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| -rw-r--r-- | CHANGES | 23 |
1 files changed, 23 insertions, 0 deletions
@@ -71,6 +71,29 @@ Version 3.0.0a2 the array items are no long returned in a doubly-nested list. +- An excellent new enhancement is the new railroad diagram + generator for documenting pyparsing parsers: + + import pyparsing as pp + from pyparsing.diagram import to_railroad, railroad_to_html + from pathlib import Path + + # define a simple grammar for parsing street addresses such + # as "123 Main Street" + # number word... + number = pp.Word(pp.nums).setName("number") + name = pp.Word(pp.alphas).setName("word")[1, ...] + + parser = number("house_number") + name("street") + parser.setName("street address") + + # construct railroad track diagram for this parser and + # save as HTML + rr = to_railroad(parser) + Path('parser_rr_diag.html').write_text(railroad_to_html(rr)) + + Very nice work provided by Michael Milton, thanks a ton! + - Fixed bug in ParseResults repr() which showed all matching entries for a results name, even if listAllMatches was set to False when creating the ParseResults originally. Reported |