Monthly Archives: June 2009

Stitches of a flea language – defining Java annotations in Jython

Posted on 30. June 2009 by kay

Jython annotations – anyone? The last few days I tried to figure out how to create Jython annotations. A Jython annotation is defined here as a Java annotation lifted from Jython to Java. So one essentially defines a Java annotation … Continue reading →

Posted in Java, Jython | 9 Comments

Into The Labyrinth – using the JavaCompiler API from Jython

Posted on 23. June 2009 by kay

The Plumber After having neglected Java for years I began to re-examine it this month together with Jython and my initial reaction was a culture shock. Java is infamous for being a “plumbing language” i.e. you have to subclass some … Continue reading →

Posted in Java, Python | 1 Comment

Linear bounds for backtracking parsers with memoization

Posted on 12. June 2009 by kay

On the comp.compilers mailing list I asked for a confirmation of the O(n) complexity claim for packrat parsers. A packrat parser is a particular top down recursive descendant parser which applies backtracking on failure of consuming a token by application … Continue reading →

Posted in Parsing | 2 Comments

Is parsing Perl really impossible?

Posted on 12. June 2009 by kay

I just read this article about the apparent inability to parse Perl 5. There is an underlying assumption that a parser has to resolve all ambiguities and derive a single parse tree from an expression ( giving a unique interpretation … Continue reading →

Posted in Grammars, Parsing | 5 Comments

Jython – 64K ought to be enough for anybody

Posted on 10. June 2009 by kay

Jython 2.5rc4 (Release_2_5rc4:6470, Jun 8 2009, 13:23:16) [Java HotSpot(TM) Client VM (Sun Microsystems Inc.)] on java1.6.0_13 Type "help", "copyright", "credits" or "license" for more information. >>> L = range(10000) >>> eval(str(L)) Traceback (most recent call last): File "", line 1, … Continue reading →

Posted in General | 9 Comments

CodeTemplates – a fresh look on code transformations

Posted on 7. June 2009 by kay

This is the first part of a two part article series about CodeTemplates. CodeTemplates are a code transformation technique that suggests an alternative to common syntactic as well as lexical macros for whole language transformations. Syntactic macros About three years … Continue reading →

Posted in DSL, Grammars, TBP | Comments Off on CodeTemplates – a fresh look on code transformations

Singular irregularities

Posted on 6. June 2009 by kay

An irregularity is a shape or rule violation. It supposes that objects are built according to rules but there are exceptional cases that don’t really fit or do at least violate our expectations of the building law. An irregularity is … Continue reading →

Posted in General | 3 Comments