From aaea48fe9826b9e5d2d5b92795a297b8f238c58d Mon Sep 17 00:00:00 2001
From: Leon Breedt <bitserf@gmail.com>
Date: Sat, 2 Apr 2005 21:03:36 +0000
Subject: * collapse 'ws' back into protocols, it just added complexity and
 indirection, and was hard to extend. * extract casting into seperate support
 file * ensure casting always does the right thing for return values, should
 fix interoperability issues with Ecto and possibly other XML-RPC clients *
 add functional unit tests for scaffolding * represent signature items with
 classes instead of symbols/Class objects, much more flexible * tweak logging
 to always show casted versions of parameters and return values, if possible.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1072 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 .../action_web_service/support/signature_types.rb  | 191 +++++++++++++++++++++
 1 file changed, 191 insertions(+)
 create mode 100644 actionwebservice/lib/action_web_service/support/signature_types.rb

(limited to 'actionwebservice/lib/action_web_service/support')

diff --git a/actionwebservice/lib/action_web_service/support/signature_types.rb b/actionwebservice/lib/action_web_service/support/signature_types.rb
new file mode 100644
index 0000000000..5c57254bc3
--- /dev/null
+++ b/actionwebservice/lib/action_web_service/support/signature_types.rb
@@ -0,0 +1,191 @@
+module ActionWebService # :nodoc:
+  module SignatureTypes # :nodoc:
+    def canonical_signature(signature)
+      return nil if signature.nil?
+      i = -1
+      signature.map{ |spec| canonical_signature_entry(spec, i += 1) }
+    end
+
+    def canonical_signature_entry(spec, i)
+      name = "param#{i}"
+      if spec.is_a?(Hash)
+        name = spec.keys.first
+        spec = spec.values.first
+        type = spec
+      else
+        type = spec
+      end
+      if spec.is_a?(Array)
+        ArrayType.new(canonical_signature_entry(spec[0], 0), name)
+      else
+        type = canonical_type(type)
+        if type.is_a?(Symbol)
+          BaseType.new(type, name)
+        else
+          StructuredType.new(type, name)
+        end
+      end
+    end
+
+    def canonical_type(type)
+      type_name = symbol_name(type) || class_to_type_name(type)
+      type = type_name || type
+      return canonical_type_name(type) if type.is_a?(Symbol)
+      type
+    end
+
+    def canonical_type_name(name)
+      name = name.to_sym
+      case name
+        when :int, :integer, :fixnum, :bignum
+          :int
+        when :string, :base64
+          :string
+        when :bool, :boolean
+          :bool
+        when :float, :double
+          :float
+        when :time, :timestamp
+          :time
+        when :datetime
+          :datetime
+        when :date
+          :date
+        else
+          raise(TypeError, "#{name} is not a valid base type")
+      end
+    end
+
+    def canonical_type_class(type)
+      type = canonical_type(type)
+      type.is_a?(Symbol) ? type_name_to_class(type) : type
+    end
+
+    def symbol_name(name)
+      return name.to_sym if name.is_a?(Symbol) || name.is_a?(String)
+      nil
+    end
+
+    def class_to_type_name(klass)
+      klass = klass.class unless klass.is_a?(Class)
+      if derived_from?(Integer, klass) || derived_from?(Fixnum, klass) || derived_from?(Bignum, klass)
+        :int
+      elsif klass == String
+        :string
+      elsif klass == TrueClass || klass == FalseClass
+        :bool
+      elsif derived_from?(Float, klass) || derived_from?(Precision, klass) || derived_from?(Numeric, klass)
+        :float
+      elsif klass == Time
+        :time
+      elsif klass == DateTime
+        :datetime
+      elsif klass == Date
+        :date
+      else
+        nil
+      end
+    end
+
+    def type_name_to_class(name)
+      case canonical_type_name(name)
+      when :int
+        Integer
+      when :string
+        String
+      when :bool
+        TrueClass
+      when :float
+        Float
+      when :time
+        Time
+      when :date
+        Date
+      when :datetime
+        DateTime
+      else
+        nil
+      end
+    end
+
+    def derived_from?(ancestor, child)
+      child.ancestors.include?(ancestor)
+    end
+
+    module_function :type_name_to_class
+    module_function :class_to_type_name
+    module_function :symbol_name
+    module_function :canonical_type_class
+    module_function :canonical_type_name
+    module_function :canonical_type
+    module_function :canonical_signature_entry
+    module_function :canonical_signature
+    module_function :derived_from?
+  end
+
+  class BaseType # :nodoc:
+    include SignatureTypes
+
+    attr :type
+    attr :type_class
+    attr :name
+
+    def initialize(type, name)
+      @type = canonical_type(type)
+      @type_class = canonical_type_class(@type)
+      @name = name
+    end
+
+    def custom?
+      false
+    end
+
+    def array?
+      false
+    end
+
+    def structured?
+      false
+    end
+  end
+
+  class ArrayType < BaseType # :nodoc:
+    attr :element_type
+
+    def initialize(element_type, name)
+      super(Array, name)
+      @element_type = element_type
+    end
+
+    def custom?
+      true
+    end
+
+    def array?
+      true
+    end
+  end
+
+  class StructuredType < BaseType # :nodoc:
+    def each_member
+      if @type_class.respond_to?(:members)
+        @type_class.members.each do |name, type|
+          yield name, type
+        end
+      elsif @type_class.respond_to?(:columns)
+        i = 0
+        @type_class.columns.each do |column|
+          yield column.name, canonical_signature_entry(column.klass, i += 1)
+        end
+      end
+    end
+
+    def custom?
+      true
+    end
+
+    def structured?
+      true
+    end
+  end
+end
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