Parsing support for :nth-of-type()

spec/oga/css/parser/pseudo_classes/nth_of_type_spec.rb

@@ -0,0 +1,111 @@
+require 'spec_helper'
+
+describe Oga::CSS::Parser do
+  context ':nth-of-type pseudo class' do
+    example 'parse the :nth-of-type(1) pseudo class' do
+      parse_css(':nth-of-type(1)').should == parse_xpath(
+        'descendant-or-self::*[position() = 1]'
+      )
+    end
+
+    example 'parse the :nth-of-type(2n) pseudo class' do
+      parse_css(':nth-of-type(2n)').should == parse_xpath(
+        'descendant-or-self::*[(position() mod 2) = 0]'
+      )
+    end
+
+    example 'parse the :nth-of-type(3n) pseudo class' do
+      parse_css(':nth-of-type(3n)').should == parse_xpath(
+        'descendant-or-self::*[(position() mod 3) = 0]'
+      )
+    end
+
+    example 'parse the :nth-of-type(2n+5) pseudo class' do
+      parse_css(':nth-of-type(2n+5)').should == parse_xpath(
+        'descendant-or-self::*[(position() >= 5) ' \
+          'and (((position() - 5) mod 2) = 0)]'
+      )
+    end
+
+    example 'parse the :nth-of-type(3n+5) pseudo class' do
+      parse_css(':nth-of-type(3n+5)').should == parse_xpath(
+        'descendant-or-self::*[(position() >= 5) ' \
+          'and (((position() - 5) mod 3) = 0)]'
+      )
+    end
+
+    example 'parse the :nth-of-type(2n-5) pseudo class' do
+      parse_css(':nth-of-type(2n-5)').should == parse_xpath(
+        'descendant-or-self::*[(position() >= 1) ' \
+          'and (((position() - 1) mod 2) = 0)]'
+      )
+    end
+
+    example 'parse the :nth-of-type(2n-6) pseudo class' do
+      parse_css(':nth-of-type(2n-6)').should == parse_xpath(
+        'descendant-or-self::*[(position() >= 2) ' \
+          'and (((position() - 2) mod 2) = 0)]'
+      )
+    end
+
+    example 'parse the :nth-of-type(-2n+5) pseudo class' do
+      parse_css(':nth-of-type(-2n+5)').should == parse_xpath(
+        'descendant-or-self::*[(position() <= 5) ' \
+          'and ((position() - 5) mod 2) = 0]'
+      )
+    end
+
+    example 'parse the :nth-of-type(-2n-5) pseudo class' do
+      parse_css(':nth-of-type(-2n-5)').should == parse_xpath(
+        'descendant-or-self::*[(position() <= -1) ' \
+          'and ((position() - -1) mod 2) = 0]'
+      )
+    end
+
+    example 'parse the :nth-of-type(-2n-6) pseudo class' do
+      parse_css(':nth-of-type(-2n-6)').should == parse_xpath(
+        'descendant-or-self::*[(position() <= -2) ' \
+          'and ((position() - -2) mod 2) = 0]'
+      )
+    end
+
+    example 'parse the :nth-of-type(even) pseudo class' do
+      parse_css(':nth-of-type(even)').should == parse_xpath(
+        'descendant-or-self::*[(position() mod 2) = 0]'
+      )
+    end
+
+    example 'parse the :nth-of-type(odd) pseudo class' do
+      parse_css(':nth-of-type(odd)').should == parse_xpath(
+        'descendant-or-self::*[(position() >= 1) ' \
+          'and (((position() - 1) mod 2) = 0)]'
+      )
+    end
+
+    example 'parse the :nth-of-type(n) pseudo class' do
+      parse_css(':nth-of-type(n)').should == parse_xpath(
+        'descendant-or-self::*[(position() mod 1) =0]'
+      )
+    end
+
+    example 'parse the :nth-of-type(n+5) pseudo class' do
+      parse_css(':nth-of-type(n+5)').should == parse_xpath(
+        'descendant-or-self::*[position() >= 5 ' \
+          'and ((position() - 5) mod 1) = 0]'
+      )
+    end
+
+    example 'parse the :nth-of-type(-n) pseudo class' do
+      parse_css(':nth-of-type(-n)').should == parse_xpath(
+        'descendant-or-self::*[(position() mod 1) = 0]'
+      )
+    end
+
+    example 'parse the :nth-of-type(-n+5) pseudo class' do
+      parse_css(':nth-of-type(-n+5)').should == parse_xpath(
+        'descendant-or-self::*[(position() <= 5) ' \
+          'and ((position() - 5) mod 1) = 0]'
+      )
+    end
+  end
+end