From afbcedeb8dc954dacb4669f53910a3193e806ec5 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Mon, 21 Oct 2024 17:37:23 +0100
Subject: [PATCH] Update tutorials from cylc-flow (#2816)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 .../lib/python/util.py                          | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/metomi/rose/etc/tutorial/cylc-forecasting-workflow/lib/python/util.py b/metomi/rose/etc/tutorial/cylc-forecasting-workflow/lib/python/util.py
index 6f24b28cb..6450bbc16 100644
--- a/metomi/rose/etc/tutorial/cylc-forecasting-workflow/lib/python/util.py
+++ b/metomi/rose/etc/tutorial/cylc-forecasting-workflow/lib/python/util.py
@@ -282,13 +282,18 @@ def __call__(self, grid_x, grid_y):
         return z_val
 
 
-def parse_domain(domain):
-    bbox = list(map(float, domain.split(',')))
+def parse_domain(domain: str):
+    lng1, lat1, lng2, lat2 = list(map(float, domain.split(',')))
+    msg = "Invalid domain '{}' ({} {} >= {})"
+    if lng1 >= lng2:
+        raise ValueError(msg.format(domain, 'longitude', lng1, lng2))
+    if lat1 >= lat2:
+        raise ValueError(msg.format(domain, 'latitude', lat1, lat2))
     return {
-        'lng1': bbox[0],
-        'lat1': bbox[1],
-        'lng2': bbox[2],
-        'lat2': bbox[3]
+        'lng1': lng1,
+        'lat1': lat1,
+        'lng2': lng2,
+        'lat2': lat2,
     }