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# This is a component of AXIS, a front-end for emc
# Copyright 2007 Anders Wallin <anders.wallin@helsinki.fi>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""
Parses a pyVCP XML file and creates widgets by calling pyvcp_widgets.py
"""
import xml.dom.minidom
from Tkinter import *
import sys, os
import linuxcnc
import pyvcp_widgets
import hal
import time
import traceback
# this statement is required so that stuff from Tkinter
# is not included in the pydoc documentation __All__ should list all
# functions in this module
__all__=["read_file","nodeiterator",
"widget_creator","paramiterator","updater","create_vcp"]
def read_file():
"""
Reads the XML file specified by global 'filename'
finds the <pyvcp> element and starts the parsing of the
file by calling nodeiterator()
"""
try:
doc = xml.dom.minidom.parse(filename)
except xml.parsers.expat.ExpatError, detail:
print "Error: could not open",filename,"!"
print detail
sys.exit(1)
# find the pydoc element
for e in doc.childNodes:
if e.nodeType == e.ELEMENT_NODE and e.localName == "pyvcp":
break
if e.localName != "pyvcp":
print "Error: no pyvcp element in file!"
sys.exit()
pyvcproot=e
nodeiterator(pyvcproot,pyvcp0)
num=0
def nodeiterator(node,widgetparent):
"""
A recursive function that traverses the dom tree
and calls widget_creator() when it finds a valid element
"""
global num
num+=1
params=[]
for e in node.childNodes:
if e.nodeType == e.ELEMENT_NODE and (e.nodeName in pyvcp_widgets.elements):
params = paramiterator(e) # find all the parameters for this node
newwidget = widget_creator(widgetparent,e.nodeName,params)
nodeiterator(e,newwidget)
widgets=[];
def widget_creator(parent,widget_name,params):
"""
creates a pyVCP widget
parent = parent widget
widget_name = name of widget to be created
params = a list of parameters passed to the widget __init__
"""
global widgets
constructor = getattr(pyvcp_widgets, "pyvcp_" + str(widget_name))
if hasattr(parent, "getcontainer"):
container = parent.getcontainer()
else:
container = parent
positional_params = (container, pycomp)
try:
widget = constructor(*positional_params, **params)
except Exception, detail:
raise SystemExit, "Error constructing %s(%s):\n%s" % (
widget_name, params, detail)
# pack the widget according to parent
# either hbox or vbox
if container==pyvcp0:
widget.pack(side='top', fill=BOTH, expand=YES)
else:
parent.add(container, widget)
# add the widget to a global list widgets
# to enable calling update() later
widgets.append(widget)
return widget
def paramiterator(node):
""" returns a list of all parameters for a widget element """
outparams = {}
for k, v in node.attributes.items():
if v and v[0] in "{[(\"'":
v = eval(v)
else:
try:
v = int(v)
except ValueError:
try:
v = float(v)
except ValueError:
pass
outparams[str(k)] = v
for e in node.childNodes:
if e.nodeType == e.ELEMENT_NODE \
and (e.nodeName not in pyvcp_widgets.elements):
try:
v = eval(e.childNodes[0].nodeValue)
except:
exc_type, exc_value, exc_tb = sys.exc_info()
raise SystemExit, ("Error evaluating xml file:\n"
"Widget %s, Property %s\n%s: %s") % (
node.nodeName, e.nodeName, exc_type.__name__, exc_value)
outparams[str(e.nodeName)] = v
return outparams
def updater():
""" calls pyvcp_widgets.update() on each widget repeatedly every 100 ms """
global widgets, pycomp
for a in widgets:
a.update(pycomp)
pyvcp0.after(100,updater)
def create_vcp(master, comp = None, compname="pyvcp"):
"""
create a pyVCP panel
master = Tkinter root window or other master container
comp = HAL component
compname = name of HAL component which is created if comp=None
"""
global pyvcp0, pycomp
pyvcp0 = master
if comp is None:
try:
comp = hal.component(compname)
except:
print "Error: Multiple components with the same name."
sys.exit(0)
pycomp = comp
read_file()
updater()
return comp
if __name__ == '__main__':
print "You can't run vcpparse.py by itself..."
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