Trim falsy value in array attribute

lib/hamlit/attribute_builder.rb

@@ -17,7 +17,7 @@ module Hamlit
       end
 
       def build_id(*values)
-        values.select { |v| v }.join('_')
+        values.flatten.select { |v| v }.join('_')
       end
 
       def build_class(*values)

test/haml/engine_test.rb

@@ -153,26 +153,33 @@ class EngineTest < Haml::TestCase
   end
 
   def test_class_attr_with_array
-    skip '[INCOMPATIBILITY] Hamlit deletes only boolean attributes'
     assert_equal("<p class='a b'>foo</p>\n", render("%p{:class => %w[a b]} foo")) # basic
     assert_equal("<p class='a b css'>foo</p>\n", render("%p.css{:class => %w[a b]} foo")) # merge with css
     assert_equal("<p class='b css'>foo</p>\n", render("%p.css{:class => %w[css b]} foo")) # merge uniquely
     assert_equal("<p class='a b c d'>foo</p>\n", render("%p{:class => [%w[a b], %w[c d]]} foo")) # flatten
     assert_equal("<p class='a b'>foo</p>\n", render("%p{:class => [:a, :b] } foo")) # stringify
-    assert_equal("<p>foo</p>\n", render("%p{:class => [nil, false] } foo")) # strip falsey
+    # [INCOMPATIBILITY] Hamlit deletes only boolean attributes
+    # assert_equal("<p>foo</p>\n", render("%p{:class => [nil, false] } foo")) # strip falsey
+    assert_equal("<p class=''>foo</p>\n", render("%p{:class => [nil, false] } foo")) # strip falsey
     assert_equal("<p class='a'>foo</p>\n", render("%p{:class => :a} foo")) # single stringify
-    assert_equal("<p>foo</p>\n", render("%p{:class => false} foo")) # single falsey
+    # [INCOMPATIBILITY] Hamlit deletes only boolean attributes
+    # assert_equal("<p>foo</p>\n", render("%p{:class => false} foo")) # single falsey
+    assert_equal("<p class=''>foo</p>\n", render("%p{:class => false} foo")) # single falsey
     assert_equal("<p class='a b html'>foo</p>\n", render("%p(class='html'){:class => %w[a b]} foo")) # html attrs
   end
 
-  def test_id_attr_with_array; skip # array attribute
+  def test_id_attr_with_array
     assert_equal("<p id='a_b'>foo</p>\n", render("%p{:id => %w[a b]} foo")) # basic
     assert_equal("<p id='css_a_b'>foo</p>\n", render("%p#css{:id => %w[a b]} foo")) # merge with css
     assert_equal("<p id='a_b_c_d'>foo</p>\n", render("%p{:id => [%w[a b], %w[c d]]} foo")) # flatten
     assert_equal("<p id='a_b'>foo</p>\n", render("%p{:id => [:a, :b] } foo")) # stringify
-    assert_equal("<p>foo</p>\n", render("%p{:id => [nil, false] } foo")) # strip falsey
+    # [INCOMPATIBILITY] Hamlit deletes only boolean attributes
+    # assert_equal("<p>foo</p>\n", render("%p{:id => [nil, false] } foo")) # strip falsey
+    assert_equal("<p id=''>foo</p>\n", render("%p{:id => [nil, false] } foo")) # strip falsey
     assert_equal("<p id='a'>foo</p>\n", render("%p{:id => :a} foo")) # single stringify
-    assert_equal("<p>foo</p>\n", render("%p{:id => false} foo")) # single falsey
+    # [INCOMPATIBILITY] Hamlit deletes only boolean attributes
+    # assert_equal("<p>foo</p>\n", render("%p{:id => false} foo")) # single falsey
+    assert_equal("<p id=''>foo</p>\n", render("%p{:id => false} foo")) # single falsey
     assert_equal("<p id='html_a_b'>foo</p>\n", render("%p(id='html'){:id => %w[a b]} foo")) # html attrs
   end
 

test/hamlit/engine/attributes_test.rb

@@ -10,10 +10,10 @@ describe Hamlit::Engine do
   it { assert_render(%q|%a{ href: "'\"" }|, %Q|<a href='&#39;&quot;'></a>\n|) }
   it { assert_inline(%Q|%a{ href: '/search?foo=bar&hoge=<fuga>' }|) }
 
-  specify 'id attributes' do
+  describe 'id attributes' do
+    specify 'compatilibity' do
       assert_haml(<<-HAML)
         #a
-      #a{ id: [] }
         #a{ id: nil }
         #a{ id: nil }(id=nil)
         #a{ id: false }
@@ -25,7 +25,6 @@ describe Hamlit::Engine do
         #c{ id: a = 'a' }(id=id)
         - id = 'a'
         #d#c{ id: a = 'b' }(id=id)
-      #d#c{ id: [] }(id=id)
         #d#c{ id: %w[b e] }(id=id)
         - hash = { id: 'a' }
         %div{ hash }
@@ -36,6 +35,18 @@ describe Hamlit::Engine do
       HAML
     end
 
+    specify 'incompatibility' do
+      assert_render(%q|#a{ id: [] }|, %Q|<div id='a'></div>\n|)
+      assert_render(%q|%a{ id: [nil, false] }|, %Q|<a id=''></a>\n|)
+      assert_render(<<-HAML, <<-HTML)
+        - id = 'a'
+        #d#c{ id: [] }(id=id)
+      HAML
+        <div id='c_a'></div>
+      HTML
+    end
+  end
+
   specify 'class attributes' do
     assert_haml(<<-HAML)
       - klass = 'b a'