Module: Zafu::Process::Conditional

Defined in:
lib/zafu/process/conditional.rb

Overview

This module manages conditional rendering (if, else, elsif, case, when).

Instance Method Summary collapse

Instance Method Details

#expand_if(condition, new_node_context = self.node, alt_markup = @markup) ⇒ Object

Expand blocks with conditional processing enabled (else, elsif, etc).

Parameters

  • condition - ruby condition for the conditional execution.

  • new_node_context - (optional) new node context to enter if the clause succeeds.

  • alt_markup - (optional) alternative markup to use for the ‘else’, ‘elsif’ clauses.



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# File 'lib/zafu/process/conditional.rb', line 65

def expand_if(condition, new_node_context = self.node, alt_markup = @markup)
  res = ""
  res << "<% if #{condition} %>"
  with_context(:node => new_node_context) do
    res << wrap(expand_with)
  end

  only = method == 'case' ? %r{^[A-Z]|else|elsif|when} : %w{else elsif when}
  res << expand_with(:in_if => true, :only => only, :markup => alt_markup)
  res << "<% end %>"
  res
end

#r_case ⇒ Object 



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# File 'lib/zafu/process/conditional.rb', line 11

def r_case
  r_if('false')
end

#r_else ⇒ Object 



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# File 'lib/zafu/process/conditional.rb', line 15

def r_else
  r_elsif('true')
end

#r_elsif(cond = nil) ⇒ Object 



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# File 'lib/zafu/process/conditional.rb', line 23

def r_elsif(cond = nil)
  return '' unless @context[:in_if]
  cond ||= get_condition
  return unless cond

  res = expand_with(:in_if => false, :markup => nil)

  # We use 'elsif' just in case there are more then one 'else' clause
  if markup = @context[:markup]
    if @markup.tag.blank?
      # Copy markup tag
      @markup.tag = markup.tag
      @markup.steal_html_params_from(@params)
      markup.params.each do |k, v|
        next if @markup.params[k]
        @markup.set_param(k, v)
      end

      markup.dyn_params.each do |k, v|
        next if @markup.params[k] || @markup.dyn_params[k]
        @markup.set_dyn_param(k, v)
      end
      inner = wrap(res)
    else
      markup.done = false
      # Wrap with both markup (ours and the else/elsif clause).
      inner = markup.wrap(wrap(res))
    end
    out "<% elsif #{cond} %>#{inner}" # do not propagate
  else
    #@markup.done = true # never wrap else/elsif clause
    out "<% elsif #{cond} %>#{res}" # do not propagate
  end
end

#r_if(cond = nil) ⇒ Object 



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# File 'lib/zafu/process/conditional.rb', line 5

def r_if(cond = nil)
  cond ||= get_condition
  return unless cond
  expand_if(cond)
end

#r_when ⇒ Object 



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# File 'lib/zafu/process/conditional.rb', line 19

def r_when
  r_elsif
end