Created
December 19, 2022 20:45
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#!/usr/bin/env python3 | |
import re | |
import sys | |
from huffman import Node | |
from huffman import count_frequencies | |
from huffman import build_tree | |
import pydot | |
def draw(tree): | |
graph = pydot.Dot('tree', graph_type='digraph') | |
root = unwind_to(tree, graph) | |
print(graph) | |
def unwind_to(tree, graph): | |
if not tree: | |
return None | |
def to_name(c): | |
c = ''.join(sorted(c)) | |
return f'"{c}"' | |
def to_label(c, w): | |
c = ''.join(sorted(c)) | |
return f'[{c}] {w}' | |
name = to_name(tree[0]) | |
weight = tree[1] | |
left = tree[2] | |
right = tree[3] | |
node_label = to_label(tree[0], weight) | |
new_node = pydot.Node( | |
name, label=node_label, shape='box', | |
fontname='Fantasque Sans Mono', ordering='in') | |
if left: | |
left_node = unwind_to(left, graph) | |
left_name = to_name(left[0]) | |
left_weight = left[1] | |
left_label = to_label(left[0], left_weight) | |
graph.add_edge(pydot.Edge(name, left_name, label=' 0 ')) | |
if right: | |
right_node = unwind_to(right, graph) | |
right_name = to_name(right[0]) | |
right_weight = right[1] | |
right_label = to_label(right[0], right_weight) | |
graph.add_edge(pydot.Edge(name, right_name, label=' 1 ')) | |
graph.add_node(new_node) | |
return new_node | |
if __name__ == '__main__': | |
if len(sys.argv) < 2: | |
dot_cmd = 'dot -Tpng graph.dot > graph.png' | |
print(f'usage: {sys.argv[0]} [file] > graph.dot && {dot_cmd}') | |
sys.exit(1) | |
with open(sys.argv[1]) as f: | |
text = f.read() | |
# simplification: only a sub-set of characters | |
text = re.sub('[^-.,:;!?#/a-zA-Z0-9]', '', text) | |
freqs = count_frequencies(text) | |
tree = build_tree(freqs) | |
draw(tree) |
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