# HG changeset patch
# User paulb
# Date 1133924607 0
# Node ID 5706a0da1e641f60a2be3623f820c1c11af75487
# Parent  d1533bb2d4d766b6f3897368eb000b0bfe65d30e
[project @ 2005-12-07 03:03:27 by paulb]
Added an experimental range function, although memory usage issues may not
be fully addressed.

diff -r d1533bb2d4d7 -r 5706a0da1e64 XSLForms/Output.py
--- a/XSLForms/Output.py	Wed Dec 07 03:03:02 2005 +0000
+++ b/XSLForms/Output.py	Wed Dec 07 03:03:27 2005 +0000
@@ -318,6 +318,53 @@
 
 # Utility functions.
 
+def xslforms_range(context, range_spec):
+
+    """
+    Exposed as {template:range(range_spec)}.
+
+    The 'range_spec' is split up into 'start', 'finish' and 'step' according to
+    the following format:
+
+    start...finish...step
+
+    Provides the Python range function by producing a list of numbers, starting
+    at 'start', ending one step before 'finish', and employing the optional
+    'step' to indicate the magnitude of the difference between successive
+    elements in the list as well as the "direction" of the sequence. By default,
+    'step' is set to 1.
+
+    NOTE: This uses a single string because template:element and other
+    NOTE: annotations use commas to separate fields, thus making the usage of
+    NOTE: this function impossible if each range parameter is exposed as a
+    NOTE: function parameter.
+    NOTE: The returning of values from this function is not fully verified, and
+    NOTE: it is probably better to use other extension functions instead of this
+    NOTE: one to achieve simple results (such as str:split from EXSLT).
+    """
+
+    parts = range_spec.split("...")
+    start, finish = parts[:2]
+    if len(parts) > 2:
+        step = parts[2]
+    else:
+        step = None
+
+    start = int(start)
+    finish = int(finish)
+    if step is not None:
+        step = int(step)
+    else:
+        step = 1
+
+    # Create a list of elements.
+    # NOTE: libxslt complains: "Got a CObject"
+
+    range_elements = libxml2mod.xmlXPathNewNodeSet(None)
+    for i in range(start, finish, step):
+        range_elements.append(libxml2mod.xmlNewText(str(i)))
+    return range_elements
+
 def i18n(context, value):
 
     """
@@ -459,6 +506,7 @@
 
 # Utility functions.
 
+libxsltmod.xsltRegisterExtModuleFunction("range", "http://www.boddie.org.uk/ns/xmltools/template", xslforms_range)
 libxsltmod.xsltRegisterExtModuleFunction("i18n", "http://www.boddie.org.uk/ns/xmltools/template", i18n)
 libxsltmod.xsltRegisterExtModuleFunction("choice", "http://www.boddie.org.uk/ns/xmltools/template", choice)
 libxsltmod.xsltRegisterExtModuleFunction("url-encode", "http://www.boddie.org.uk/ns/xmltools/template", url_encode)