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app.py
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Fri, Oct 18, 08:08

app.py
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import streamlit as st
import subprocess
import base64
import tempfile
import os
st.set_page_config(layout="wide")
st.markdown('# Class hierarchy UML generator')
text = st.text_area('Insert your class hierarchy here', value='''
class Animal
public pure virtual void scream();
public std::string & getName();
public void setName(std::string & toto);
protected std::string name;
class Cat(Animal)
public virtual void scream();
class Dog(Animal)
public virtual void scream();
''', height=500)
def generate_class_diag(collab=False, inheritance=True):
with tempfile.NamedTemporaryFile(mode='w') as f:
f.write(text)
f.flush()
fname = f.name
opt = ''
if not collab:
opt += ' --collaboration_no'
if not inheritance:
opt += ' --inheritance_no'
p = subprocess.run(
f'class_dumper_dot {opt} -c {fname} -f svg -o {fname}.svg',
shell=True,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE
)
try:
p.check_returncode()
except subprocess.CalledProcessError as e:
st.error("failed launching class_dumper_dot")
if e.stderr:
st.error(f"{e.stderr.decode()}")
return
p = subprocess.run(
f'class_dumper_dot {opt} -c {fname} -f pdf -o {fname}.pdf',
shell=True,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE
)
try:
p.check_returncode()
except subprocess.CalledProcessError as e:
st.error("failed launching class_dumper_dot")
if e.stderr:
st.error(f"{e.stderr.decode()}")
return
with open(f'{fname}.svg', 'rb') as f:
b64_svg = base64.b64encode(f.read()).decode("utf-8")
with open(f'{fname}.pdf', 'rb') as f:
pdf = f.read()
with open(f'{fname}.svg', 'rb') as f:
svg = f.read()
os.remove(f'{fname}.svg')
os.remove(f'{fname}.dot')
os.remove(f'{fname}.pdf')
return svg, pdf, b64_svg
col1, col2, col3 = st.columns(3)
collab = col2.checkbox("Show Collaborations", value=False)
inheritance = col1.checkbox("Show Inheritance", value=True)
svg, pdf, b64_svg = generate_class_diag(collab, inheritance)
col1, col2, col3 = st.columns(3)
col1.download_button('Download as PDF', data=pdf,
file_name='uml.pdf', use_container_width=True)
col2.download_button('Download as SVG', data=svg,
file_name='uml.svg', use_container_width=True)
col3.download_button('Download as classes', data=text,
file_name='uml.classes', use_container_width=True)
zoom = st.slider("Zoom level", value=50, min_value=1, max_value=100)
html = r'<center><img src="data:image/svg+xml;base64,%s" ' % b64_svg
html += f'width="{zoom}%"/></center>'
st.write(html, unsafe_allow_html=True)

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