Support for Enumerator inputs in the XML lexer.

This fixes #48.

spec/oga/xml/lexer/enumerator_spec.rb

@@ -0,0 +1,28 @@
+require 'spec_helper'
+
+describe Oga::XML::Lexer do
+  context 'Enumerator as input' do
+    before do
+      @enum = Enumerator.new do |yielder|
+        yielder << '<p>foo'
+        yielder << '</p>'
+      end
+    end
+
+    example 'lex a paragraph element' do
+      lex(@enum).should == [
+        [:T_ELEM_START, nil, 1],
+        [:T_ELEM_NAME, 'p', 1],
+        [:T_TEXT, 'foo', 1],
+        [:T_ELEM_END, nil, 1]
+      ]
+    end
+
+    example 'rewind input when resetting the lexer' do
+      lexer = described_class.new(@enum)
+
+      lexer.lex.empty?.should == false
+      lexer.lex.empty?.should == false
+    end
+  end
+end

spec/oga/xml/lexer/io_spec.rb

@@ -2,10 +2,12 @@ require 'spec_helper'
 
 describe Oga::XML::Lexer do
   context 'IO as input' do
-    example 'lex a paragraph element with attributes' do
-      io = StringIO.new("<p class='foo'>\nHello</p>")
+    before do
+      @io = StringIO.new("<p class='foo'>\nHello</p>")
+    end
 
-      lex(io).should == [
+    example 'lex a paragraph element with attributes' do
+      lex(@io).should == [
         [:T_ELEM_START, nil, 1],
         [:T_ELEM_NAME, 'p', 1],
         [:T_ATTR, 'class', 1],
@@ -17,7 +19,7 @@ describe Oga::XML::Lexer do
     end
 
     example 'rewind input when resetting the lexer' do
-      lexer = described_class.new(StringIO.new(('<a>foo</a>')))
+      lexer = described_class.new(@io)
 
       lexer.lex.empty?.should == false
       lexer.lex.empty?.should == false