1 files changed, 78 insertions, 0 deletions
diff --git a/spec/mspec/lib/mspec/guards/platform.rb b/spec/mspec/lib/mspec/guards/platform.rb
new file mode 100644
index 0000000000..875aef6c9c
--- /dev/null
+++ b/spec/mspec/lib/mspec/guards/platform.rb
@@ -0,0 +1,78 @@
+require 'mspec/guards/guard'
+
+class PlatformGuard < SpecGuard
+  def self.implementation?(*args)
+    args.any? do |name|
+      case name
+      when :rubinius
+        RUBY_NAME.start_with?('rbx')
+      when :ruby, :jruby, :truffleruby, :ironruby, :macruby, :maglev, :topaz, :opal
+        RUBY_NAME.start_with?(name.to_s)
+      else
+        raise "unknown implementation #{name}"
+      end
+    end
+  end
+
+  def self.standard?
+    implementation? :ruby
+  end
+
+  HOST_OS = begin
+    require 'rbconfig'
+    RbConfig::CONFIG['host_os'] || RUBY_PLATFORM
+  rescue LoadError
+    RUBY_PLATFORM
+  end.downcase
+
+  def self.os?(*oses)
+    oses.any? do |os|
+      raise ":java is not a valid OS" if os == :java
+      if os == :windows
+        HOST_OS =~ /(mswin|mingw)/
+      else
+        HOST_OS.include?(os.to_s)
+      end
+    end
+  end
+
+  def self.windows?
+    os?(:windows)
+  end
+
+  def self.wordsize?(size)
+    size == 8 * 1.size
+  end
+
+  def initialize(*args)
+    if args.last.is_a?(Hash)
+      @options, @platforms = args.last, args[0..-2]
+    else
+      @options, @platforms = {}, args
+    end
+    @parameters = args
+  end
+
+  def match?
+    match = @platforms.empty? ? true : PlatformGuard.os?(*@platforms)
+    @options.each do |key, value|
+      case key
+      when :os
+        match &&= PlatformGuard.os?(*value)
+      when :wordsize
+        match &&= PlatformGuard.wordsize? value
+      end
+    end
+    match
+  end
+end
+
+class Object
+  def platform_is(*args, &block)
+    PlatformGuard.new(*args).run_if(:platform_is, &block)
+  end
+
+  def platform_is_not(*args, &block)
+    PlatformGuard.new(*args).run_unless(:platform_is_not, &block)
+  end
+end