Add support for Ruby 1.9.x.
Akinori MUSHA
2 changed files with 89 additions and 1 deletions
+ 4
- 1
lib/ar_mysql_column_charset.rb
@@ -1,5 +1,8 @@ |
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require 'active_record' |
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+# Module#prepend support for Ruby 1.9 |
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+require 'prepend' unless Module.method_defined?(:prepend) |
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+ |
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module ActiveRecord::ConnectionAdapters |
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class ColumnDefinition |
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module CharsetSupport |
@@ -77,4 +80,4 @@ module ActiveRecord::ConnectionAdapters |
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prepend CharsetSupport |
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end |
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end |
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-end if Module.method_defined?(:prepend) # ruby >=2.0 |
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+end |
+ 85
- 0
lib/prepend.rb
@@ -0,0 +1,85 @@ |
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+# Fake implementation of prepend(), which does not support overriding |
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+# inherited methods nor methods that are formerly overridden by |
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+# another invocation of prepend(). |
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+# |
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+# Here's what <Original>.prepend(<Wrapper>) does: |
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+# |
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+# - Create an anonymous stub module (hereinafter <Stub>) and define |
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+# <Stub>#<method> that calls #<method>_without_<Wrapper> for each |
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+# instance method of <Wrapper>. |
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+# |
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+# - Rename <Original>#<method> to #<method>_without_<Wrapper> for each |
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+# instance method of <Wrapper>. |
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+# |
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+# - Include <Stub> and <Wrapper> into <Original> in that order. |
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+# |
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+# This way, a call of <Original>#<method> is dispatched to |
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+# <Wrapper><method>, which may call super which is dispatched to |
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+# <Stub>#<method>, which finally calls |
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+# <Original>#<method>_without_<Wrapper> which is used to be called |
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+# <Original>#<method>. |
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+# |
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+# Usage: |
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+# |
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+# class Mechanize |
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+# # module with methods that overrides those of X |
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+# module Y |
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+# end |
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+# |
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+# unless X.respond_to?(:prepend, true) |
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+# require 'mechanize/prependable' |
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+# X.extend(Prependable) |
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+# end |
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+# |
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+# class X |
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+# prepend Y |
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+# end |
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+# end |
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+class Module |
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+ def prepend(mod) |
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+ stub = Module.new |
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+ |
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+ mod_id = (mod.name || 'Module__%d' % mod.object_id).gsub(/::/, '__') |
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+ |
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+ mod.instance_methods.each { |name|
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+ method_defined?(name) or next |
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+ |
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+ original = instance_method(name) |
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+ next if original.owner != self |
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+ |
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+ name = name.to_s |
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+ name_without = name.sub(/(?=[?!=]?\z)/) { '_without_%s' % mod_id }
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+ |
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+ arity = original.arity |
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+ arglist = ( |
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+ if arity >= 0 |
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+ (1..arity).map { |i| 'x%d' % i }
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+ else |
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+ (1..(-arity - 1)).map { |i| 'x%d' % i } << '*a'
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+ end << '&b' |
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+ ).join(', ')
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+ |
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+ if name.end_with?('=')
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+ stub.module_eval %{
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+ def #{name}(#{arglist})
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+ __send__(:#{name_without}, #{arglist})
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+ end |
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+ } |
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+ else |
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+ stub.module_eval %{
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+ def #{name}(#{arglist})
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+ #{name_without}(#{arglist})
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+ end |
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+ } |
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+ end |
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+ module_eval {
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+ alias_method name_without, name |
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+ remove_method name |
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+ } |
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+ } |
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+ |
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+ include stub |
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+ include mod |
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+ end |
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+ private :prepend |
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+end unless Module.method_defined?(:prepend) |