Included Modules

Inversion::Template::ElsifTag

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?>

Public Instance Methods

before_appending( parsestate ) click to toggle source

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 31
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
render( renderstate ) click to toggle source

Toggle rendering for the iftag's container if rendering hasn't yet been toggled.

# File lib/inversion/template/elsiftag.rb, line 51
def render( renderstate )
        if renderstate.tag_data[ :rendering_was_enabled ]
                self.log.debug "Rendering was previously enabled; disabling"
                renderstate.disable_rendering
        elsif self.evaluate( renderstate )
                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

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