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@@ -9,31 +9,33 @@ H_FILES.map! {|name| name.index('.') ? name : name+".xml"}
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 H_TESTS = H_FILES.map {|arg| Dir[File.join('test/data/filter',arg)]}
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 # test cases are in Python syntax, convert to something that eval will accept
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-def python2ruby(expr, source)
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-  # unicode strings
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-  expr.gsub! " u'", " '"
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-  expr.gsub! ' u"', ' "'
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+class TestCaseConverter
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+  def self.python2ruby(expr, source)
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+    # unicode strings
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+    expr.gsub! " u'", " '"
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+    expr.gsub! ' u"', ' "'
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-  # triple strings
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-  expr.gsub! /"""(.*?)"""/, '%q{\1}'
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+    # triple strings
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+    expr.gsub! /"""(.*?)"""/, '%q{\1}'
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-  # dict to hash
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-  expr.gsub! "': '", "' => '"
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+    # dict to hash
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+    expr.gsub! "': '", "' => '"
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-  # const to variable
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-  expr.gsub! "Items[", "items["
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-  expr.gsub! "Channels[", "channels["
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+    # const to variable
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+    expr.gsub! "Items[", "items["
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+    expr.gsub! "Channels[", "channels["
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-  # true
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-  expr = "true" if expr == "1"
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+    # true
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+    expr = "true" if expr == "1"
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-  # differences in XML/URI serializations
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-  name = source.split('/').last.split('.').first
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-  expr.sub!('"','%22') if name == 'missing_quote_in_attr'
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-  expr.sub! '>', '>' if name == 'tag_in_attr'
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-  expr.gsub!('"', "\\\\'").gsub!('"','"') if name == 'quote_in_attr'
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+    # differences in XML/URI serializations
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+    name = source.split('/').last.split('.').first
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+    expr.sub!('"','%22') if name == 'missing_quote_in_attr'
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+    expr.sub! '>', '>' if name == 'tag_in_attr'
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+    expr.gsub!('"', "\\\\'").gsub!('"','"') if name == 'quote_in_attr'
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-  expr
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+    expr
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+  end
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 end
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 require 'planet/formatter'
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@@ -59,7 +61,7 @@ class HamlTestCase < Test::Unit::TestCase
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       case testdata
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         # for .xml files
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         when /Description:\s*(.*?)\s*Expect:\s*(.*)\s*/
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-          desc = python2ruby($2, file)
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+          desc = TestCaseConverter.python2ruby($2, file)
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           doc = Planet.harvest(file)
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           output = HamlFormatter.new.haml_info(doc)
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           channels = output['channels']
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@@ -67,7 +69,7 @@ class HamlTestCase < Test::Unit::TestCase
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         # for .ini files... any xml will do
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         when /Description:\s*(.*?)\s*; Expect:\s*(.*)\s*/
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-          desc = python2ruby($2, file)
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+          desc = TestCaseConverter.python2ruby($2, file)
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           Planet.config.read file
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           doc = Planet.harvest('test/data/filter/haml/new_channel.xml')
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           output = HamlFormatter.new.haml_info(doc)