Change inline snippet identifier from string to variable

Currently, snippet files identified by strings. This
PR makes changes to render to allow for new inline
snippets to use variables as identifiers instead

test/integration/tags/snippet_test.rb

@@ -22,7 +22,7 @@ class SnippetTest < Minitest::Test
       Hey
       {% endsnippet %}
 
-      {%- render "hey" -%}
+      {%- render hey -%}
     LIQUID
     expected = <<~OUTPUT
 
@@ -32,6 +32,22 @@ class SnippetTest < Minitest::Test
     assert_template_result(expected, template)
   end
 
+  def test_render_inline_snippet_with_variable
+    template = <<~LIQUID.strip
+      {% snippet hey %}
+      <p>Today is {{ "hello" | capitalize }}</p>
+      {% endsnippet %}
+
+      {%- render hey -%}
+    LIQUID
+    expected = <<~OUTPUT
+
+      <p>Today is Hello</p>
+    OUTPUT
+
+    assert_template_result(expected, template)
+  end
+
   def test_render_multiple_inline_snippets
     template = <<~LIQUID.strip
       {% snippet input %}
@@ -44,8 +60,8 @@ class SnippetTest < Minitest::Test
       </marquee>
       {% endsnippet %}
 
-      {%- render "input" -%}
-      {%- render "banner" -%}
+      {%- render input -%}
+      {%- render banner -%}
     LIQUID
     expected = <<~OUTPUT
 
@@ -67,7 +83,7 @@ class SnippetTest < Minitest::Test
       <input type="{{ type }}" />
       {% endsnippet %}
 
-      {%- render "input", type: "text" -%}
+      {%- render input, type: "text" -%}
     LIQUID
     expected = <<~OUTPUT
 
@@ -87,7 +103,7 @@ class SnippetTest < Minitest::Test
       <input type="{{ type }}" />
       {% endsnippet %}
 
-      {%- render "input", type: "text" -%}
+      {%- render input, type: "text" -%}
     LIQUID
     expected = <<~OUTPUT
 
@@ -110,7 +126,7 @@ class SnippetTest < Minitest::Test
       <input type="{{ type }}" value="{{ value }}" />
       {% endsnippet %}
 
-      {%- render "input", type: "text", value: "Hello" -%}
+      {%- render input, type: "text", value: "Hello" -%}
     LIQUID
     expected = <<~OUTPUT
 
@@ -132,8 +148,8 @@ class SnippetTest < Minitest::Test
       <input type="{{ type }}" value="{{ value }}" />
       {% endsnippet %}
 
-      {%- render "input", type: "text" -%}
-      {%- render "inputs", type: "password", value: "pass" -%}
+      {%- render input, type: "text" -%}
+      {%- render inputs, type: "password", value: "pass" -%}
     LIQUID
 
     expected = <<~OUTPUT
@@ -159,7 +175,7 @@ class SnippetTest < Minitest::Test
       <input type="{{ type }}" value="{{ value }}" />
       {% endsnippet %}
 
-      {%- render "input", type: "text" -%}
+      {%- render input, type: "text" -%}
     LIQUID
     expected = <<~OUTPUT
 
@@ -182,7 +198,7 @@ class SnippetTest < Minitest::Test
       <input type="{{ type }}" value="{{ value }}" />
       {% endsnippet %}
 
-      {%- render "input", type: "text", value: "Hello" -%}
+      {%- render input, type: "text", value: "Hello" -%}
 
       {{ type }}
       {{ value }}
@@ -212,8 +228,8 @@ class SnippetTest < Minitest::Test
       <input type="{{ type }}" />
       {% endsnippet %}
 
-      {%- render "input", type: "text" -%}
-      {%- render "no_leak" -%}
+      {%- render input, type: "text" -%}
+      {%- render no_leak -%}
     LIQUID
     expected = <<~OUTPUT
 
@@ -240,7 +256,7 @@ class SnippetTest < Minitest::Test
       {% endsnippet %}
 
 
-      {% render "header", message: 'Welcome!' %}
+      {% render header, message: 'Welcome!' %}
     LIQUID
     expected = <<~OUTPUT
 
@@ -268,7 +284,7 @@ class SnippetTest < Minitest::Test
       {% endsnippet %}
 
 
-      {% render "header", ..., message: 'Welcome!' %}
+      {% render header, ..., message: 'Welcome!' %}
     LIQUID
     expected = <<~OUTPUT
 
@@ -298,7 +314,7 @@ class SnippetTest < Minitest::Test
 
       {{ color_scheme }}
 
-      {% render "header", ..., message: 'Welcome!' %}
+      {% render header, ..., message: 'Welcome!' %}
 
       {{ color_scheme }}
     LIQUID
@@ -333,7 +349,7 @@ class SnippetTest < Minitest::Test
       {% endsnippet %}
 
       {% capture up_header %}
-        {% render "header", ..., message: 'Welcome!' %}
+        {% render header, ..., message: 'Welcome!' %}
       {% endcapture %}
 
       {{ up_header | upcase }}
@@ -351,7 +367,6 @@ class SnippetTest < Minitest::Test
 
 
 
-
         <DIV CLASS="HEADER HEADER--DARK">
           WELCOME!
         </DIV>
@@ -380,11 +395,11 @@ class SnippetTest < Minitest::Test
       {% assign color_scheme = 'auto' %}
 
       <div class="main main--{{ color_scheme }}">
-        {% render "header", ..., message: 'Welcome!' %}
+        {% render header, ..., message: 'Welcome!' %}
       </div>
       {% endsnippet %}
 
-      {% render "main", header: header %}
+      {% render main, header: header %}
     LIQUID
 
     expected = <<~OUTPUT
@@ -397,7 +412,6 @@ class SnippetTest < Minitest::Test
 
 
 
-
       <div class="main main--auto">
 
         <div class="header header--auto">
@@ -423,7 +437,7 @@ class SnippetTest < Minitest::Test
   #     {% endsnippet %}
   #     {% endfor %}
 
-  #     {% render "header", ..., message: '👉' %}
+  #     {% render header, ..., message: '👉' %}
   #   LIQUID
   #   expected = <<~OUTPUT