class Temple::Filters::ControlFlow

@api public
This is useful for ruby code generation with lots of conditionals.
and [:block, code, content] expressions.
Control flow filter which processes [:if, condition, yes-exp, no-exp]

def on_block(code, exp)

def on_block(code, exp)
  [:multi,
   [:code, code],
   compile(exp),
   [:code, 'end']]
end

def on_case(arg, *cases)

def on_case(arg, *cases)
  result = [:multi, [:code, arg ? "case (#{arg})" : 'case']]
  cases.map do |c|
    condition, exp = c
    result << [:code, condition == :else ? 'else' : "when #{condition}"] << compile(exp)
  end
  result << [:code, 'end']
  result
end

def on_cond(*cases)

def on_cond(*cases)
  on_case(nil, *cases)
end

def on_if(condition, yes, no = nil)

def on_if(condition, yes, no = nil)
  result = [:multi, [:code, "if #{condition}"], compile(yes)]
  while no && no.first == :if
    result << [:code, "elsif #{no[1]}"] << compile(no[2])
    no = no[3]
  end
  result << [:code, 'else'] << compile(no) if no
  result << [:code, 'end']
  result
end