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# -*- coding: utf-8 -*-
# Copyright (c) 2015-2016 Claudiu Popa <pcmanticore@gmail.com>
# Copyright (c) 2015 Florian Bruhin <me@the-compiler.org>
# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/master/COPYING
"""Functions to generate files readable with Georg Sander's vcg
(Visualization of Compiler Graphs).
You can download vcg at http://rw4.cs.uni-sb.de/~sander/html/gshome.html
Note that vcg exists as a debian package.
See vcg's documentation for explanation about the different values that
maybe used for the functions parameters.
"""
ATTRS_VAL = {
'algos': ('dfs', 'tree', 'minbackward',
'left_to_right', 'right_to_left',
'top_to_bottom', 'bottom_to_top',
'maxdepth', 'maxdepthslow', 'mindepth', 'mindepthslow',
'mindegree', 'minindegree', 'minoutdegree',
'maxdegree', 'maxindegree', 'maxoutdegree'),
'booleans': ('yes', 'no'),
'colors': ('black', 'white', 'blue', 'red', 'green', 'yellow',
'magenta', 'lightgrey',
'cyan', 'darkgrey', 'darkblue', 'darkred', 'darkgreen',
'darkyellow', 'darkmagenta', 'darkcyan', 'gold',
'lightblue', 'lightred', 'lightgreen', 'lightyellow',
'lightmagenta', 'lightcyan', 'lilac', 'turquoise',
'aquamarine', 'khaki', 'purple', 'yellowgreen', 'pink',
'orange', 'orchid'),
'shapes': ('box', 'ellipse', 'rhomb', 'triangle'),
'textmodes': ('center', 'left_justify', 'right_justify'),
'arrowstyles': ('solid', 'line', 'none'),
'linestyles': ('continuous', 'dashed', 'dotted', 'invisible'),
}
# meaning of possible values:
# O -> string
# 1 -> int
# list -> value in list
GRAPH_ATTRS = {
'title': 0,
'label': 0,
'color': ATTRS_VAL['colors'],
'textcolor': ATTRS_VAL['colors'],
'bordercolor': ATTRS_VAL['colors'],
'width': 1,
'height': 1,
'borderwidth': 1,
'textmode': ATTRS_VAL['textmodes'],
'shape': ATTRS_VAL['shapes'],
'shrink': 1,
'stretch': 1,
'orientation': ATTRS_VAL['algos'],
'vertical_order': 1,
'horizontal_order': 1,
'xspace': 1,
'yspace': 1,
'layoutalgorithm': ATTRS_VAL['algos'],
'late_edge_labels': ATTRS_VAL['booleans'],
'display_edge_labels': ATTRS_VAL['booleans'],
'dirty_edge_labels': ATTRS_VAL['booleans'],
'finetuning': ATTRS_VAL['booleans'],
'manhattan_edges': ATTRS_VAL['booleans'],
'smanhattan_edges': ATTRS_VAL['booleans'],
'port_sharing': ATTRS_VAL['booleans'],
'edges': ATTRS_VAL['booleans'],
'nodes': ATTRS_VAL['booleans'],
'splines': ATTRS_VAL['booleans'],
}
NODE_ATTRS = {
'title': 0,
'label': 0,
'color': ATTRS_VAL['colors'],
'textcolor': ATTRS_VAL['colors'],
'bordercolor': ATTRS_VAL['colors'],
'width': 1,
'height': 1,
'borderwidth': 1,
'textmode': ATTRS_VAL['textmodes'],
'shape': ATTRS_VAL['shapes'],
'shrink': 1,
'stretch': 1,
'vertical_order': 1,
'horizontal_order': 1,
}
EDGE_ATTRS = {
'sourcename': 0,
'targetname': 0,
'label': 0,
'linestyle': ATTRS_VAL['linestyles'],
'class': 1,
'thickness': 0,
'color': ATTRS_VAL['colors'],
'textcolor': ATTRS_VAL['colors'],
'arrowcolor': ATTRS_VAL['colors'],
'backarrowcolor': ATTRS_VAL['colors'],
'arrowsize': 1,
'backarrowsize': 1,
'arrowstyle': ATTRS_VAL['arrowstyles'],
'backarrowstyle': ATTRS_VAL['arrowstyles'],
'textmode': ATTRS_VAL['textmodes'],
'priority': 1,
'anchor': 1,
'horizontal_order': 1,
}
# Misc utilities ###############################################################
class VCGPrinter(object):
"""A vcg graph writer.
"""
def __init__(self, output_stream):
self._stream = output_stream
self._indent = ''
def open_graph(self, **args):
"""open a vcg graph
"""
self._stream.write('%sgraph:{\n'%self._indent)
self._inc_indent()
self._write_attributes(GRAPH_ATTRS, **args)
def close_graph(self):
"""close a vcg graph
"""
self._dec_indent()
self._stream.write('%s}\n'%self._indent)
def node(self, title, **args):
"""draw a node
"""
self._stream.write('%snode: {title:"%s"' % (self._indent, title))
self._write_attributes(NODE_ATTRS, **args)
self._stream.write('}\n')
def edge(self, from_node, to_node, edge_type='', **args):
"""draw an edge from a node to another.
"""
self._stream.write(
'%s%sedge: {sourcename:"%s" targetname:"%s"' % (
self._indent, edge_type, from_node, to_node))
self._write_attributes(EDGE_ATTRS, **args)
self._stream.write('}\n')
# private ##################################################################
def _write_attributes(self, attributes_dict, **args):
"""write graph, node or edge attributes
"""
for key, value in args.items():
try:
_type = attributes_dict[key]
except KeyError:
raise Exception('''no such attribute %s
possible attributes are %s''' % (key, attributes_dict.keys()))
if not _type:
self._stream.write('%s%s:"%s"\n' % (self._indent, key, value))
elif _type == 1:
self._stream.write('%s%s:%s\n' % (self._indent, key,
int(value)))
elif value in _type:
self._stream.write('%s%s:%s\n' % (self._indent, key, value))
else:
raise Exception('''value %s isn\'t correct for attribute %s
correct values are %s''' % (value, key, _type))
def _inc_indent(self):
"""increment indentation
"""
self._indent = ' %s' % self._indent
def _dec_indent(self):
"""decrement indentation
"""
self._indent = self._indent[:-2]
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