TOK

< Unknown

< Whitespace

< Symbol

< Attribute Symbol (starting with $)

< Action Symbol (starting with @)

< Number

< Single line comment

< Multi-line (block) comment

< Left parenthesis

< Right parenthesis

< Code block

< Alternatives within '[' ... ']'

< Text literal, single or double quoted

< Colon :

< Semicolon ;

< Hash #

< Label assignment =

< List label assignment +=

< Greedy optional or semantic predicate (?)

< Non-Greedy optional (??)

< Greedy zero or more (*)

< Non-Greedy Zero or more (*?)

< Greedy one or more (+)

< Non-Greedy One or more (+?)

< Alternative (|)

< Match negation (~)

< <

< >

< .

< Exclude from AST (!)

< Root node (^)

< .

< ..

< Rewrite rule (->)

Syntactic predicate rule rewrite (=>).

Wikipedia: A syntactic predicate specifies the syntactic validity of applying a production in a formal grammar and is analogous to a semantic predicate that specifies the semantic validity of applying a production. It is a simple and effective means of dramatically improving the recognition strength of an LL parser by providing arbitrary lookahead. In their original implementation, syntactic predicates had the form “( α )?” and could only appear on the left edge of a production. The required syntactic condition α could be any valid context-free grammar fragment.

See_Also: https://en.wikipedia.org/wiki/Syntactic_predicate See_Also: https://wincent.com/wiki/ANTLR_predicates

Token spec options: "<" id ASSIGN optionValue ( SEMI id ASSIGN optionValue )* ">" ;

< Error token