pyparsing 3.3.3

Pyparsing 3.3.3

on Python PyPI

Added support for Python 3.15.

Fixed CI unit test jobs selecting a tox environment with no test commands. The matrix and fallback now select py-unit, as diagnosed and proposed by glaziermag in issue #662; submitted by Neal Lin et AI.

Refactored recursive implementations in pyparsing, for improved performance and reduced memory usage.

• repetition using a large upper bound with multiplication or slicing notation has replaced a recursive Optional expression with a modified ZeroOrMore expression, using a new max argument. PR #652, submitted by sudo.

• nested_expr now uses an internal class that maintains its own stack for managing nesting levels.

• infix_notation replaced its recursive implementation with a shunting-yard algorithm.

These changes should not cause any regressions in existing code, and tests show significant performance improvements for some of the more complex examples. Railroad diagrams may render differently, since they now no longer rely on recursion using Forward expressions.