plcopen/XSLTModelQuery.py
author Edouard Tisserant
Wed, 23 Nov 2022 11:27:55 +0100
changeset 3685 570a738239f4
parent 2627 3ba6a2d26507
child 3750 f62625418bff
permissions -rw-r--r--
SVGHMI: Add arbitrary variable assignment when entering Pages

Usage similar to Assign widget.
Required instanciating PageWidgets for each page, so that assigned variables can be subsribed.
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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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import os
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from lxml import etree
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import util.paths as paths
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from plcopen.structures import StdBlckLibs
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from XSLTransform import XSLTransform
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ScriptDirectory = paths.AbsDir(__file__)
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class XSLTModelQuery(XSLTransform):
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    """ a class to handle XSLT queries on project and libs """
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    def __init__(self, controller, xsltpath, ext=None):
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        # arbitrary set debug to false, updated later
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        self.debug = False
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        # merge xslt extensions for library access to query specific ones
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        xsltext = [
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            ("GetProject", lambda *_ignored:
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             [controller.GetProject(self.debug)]),
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            ("GetStdLibs", lambda *_ignored:
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             [lib for lib in StdBlckLibs.values()]),
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            ("GetExtensions", lambda *_ignored:
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             [ctn["types"] for ctn in controller.ConfNodeTypes])
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        ]
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        if ext is not None:
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            xsltext.extend(ext)
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        XSLTransform.__init__(self,
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                           os.path.join(ScriptDirectory, xsltpath),
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                           xsltext)
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    def _process_xslt(self, root, debug, **kwargs):
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        self.debug = debug
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        return self.transform(root, **kwargs)
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# -------------------------------------------------------------------------------
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#           Helpers functions for translating list of arguments
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#                       from xslt to valid arguments
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# -------------------------------------------------------------------------------
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def _StringValue(x):
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    return x
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def _BoolValue(x):
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    return x in ["true", "0"]
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def _translate_args(translations, args):
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    return [translate(arg[0]) if len(arg) > 0 else None
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            for translate, arg in
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            zip(translations, args)]