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.leave_whitespace() may make unnecessary copies #525

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.leave_whitespace() may make unnecessary copies#525
@InSyncWithFoo

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@InSyncWithFoo
InSyncWithFoo
opened on Nov 14, 2023

A module of mine has tens of (nested) element definitions, all have .leave_whitespace() called; it takes several seconds to run. It took me quite some time to realize that pyparsing were making copies of nested elements, which is unnecessary for my use case:

pyparsing/pyparsing/core.py

Lines 3738 to 3749 in fad68f4

def leave_whitespace(self, recursive: bool = True) -> ParserElement:
"""
Extends ``leave_whitespace`` defined in base class, and also invokes ``leave_whitespace`` on
all contained expressions.
"""
super().leave_whitespace(recursive)
if recursive:
self.exprs = [e.copy() for e in self.exprs]
for e in self.exprs:
e.leave_whitespace(recursive)
return self

pyparsing/pyparsing/core.py

Lines 4524 to 4531 in fad68f4

def leave_whitespace(self, recursive: bool = True) -> ParserElement:
super().leave_whitespace(recursive)
if recursive:
if self.expr is not None:
self.expr = self.expr.copy()
self.expr.leave_whitespace(recursive)
return self

In the same spirit with recursive (#219), I think another parameter should also be introduced to configure the behavior.

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