Checkout of Instiki Trunk 1/21/2007.

vendor/plugins/rubyzip-0.9.1/lib/zip/ziprequire.rb

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+# With ziprequire you can load ruby modules from a zip file. This means
+# ruby's module include path can include zip-files.
+#
+# The following example creates a zip file with a single entry 
+# <code>log/simplelog.rb</code> that contains a single function 
+# <code>simpleLog</code>: 
+#
+#   require 'zip/zipfilesystem'
+#   
+#   Zip::ZipFile.open("my.zip", true) {
+#     |zf| 
+#     zf.file.open("log/simplelog.rb", "w") { 
+#       |f|
+#       f.puts "def simpleLog(v)"
+#       f.puts '  Kernel.puts "INFO: #{v}"'
+#       f.puts "end"
+#     }
+#   }
+#
+# To use the ruby module stored in the zip archive simply require
+# <code>zip/ziprequire</code> and include the <code>my.zip</code> zip 
+# file in the module search path. The following command shows one 
+# way to do this:
+#
+#   ruby -rzip/ziprequire -Imy.zip  -e " require 'log/simplelog'; simpleLog 'Hello world' "
+
+#$: << 'data/rubycode.zip' << 'data/rubycode2.zip'
+
+
+require 'zip/zip'
+
+class ZipList #:nodoc:all
+  def initialize(zipFileList)
+      @zipFileList = zipFileList
+  end
+
+  def get_input_stream(entry, &aProc)
+    @zipFileList.each {
+      |zfName|
+      Zip::ZipFile.open(zfName) {
+	|zf|
+	begin
+	  return zf.get_input_stream(entry, &aProc) 
+	rescue Errno::ENOENT
+	end
+      }
+    }
+    raise Errno::ENOENT,
+      "No matching entry found in zip files '#{@zipFileList.join(', ')}' "+
+      " for '#{entry}'"
+  end
+end
+
+
+module Kernel #:nodoc:all
+  alias :oldRequire :require
+
+  def require(moduleName)
+    zip_require(moduleName) || oldRequire(moduleName)
+  end
+
+  def zip_require(moduleName)
+    return false if already_loaded?(moduleName)
+    get_resource(ensure_rb_extension(moduleName)) { 
+      |zis| 
+      eval(zis.read); $" << moduleName 
+    }
+    return true
+  rescue Errno::ENOENT => ex
+    return false
+  end
+
+  def get_resource(resourceName, &aProc)
+    zl = ZipList.new($:.grep(/\.zip$/))
+    zl.get_input_stream(resourceName, &aProc)
+  end
+
+  def already_loaded?(moduleName)
+    moduleRE = Regexp.new("^"+moduleName+"(\.rb|\.so|\.dll|\.o)?$")
+    $".detect { |e| e =~ moduleRE } != nil
+  end
+
+  def ensure_rb_extension(aString)
+    aString.sub(/(\.rb)?$/i, ".rb")
+  end
+end
+
+# Copyright (C) 2002 Thomas Sondergaard
+# rubyzip is free software; you can redistribute it and/or
+# modify it under the terms of the ruby license.