Class: Nydp::SymbolLookup

Inherits:
Object
  • Object
show all
Extended by:
Helper
Defined in:
lib/nydp/symbol_lookup.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Helper

cons, list, literal?, pair?, sym, sym?

Constructor Details

#initialize(expression) ⇒ SymbolLookup

Returns a new instance of SymbolLookup.



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# File 'lib/nydp/symbol_lookup.rb', line 9

def initialize expression
  @expression = expression
end

Instance Attribute Details

#expression ⇒ Object (readonly)

Returns the value of attribute expression.



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# File 'lib/nydp/symbol_lookup.rb', line 7

def expression
  @expression
end

Class Method Details

.build(name, bindings) ⇒ Object 



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# File 'lib/nydp/symbol_lookup.rb', line 21

def self.build name, bindings
  depth = 0
  while Nydp.NIL.isnt? bindings
    here = bindings.car
    if here.key? name
      return new ContextSymbol.new(depth, name)
    else
      depth += 1
      bindings = bindings.cdr
    end
  end
  new name
end

Instance Method Details

#assign(value, context = nil) ⇒ Object 



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# File 'lib/nydp/symbol_lookup.rb', line 17

def assign value, context=nil
  @expression.assign value, context
end

#execute(vm) ⇒ Object 



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# File 'lib/nydp/symbol_lookup.rb', line 13

def execute vm
  vm.push_arg expression.value vm.peek_context
end

#inspect ⇒ Object 



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# File 'lib/nydp/symbol_lookup.rb', line 39

def inspect
  "#lookup_symbol:#{@expression.inspect}"
end

#to_s ⇒ Object 



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# File 'lib/nydp/symbol_lookup.rb', line 35

def to_s
  "#lookup:#{expression}:"
end