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import streamlit as st
import unidecode
DISABLE_LINK_CSS = """
<style>
a.toc {
color: inherit;
text-decoration: none; /* no underline */
}
</style>"""
class stoc:
def __init__(self):
self.toc_items = list()
def h1(self, text: str, write: bool = True):
if write:
st.write(f"# {text}")
self.toc_items.append(("h1", text))
def h2(self, text: str, write: bool = True):
if write:
st.write(f"## {text}")
self.toc_items.append(("h2", text))
def h3(self, text: str, write: bool = True):
if write:
st.write(f"### {text}")
self.toc_items.append(("h3", text))
def toc(self):
st.write(DISABLE_LINK_CSS, unsafe_allow_html=True)
st.sidebar.caption("Table of contents")
markdown_toc = ""
for title_size, title in self.toc_items:
h = int(title_size.replace("h", ""))
markdown_toc += (
" " * 2 * h
+ "- "
+ f'<a href="#{normalize(title)}" class="toc"> {title}</a> \n'
)
st.sidebar.write(markdown_toc, unsafe_allow_html=True)
@classmethod
def from_markdown(cls, text: str):
self = cls()
for line in text.splitlines():
if line.startswith("###"):
self.h3(line[3:], write=False)
elif line.startswith("##"):
self.h2(line[2:], write=False)
elif line.startswith("#"):
self.h1(line[1:], write=False)
st.write(text)
self.toc()
def normalize(s):
"""
Normalize titles as valid HTML ids for anchors
>>> normalize("it's a test to spot how Things happ3n héhé")
"it-s-a-test-to-spot-how-things-happ3n-h-h"
"""
# Replace accents with "-"
s_wo_accents = unidecode.unidecode(s)
accents = [s for s in s if s not in s_wo_accents]
for accent in accents:
s = s.replace(accent, "-")
# Lowercase
s = s.lower()
# Keep only alphanum and remove "-" suffix if existing
normalized = (
"".join([char if char.isalnum() else "-" for char in s]).strip("-").lower()
)
return normalized
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