From e306b2366341071354a50c71ae0e08c9f40e3714 Mon Sep 17 00:00:00 2001
From: Filip Strajnar <filip.strajnar@gmail.com>
Date: Mon, 24 Jun 2024 11:01:19 +0200
Subject: [PATCH] Added some useful parsing functions.

---
 OsmToDatabase.Common/TagParsing.cs | 33 ++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 OsmToDatabase.Common/TagParsing.cs

diff --git a/OsmToDatabase.Common/TagParsing.cs b/OsmToDatabase.Common/TagParsing.cs
new file mode 100644
index 0000000..ba79e74
--- /dev/null
+++ b/OsmToDatabase.Common/TagParsing.cs
@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using OsmSharp;
+using OsmSharp.Tags;
+
+namespace OsmToDatabase.Common
+{
+    public static class TagParsing
+    {
+        /// <summary>
+        /// Gets the value of a tag with the given key.
+        /// </summary>
+        /// <param name="node">Node that is being searched for tags.</param>
+        /// <param name="tagKey">Key of the tag that is being searched for.</param>
+        /// <returns>Value of the tag, or null if it is not found.</returns>
+        public static string? TagValueByKey(this Node node, string tagKey)
+        {
+            return node
+                .Tags.Select<Tag, Tag?>(t => t)
+                .FirstOrDefault(tag => tag is not null && tag.Value.Key == tagKey)
+                ?.Value;
+        }
+
+        public static double? TagDoubleValueByKey(this Node node, string tagKey)
+        {
+            string? tagValue = node.TagValueByKey(tagKey);
+            bool success = double.TryParse(tagValue, out double result);
+            return success ? result : null;
+        }
+    }
+}