From 8773f6b58f127057a1d12bb03a0ae386e5cebdbe Mon Sep 17 00:00:00 2001
From: Tim Van Baak <tim.vanbaak@gmail.com>
Date: Tue, 23 Apr 2019 23:56:59 -0700
Subject: [PATCH] Add title-turn uniqueness check

---
 lexipython/article.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lexipython/article.py b/lexipython/article.py
index 2a6da84..4490809 100644
--- a/lexipython/article.py
+++ b/lexipython/article.py
@@ -172,6 +172,13 @@ class LexiconArticle:
 		Fills out fields on articles that require other articles for context.
 		Creates phantom articles.
 		"""
+		# Preliminary assertion that title/turn is unique
+		keys = set()
+		for article in lexicon_articles:
+			if (article.title, article.turn) in keys:
+				raise ValueError("Found two articles with title '{}' and turn '{}'".format(
+					article.title, article.turn))
+			keys.add((article.title, article.turn))
 		# Sort out which articles are addendums and which titles are phantoms
 		written_titles = set()
 		cited_titles = set()