Copyright 1996-1998 John D. Polstra.
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* This product includes software developed by John D. Polstra.
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* $Id: GlobTree.i3.html,v 1.5 2010-04-29 17:19:49 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.