pyparsing 3.2.0b1

Pyparsing 3.2.0b1

on Python PyPI

Discontinued support for Python 3.6, 3.7, and 3.8. Adopted new Python features from Python versions 3.7-3.9:

• Updated type annotations to use built-in container types instead of names imported from the typing module (e.g., list[str] vs List[str]).
• Reworked portions of the packrat cache to leverage insertion-preserving ordering in dicts.
• Changed pdb.set_trace() call in ParserElement.set_break() to breakpoint().
• Converted typing.NamedTuple to dataclasses.dataclass in railroad diagramming code.
• Added from __future__ import annotations to clean up some type annotations.

POSSIBLE BREAKING CHANGE: Fixed code in ParseElementEnhance subclasses that replaced detailed exception messages raised in contained expressions with a less-specific and less-informative generic exception message and location.

If your code has conditional logic based on the message content in raised ParseExceptions, this bugfix may require changes in your code.

Fixed the displayed output of Regex terms to deduplicate repeated backslashes, for easier reading in debugging, printing, and railroad diagrams.

Fixed (or at least reduced) elusive bug when generating railroad diagrams, where some diagram elements were just empty blocks. Fix submitted by RoDuth, thanks a ton!

Added indent and base_1 arguments to pyparsing.testing.with_line_numbers. When using with_line_numbers inside a parse action, set base_1=False, since the reported loc value is 0-based. indent can be a leading string (typically of spaces or tabs) to indent the numbered string passed to with_line_numbers. Added while working on #557, reported by Bernd Wechner.

Added query syntax to mongodb_query_expression.py with better support for array fields ("contains", "contains all", "contains any", and "contains none"); and "like" and "not like" operators to support SQL "%" wildcard matching and "=~" operator to support regex matching. Also:

• added support for dates and datetimes as query values
• added support for a[0] style array referencing

Added lox_parser.py example, a parser for the Lox language used as a tutorial in Robert Nystrom's "Crafting Interpreters" (http://craftinginterpreters.com/). With helpful corrections from RoDuth.

Added complex_chemical_formulas.py example, to add parsing capability for formulas such as "3(C₆H₅OH)₂".