactically, but as #Marc pointed out above, there are certainly gaps in the language. Simple C# is easily translated to Java, of course having to use the Java BCL instead of the .NET, which certainly have their differences. As you get into more complicated C#, there are things that have no direct equivalent.
Keep in mind, that conversion projects can be extremely time-consuming and are extremely effective at swallowing money in a business environment.
A google search will yield you some commercial options, but I'm not going to post them here, simply because I'm against that sort of thing. There are some things you just can't automatically translate.
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Hoping that anybody here knows about a good one: I'm looking for a (free to use) C++ library with a class hierarchy and methods resembling the Java API, with at least the I/O & networking part if it, specifically HTTP handling.
I work mainly with C & Java, but for this particular project C++ is recommended, so I thought of adopting a good set of C++ libraries without facing a steep learning curve.
Thanks in advance for any recommendation.
Qt is IMHO very java like. I.e. they prefer Java-Style Iterators over the STL ones. Qt includes networking (examples) and much other stuff (like scripting via javascript)
Have you looked at the Boost libraries?
Boost.IOStreams provides a framework for defining streams, stream buffers and i/o filters.
Asio - Portable networking, including sockets, timers, hostname resolution and socket iostreams.
Many others....
The Boost libraries provide similar capabilities as compared to the Java API, but they very much 'look and feel' - appropriately - like a C++ library.
There is also the option of using something like POCO, which is slightly simpler than using something like Boost, while still being cross platform.
While the only time I used HTTP in Java was a long time ago, the interface for the POCO library looks fairly simple to use. It gives a example of basic FTP usage a something like this:
Poco::Net::FTPStreamFactory::registerFactory();
std::ofstream localFile(inputFile, std::ios_base::out | std::ios_base::binary);
Poco::URI uri(inputURL);
std::auto_ptr<std::istream> ptrFtpStream(Poco::Net::URIStreamOpener::defaultOpener().open(uri));
Poco::StreamCopier::copyStream(*ptrFtpStream.get(), localFile);
A C++ library that looked like a Java one would be a bad library, IMHO. The two languages are so very different that what is good design for one will almost inevitably be bad design for the other.
You can take a look at Mindroid, which is primarily oriented to embeddded programming:
Mindroid is an application framework (with focus on messaging and concurrency) that lets you create applications using a set of reusable components - just like Android. The name Mindroid has two different meanings. On one hand Mindroid is a minimal set of core Android classes and on the other hand these classes also form Android's mind (at least in my opinion).
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What is the single best pretty-printing library for Java? I mean a library for printing formatted output with indentation, break hints, etc., not a library for beautifying/re-formatting Java code itself. Ideally, the library would "play nice" with System.out.println and friends.
For an idea of what I'm looking for, see OCaml's Format module, particularly Format.fprintf.
[UPDATE] I am not looking for a console windowing library. A pretty-printing library allows you to define methods for formatting arbitrary values such that indentation is preserved and line breaks are chosen at sensible locations. Such libraries exist for Haskell, Standard ML, OCaml, F#, and Scheme. The XTC library provides some of this functionality in xtc.tree.Printer, but it is not nearly as flexible as the libraries in other languages.
Is it jpplib?
Since you talk about boxes, break hints and so on I assume you mean to build a text-based windowing application. So I guess that you are looking for something similar to Ncurses but in Java. Maybe charva could help you.
You may also try javacurses.
According to Dr. Dobb's Code Talk it is cute.
I would say its still easier using Xalan + Sax, like in this example.