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Loyc.Syntax.BaseParser< Token, MatchType >.SavePosition Struct Reference

A helper class used by LLLPG for backtracking. More...


Source file:
Inheritance diagram for Loyc.Syntax.BaseParser< Token, MatchType >.SavePosition:
Loyc.Syntax.BaseParser< Token, MatchType >

Remarks

A helper class used by LLLPG for backtracking.

Public fields

BaseParser< Token, MatchType > _parser
 
int _oldPosition
 

Public Member Functions

 SavePosition (BaseParser< Token, MatchType > parser, int lookaheadAmt)
 
void Dispose ()
 

Additional Inherited Members

- Public static fields inherited from Loyc.Syntax.BaseParser< Token, MatchType >
static readonly IMessageSink FormatExceptionErrorSink
 Throws FormatException when it receives an error. Non-errors are sent to MessageSink.Current. More...
 
- Properties inherited from Loyc.Syntax.BaseParser< Token, MatchType >
IMessageSink ErrorSink [get, set]
 Gets or sets the object to which error messages are sent. The default object is FormatExceptionErrorSink, which throws FormatException if an error occurs. More...
 
ISourceFile SourceFile [get]
 The ISourceFile object that was provided to the constructor, if any. More...
 
Token LT0 [get]
 Next token to parse (cached; is set to LT(0) whenever InputPosition is changed). More...
 
int InputPosition [get, set]
 Current position of the next token to be parsed. More...
 
abstract MatchType LA0Int [get]
 Returns the token type of _lt0 (normally _lt0.TypeInt) More...
 
- Protected Member Functions inherited from Loyc.Syntax.BaseParser< Token, MatchType >
 BaseParser (ISourceFile file=null, int startIndex=0)
 
abstract MatchType EofInt ()
 Returns the value used for EOF (normally 0) More...
 
abstract Token LT (int i)
 Returns the token at lookahead i (e.g. Source[InputPosition + i] if the tokens come from a list called Source) More...
 
abstract string ToString (MatchType tokenType)
 Returns a string representation of the specified token type. These strings are used in error messages. More...
 
virtual int LaIndexToCharIndex (int lookaheadIndex)
 Converts a lookahead token index to a character index (used for error reporting). More...
 
virtual object LaIndexToSourcePos (int lookaheadIndex)
 Converts a lookahead token index to a SourcePos object using LaIndexToCharIndex and SourceFile. More...
 
virtual void Error (int lookaheadIndex, string message)
 Records an error or throws an exception. More...
 
virtual void Error (int lookaheadIndex, string format, params object[] args)
 
void Skip ()
 
Token MatchAny ()
 
Token Match (HashSet< MatchType > set, bool inverted=false)
 
Token Match (MatchType a)
 
Token Match (MatchType a, MatchType b)
 
Token Match (MatchType a, MatchType b, MatchType c)
 
Token Match (MatchType a, MatchType b, MatchType c, MatchType d)
 
Token MatchExcept ()
 
Token MatchExcept (MatchType a)
 
Token MatchExcept (MatchType a, MatchType b)
 
Token MatchExcept (MatchType a, MatchType b, MatchType c)
 
Token MatchExcept (MatchType a, MatchType b, MatchType c, MatchType d)
 
Token MatchExcept (HashSet< MatchType > set)
 
bool TryMatch (HashSet< MatchType > set, bool inverted=false)
 
bool TryMatch (MatchType a)
 
bool TryMatch (MatchType a, MatchType b)
 
bool TryMatch (MatchType a, MatchType b, MatchType c)
 
bool TryMatch (MatchType a, MatchType b, MatchType c, MatchType d)
 
bool TryMatchExcept ()
 
bool TryMatchExcept (MatchType a)
 
bool TryMatchExcept (MatchType a, MatchType b)
 
bool TryMatchExcept (MatchType a, MatchType b, MatchType c)
 
bool TryMatchExcept (MatchType a, MatchType b, MatchType c, MatchType d)
 
bool TryMatchExcept (HashSet< MatchType > set)
 
void Error (bool inverted, params MatchType[] expected)
 
virtual void Error (bool inverted, IEnumerable< MatchType > expected)
 
virtual string ToString (bool inverted, IEnumerable< MatchType > expected)
 
virtual void Check (bool expectation, string expectedDescr="")
 
- Static Protected Member Functions inherited from Loyc.Syntax.BaseParser< Token, MatchType >
static HashSet< MatchType > NewSet (params MatchType[] items)
 
- Protected fields inherited from Loyc.Syntax.BaseParser< Token, MatchType >
ISourceFile _sourceFile
 
Token _lt0
 
int _inputPosition
 
MatchType EOF