XSLTransform.py
author Edouard Tisserant
Tue, 23 Aug 2022 12:19:44 +0200
changeset 3594 30f7eade322f
parent 3165 2db69e2c5673
child 3750 f62625418bff
permissions -rw-r--r--
SVGHMI: add support for "enable expressions" with arbitrary variable name assignment.

HMI tree paths can be prefixed with a variable name "@name=/MY/HMI/VAR"
Widget declarations can end with a "#" followed by a JS expression that refers to name given to variables.
Widget is disabled if expression's result is false.

Commit includes some more-or-less related generated code refactoring, that should simplify extending widget's variables attributes.
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# This file is part of Beremiz.
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# See COPYING file for copyrights details.
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from __future__ import absolute_import
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from lxml import etree
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class XSLTransform(object):
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    """ a class to handle XSLT queries on project and libs """
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    def __init__(self, xsltpath, xsltext):
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        # parse and compile. "beremiz" arbitrary namespace for extensions
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        self.xslt = etree.XSLT(
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            etree.parse(
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                xsltpath,
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                etree.XMLParser()),
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            extensions={("beremiz", name): call for name, call in xsltext})
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2db69e2c5673 SVGHMI: Optimized overlapping geometry (widget ot page belonging) computation. Added human readable messages for progress. Includes updated XSLT.
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    def transform(self, root, profile_run=False, **kwargs):
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        res = self.xslt(root, profile_run=profile_run, **{k: etree.XSLT.strparam(v) for k, v in kwargs.iteritems()})
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        # print(self.xslt.error_log)
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        return res
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    def get_error_log(self):
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        return self.xslt.error_log
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