Exception: ANTLR3::Error::RecognitionError

Inherits:
StandardError
  • Object
show all
Includes:
Constants
Defined in:
lib/antlr3/error.rb

Overview

The base class of the variety of syntax errors that can occur during the recognition process. These errors all typically concern an expectation built in to the recognizer by the rules of a grammar and an input symbol which failed to fit the expectation.

Direct Known Subclasses

EarlyExit, FailedPredicate, MismatchedRange, MismatchedSet, MismatchedToken, MismatchedTreeNode, NoViableAlternative

Constant Summary

Constant Summary

Constants included from Constants

Constants::BUILT_IN_TOKEN_NAMES, Constants::DEFAULT, Constants::DOWN, Constants::EOF, Constants::EOF_TOKEN, Constants::EOR_TOKEN_TYPE, Constants::HIDDEN, Constants::INVALID_TOKEN, Constants::INVALID_TOKEN_TYPE, Constants::MEMO_RULE_FAILED, Constants::MEMO_RULE_UNKNOWN, Constants::MIN_TOKEN_TYPE, Constants::SKIP_TOKEN, Constants::UP

Instance Attribute Summary (collapse)

Instance Method Summary (collapse)

Constructor Details

- (RecognitionError) initialize(input = nil)

A new instance of RecognitionError



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# File 'lib/antlr3/error.rb', line 109

def initialize( input = nil )
  @index = @line =  @column = nil
  @approximate_line_info = false
  if @input = input
    @index = input.index
    @source_name = @input.source_name rescue nil
    case @input
    when TokenStream
      @token = @symbol = input.look
      @line   = @symbol.line
      @column = @symbol.column
    when CharacterStream
      @token = @symbol = input.peek || EOF
      @line   = @input.line
      @column = @input.column
    when AST::TreeNodeStream
      @symbol = @input.look
      if @symbol.respond_to?( :line ) and @symbol.respond_to?( :column )
        @line, @column = @symbol.line, @symbol.column
      else
        extract_from_node_stream( @input )
      end
    else
      @symbol = @input.look
      if @symbol.respond_to?( :line ) and @symbol.respond_to?( :column )
        @line, @column = @symbol.line, @symbol.column
      elsif @input.respond_to?( :line ) and @input.respond_to?( :column )
        @line, @column = @input.line, @input.column
      end
    end
  end
  super( message )
end

Instance Attribute Details

- (Object) column

Returns the value of attribute column



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# File 'lib/antlr3/error.rb', line 107

def column
  @column
end

- (Object) index

Returns the value of attribute index



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# File 'lib/antlr3/error.rb', line 107

def index
  @index
end

- (Object) input

Returns the value of attribute input



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# File 'lib/antlr3/error.rb', line 107

def input
  @input
end

- (Object) line

Returns the value of attribute line



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# File 'lib/antlr3/error.rb', line 107

def line
  @line
end

- (Object) source_name

Returns the value of attribute source_name



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# File 'lib/antlr3/error.rb', line 107

def source_name
  @source_name
end

- (Object) symbol

Returns the value of attribute symbol



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# File 'lib/antlr3/error.rb', line 107

def symbol
  @symbol
end

- (Object) token

Returns the value of attribute token



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# File 'lib/antlr3/error.rb', line 107

def token
  @token
end

Instance Method Details

- (Boolean) approximate_line_info?

Returns:

  • (Boolean) 


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# File 'lib/antlr3/error.rb', line 143

def approximate_line_info?
  @approximate_line_info
end

- (Object) location 



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# File 'lib/antlr3/error.rb', line 159

def location
  if @source_name then "in #@source_name @ line #@line:#@column"
  else "line #@line:#@column"
  end
end

- (Object) unexpected_type 



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# File 'lib/antlr3/error.rb', line 147

def unexpected_type
  case @input
  when TokenStream
    @symbol.type
  when AST::TreeNodeStream
    adaptor = @input.adaptor
    return adaptor.type( @symbol )
  else
    return @symbol
  end
end