Pop Context When Exiting Tag

I was not removing context when I was leaving a tag. This caused the
context to grow indefinitely, which is not a valid representation of
where the placeholder was located in the template.

mustache-sharp.test/FormatCompilerTester.cs

@@ -362,10 +362,34 @@ Content";
 
             Assert.IsNotNull(context, "The context was not set.");
             Assert.AreEqual(2, context.Length, "The context did not contain the right number of items.");
-            Assert.AreEqual(String.Empty, context[0].Tag.Name, "The top-most context had the wrong tag type.");
-            Assert.AreEqual("this", context[0].Argument, "The top-level argument should always be 'this'.");
-            Assert.AreEqual("with", context[1].Tag.Name, "The inner context should have been a 'with' tag.");
-            Assert.AreEqual("Address", context[1].Argument, "The inner context argument was wrong.");
+
+            Assert.AreEqual(String.Empty, context[0].TagName, "The top-most context had the wrong tag type.");
+            Assert.AreEqual("with", context[1].TagName, "The bottom context had the wrong tag type.");
+
+            Assert.AreEqual(0, context[0].Parameters.Length, "The top-most context had the wrong number of parameters.");
+            Assert.AreEqual(1, context[1].Parameters.Length, "The bottom context had the wrong number of parameters.");
+            Assert.AreEqual("Address", context[1].Parameters[0].Argument, "The bottom context had the wrong argument.");
+        }
+
+        /// <summary>
+        /// I was leaving behind context even after reaching a closing tag. We need to make sure
+        /// that context is like a call stack and that it is cleaned up after leaving the context.
+        /// </summary>
+        [TestMethod]
+        public void TestCompile_ExitContext_RemoveContext()
+        {
+            FormatCompiler compiler = new FormatCompiler();
+            Context[] context = null;
+            compiler.PlaceholderFound += (o, e) =>
+            {
+                context = e.Context;
+            };
+            compiler.Compile(@"{{#with Address}}{{/with}}{{FirstName}}");
+
+            Assert.IsNotNull(context, "The context was not set.");
+            Assert.AreEqual(1, context.Length, "The context did not contain the right number of items.");
+
+            Assert.AreEqual(String.Empty, context[0].TagName, "The top-most context had the wrong tag type.");
         }
 
         #endregion

mustache-sharp.test/Properties/AssemblyInfo.cs

@@ -31,5 +31,5 @@ using System.Runtime.InteropServices;
 //
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("0.0.7.0")]
-[assembly: AssemblyFileVersion("0.0.7.0")]
+[assembly: AssemblyVersion("0.0.7.1")]
+[assembly: AssemblyFileVersion("0.0.7.1")]

mustache-sharp/CompoundGenerator.cs

@@ -26,20 +26,6 @@ namespace mustache
             _primaryGenerators = new LinkedList<IGenerator>();
         }
 
-        /// <summary>
-        /// Gets the argument that will act as the context for the content.
-        /// </summary>
-        /// <returns>The argument that will act as the context for the content.</returns>
-        public string GetContextArgument()
-        {
-            TagParameter parameter = _definition.GetChildContextParameter();
-            if (parameter == null)
-            {
-                return null;
-            }
-            return _arguments.GetKey(parameter);
-        }
-
         /// <summary>
         /// Adds the given generator. 
         /// </summary>

mustache-sharp/ConditionTagDefinition.cs

@@ -90,12 +90,12 @@ namespace mustache
         }
 
         /// <summary>
-        /// Gets the parameter that is used to create a new child context.
+        /// Gets the parameters that are used to create a new child context.
         /// </summary>
-        /// <returns>The parameter that is used to create a new child context.</returns>
-        public override TagParameter GetChildContextParameter()
+        /// <returns>The parameters that are used to create a new child context.</returns>
+        public override IEnumerable<TagParameter> GetChildContextParameters()
         {
-            return null;
+            return new TagParameter[0];
         }
     }
 }

mustache-sharp/Context.cs

@@ -10,22 +10,22 @@ namespace mustache
         /// <summary>
         /// Initializes a new instance of a Context.
         /// </summary>
-        /// <param name="definition">The definition of tag that created the context.</param>
+        /// <param name="tagName">The name of the tag that created the context.</param>
         /// <param name="argument">The argument used to create the context.</param>
-        internal Context(TagDefinition definition, string argument)
+        internal Context(string tagName, ContextParameter[] parameters)
         {
-            Tag = definition;
-            Argument = argument;
+            TagName = tagName;
+            Parameters = parameters;
         }
 
         /// <summary>
         /// Gets the tag that created the context.
         /// </summary>
-        public TagDefinition Tag { get; private set; }
+        public string TagName { get; private set; }
 
         /// <summary>
         /// Gets the argument used to create the context.
         /// </summary>
-        public string Argument { get; private set; }
+        public ContextParameter[] Parameters { get; private set; }
     }
 }

mustache-sharp/ContextParameter.cs

@@ -0,0 +1,31 @@
+using System;
+
+namespace mustache
+{
+    /// <summary>
+    /// Holds information describing a parameter that creates a new context.
+    /// </summary>
+    public sealed class ContextParameter
+    {
+        /// <summary>
+        /// Initializes a new instance of a ContextParameter.
+        /// </summary>
+        /// <param name="parameter">The parameter that is used to create a new context.</param>
+        /// <param name="argument">The key whose corresponding value will be used to create the context.</param>
+        internal ContextParameter(string parameter, string argument)
+        {
+            Parameter = parameter;
+            Argument = argument;
+        }
+
+        /// <summary>
+        /// Gets the parameter that is used to create a new context.
+        /// </summary>
+        public string Parameter { get; private set; }
+
+        /// <summary>
+        /// Gets the key whose corresponding value will be used to create the context.
+        /// </summary>
+        public string Argument { get; private set; }
+    }
+}

mustache-sharp/EachTagDefinition.cs

@@ -70,12 +70,12 @@ namespace mustache
         }
 
         /// <summary>
-        /// Gets the parameter that is used to create a new child context.
+        /// Gets the parameters that are used to create a new child context.
         /// </summary>
-        /// <returns>The parameter that is used to create a new child context.</returns>
-        public override TagParameter GetChildContextParameter()
+        /// <returns>The parameters that are used to create a new child context.</returns>
+        public override IEnumerable<TagParameter> GetChildContextParameters()
         {
-            return collection;
+            return new TagParameter[] { collection };
         }
     }
 }

mustache-sharp/ElseTagDefinition.cs

@@ -33,12 +33,12 @@ namespace mustache
         }
 
         /// <summary>
-        /// Gets the parameter that is used to create a new child context.
+        /// Gets the parameters that are used to create a new child context.
         /// </summary>
-        /// <returns>The parameter that is used to create a new child context.</returns>
-        public override TagParameter GetChildContextParameter()
+        /// <returns>The parameters that are used to create a new child context.</returns>
+        public override IEnumerable<TagParameter> GetChildContextParameters()
         {
-            return null;
+            return new TagParameter[0];
         }
     }
 }

mustache-sharp/FormatCompiler.cs

@@ -74,7 +74,7 @@ namespace mustache
             }
             CompoundGenerator generator = new CompoundGenerator(_masterDefinition, new ArgumentCollection());
             Trimmer trimmer = new Trimmer();
-            List<Context> context = new List<Context>() { new Context(_masterDefinition, "this") };
+            List<Context> context = new List<Context>() { new Context(_masterDefinition.Name, new ContextParameter[0]) };
             int formatIndex = buildCompoundGenerator(_masterDefinition, context, generator, trimmer, format, 0);
             string trailing = format.Substring(formatIndex);
             generator.AddStaticGenerators(trimmer.RecordText(trailing, false, false));
@@ -218,13 +218,19 @@ namespace mustache
                         generator.AddStaticGenerators(trimmer.RecordText(leading, true, false));
                         ArgumentCollection arguments = getArguments(nextDefinition, match);
                         CompoundGenerator compoundGenerator = new CompoundGenerator(nextDefinition, arguments);
-                        string newContext = compoundGenerator.GetContextArgument();
-                        if (newContext != null)
+                        IEnumerable<TagParameter> contextParameters = nextDefinition.GetChildContextParameters();
+                        bool hasContext = contextParameters.Any();
+                        if (hasContext)
                         {
-                            context.Add(new Context(nextDefinition, newContext));
+                            ContextParameter[] parameters = contextParameters.Select(p => new ContextParameter(p.Name, arguments.GetKey(p))).ToArray();
+                            context.Add(new Context(nextDefinition.Name, parameters));
                         }
                         formatIndex = buildCompoundGenerator(nextDefinition, context, compoundGenerator, trimmer, format, formatIndex);
                         generator.AddGenerator(nextDefinition, compoundGenerator);
+                        if (hasContext)
+                        {
+                            context.RemoveAt(context.Count - 1);
+                        }
                     }
                     else
                     {

mustache-sharp/InlineTagDefinition.cs

@@ -38,12 +38,12 @@ namespace mustache
         }
 
         /// <summary>
-        /// Gets the parameter that is used to create a child context.
+        /// Gets the parameters that are used to create a child context.
         /// </summary>
-        /// <returns>The parameter that is used to create a child context.</returns>
-        public override TagParameter GetChildContextParameter()
+        /// <returns>The parameters that are used to create a child context.</returns>
+        public override IEnumerable<TagParameter> GetChildContextParameters()
         {
-            return null;
+            return new TagParameter[0];
         }
     }
 }

mustache-sharp/MasterTagDefinition.cs

@@ -34,12 +34,12 @@ namespace mustache
         }
 
         /// <summary>
-        /// Gets the parameter that is used to create a new child context.
+        /// Gets the parameters that are used to create a new child context.
         /// </summary>
-        /// <returns>The parameter that is used to create a new child context.</returns>
-        public override TagParameter GetChildContextParameter()
+        /// <returns>The parameters that are used to create a new child context.</returns>
+        public override IEnumerable<TagParameter> GetChildContextParameters()
         {
-            return null;
+            return new TagParameter[0];
         }
     }
 }

mustache-sharp/Properties/AssemblyInfo.cs

@@ -34,6 +34,6 @@ using System.Runtime.CompilerServices;
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("0.0.7.0")]
-[assembly: AssemblyFileVersion("0.0.7.0")]
+[assembly: AssemblyVersion("0.0.7.1")]
+[assembly: AssemblyFileVersion("0.0.7.1")]
 [assembly: InternalsVisibleTo("mustache-sharp.test")]

mustache-sharp/TagDefinition.cs

@@ -133,7 +133,7 @@ namespace mustache
         /// Gets the parameter that will be used to create a new child scope.
         /// </summary>
         /// <returns>The parameter that will be used to create a new child scope -or- null if no new scope is created.</returns>
-        public abstract TagParameter GetChildContextParameter();
+        public abstract IEnumerable<TagParameter> GetChildContextParameters();
 
         /// <summary>
         /// Gets the context to use when building the inner text of the tag.

mustache-sharp/WithGenerator.cs

@@ -38,12 +38,12 @@ namespace mustache
         }
 
         /// <summary>
-        /// Gets the parameter that is used to create a new child context.
+        /// Gets the parameters that are used to create a new child context.
         /// </summary>
-        /// <returns>The parameter that is used to create a new child context.</returns>
-        public override TagParameter GetChildContextParameter()
+        /// <returns>The parameters that are used to create a new child context.</returns>
+        public override IEnumerable<TagParameter> GetChildContextParameters()
         {
-            return context;
+            return new TagParameter[] { context };
         }
 
         /// <summary>

mustache-sharp/mustache-sharp.csproj

@@ -39,6 +39,7 @@
     <Compile Include="ConditionTagDefinition.cs" />
     <Compile Include="ContentTagDefinition.cs" />
     <Compile Include="Context.cs" />
+    <Compile Include="ContextParameter.cs" />
     <Compile Include="KeyFoundEventArgs.cs" />
     <Compile Include="InlineTagDefinition.cs" />
     <Compile Include="EachTagDefinition.cs" />