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class GraphPage(object):
"""Base class for the client-side content of one of the 'pages'
(one graph) sent over to and displayed by the external process.
"""
save_tmp_file = None
def __init__(self, *args, **kwds):
self.args = args
self.kwds = kwds
def content(self):
"""Compute the content of the page.
This doesn't modify the page in place; it returns a new GraphPage.
"""
if hasattr(self, 'source'):
return self
else:
new = self.__class__()
new.source = '' # '''dot source'''
new.links = {} # {'word': 'statusbar text'}
new.compute(*self.args, **self.kwds) # defined in subclasses
return new
def followlink(self, word):
raise KeyError
def display(self):
"Display a graph page."
import graphclient, msgstruct
try:
graphclient.display_page(self, save_tmp_file=self.save_tmp_file)
except msgstruct.RemoteError, e:
import sys
print >> sys.stderr, "Exception in the graph viewer:", str(e)
def display_background(self):
"Display a graph page in a background thread."
try:
import thread
thread.start_new_thread(self.display, ())
except ImportError:
self.display()
class DotFileGraphPage(GraphPage):
def compute(self, dotfile):
import codecs
from strunicode import RAW_ENCODING
f = codecs.open(dotfile, 'r', RAW_ENCODING)
self.source = f.read()
f.close()
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