analyzeJSON/ExtractText.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using Newtonsoft.Json.Linq;
+
+namespace analyzeJSON
+{
+    public class ExtractText
+    {
+        private readonly Dictionary<string, bool> keysToExtract;
+        private readonly Dictionary<string, List<string>> extracted = new();
+
+        public ExtractText(Dictionary<string, bool> keys)
+        {
+            keysToExtract = keys ?? throw new ArgumentNullException(nameof(keys));
+        }
+
+        public void Extract(JToken token)
+        {
+            if (token.Type != JTokenType.String)
+                return;
+
+            var tokenName = AnalyzeJSON.GetNameFromPath(token.Path);
+            if (string.IsNullOrWhiteSpace(tokenName))
+                return;
+
+            if (!keysToExtract.ContainsKey(tokenName))
+                return;
+
+            if (!extracted.ContainsKey(tokenName))
+                extracted.Add(tokenName, new List<string>());
+
+            extracted[tokenName].Add(token.Value<string>());
+        }
+
+        public Dictionary<string, List<string>> Result => extracted;
+    }
+}

analyzeJSONTests/ExtractTextUnitTests.cs

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+using Xunit;
+using analyzeJSON;
+using System;
+using System.Collections.Generic;
+using Newtonsoft.Json.Linq;
+
+namespace analyzeJSONTests
+{
+    public class ExtractTextUnitTests
+    {
+        [Fact]
+        public void ExtractText_NullKeys()
+        {
+            Assert.Throws<ArgumentNullException>(() => new ExtractText(null));
+        }
+
+        [Fact]
+        public void ExtractText_AllGood()
+        {
+            dynamic token = new JObject();
+            token.one = "Lorem ipsum dolor";
+            token.two = "Lorem      ipsum dolor";
+            token.three = "Lorem\nipsum dolor";
+
+            var keys = new Dictionary<string, bool>
+            {
+                ["one"] = true,
+                ["two"] = false
+            };
+
+            var test = new ExtractText(keys);
+            test.Extract(token.one);
+            test.Extract(token.two);
+            test.Extract(token.three);
+
+            Assert.Equal(2, test.Result.Count);
+        }
+    }
+}