PyPop.xslt

Python XSLT extensions for handling things outside the scope of XSLT 1.0.

Attributes

ns	Function namespace for custom PyPop XSLT extension functions.

Functions

num_zeros(decimal)	Count zeroes.
exponent_len(num)	Calculate space taken for exponent.
format_number_fixed_width(_context, *args)	Format number to fixed width.

Package Contents

ns

Function namespace for custom PyPop XSLT extension functions.

This namespace allows registering Python functions that can be called directly from XSLT stylesheets.

prefix

The namespace prefix used in XSLT stylesheets. Here it is set to "es", so extension functions are invoked as es:format_number_fixed_width(...). See example in format_number_fixed_width()

Type:

str

num_zeros(decimal)

Count zeroes.

Parameters:

decimal (float) – number to check

Returns:

number of zeroes in floating point number, or inf if number is zero

Return type:

int

exponent_len(num)

Calculate space taken for exponent.

Example

>>> exponent_len(1e-03)
2
>>> exponent_len(1e-10)
3

Parameters:

num (float) – input number

Returns:

length of exponent

Return type:

int

format_number_fixed_width(_context, *args)

Format number to fixed width.

Example

>>> ns["format_number_fixed_width"] = format_number_fixed_width
>>> root = etree.XML("<a><b>0.0000043</b></a>")
>>> doc = etree.ElementTree(root)
>>> xslt = etree.XSLT(etree.XML('''
... <stylesheet version="1.0" xmlns="http://www.w3.org/1999/XSL/Transform" xmlns:es="http://pypop.org/lxml/functions">
...  <output method="text" encoding="ASCII"/>
...  <template match="/">
...   <text>Yep [</text>
...   <value-of select="es:format_number_fixed_width(string(/a/b), 5)"/>
...   <text>]</text>
...  </template>
... </stylesheet>
... '''))
>>>
>>> print(xslt(doc))
Yep [4.3e-6]

Note

arguments from XSLT file: num and places are encoded in *args.

Parameters:

_context (obj) – not used

Returns:

formatted number to fixed width

Return type:

str