#!/usr/bin/env python

# -*- coding: utf-8 -*-

# This file is part of Beremiz.

# See COPYING file for copyrights details.

from __future__ import absolute_import

import os

from lxml import etree

import util.paths as paths

from plcopen.structures import StdBlckLibs

ScriptDirectory = paths.AbsDir(__file__)

class XSLTModelQuery(object):

""" a class to handle XSLT queries on project and libs """

def __init__(self, controller, xsltpath, ext=None):

# arbitrary set debug to false, updated later

self.debug = False

# merge xslt extensions for library access to query specific ones

xsltext = [

("GetProject", lambda *_ignored:

[controller.GetProject(self.debug)]),

("GetStdLibs", lambda *_ignored:

[lib for lib in StdBlckLibs.values()]),

("GetExtensions", lambda *_ignored:

[ctn["types"] for ctn in controller.ConfNodeTypes])

]

if ext is not None:

xsltext.extend(ext)

# parse and compile. "beremiz" arbitrary namespace for extensions

self.xslt = etree.XSLT(

etree.parse(

os.path.join(ScriptDirectory, xsltpath),

etree.XMLParser()),

extensions={("beremiz", name): call for name, call in xsltext})

def _process_xslt(self, root, debug, **kwargs):

self.debug = debug

res = self.xslt(root, **{k: etree.XSLT.strparam(v) for k, v in kwargs.iteritems()})

# print(self.xslt.error_log)

return res

# -------------------------------------------------------------------------------

# Helpers functions for translating list of arguments

# from xslt to valid arguments

# -------------------------------------------------------------------------------

def _StringValue(x):

return x

def _BoolValue(x):

return x in ["true", "0"]

def _translate_args(translations, args):

return [translate(arg[0]) if len(arg) > 0 else None

for translate, arg in

zip(translations, args)]