Inversion::Template::

IfTag class

Superclass Inversion::Template::AttrTag
Included Modules

Inversion ‘if’ tag.

This tag causes a section of the template to be rendered only if its methodchain or attribute is a true value.

Syntax

<?if attr ?>...<?end?>
<?if obj.method ?>...<?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 IfTag.

# File lib/inversion/template/iftag.rb, line 41
def initialize( body, linenum=nil, colnum=nil )
        @inverted = false
        super
end

Public Instance Methods

render( renderstate )

Render the tag’s contents if the condition is true, or any else or elsif sections if the condition isn’t true.

# File lib/inversion/template/iftag.rb, line 52
def render( renderstate )

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

        # Start out with rendering enabled if the tag body evaluates trueishly
        if evaluated_state
                self.log.debug "Initial state was TRUE; enabling rendering"
                renderstate.enable_rendering
        else
                self.log.debug "Initial state was FALSE; disabling rendering"
                renderstate.disable_rendering
        end

        # Set the tag state to track whether or not rendering has been enabled during the
        # 'if' for an 'else' or 'elsif' tag.
        renderstate.with_tag_data( rendering_was_enabled: renderstate.rendering_enabled? ) do
                super
        end

        renderstate.enable_rendering
        return nil
end