Class: Gloo::Verbs::Eval

Inherits:
Core::Verb show all
Defined in:
lib/gloo/verbs/eval.rb

Constant Summary collapse

KEYWORD = 
'eval'.freeze
KEYWORD_SHORT = 
'noop'.freeze

Constants inherited from Core::Baseo

Core::Baseo::NOT_IMPLEMENTED_ERR

Instance Attribute Summary

Attributes inherited from Core::Verb

#params, #tokens

Attributes inherited from Core::Baseo

#name

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Core::Verb

#display_value, help, inherited, #initialize, #type_display

Methods inherited from Core::Baseo

#initialize, #type_display

Constructor Details

This class inherits a constructor from Gloo::Core::Verb

Class Method Details

.doc_data ⇒ Object

Get the verb's documentation data.



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# File 'lib/gloo/verbs/eval.rb', line 48

def self.doc_data
  {
    :name => KEYWORD,
    :shortcut => KEYWORD_SHORT,
    :description => 'Evaluate an expression and put the result into it.',
    :syntax => [ 'eval {expression}' ],
    :parameters => [
      '{expression} — The expression that will be evaluated. The expression is optional. If not provided, eval will result in true.'
    ],
    :result => 'The result of the expression evaluation is put ' \
      'into it. No other action is performed.',
    :examples => <<~EXAMPLES.strip
      > eval "me"
      > eval "hello " "world"
      > eval 132 * 23
      > eval path.to.num = 1
    EXAMPLES
  }
end

.keyword ⇒ Object

Get the Verb's keyword.



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# File 'lib/gloo/verbs/eval.rb', line 17

def self.keyword
  return KEYWORD
end

.keyword_shortcut ⇒ Object

Get the Verb's keyword shortcut.



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# File 'lib/gloo/verbs/eval.rb', line 24

def self.keyword_shortcut
  return KEYWORD_SHORT
end

Instance Method Details

#run ⇒ Object

Run the verb.



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# File 'lib/gloo/verbs/eval.rb', line 31

def run
  if @tokens.token_count > 1
    expr = Gloo::Expr::Expression.new( @engine, @tokens.params )
    result = expr.evaluate
    @engine.heap.it.set_to result
  else
    @engine.heap.it.set_to true
  end
end