Inversion::Template::

ElsifTag class

Superclass

Inversion::Template::AttrTag

Inversion ‘elsif’ tag.

This tag adds a conditional logical switch to an IfTag. If the IfTag’s condition was false, but the attribute or methodchain of the elsif is true, start rendering.

Syntax

<?if attr ?>
    ...
<?elsif attr ?>
    ...
<?elsif attr.methodchain ?>
    ...
<?end?>

Attributes

inverted RW: Invert the tag’s renderstate if created with the ‘not’ operator.

Public Class Methods

new( body, linenum=nil, colnum=nil )

Create a new ElsifTag.

# File lib/inversion/template/elsiftag.rb, line 43
def initialize( body, linenum=nil, colnum=nil )
        @inverted = false
        super
end

Public Instance Methods

before_appending( parsestate )

Parsing callback – check to be sure the node tree can have an ‘elsif’ tag appended to it (i.e., it has an opening ‘if’ tag).

# File lib/inversion/template/elsiftag.rb, line 54
def before_appending( parsestate )
        condtag = parsestate.node_stack.reverse.find do |node|
                case node
                when Inversion::Template::IfTag,
                     Inversion::Template::CommentTag
                        break node
                when Inversion::Template::ContainerTag
                        raise Inversion::ParseError, "'%s' tags can't have '%s' clauses" %
                                [ node.tagname.downcase, self.tagname.downcase ]
                end
        end

        unless condtag
                raise Inversion::ParseError, "orphaned '%s' tag" % [ self.tagname.downcase ]
        end
end

before_rendering( renderstate )

Toggle rendering for the elsiftag’s container if rendering hasn’t yet been toggled.

# File lib/inversion/template/elsiftag.rb, line 80
def before_rendering( renderstate )

        evaluated_state = self.evaluate( renderstate )
        evaluated_state = ! evaluated_state if self.inverted

        if renderstate.tag_data[ :rendering_was_enabled ]
                self.log.debug "Rendering was previously enabled; disabling"
                renderstate.disable_rendering
        elsif evaluated_state
                self.log.debug "Rendering was previously disabled, and condition is true; enabling"
                renderstate.tag_data[ :rendering_was_enabled ] = true
                renderstate.enable_rendering
        end

        return nil
end

render( * )

Always render as an empty string.

# File lib/inversion/template/elsiftag.rb, line 73
def render( * )
        nil
end