Class: Treetop::Runtime::CompiledParser

Inherits:
Object
  • Object
show all
Includes:
Treetop::Runtime
Defined in:
lib/treetop/runtime/compiled_parser.rb

Direct Known Subclasses

Compiler::MetagrammarParser

Constant Summary collapse

OtherThan = 
'something other than '

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ CompiledParser

Returns a new instance of CompiledParser.



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# File 'lib/treetop/runtime/compiled_parser.rb', line 11

def initialize
  self.consume_all_input = true
end

Instance Attribute Details

#consume_all_input ⇒ Object Also known as: consume_all_input?

Returns the value of attribute consume_all_input.



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# File 'lib/treetop/runtime/compiled_parser.rb', line 8

def consume_all_input
  @consume_all_input
end

#index ⇒ Object

Returns the value of attribute index.



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# File 'lib/treetop/runtime/compiled_parser.rb', line 6

def index
  @index
end

#input ⇒ Object (readonly)

Returns the value of attribute input.



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# File 'lib/treetop/runtime/compiled_parser.rb', line 6

def input
  @input
end

#max_terminal_failure_index ⇒ Object (readonly)

Returns the value of attribute max_terminal_failure_index.



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# File 'lib/treetop/runtime/compiled_parser.rb', line 6

def max_terminal_failure_index
  @max_terminal_failure_index
end

#root=(value) ⇒ Object (writeonly)

Sets the attribute root

Parameters:

  • value —

    the value to set the attribute root to.



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# File 'lib/treetop/runtime/compiled_parser.rb', line 7

def root=(value)
  @root = value
end

Instance Method Details

#failure_column ⇒ Object 



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# File 'lib/treetop/runtime/compiled_parser.rb', line 38

def failure_column
  @terminal_failures && input.column_of(failure_index)
end

#failure_index ⇒ Object 



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# File 'lib/treetop/runtime/compiled_parser.rb', line 30

def failure_index
  max_terminal_failure_index
end

#failure_line ⇒ Object 



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# File 'lib/treetop/runtime/compiled_parser.rb', line 34

def failure_line
  @terminal_failures && input.line_of(failure_index)
end

#failure_reason ⇒ Object 



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# File 'lib/treetop/runtime/compiled_parser.rb', line 43

def failure_reason
  return nil unless (tf = terminal_failures) && tf.size > 0
  "Expected " +
    (tf.size == 1 ?
     (tf[0].unexpected ? OtherThan : '')+tf[0].expected_string :
           "one of #{tf.map{|f| (f.unexpected ? OtherThan : '')+f.expected_string}.uniq*', '}"
    ) +
          " at line #{failure_line}, column #{failure_column} (byte #{failure_index+1})" +
          (failure_index > 0 ? " after #{input[index...failure_index]}" : '')
end

#parse(input, options = {}) ⇒ Object 



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# File 'lib/treetop/runtime/compiled_parser.rb', line 15

def parse(input, options = {})
  prepare_to_parse(input)
  @index = options[:index] if options[:index]
  result = send("_nt_#{options[:root] || root}")
  should_consume_all = options.include?(:consume_all_input) ? options[:consume_all_input] : consume_all_input?
	if (should_consume_all && index != input.size)
	  if index > max_terminal_failure_index	# Otherwise the failure is already explained
	    terminal_parse_failure('<END OF INPUT>', true)
	  end
	  return nil
	end
  return SyntaxNode.new(input, index...(index + 1)) if result == true
  return result
end

#terminal_failures ⇒ Object 



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# File 'lib/treetop/runtime/compiled_parser.rb', line 54

def terminal_failures
  if @terminal_failures.empty? || @terminal_failures[0].is_a?(TerminalParseFailure)
    @terminal_failures
  else
    @terminal_failures.map! {|tf_ary| TerminalParseFailure.new(*tf_ary) }
  end
end