edouard@1940: #!/usr/bin/env python
edouard@1940: # -*- coding: utf-8 -*-
edouard@1940: # This file is part of Beremiz.
edouard@1940: # See COPYING file for copyrights details.
edouard@1940: 
edouard@1940: from __future__ import absolute_import
edouard@1940: import os
edouard@1940: from lxml import etree
edouard@1940: import util.paths as paths
edouard@1940: from plcopen.structures import StdBlckLibs
edouard@1940: 
edouard@1940: ScriptDirectory = paths.AbsDir(__file__)
edouard@1940: 
edouard@1944: 
edouard@1940: class XSLTModelQuery(object):
edouard@1940:     """ a class to handle XSLT queries on project and libs """
edouard@1940:     def __init__(self, controller, xsltpath, ext = []):
edouard@1940:         # arbitrary set debug to false, updated later
edouard@1940:         self.debug = False
edouard@1940: 
edouard@1940:         # merge xslt extensions for library access to query specific ones
edouard@1940:         xsltext = [
edouard@1940:             ("GetProject", lambda *_ignored: 
edouard@1940:                 controller.GetProject(self.debug)),
edouard@1940:             ("GetStdLibs", lambda *_ignored: 
edouard@1940:                 [lib for lib in StdBlckLibs.values()]),
edouard@1940:             ("GetExtensions", lambda *_ignored: 
edouard@1940:                 [ctn["types"] for ctn in controller.ConfNodeTypes])
edouard@1940:         ] + ext
edouard@1940: 
edouard@1940:         # parse and compile. "beremiz" arbitrary namespace for extensions 
edouard@1940:         self.xslt = etree.XSLT(
edouard@1940:             etree.parse(
edouard@1940:                 os.path.join(ScriptDirectory, xsltpath),
edouard@1940:                 etree.XMLParser()),
edouard@1940:             extensions={ ("beremiz", name):call for name, call in xsltext})
edouard@1940: 
edouard@1940:     def _process_xslt(self, root, debug, **kwargs):
edouard@1940:         self.debug = debug
edouard@1943:         res = self.xslt(root,**{k:etree.XSLT.strparam(v) for k,v in kwargs.iteritems()})
edouard@1943:         # print(self.xslt.error_log)
edouard@1943:         return res
edouard@1944: 
edouard@1944: 
edouard@1944: # -------------------------------------------------------------------------------
edouard@1944: #           Helpers functions for translating list of arguments
edouard@1944: #                       from xslt to valid arguments
edouard@1944: # -------------------------------------------------------------------------------
edouard@1944: 
edouard@1944: 
edouard@1944: def _StringValue(x):
edouard@1944:     return x
edouard@1944: 
edouard@1944: 
edouard@1944: def _BoolValue(x):
edouard@1944:     return x in ["true", "0"]
edouard@1944: 
edouard@1944: 
edouard@1944: def _translate_args(translations, args):
edouard@1944:     return [translate(arg[0]) if len(arg) > 0 else None
edouard@1944:             for translate, arg in
edouard@1944:             zip(translations, args)]
edouard@1944: