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