Loyc.LLParserGenerator.LLParserGenerator.Transition Class Reference

Represents a position in a grammar (GrammarPos) plus the set of characters that leads to that position from the previous position. This is a single case in a KthSet. More...

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Source file:

• /Main/LLLPG/CoreEngine/KthSet.cs

Inheritance diagram for Loyc.LLParserGenerator.LLParserGenerator.Transition:

Remarks

Represents a position in a grammar (GrammarPos) plus the set of characters that leads to that position from the previous position. This is a single case in a KthSet.

For example, suppose the grammar is

rule X ==> @[ 'a' Y 'z' ];
rule Y ==> @[ 'a'..'y' 'b'..'z' ];

If the previous position is represented by the dot in 'a'.Y 'z', i.e. before Y, then ComputeNextSet will compute a Transition with Set=[a-y] and Position pointing to .'b'..'z', with a return stack that points to 'a' Y.'z'

Public fields
IPGTerminalSet	Set
VList< AndPred >	AndPreds
GrammarPos	Position
Pred	PrevPosition

Public Member Functions
	Transition (Pred prevPosition, IPGTerminalSet set, GrammarPos position)
	Transition (Pred prevPosition, IPGTerminalSet set, VList< AndPred > andPreds, GrammarPos position)
override string	ToString ()
Transition	Clone ()