patternmatching/src/GlobTree.i3


 Copyright 1996-1998 John D. Polstra.
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 * $Id: GlobTree.i3,v 1.1 2001-12-01 16:07:31 wagner Exp $ 

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;

TYPE
  T = OBJECT METHODS
    test(filename: TEXT): BOOLEAN RAISES {RegEx.Error};
  END;

VAR
  False, True: T;  (* CONST *)
A GlobTree.T represents a boolean expression for filtering filenames. Its test method may be called with a filename to be tested. It returns TRUE or FALSE according to whether the name is accepted or rejected by the expression.

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 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.

GlobTree's implementation is in:


interface Glob is in:


interface RegEx is in:


procedure GlobTree.Match is in:


procedure GlobTree.And is in:


procedure GlobTree.Or is in:


procedure GlobTree.Not is in: