From 5eafa07470a3e761944ff5af00dbcd794dfa09da Mon Sep 17 00:00:00 2001 From: Max Fischer Date: Fri, 30 Jul 2021 14:51:33 +0200 Subject: Add support for LR parsing * first draft of LR parsing * removed debug output * cache is owned and cleared by ParserElement * bounded recursion must be enabled explicitly * packrat rejects recursion * basic LR unit test * tests for associativity and nesting * added math example * fixed test typo * unittest for empty and non-peg clauses * LR-Forward can match Empty * fixed test typos * added base case to unittest * memo cache only provides copies * flattened Forward parse method * added high-level description of algorithm * expanded docstring * added tests for repetition rules * renamed bounded to left recursion * naive test for existing suite * explicitly testing tests for LR compatibility * LR memo no longer mixes action/no-action results * simplified replacement logic * adjusted example with ambiguous failure case * LR memo content is always returned as copy * draft for peeking recursion * memo update consistent for all actions * fixed a bug for non-string token identifiers * action wins against no-action * cleanup * properly setting names in tests * memoization can be turned off * testing memo switches * typos * flattened recursion memo * left recursion memo size may be limited * adjusted docs for recursion cache --- pyparsing/results.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'pyparsing/results.py') diff --git a/pyparsing/results.py b/pyparsing/results.py index fb03ecd..fa94a00 100644 --- a/pyparsing/results.py +++ b/pyparsing/results.py @@ -522,7 +522,7 @@ class ParseResults: Returns a new copy of a :class:`ParseResults` object. """ ret = ParseResults(self._toklist) - ret._tokdict = dict(**self._tokdict) + ret._tokdict = self._tokdict.copy() ret._parent = self._parent ret._all_names |= self._all_names ret._name = self._name -- cgit v1.2.1