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# Copyright (c) 2015-2018, 2020 Claudiu Popa <pcmanticore@gmail.com>
# Copyright (c) 2015 Florian Bruhin <me@the-compiler.org>
# Copyright (c) 2018 ssolanki <sushobhitsolanki@gmail.com>
# Copyright (c) 2020-2021 Pierre Sassoulas <pierre.sassoulas@gmail.com>
# Copyright (c) 2020 hippo91 <guillaume.peillex@gmail.com>
# Copyright (c) 2020 Ram Rachum <ram@rachum.com>
# Copyright (c) 2020 谭九鼎 <109224573@qq.com>
# Copyright (c) 2020 Anthony Sottile <asottile@umich.edu>
# 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 https://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:
"""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(f'{self._indent}node: {{title:"{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 as e:
raise Exception(
"""no such attribute %s
possible attributes are %s"""
% (key, attributes_dict.keys())
) from e
if not _type:
self._stream.write(f'{self._indent}{key}:"{value}"\n')
elif _type == 1:
self._stream.write(f"{self._indent}{key}:{int(value)}\n")
elif value in _type:
self._stream.write(f"{self._indent}{key}:{value}\n")
else:
raise Exception(
f"""value {value} isn't correct for attribute {key}
correct values are {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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