From e1555e35585a5059fb9afa23e7b7592b3bfe947c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Ros?= <sebastienros@gmail.com>
Date: Wed, 10 Feb 2021 11:10:58 -0800
Subject: [PATCH] Define fallback scope in TemplateOptions (#263)

---
 Fluid.Tests/TemplateContextTests.cs | 24 +++++++++++++++++++++++-
 Fluid/TemplateContext.cs            |  3 ++-
 Fluid/TemplateOptions.cs            |  5 +++++
 3 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/Fluid.Tests/TemplateContextTests.cs b/Fluid.Tests/TemplateContextTests.cs
index e0ce1a23..fcacaff8 100644
--- a/Fluid.Tests/TemplateContextTests.cs
+++ b/Fluid.Tests/TemplateContextTests.cs
@@ -1,4 +1,5 @@
-using System;
+using Fluid.Values;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -28,5 +29,26 @@ private static async Task Register()
             var templateContext = new TemplateContext();
             templateContext.Options.MemberAccessStrategy.Register(typeof(TestClass));
         }
+
+
+        [Fact]
+        public void ScopeShouldFallbackToTemplateOptions()
+        {
+            var parser = new FluidParser();
+
+            parser.TryParse("{{ p.NaMe }}", out var template, out var error);
+
+            var options = new TemplateOptions();
+            options.Scope.SetValue("o1", new StringValue("o1"));
+            options.Scope.SetValue("o2", new StringValue("o2"));
+
+            var context = new TemplateContext(options);
+            context.SetValue("o2", "new o2");
+            context.SetValue("o3", "o3");
+
+            Assert.Equal("o1", context.GetValue("o1").ToStringValue());
+            Assert.Equal("new o2", context.GetValue("o2").ToStringValue());
+            Assert.Equal("o3", context.GetValue("o3").ToStringValue());
+        }
     }
 }
diff --git a/Fluid/TemplateContext.cs b/Fluid/TemplateContext.cs
index b2c69a8c..da45d833 100644
--- a/Fluid/TemplateContext.cs
+++ b/Fluid/TemplateContext.cs
@@ -2,6 +2,7 @@
 using System;
 using System.Collections.Generic;
 using System.Globalization;
+using System.Threading.Tasks;
 
 namespace Fluid
 {
@@ -33,7 +34,7 @@ public TemplateContext(TemplateOptions options)
         {
             Options = options;
 
-            LocalScope = new Scope();
+            LocalScope = new Scope(options.Scope);
 
             LocalScope.SetValue("empty", NilValue.Empty);
             LocalScope.SetValue("blank", StringValue.Empty);
diff --git a/Fluid/TemplateOptions.cs b/Fluid/TemplateOptions.cs
index f009fd08..871fc237 100644
--- a/Fluid/TemplateOptions.cs
+++ b/Fluid/TemplateOptions.cs
@@ -45,6 +45,11 @@ public class TemplateOptions
         /// </summary>
         public FilterCollection Filters { get; } = new FilterCollection();
 
+        /// <summary>
+        /// Gets a scope that is available in all the templates.
+        /// </summary>
+        public Scope Scope { get; } = new Scope();
+
         /// <summary>
         /// Gets the list of value converters.
         /// </summary>