module Vizkit::PluginHelper - RDoc Documentation

class_from_string(class_name) click to toggle source

Converts a string into the corresponding class object. @note It is also aware of typelib classes.

@param [String] class_name the name of the class. @return [Class] the corresponding class object or nil

if no class can be found.

# File lib/vizkit/plugin.rb, line 150
def self.class_from_string(class_name)
    return unless class_name
    return class_name unless class_name.respond_to? :to_str

    if class_name.include?("/")
        typekit = begin 
                      Orocos.load_typekit_for(class_name, false)
                  rescue
                      nil
                  end
        if Orocos.registry.include?(class_name)
            Orocos.registry.get class_name
        else
            Vizkit.info "Typelib Type #{class_name} cannot be found"
            nil
        end
    else
        #check if its a ruby const 
        begin
            m = Kernel                
            class_name.split("::").each do |name|
                m = m.const_get(name)
            end
            m
        rescue NameError
            # Converts ruby Typelib Classes to Typelib names
            # to load the typekit and try again
            temp = to_typelib_name(class_name)
            if temp
                class_from_string(temp)
            else
                nil
            end
        end
    end
end

classes(klass,include_super=true) click to toggle source

Generates an array of strings consisting the class and all super class names of the given class object.

@param [Class] klass the class @param [true,false] include_super if false no super class names are included @return [Array<String>] an array of the class and all superclass names

# File lib/vizkit/plugin.rb, line 100
def self.classes(klass,include_super=true)
    return Array.new unless klass && klass.name
    raise ArgumentError, "#{klass} is not a class" unless klass.respond_to? :name
    arry = if include_super && klass.respond_to?(:superclass) && klass.superclass && (klass <=> klass.superclass) != 0
            Array(klass.name) + classes(klass.superclass)
        else
            Array(klass.name)
        end

    # add opaque type if intermediate or m_type
    if Orocos.registry.include?(klass.name) && Orocos.default_loader.intermediate_type?(klass)
        type = Orocos.default_loader.opaque_type_for(klass)
        if type.respond_to? :intermediate
            Array(type.type.name) + arry
        else
            Array(type.name) + arry
        end
    else
        arry
    end
end

map_obj(klass_name,object=nil) click to toggle source

Maps an object to an array of strings

@see ::register_map_obj @param [String] klass_name the class name of the object which can be different from the real class name @param [Object] object the object that will be passed to the code block registered via ::register_map_obj @return [Array<String>] an array of names which can be used to find a plugin able to handle the object

# File lib/vizkit/plugin.rb, line 43
def self.map_obj(klass_name,object=nil)
    return Array.new unless @map_obj
    return Array.new unless klass_name
    if !object
        normalize_obj(klass_name,false)
    else
        return Array.new unless @map_obj.has_key?(klass_name)
        Array(@map_obj[klass_name].call(object))
    end
end

normalize_obj(object,include_super=true) click to toggle source

Normalizes the object to its class names. It is also aware of objects where the class name is replaced by other names like plugins and objects for which a mapping was registered.

@see ::register_map_obj @note This is used to find all strings for these a plugin might be registered @note There will be no BasicObject for ruby1.8. @note all m types are converted to the corresponding opaque type (this will not work if Orocos is not initialized therefore no m types should be used for registering widgets!) @return [Array<String>] an array of names. @example

normalize_obj(123) => ["Fixnum", "Integer", "Numeric", "Object", "BasicObject"]
normalize_obj("/base/samples/frame/Frame") => ["/base/samples/frame/Frame", "Typelib::CompoundType", "Typelib::Type", "Object", "BasicObject"]
normalize_obj(Types.base.samples.frame.Frame) => ["/base/samples/frame/Frame", "Typelib::CompoundType", "Typelib::Type", "Object", "BasicObject"]
normalize_obj(Types.base.samples.frame.Frame.new) => ["/base/samples/frame/Frame", "Typelib::CompoundType", "Typelib::Type", "Object", "BasicObject"]

# File lib/vizkit/plugin.rb, line 70
def self.normalize_obj(object,include_super=true)
    return Array.new unless object
    names = if object.respond_to? :superclass
                classes object,include_super
            elsif object.respond_to? :to_str
                result = normalize_obj(class_from_string(object),include_super)
                result << object if result.empty?
                result
            elsif object.respond_to? :plugin_spec
                klasses = classes(object.class,include_super)
                klasses.shift
                Array(object.plugin_spec.plugin_name) + klasses 
            else
                klasses = classes(object.class,include_super)
                klasses.shift
                if object.is_a? Qt::Object
                    Array(object.class_name) + klasses
                else
                    Array(object.class.name) + klasses 
                end
            end
    (map_obj(names.first,object)+names).compact
end

register_map_obj(*objects,&block) click to toggle source

Registers a code block which will be executed to map objects to an array of strings. This mechanism is used to customize the mapping of objects to searchable strings and goes hand in hand with ::normalize_obj

@see ::normalize_obj @note The code block will be called for the class object and class instances @param [Array<Object>] objects n objects or an array of objects for which the given

code block shall be invoked.

@param [CodeBlock] block the code block @example

PluginHelper.register_map_obj(Float) do |obj|
        ["Mystring1","MyString2"]
end
Plugin.map_obj(123.2) => ["Mystring1","MyString2"]
Plugin.map_obj("Float",123.2) => ["Mystring1","MyString2"]
Plugin.map_obj("Float") => ["Mystring1","MyString2"]
Plugin.map_obj(Float) => ["Mystring1","MyString2"]

# File lib/vizkit/plugin.rb, line 30
def self.register_map_obj(*objects,&block)
    @map_obj ||= Hash.new
    objects.each do |object|
        @map_obj[normalize_obj(object,false).first] = block
    end
end

to_typelib_name(class_name) click to toggle source

Converts a ruby Typelib class name to a Typelib class name. This is needed to load the typekit before converting the string into a corresponding class object.

@param [String] class_name the name of the ruby class @return [String] the name of the typelib class or nil

if the given string does not match a ruby class name of a typelib
class.

@example

to_typelib_name("Types.base.Angle" => "/base/Angle"

# File lib/vizkit/plugin.rb, line 133
def self.to_typelib_name(class_name)
    class_name =~ /^Types(::.*::)(\w*)/
    if $1 && $2 
        temp2 = $2
        temp = $1.gsub(/::/,"/")
        temp.downcase + temp2 
    else
        nil
    end
end