Added backwards compatibility for 1.8.7 String.each returning itself …

…(and 1.9.3 not supporting .each).

Moved for tag tests to their own test model from StandardTagTest.

lib/liquid/tags/for.rb

@@ -75,7 +75,8 @@ def render(context)
       collection = context[@collection_name]
       collection = collection.to_a if collection.is_a?(Range)
 
-      return render_else(context) unless collection.respond_to?(:each) 
+      # 1.8.7 compatibility
+      return render_else(context) unless collection.respond_to?(:each) or collection.is_a?(String)
 
       from = if @attributes['offset'] == 'continue'
         context.registers[:for][@name].to_i
@@ -123,6 +124,10 @@ def slice_collection_using_each(collection, from, to)
       segments = []      
       index = 0      
       yielded = 0
+
+      # 1.8.7 compatibility
+      return [collection] if collection.is_a?(String)
+
       collection.each do |item|         
 
         if to && to <= index

test/liquid/tags/for_tag_test.rb

@@ -0,0 +1,199 @@
+require 'test_helper'
+
+class ForTagTest < Test::Unit::TestCase
+  include Liquid
+
+  def test_for
+    assert_template_result(' yo  yo  yo  yo ','{%for item in array%} yo {%endfor%}','array' => [1,2,3,4])
+    assert_template_result('yoyo','{%for item in array%}yo{%endfor%}','array' => [1,2])
+    assert_template_result(' yo ','{%for item in array%} yo {%endfor%}','array' => [1])
+    assert_template_result('','{%for item in array%}{%endfor%}','array' => [1,2])
+    expected = <<HERE
+
+  yo
+
+  yo
+
+  yo
+
+HERE
+    template = <<HERE
+{%for item in array%}
+  yo
+{%endfor%}
+HERE
+    assert_template_result(expected,template,'array' => [1,2,3])
+  end
+
+  def test_for_reversed
+    assigns = {'array' => [ 1, 2, 3] }
+    assert_template_result('321','{%for item in array reversed %}{{item}}{%endfor%}',assigns)
+  end
+
+  def test_for_with_range
+    assert_template_result(' 1  2  3 ','{%for item in (1..3) %} {{item}} {%endfor%}')
+  end
+
+  def test_for_with_variable
+    assert_template_result(' 1  2  3 ','{%for item in array%} {{item}} {%endfor%}','array' => [1,2,3])
+    assert_template_result('123','{%for item in array%}{{item}}{%endfor%}','array' => [1,2,3])
+    assert_template_result('123','{% for item in array %}{{item}}{% endfor %}','array' => [1,2,3])
+    assert_template_result('abcd','{%for item in array%}{{item}}{%endfor%}','array' => ['a','b','c','d'])
+    assert_template_result('a b c','{%for item in array%}{{item}}{%endfor%}','array' => ['a',' ','b',' ','c'])
+    assert_template_result('abc','{%for item in array%}{{item}}{%endfor%}','array' => ['a','','b','','c'])
+  end
+
+  def test_for_helpers
+    assigns = {'array' => [1,2,3] }
+    assert_template_result(' 1/3  2/3  3/3 ',
+                           '{%for item in array%} {{forloop.index}}/{{forloop.length}} {%endfor%}',
+                           assigns)
+    assert_template_result(' 1  2  3 ', '{%for item in array%} {{forloop.index}} {%endfor%}', assigns)
+    assert_template_result(' 0  1  2 ', '{%for item in array%} {{forloop.index0}} {%endfor%}', assigns)
+    assert_template_result(' 2  1  0 ', '{%for item in array%} {{forloop.rindex0}} {%endfor%}', assigns)
+    assert_template_result(' 3  2  1 ', '{%for item in array%} {{forloop.rindex}} {%endfor%}', assigns)
+    assert_template_result(' true  false  false ', '{%for item in array%} {{forloop.first}} {%endfor%}', assigns)
+    assert_template_result(' false  false  true ', '{%for item in array%} {{forloop.last}} {%endfor%}', assigns)
+  end
+
+  def test_for_and_if
+    assigns = {'array' => [1,2,3] }
+    assert_template_result('+--',
+                           '{%for item in array%}{% if forloop.first %}+{% else %}-{% endif %}{%endfor%}',
+                           assigns)
+  end
+
+  def test_for_else
+    assert_template_result('+++', '{%for item in array%}+{%else%}-{%endfor%}', 'array'=>[1,2,3])
+    assert_template_result('-',   '{%for item in array%}+{%else%}-{%endfor%}', 'array'=>[])
+    assert_template_result('-',   '{%for item in array%}+{%else%}-{%endfor%}', 'array'=>nil)
+  end
+
+  def test_limiting
+    assigns = {'array' => [1,2,3,4,5,6,7,8,9,0]}
+    assert_template_result('12', '{%for i in array limit:2 %}{{ i }}{%endfor%}', assigns)
+    assert_template_result('1234', '{%for i in array limit:4 %}{{ i }}{%endfor%}', assigns)
+    assert_template_result('3456', '{%for i in array limit:4 offset:2 %}{{ i }}{%endfor%}', assigns)
+    assert_template_result('3456', '{%for i in array limit: 4 offset: 2 %}{{ i }}{%endfor%}', assigns)
+  end
+
+  def test_dynamic_variable_limiting
+    assigns = {'array' => [1,2,3,4,5,6,7,8,9,0]}
+    assigns['limit'] = 2
+    assigns['offset'] = 2
+
+    assert_template_result('34', '{%for i in array limit: limit offset: offset %}{{ i }}{%endfor%}', assigns)
+  end
+
+  def test_nested_for
+    assigns = {'array' => [[1,2],[3,4],[5,6]] }
+    assert_template_result('123456', '{%for item in array%}{%for i in item%}{{ i }}{%endfor%}{%endfor%}', assigns)
+  end
+
+  def test_offset_only
+    assigns = {'array' => [1,2,3,4,5,6,7,8,9,0]}
+    assert_template_result('890', '{%for i in array offset:7 %}{{ i }}{%endfor%}', assigns)
+  end
+
+  def test_pause_resume
+    assigns = {'array' => {'items' => [1,2,3,4,5,6,7,8,9,0]}}
+    markup = <<-MKUP
+      {%for i in array.items limit: 3 %}{{i}}{%endfor%}
+      next
+      {%for i in array.items offset:continue limit: 3 %}{{i}}{%endfor%}
+      next
+      {%for i in array.items offset:continue limit: 3 %}{{i}}{%endfor%}
+      MKUP
+    expected = <<-XPCTD
+      123
+      next
+      456
+      next
+      789
+      XPCTD
+    assert_template_result(expected,markup,assigns)
+  end
+
+  def test_pause_resume_limit
+    assigns = {'array' => {'items' => [1,2,3,4,5,6,7,8,9,0]}}
+    markup = <<-MKUP
+      {%for i in array.items limit:3 %}{{i}}{%endfor%}
+      next
+      {%for i in array.items offset:continue limit:3 %}{{i}}{%endfor%}
+      next
+      {%for i in array.items offset:continue limit:1 %}{{i}}{%endfor%}
+      MKUP
+    expected = <<-XPCTD
+      123
+      next
+      456
+      next
+      7
+      XPCTD
+    assert_template_result(expected,markup,assigns)
+  end
+
+  def test_pause_resume_BIG_limit
+    assigns = {'array' => {'items' => [1,2,3,4,5,6,7,8,9,0]}}
+    markup = <<-MKUP
+      {%for i in array.items limit:3 %}{{i}}{%endfor%}
+      next
+      {%for i in array.items offset:continue limit:3 %}{{i}}{%endfor%}
+      next
+      {%for i in array.items offset:continue limit:1000 %}{{i}}{%endfor%}
+      MKUP
+    expected = <<-XPCTD
+      123
+      next
+      456
+      next
+      7890
+      XPCTD
+      assert_template_result(expected,markup,assigns)
+  end
+
+
+  def test_pause_resume_BIG_offset
+    assigns = {'array' => {'items' => [1,2,3,4,5,6,7,8,9,0]}}
+    markup = %q({%for i in array.items limit:3 %}{{i}}{%endfor%}
+      next
+      {%for i in array.items offset:continue limit:3 %}{{i}}{%endfor%}
+      next
+      {%for i in array.items offset:continue limit:3 offset:1000 %}{{i}}{%endfor%})
+    expected = %q(123
+      next
+      456
+      next
+      )
+      assert_template_result(expected,markup,assigns)
+  end
+
+
+  def test_for_tag_string
+    # ruby 1.8.7 "String".each => Enumerator with single "String" element.
+    # ruby 1.9.3 no longer supports .each on String though we mimic 
+    # the functionality for backwards compatibility
+
+    assert_template_result('test string', 
+                '{%for val in string%}{{val}}{%endfor%}', 
+                'string' => "test string")
+
+    assert_template_result('test string', 
+                '{%for val in string limit:1%}{{val}}{%endfor%}', 
+                'string' => "test string")
+
+    fields = %w(name length index index0 rindex rindex0 first last)
+    assert_template_result('val-string-1-1-0-1-0-true-true-test string', 
+                '{%for val in string%}' + 
+                '{{forloop.name}}-' + 
+                '{{forloop.index}}-' + 
+                '{{forloop.length}}-' + 
+                '{{forloop.index0}}-' + 
+                '{{forloop.rindex}}-' + 
+                '{{forloop.rindex0}}-' + 
+                '{{forloop.first}}-' + 
+                '{{forloop.last}}-' + 
+                '{{val}}{%endfor%}', 
+                'string' => "test string")
+  end
+end