Class: NScript::Scope

Inherits:
Object
  • Object
show all
Defined in:
lib/nscript/scope.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(parent, expressions, function) ⇒ Scope

Returns a new instance of Scope.



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# File 'lib/nscript/scope.rb', line 7

def initialize(parent, expressions, function)
  @parent, @expressions, @function = parent, expressions, function
  @variables = {}
  @temp_variable = @parent ? @parent.temp_variable.dup : '__a'
end

Instance Attribute Details

#expressions ⇒ Object (readonly)

Returns the value of attribute expressions.



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# File 'lib/nscript/scope.rb', line 5

def expressions
  @expressions
end

#function ⇒ Object (readonly)

Returns the value of attribute function.



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# File 'lib/nscript/scope.rb', line 5

def function
  @function
end

#parent ⇒ Object (readonly)

Returns the value of attribute parent.



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# File 'lib/nscript/scope.rb', line 5

def parent
  @parent
end

#temp_variable ⇒ Object (readonly)

Returns the value of attribute temp_variable.



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# File 'lib/nscript/scope.rb', line 5

def temp_variable
  @temp_variable
end

#variables ⇒ Object (readonly)

Returns the value of attribute variables.



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# File 'lib/nscript/scope.rb', line 5

def variables
  @variables
end

Instance Method Details

#assign(name, value, top = false) ⇒ Object 



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# File 'lib/nscript/scope.rb', line 39

def assign(name, value, top=false)
  return @parent.assign(name, value, top) if top && @parent
  @variables[name.to_sym] = Value.new(value)
end

#assigned_variables ⇒ Object 



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# File 'lib/nscript/scope.rb', line 56

def assigned_variables
  @variables.select {|k, v| v.is_a?(Value) }.sort_by {|pair| pair[0].to_s }
end

#assignments?(body) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/nscript/scope.rb', line 48

def assignments?(body)
  !assigned_variables.empty? && body == @expressions
end

#check(name) ⇒ Object 



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# File 'lib/nscript/scope.rb', line 24

def check(name)
  return true if @variables[name.to_sym]
  !!(@parent && @parent.check(name))
end

#compiled_assignments ⇒ Object 



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# File 'lib/nscript/scope.rb', line 64

def compiled_assignments
  assigned_variables.map {|name, val| "#{name} = #{val}"}.join(', ')
end

#compiled_declarations ⇒ Object 



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# File 'lib/nscript/scope.rb', line 60

def compiled_declarations
  declared_variables.join(', ')
end

#declarations?(body) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/nscript/scope.rb', line 44

def declarations?(body)
  !declared_variables.empty? && body == @expressions
end

#declared_variables ⇒ Object 



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# File 'lib/nscript/scope.rb', line 52

def declared_variables
  @variables.select {|k, v| v == :var }.map {|pair| pair[0].to_s }.sort
end

#find(name, remote = false) ⇒ Object 



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# File 'lib/nscript/scope.rb', line 13

def find(name, remote=false)
  found = check(name)
  return found if found || remote
  @variables[name.to_sym] = :var
  found
end

#free_variable ⇒ Object 



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# File 'lib/nscript/scope.rb', line 33

def free_variable
  @temp_variable.succ! while check(@temp_variable)
  @variables[@temp_variable.to_sym] = :var
  Value.new(@temp_variable.dup)
end

#inspect ⇒ Object 



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# File 'lib/nscript/scope.rb', line 68

def inspect
  "<Scope:#{__id__} #{@variables.inspect}>"
end

#parameter(name) ⇒ Object 



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# File 'lib/nscript/scope.rb', line 20

def parameter(name)
  @variables[name.to_sym] = :param
end

#reset(name) ⇒ Object 



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# File 'lib/nscript/scope.rb', line 29

def reset(name)
  @variables[name.to_sym] = false
end