Add symbolic attribute to example components

This is used to determine whether a type or method is referenced.

src/spectator/dsl/nested_example_group_builder.cr

@@ -16,7 +16,8 @@ module Spectator::DSL
     # ```
     # The value would be "String" for the describe block
     # and "with an empty string" for the context block.
-    def initialize(@what : String)
+    # Use a `Symbol` when referencing a type name.
+    def initialize(@what : Symbol | String)
     end
 
     # Builds the example group.

src/spectator/dsl/structure_dsl.cr

@@ -271,7 +271,15 @@ module Spectator::DSL
 
         # Start a new group.
         ::Spectator::DSL::Builder.start_group(
-          {{what.is_a?(StringLiteral) ? what : what.stringify}}
+          {% if what.is_a?(StringLiteral) %}
+            {% if what.starts_with?("#") || what.starts_with?(".") %}
+              {{what.id.symbolize}}
+            {% else %}
+              {{what}}
+            {% end %}
+          {% else %}
+            {{what.symbolize}}
+          {% end %}
         )
 
         # Nest the block's content in the module.
@@ -1487,6 +1495,11 @@ module Spectator::DSL
         # Retrieves the underlying, wrapped test code.
         getter instance
 
+        # Indicates whether the example references a method.
+        def symbolic?
+          {{what.starts_with?('#') ? true : false}}
+        end
+
         # Add the block's content if one was provided.
         {% if block.is_a?(Block) %}
           {{block.body}}

src/spectator/dummy_example.cr

@@ -14,6 +14,11 @@ module Spectator
       "DUMMY"
     end
 
+    # Dummy symbolic flag.
+    def symbolic?
+      false
+    end
+
     # Dummy source.
     def source
       Source.new(__FILE__, __LINE__)

src/spectator/example_component.cr

@@ -13,5 +13,8 @@ module Spectator
 
     # Lookup the example with the specified index.
     abstract def [](index : Int) : Example
+
+    # Indicates that the component references a type or method.
+    abstract def symbolic? : Bool
   end
 end

src/spectator/nested_example_group.cr

@@ -5,7 +5,8 @@ module Spectator
   # This group can be nested under other groups.
   class NestedExampleGroup < ExampleGroup
     # Description from the user of the group's contents.
-    getter what : String
+    # This is a symbol when referencing a type.
+    getter what : Symbol | String
 
     # Group that this is nested in.
     getter parent : ExampleGroup
@@ -21,6 +22,11 @@ module Spectator
       super(hooks, conditions)
     end
 
+    # Indicates wheter the group references a type.
+    def symbolic?
+      @what.is_a?(Symbol)
+    end
+
     # Runs all of the `before_all` hooks.
     # This should run prior to any examples in the group.
     # The hooks will be run only once.

src/spectator/root_example_group.cr

@@ -9,6 +9,11 @@ module Spectator
       "ROOT"
     end
 
+    # Indicates that the group is symbolic.
+    def symbolic?
+      true
+    end
+
     # Does nothing.
     # This prevents the root group
     # from showing up in output.