Class: Verneuil::Scope

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

Overview

The execution scope for verneuil code. This maintains a link to the external context given when starting the process to be able to delegate method calls to user code.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(context, local_vars = {}, parent = nil) ⇒ Scope

Returns a new instance of Scope.



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# File 'lib/verneuil/scope.rb', line 9

def initialize(context, local_vars={}, parent=nil)
  @local_vars = local_vars
  @context = context
  @parent = parent
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



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

def context
  @context
end

Instance Method Details

#defined?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/verneuil/scope.rb', line 30

def defined?(name)
  return 'local-variable' if lvar_exist?(name)
  return 'method' if context.respond_to?(name)
  nil
end

#enter ⇒ Object 



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# File 'lib/verneuil/scope.rb', line 15

def enter
  Verneuil::Scope.new(context, {}, nil)
end

#inspect ⇒ Object 



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# File 'lib/verneuil/scope.rb', line 40

def inspect
  "scope(#{@local_vars.inspect[2..-2]})" + 
    (@parent ? "-> #{@parent.inspect}" : '')
end

#lvar_exist?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/verneuil/scope.rb', line 19

def lvar_exist?(name)
  @local_vars.has_key?(name)
end

#lvar_get(name) ⇒ Object

Raises:



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# File 'lib/verneuil/scope.rb', line 22

def lvar_get(name)
  raise Verneuil::NameError, "No such local variable #{name.inspect}." \
    unless @local_vars.has_key?(name)
  @local_vars[name]
end

#lvar_set(name, value) ⇒ Object 



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# File 'lib/verneuil/scope.rb', line 27

def lvar_set(name, value)
  @local_vars[name] = value
end

#method_call(name, *args) ⇒ Object 



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# File 'lib/verneuil/scope.rb', line 36

def method_call(name, *args)
  context.send(name, *args)
end