The GlobTree interface allows one to construct arbitrarily complex boolean expressions for evaluating whether to accept or reject a filename.

INTERFACE GlobTree;

IMPORT Glob, RegEx;

CONST
  Brand = "GlobTree 1.0";

TYPE
  T = OBJECT METHODS
    test(filename: TEXT): BOOLEAN;
  END;

VAR
  False, True: T;  (* CONST *)

Expressions are trees constructed from nodes representing either primitive matching operations (primaries) or operators that are applied to their subexpressions. The simplest primitives are False, which matches nothing, and True, which matches everything.

A more useful primitive is the matching operation. It is constructed with a glob-style pattern. Its test method returns an indication of whether the given filename matches the pattern.

Expressions can be combined with the boolean operators AND, OR, and NOT, to form more complex expressions.

PROCEDURE Match(pattern: TEXT; options := Glob.MatchOptions{}): T;

Return a match primitive for the given pattern. Matching is performed by Glob.Match, using the specified options.

PROCEDURE RegExMatch(pattern: TEXT): T RAISES {RegEx.Error};

Like Match but the pattern is a regular expression.

PROCEDURE And(left, right: T): T;

Return an AND expression.

PROCEDURE Or(left, right: T): T;

Return an OR expression.

PROCEDURE Not(child: T): T;

Return an expression that evaluates the logical negation of its subexpression.

END GlobTree.