Class: LtdTemplate::Code::Subscript

Inherits:
LtdTemplate::Code show all
Defined in:
lib/ltdtemplate/code/subscript.rb

Instance Method Summary collapse

Methods inherited from LtdTemplate::Code

#inspect, #rubyversed

Constructor Details

#initialize(template, base, subscripts) ⇒ Subscript

Returns a new instance of Subscript.



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# File 'lib/ltdtemplate/code/subscript.rb', line 13

def initialize (template, base, subscripts)
  super template
  @base, @subscripts = base, subscripts
end

Instance Method Details

#do_set(opts) ⇒ Object

Implement = and ?=



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# File 'lib/ltdtemplate/code/subscript.rb', line 69

def do_set (opts)
  subscripts = evaluate_subscripts true
  if subscripts.empty?
 # Treat expression[] as expression
 rubyversed(@base).evaluate opts
  elsif opts[:method] != '?=' ||
    rubyversed(@base).evaluate.in_rubyverse(@template)[*subscripts,
    {}].nil?
 # Assign if unconditional or unset
 params = opts[:parameters]
 params = params[0] if params.is_a? LtdTemplate::Univalue
 rubyversed(@base).evaluate.in_rubyverse(@template)[*subscripts,
   {}] = params
  end
  nil
end

#evaluate(opts = {}) ⇒ Object

Evaluate the target’s value.



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# File 'lib/ltdtemplate/code/subscript.rb', line 21

def evaluate (opts = {})
  case opts[:method]
  when '=', '?=' then do_set opts # Support array assignment
  else rubyversed(target(true)).evaluate opts
  end
end

#evaluate_subscripts(meter = false) ⇒ Object

Return subscripts calculated from the supplied code blocks.



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# File 'lib/ltdtemplate/code/subscript.rb', line 31

def evaluate_subscripts (meter = false)
  subscripts = []
  @subscripts.each do |code|
 subscript = rubyversed(code).evaluate
 case subscript
 when LtdTemplate::Value::Array_Splat
    if meter && (size = subscript.positional.size) > 1
  # RESOURCE subscripts: Total number of subscripts
  # RESOURCE subscript_depth: Deepest subscript depth
  @template.use :subscripts, size - 1
  @template.using :subscript_depth, size
    end
    subscripts.concat subscript.positional
 when Numeric, String then subscripts << subscript
 end
  end

  if meter
 @template.use :subscripts, @subscripts.size
 @template.using :subscript_depth, subscripts.size
  end

  subscripts
end

#target(meter = false) ⇒ Object

Return the target value, variable[sub1, …, subN]



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# File 'lib/ltdtemplate/code/subscript.rb', line 59

def target (meter = false)
  subscripts = evaluate_subscripts meter
  if subscripts.empty? then rubyversed(@base).evaluate
  else rubyversed(@base).evaluate.in_rubyverse(@template)[*subscripts, {}]
  end
end