CSS eval specs for various pseudo classes.

This includes the following pseudos:

* :empty
* :first-child
* :first-of-type
* :last-child
* :last-of-type

spec/oga/css/evaluator/pseudo_classes/empty_spec.rb

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+require 'spec_helper'
+
+describe 'CSS selector evaluation' do
+  context ':empty pseudo class' do
+    before do
+      @document = parse('<root><a></a><b>foo</b></root>')
+
+      @a1 = @document.children[0].children[0]
+      @b1 = @document.children[0].children[1]
+    end
+
+    example 'return a node set containing empty nodes' do
+      evaluate_css(@document, 'root :empty').should == node_set(@a1)
+    end
+
+    example 'return a node set containing empty nodes with a node test' do
+      evaluate_css(@document, 'root a:empty').should == node_set(@a1)
+    end
+
+    example 'return an empty node set containing non empty nodes' do
+      evaluate_css(@document, 'root b:empty').should == node_set
+    end
+  end
+end

spec/oga/css/evaluator/pseudo_classes/first_child_spec.rb

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+require 'spec_helper'
+
+describe 'CSS selector evaluation' do
+  context ':first-child pseudo class' do
+    before do
+      @document = parse('<root><a /><b /></root>')
+
+      @a1 = @document.children[0].children[0]
+      @b1 = @document.children[0].children[1]
+    end
+
+    example 'return a node set containing the first child node' do
+      evaluate_css(@document, 'root :first-child').should == node_set(@a1)
+    end
+
+    example 'return a node set containing the first child node with a node test' do
+      evaluate_css(@document, 'root a:first-child').should == node_set(@a1)
+    end
+
+    example 'return an empty node set for non first-child nodes' do
+      evaluate_css(@document, 'root b:first-child').should == node_set
+    end
+  end
+end

spec/oga/css/evaluator/pseudo_classes/first_of_type_spec.rb

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+require 'spec_helper'
+
+describe 'CSS selector evaluation' do
+  context ':first-of-type pseudo class' do
+    before do
+      @document = parse('<root><a /><b /></root>')
+
+      @a1 = @document.children[0].children[0]
+      @b1 = @document.children[0].children[1]
+    end
+
+    example 'return a node set containing the first node' do
+      evaluate_css(@document, 'root :first-of-type').should == node_set(@a1)
+    end
+
+    example 'return a node set containing the first node with a node test' do
+      evaluate_css(@document, 'root a:first-of-type').should == node_set(@a1)
+    end
+
+    example 'return a node set containing the first <b> node' do
+      evaluate_css(@document, 'root b:first-of-type').should == node_set(@b1)
+    end
+  end
+end

spec/oga/css/evaluator/pseudo_classes/last_child_spec.rb

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+require 'spec_helper'
+
+describe 'CSS selector evaluation' do
+  context ':last-child pseudo class' do
+    before do
+      @document = parse('<root><a /><b /></root>')
+
+      @a1 = @document.children[0].children[0]
+      @b1 = @document.children[0].children[1]
+    end
+
+    example 'return a node set containing the last child node' do
+      evaluate_css(@document, 'root :last-child').should == node_set(@b1)
+    end
+
+    example 'return a node set containing the last child node with a node test' do
+      evaluate_css(@document, 'root b:last-child').should == node_set(@b1)
+    end
+
+    example 'return an empty node set for non last-child nodes' do
+      evaluate_css(@document, 'root a:last-child').should == node_set
+    end
+  end
+end

spec/oga/css/evaluator/pseudo_classes/last_of_type_spec.rb

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+require 'spec_helper'
+
+describe 'CSS selector evaluation' do
+  context ':last-of-type pseudo class' do
+    before do
+      @document = parse('<root><a /><b /><a /></root>')
+
+      @b1 = @document.children[0].children[1]
+      @a2 = @document.children[0].children[2]
+    end
+
+    example 'return a node set containing the last node' do
+      evaluate_css(@document, 'root :last-of-type').should == node_set(@a2)
+    end
+
+    example 'return a node set containing the last node with a node test' do
+      evaluate_css(@document, 'root b:last-of-type').should == node_set(@b1)
+    end
+
+    example 'return a node set containing the last <a> node' do
+      evaluate_css(@document, 'root a:last-of-type').should == node_set(@a2)
+    end
+  end
+end