From 071e6db304cacb47248994a119182a7cf3aa0e29 Mon Sep 17 00:00:00 2001
From: RunasSudo <runassudo@yingtongli.me>
Date: Sun, 15 Sep 2019 00:32:48 +1000
Subject: [PATCH] Don't generate hyperlinks for un-referenceable headings/items
 (e.g. inside quotes)

---
 legalmd/latex_renderer.py | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/legalmd/latex_renderer.py b/legalmd/latex_renderer.py
index 76e3ab1..bf786f9 100644
--- a/legalmd/latex_renderer.py
+++ b/legalmd/latex_renderer.py
@@ -93,11 +93,14 @@ class LaTeXRenderer(mistletoe.latex_renderer.LaTeXRenderer):
 			)
 	
 	def render_numbered_heading(self, token):
-		sha = hashlib.sha256()
-		sha.update(token.full_label().encode('utf-8'))
-		hyperlink = format(r'\hypertarget{<linkname>}{}',
-			linkname=sha.hexdigest()
-		)
+		if token.full_label():
+			sha = hashlib.sha256()
+			sha.update(token.full_label().encode('utf-8'))
+			hyperlink = format(r'\hypertarget{<linkname>}{}',
+				linkname=sha.hexdigest()
+			)
+		else:
+			hyperlink = '{}'
 		
 		if token.level == 1:
 			# Part
@@ -155,11 +158,14 @@ class LaTeXRenderer(mistletoe.latex_renderer.LaTeXRenderer):
 	
 	def render_subrules_item(self, token):
 		if token.label:
-			sha = hashlib.sha256()
-			sha.update(token.full_label().encode('utf-8'))
-			hyperlink = format(r'\hypertarget{<linkname>}{}',
-				linkname=sha.hexdigest()
-			)
+			if token.full_label():
+				sha = hashlib.sha256()
+				sha.update(token.full_label().encode('utf-8'))
+				hyperlink = format(r'\hypertarget{<linkname>}{}',
+					linkname=sha.hexdigest()
+				)
+			else:
+				hyperlink = '{}'
 			
 			return format(r'\N{\par<hyperlink>\leftskip=\dimexpr\quotemargin+<lmarg>+<level>cm\relax\hangindent=1cm\parskip=<parskip>\makebox[<lmarg>][l]{<label>}<content>\par}\N',
 				hyperlink=hyperlink,