Class: RLTK::Parser::Environment

Inherits:
Object
  • Object
show all
Defined in:
lib/rltk/parser.rb

Overview

All actions passed to Parser.producation and Parser.clause are evaluated inside an instance of the Environment class or its subclass (which must have the same name).

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Environment

Instantiate a new Environment object.



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# File 'lib/rltk/parser.rb', line 1303

def initialize
  self.reset
end

Instance Attribute Details

#errors ⇒ Array<Object> (readonly)

A list of all objects added using the error method.

Returns:

  • (Array<Object>) 


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# File 'lib/rltk/parser.rb', line 1300

def errors
  @errors
end

#he ⇒ Boolean

Indicates if an error was encountered and handled.

Returns:

  • (Boolean) 


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# File 'lib/rltk/parser.rb', line 1295

def he
  @he
end

Instance Method Details

#error(o) ⇒ void

This method returns an undefined value.

Adds an object to the list of errors.



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# File 'lib/rltk/parser.rb', line 1310

def error(o)
  @errors << o
end

#pos(n) ⇒ StreamPosition

Returns a StreamPosition object for the symbol at location n, indexed from zero.

Parameters:

  • n (Integer) —

    Index for symbol position.

Returns:



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# File 'lib/rltk/parser.rb', line 1320

def pos(n)
  @positions[n]
end

#reset ⇒ void

This method returns an undefined value.

Reset any variables that need to be re-initialized between parse calls.



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# File 'lib/rltk/parser.rb', line 1328

def reset
  @errors  = Array.new
  @he    = false
end

#set_positions(positions) ⇒ Array<StreamPosition>

Setter for the positions array.

Parameters:

Returns:



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# File 'lib/rltk/parser.rb', line 1338

def set_positions(positions)
  @positions = positions
end