Log of /trunk/pg/lib/Parser/Context/Functions.pm

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Revision 3483 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Fri Aug 12 01:21:48 2005 UTC (14 years, 3 months ago) by dpvc
File length: 3387 byte(s)
Diff to previous 3332

Added redefine() function to complement undefine() for various
Context() values.  For example

      Context()->operators->undefine('+');

makes '+' undefined, but

      Context()->operators->redefine('+');

will put it back.  You can specify a context from which to take the
redefinition, and a name in that context, as in

      Context()->operators->redefine('U',from=>"Interval");
      Context()->operators->redefine('u',from=>"Interval",using=>"U");
      Context()->operators->redefine('U',from=>$content);

where $content is a reference to a Context object.

The undefine() function lets you undefine several items at once, as in

      Context()->operators->undefine('+','-');

For redefine, you must put multiple names in square brackets because
of the optional parmeters:

      Context()->operators->redefine(['+','-']);

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Revision 3332 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Sun Jul 3 20:05:28 2005 UTC (14 years, 5 months ago) by dpvc
File length: 2894 byte(s)
Diff to previous 3274

Fixed a bug in the enable/disable routines that would cause them to
always work on the current context rather than the one whose
enable/disable method was being called.

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Revision 3274 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Thu Jun 9 11:16:01 2005 UTC (14 years, 6 months ago) by dpvc
File length: 2900 byte(s)
Diff to previous 2672

Fixed Disable() and Enable() so that they can be called as

    Context()->functions->disable()
and
    Context()->functions->enable()

as well as

    Parser::Context::Functions::Disable()
and
    Parser::Context::Functions::Enable()

The former is the preferred syntax.

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Revision 2672 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Sun Aug 22 22:46:14 2004 UTC (15 years, 3 months ago) by dpvc
File length: 2732 byte(s)
Diff to previous 2579

Added easy calls to disable/enable collections of functions or
individual functions in the current context.  So you can say

	   Parser::Context::Functions::Disable('Trig');

to disallow the use of trig functions, or

	   Parser::Context::Functions::Disable('Trig','Numeric');
	   Parser::Context::Functions::Enable('sqrt');

to disable trig and numeric functions (like log, exp, abs, etc) but
allow sqrt.

Note that disabling sqrt() does not disable x^(1/2) (this must be done
through disabling the ^ and ** operators), and disabling abs() does
not disable |x| (which must be done by removing the '|' definition
from the Context's parens list).

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Revision 2579 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Mon Aug 9 21:38:01 2004 UTC (15 years, 4 months ago) by dpvc
File length: 841 byte(s)
Diff to previous 2558

Significant update to new parser.

New features include:

  Better control over format of vector output (you can now
    specify ijk-format rather than <...> format)

  "Fuzzy" reals, where the relations like == return true when the
    two values are "close enough".  (This is controlable using
    parameters similar to those used in NUM_CMP).

  The fuzzy reals are now used in vectors/points/matrices/complexes/intervals
    and so on so that their relations will also be fuzzy.  E.g.,
    (1E-13,2) == (0,3) will be true, and norm(Vector(0,1E-13)) will
    equal 0.

  The two main portions of the parser (the Parser and Value packages)
    now share a common context object for configuration purposes.

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Revision 2558 - (view) (download) (as text) (annotate) - [select for diffs]
Added Wed Jul 28 20:32:33 2004 UTC (15 years, 4 months ago) by sh002i
File length: 842 byte(s)

merged changes from rel-2-1-a1 -- stop using that branch.