Extensible HTML/XML generator, cross-platform templating language, Oracle utilities and various other tools
XIST provides an extensible HTML and XML generator. XIST is also a XML parser with a very simple and pythonesque tree API. Every XML element type corresponds to a Python class and these Python classes provide a conversion method to transform the XML tree (e.g. into HTML). XIST can be considered ‘object oriented XSLT’.
XIST also includes the following modules and packages:
ll.ul4c is compiler for a cross-platform templating language with similar capabilities to Django’s templating language. UL4 templates are compiled to an internal format, which makes it possible to implement template renderers in other languages and makes the template code “secure” (i.e. template code can’t open or delete files).
ll.ul4on provides functions for encoding and decoding a lightweight machine-readable text-based format for serializing the object types supported by UL4. It is extensible to allow encoding/decoding arbitrary instances (i.e. it is basically a reimplementation of pickle, but with string input/output instead of bytes and with an eye towards cross-plattform support).
ll.orasql provides utilities for working with cx_Oracle:
- It allows calling functions and procedures with keyword arguments.
- Query results will be put into Record objects, where database fields are accessible as object attributes.
- The Connection class provides methods for iterating through the database metadata.
- Importing the modules adds support for URLs with the scheme oracle to ll.url.
ll.make is an object oriented make replacement. Like make it allows you to specify dependencies between files and actions to be executed when files don’t exist or are out of date with respect to one of their sources. But unlike make you can do this in a object oriented way and targets are not only limited to files.
ll.color provides classes and functions for handling RGB color values. This includes the ability to convert between different color models (RGB, HSV, HLS) as well as to and from CSS format, and several functions for modifying and mixing colors.
ll.sisyphus provides classes for running Python scripts as cron jobs.
ll.url provides classes for parsing and constructing RFC 2396 compliant URLs.
ll.nightshade can be used to serve the output of PL/SQL functions/procedures with CherryPy.
ll.misc provides several small utility functions and classes.
ll.astyle can be used for colored terminal output (via ANSI escape sequences).
ll.daemon can be used on UNIX to fork a daemon process.
ll.xml_codec contains a complete codec for encoding and decoding XML.
Changes in 4.3 (released 11/02/2012)
Accessing non-existant variables in UL4 templates now no longer raises an exception but returns the special object Undefined. The same is true for accessing non-existant dictionary keys or list/string indexes that are out of range.
In a boolean context Undefined is treated as false and str(Undefined) returns the empty string.
Two new UL4 functions have been added: isundefined returns whether the argument is the Undefined object or not. isdefined has the inverted logic, i.e. it returns True if the argument is not the Undefined object.
The characters CR and LF are no longer allowed in UL4 string constants. Furthermore the escape sequence \e is no longer supported.
All AST nodes for loading constants have been merged into a single class Const.
ll.ul4on can now read and write datetime.timedelta and misc.monthdelta objects as well as the new Undefined object from UL4 (ll.ul4c.Undefined).
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