Module: Babl::Operators::Switch::DSL

Included in:
Template
Defined in:
lib/babl/operators/switch.rb

Instance Method Summary collapse

Instance Method Details

#continue ⇒ Object

Return a special placeholder that can be used as a switch(…) value. It tells BABL to continue the evaluation of the original chain after switch().



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# File 'lib/babl/operators/switch.rb', line 13

def continue
    construct_terminal { |context|
        node = context[:continue]
        raise Babl::InvalidTemplateError, 'continue() cannot be used outside switch()' unless node
        node
    }
end

#default ⇒ Object

To be used as a switch(…) condition. It is strictly equivalent to write ‘true’ instead, but convey more meaning.



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# File 'lib/babl/operators/switch.rb', line 7

def default
    unscoped.static(true)
end

#switch(conds = {}) ⇒ Object

Conditional switching



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# File 'lib/babl/operators/switch.rb', line 22

def switch(conds = {})
    construct_node(continue: nil) { |node, context|
        nodes = conds.map { |cond, value|
            cond_node = unscoped.call(cond).builder
                .precompile(Rendering::InternalValueNode.instance, context.merge(continue: nil))

            value_node = unscoped.call(value).builder
                .precompile(Rendering::TerminalValueNode.instance, context.merge(continue: node))

            [cond_node, value_node]
        }.to_h

        SwitchNode.new(nodes)
    }
end