Evaluates a fully-parsed expression.

Tokenizes a string.

Parses an expression and converts it to its normalized text form.

Recursively parses a tokenized expression.

Parses and evaluates string containing a syscfg expression.

Produces a string representation of a token sequence.

Evaluates the truthfulness of a text expression.

ExprMap is a collection of named expression sets.

ExprSet is a set of expressions.

Returns length of token on success; 0 if no match.