Loyc.Syntax.Lexing.LexerWrapper< Token > Class Template Reference

A base class for wrappers that modify lexer behavior. Implements the ILexer interface, except for the NextToken() method. More...

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Source file:

• /Core/Loyc.Syntax/Lexing/ILexer.cs

Inheritance diagram for Loyc.Syntax.Lexing.LexerWrapper< Token >:

Remarks

A base class for wrappers that modify lexer behavior. Implements the ILexer interface, except for the NextToken() method.

Properties
ILexer< Token >	Lexer [get, set]
ISourceFile	SourceFile [get]
virtual IMessageSink	ErrorSink [get, set]
int	IndentLevel [get]
UString	IndentString [get]
int	LineNumber [get]
int	InputPosition [get]
Properties inherited from Loyc.Syntax.Lexing.ILexer< Token >
ISourceFile	SourceFile [get]
	The file being lexed. More...
IMessageSink	ErrorSink [get, set]
	Event handler for errors. More...
int	IndentLevel [get]
	Indentation level of the current line. This is updated after scanning the first whitespaces on a new line, and may be reset to zero when NextToken() returns a newline. More...
UString	IndentString [get]
	Gets a string slice that holds the spaces or tabs that were used to indent the current line. More...
int	LineNumber [get]
	Current line number (1 for the first line). More...
int	InputPosition [get]
	Current input position (an index into SourceFile.Text). More...

Public Member Functions
	LexerWrapper (ILexer< Token > sourceLexer)
abstract Maybe< Token >	NextToken ()
	Returns the next (postprocessed) token. This method should set the _current field to the returned value. More...
SourcePos	IndexToLine (int index)
	Returns the position in a source file of the specified index. More...
virtual void	Reset ()

Protected Member Functions
void	WriteError (int index, string msg, params object[] args)

Protected fields
Maybe< Token >	_current

Member Function Documentation

SourcePos Loyc.Syntax.Lexing.LexerWrapper< Token >.IndexToLine ( int  index )

inline

Returns the position in a source file of the specified index.

If index is negative, this should return a SourcePos where Line and PosInLine are zero (signifying an unknown location). If index is beyond the end of the file, this should retun the final position in the file.

Implements Loyc.Syntax.IIndexToLine.

abstract Maybe<Token> Loyc.Syntax.Lexing.LexerWrapper< Token >.NextToken ( )

pure virtual

Returns the next (postprocessed) token. This method should set the _current field to the returned value.

Implements Loyc.Syntax.Lexing.ILexer< Token >.

Implemented in Loyc.Ecs.Parser.CommentSaver, Loyc.Syntax.Lexing.IndentTokenGenerator< Token >, Loyc.Ecs.Parser.EcsPreprocessor, Loyc.Syntax.Lexing.TokensToTree, and Loyc.Syntax.Lexing.WhitespaceFilter< Token >.