feat: Change attribute value escaper (#84)

spec/blueprint/html/safety_spec.cr

@@ -65,7 +65,7 @@ describe "safety" do
   it "escapes attribute values" do
     page = Example.new
     expected_html = normalize_html <<-HTML
-      <div class="some-class&quot; onblur=&quot;alert(&#39;Attribute&#39;)"></div>
+      <div class="some-class&quot; onblur=&quot;alert('Attribute')"></div>
     HTML
 
     page.to_s.should contain(expected_html)
@@ -92,7 +92,7 @@ describe "safety" do
   it "escapes custom tag content passed via block" do
     page = Example.new
     expected_html = normalize_html <<-HTML
-      <v-btn class="some-class&quot; onclick=&quot;alert(&#39;Attribute&#39;)">&lt;script&gt;alert(&#39;hello&#39;)&lt;/script&gt;</v-btn>
+      <v-btn class="some-class&quot; onclick=&quot;alert('Attribute')">&lt;script&gt;alert(&#39;hello&#39;)&lt;/script&gt;</v-btn>
     HTML
 
     page.to_s.should contain(expected_html)

src/blueprint/html/attributes_handler.cr

@@ -5,47 +5,63 @@ module Blueprint::HTML::AttributesHandler
     end
   end
 
-  private def append_attribute(attribute_name, attribute_value) : Nil
-    case attribute_value
+  private def append_attribute(name, value) : Nil
+    case value
     when Nil, false
       # does nothing
     when true
-      append_boolean_attribute(attribute_name)
+      append_boolean_attribute(name)
     when NamedTuple
-      process_named_tuple_attribute(attribute_name, attribute_value)
+      process_named_tuple_attribute(name, value)
     when Array
-      append_array_attribute(attribute_name, attribute_value)
+      append_array_attribute(name, value)
     else
-      append_normal_attribute(attribute_name, attribute_value)
+      append_normal_attribute(name, value)
     end
   end
 
-  private def append_normal_attribute(attribute_name, attribute_value) : Nil
+  private def append_boolean_attribute(name) : Nil
     @buffer << " "
-    @buffer << parse_attribute_name(attribute_name)
+    @buffer << parse_name(name)
+  end
+
+  private def append_array_attribute(name, value : Array) : Nil
+    append_normal_attribute(name, value.flatten.compact.join(" "))
+  end
+
+  private def process_named_tuple_attribute(name, value : NamedTuple) : Nil
+    name_prefix = parse_name(name)
+
+    value.each do |attr_name, attr_value|
+      append_attribute("#{name_prefix}-#{parse_name(attr_name)}", attr_value)
+    end
+  end
+
+  private def append_normal_attribute(name, value) : Nil
+    @buffer << " "
+    @buffer << parse_name(name)
     @buffer << %(=")
-    append_to_buffer(attribute_value)
+    append_attribute_value(value)
     @buffer << %(")
   end
 
-  private def append_boolean_attribute(attribute_name) : Nil
-    @buffer << " "
-    @buffer << parse_attribute_name(attribute_name)
+  private def append_attribute_value(value : String) : Nil
+    @buffer << value.gsub('"', "&quot;")
   end
 
-  private def append_array_attribute(attribute_name, attribute_value : Array) : Nil
-    append_normal_attribute(attribute_name, attribute_value.flatten.compact.join(" "))
+  private def append_attribute_value(value : SafeObject) : Nil
+    value.to_s @buffer
   end
 
-  private def process_named_tuple_attribute(attribute_name, attribute_value : NamedTuple) : Nil
-    attribute_name_prefix = parse_attribute_name(attribute_name)
+  private def append_attribute_value(value : Number) : Nil
+    value.to_s @buffer
+  end
 
-    attribute_value.each do |name, value|
-      append_attribute("#{attribute_name_prefix}-#{parse_attribute_name(name)}", value)
-    end
+  private def append_attribute_value(value) : Nil
+    append_attribute_value value.to_s
   end
 
-  private def parse_attribute_name(attribute_name) : String
-    attribute_name.to_s.gsub("_", "-")
+  private def parse_name(name) : String
+    name.to_s.gsub("_", "-")
   end
 end

src/blueprint/html/buffer_appender.cr

@@ -1,6 +1,6 @@
 module Blueprint::HTML::BufferAppender
   private def append_to_buffer(content : String)
-    ::HTML.escape(content, @buffer)
+    escape(content, @buffer)
   end
 
   private def append_to_buffer(content : SafeObject)
@@ -11,6 +11,10 @@ module Blueprint::HTML::BufferAppender
   end
 
   private def append_to_buffer(content)
-    ::HTML.escape(content.to_s, @buffer)
+    escape(content.to_s, @buffer)
+  end
+
+  private def escape(value : String, io : IO)
+    ::HTML.escape(value, io)
   end
 end

src/blueprint/html/utils.cr

@@ -17,7 +17,7 @@ module Blueprint::HTML::Utils
     @buffer << " "
   end
 
-  def raw(content : SafeObject) : Nil
+  private def raw(content : SafeObject) : Nil
     append_to_buffer(content)
   end
 end