Changelog History
Page 9
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v1.0.1 Changes
December 17, 2003NOTE: Changed API!
- Renamed 'len' argument on Word.init() to 'exact'
๐ Performance speed-up, 10-30%
-
v1.0.0 Changes
December 15, 2003- ๐ Initial public release
-
v0.1.1 Changes
- ๐ initial development iterations:
- added Dict, Group
- added helper methods oneOf, delimitedList
- added helpers quotedString (and double and single), restOfLine, cStyleComment
- added MatchFirst as an alternative to the slower Or
- added UML class diagram
- fixed various logic bugs
- ๐ initial development iterations:
-
v0.0.b1 Changes
November 03, 2020API CHANGE
๐ Diagnostic flags have been moved to an enum,pyparsing.Diagnostics
, and they are enabled through module-level methods:pyparsing.enable_diag()
pyparsing.disable_diag()
-
pyparsing.enable_all_warnings()
API CHANGE
โ Most previousSyntaxWarnings
that were warned when using pyparsing classes incorrectly have been converted toTypeError
andValueError
exceptions, consistent with Python calling conventions. All warnings warned by diagnostic flags have been converted fromSyntaxWarnings
toUserWarnings
.๐ To support parsers that are intended to generate native Python collection types such as lists and dicts, the
Group
andDict
classes now accept an additional boolean keyword argumentaslist
andasdict
respectively. See thejsonParser.py
example in thepyparsing/examples
source directory for how to return types asParseResults
and as Python collection types, and the distinctions in working with the different types.0๏ธโฃ In addition parse actions that must return a value of list type (which would normally be converted internally to a ParseResults) can override this default behavior by returning their list wrapped in the new
ParseResults.List
class:# this parse action tries to return a list, but pyparsing # will convert to a ParseResults def return_as_list_but_still_get_parse_results(tokens): return tokens.asList() # this parse action returns the tokens as a list, and pyparsing will # maintain its list type in the final parsing results def return_as_list(tokens): return ParseResults.List(tokens.asList())
This is the mechanism used internally by the
Group
class when defined usingaslist=True
.A new
IndentedBlock
class is introduced, to eventually replace the currentindentedBlock
helper method. The interface is largely the same, however, the new class manages its own internal indentation stack, so it is no longer necessary to maintain an externalindentStack
variable.API CHANGE
๐ Addedcache_hit
keyword argument to debug actions. Previously, if packrat parsing was enabled, the debug methods were not called in the event of cache hits. Now these methods will be called, with an added argumentcache_hit=True
.๐ If you are using packrat parsing and enable debug on expressions using a custom debug method, you can add the
cache_hit=False
keyword argument,
and your method will be called on packrat cache hits. If you choose not to add this keyword argument, the debug methods will fail silently, behaving as they did previously.๐ When using
setDebug
with packrat parsing enabled, packrat cache hits will now be included in the output, shown with a leading '*'. (Previously, cache hits and responses were not included in debug output.) For those using custom debug actions, see the previous item regarding an optional API change for those methods.๐
setDebug
output will also show more details about what expression is about to be parsed (the current line of text being parsed, and the current parse position):Match integer at loc 0(1,1) 1 2 3 ^ Matched integer -> ['1']
๐ The current debug location will also be indicated after whitespace has been skipped (was previously inconsistent, reported in Issue #244, by Frank Goyens, thanks!).
๐ Modified the repr() output for
ParseResults
to include the class name as part of the output. This is to clarify for new pyparsing users who misread the repr output as a tuple of a list and a dict. pyparsing results will now read like:ParseResults(['abc', 'def'], {'qty': 100}]
instead of just:
(['abc', 'def'], {'qty': 100}]
๐ Fixed bugs in Each when passed OneOrMore or ZeroOrMore expressions:
. first expression match could be enclosed in an extra nesting level
. out-of-order expressions now handled correctly if mixed with required expressions
. results names are maintained correctly for these expressionsโช Fixed traceback trimming, and added
ParserElement.verbose_traceback
save/restore toreset_pyparsing_context()
.0๏ธโฃ Default string for
Word
expressions now also include indications ofmin
andmax
length specification, if applicable, similar to regex length specifications:Word(alphas) -> "W:(A-Za-z)" Word(nums) -> "W:(0-9)" Word(nums, exact=3) -> "W:(0-9){3}" Word(nums, min=2) -> "W:(0-9){2,...}" Word(nums, max=3) -> "W:(0-9){1,3}" Word(nums, min=2, max=3) -> "W:(0-9){2,3}"
For expressions of the
Char
class (similar toWord(..., exact=1)
, the expression is simply the character range in parentheses:Char(nums) -> "(0-9)" Char(alphas) -> "(A-Za-z)"
โ Removed
copy()
override inKeyword
class which did not preserve definition of ident chars from the original expression. PR #233 submitted by jgrey4296, thanks!๐ In addition to
pyparsing. __version__
, there is now also apyparsing. __version_info__
, following the same structure and field names as insys.version_info
. -
v0.0.a2 Changes
June 28, 2020๐ Version 3.0.0a2 - June, 2020
๐ Summary of changes for 3.0.0 can be found in "What's New in Pyparsing 3.0.0" documentation.
API CHANGE
๐ Changed result returned when parsing using countedArray, the array items are no longer returned in a doubly-nested list.๐ 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!
โจ Enhanced default strings created for Word expressions, now showing string ranges if possible.
Word(alphas)
would formerly print asW:(ABCD...)
, now prints asW:(A-Za-z)
.โ Added ignoreWhitespace(recurse:bool = True) and added a recurse argument to leaveWhitespace, both added to provide finer control over pyparsing's whitespace skipping. Also contributed by Michael Milton.
๐ The unicode range definitions for the various languages were recalculated by interrogating the unicodedata module by character name, selecting characters that contained that language in their Unicode name. (Issue #227)
๐ Also, pyparsing_unicode.Korean was renamed to Hangul (Korean is also defined as a synonym for compatibility).
โจ Enhanced ParseResults dump() to show both results names and list subitems. Fixes bug where adding a results name would hide lower-level structures in the ParseResults.
Added new
__diag__
warnings:"warn_on_parse_using_empty_Forward" - warns that a Forward has been included in a grammar, but no expression was attached to it using '<<=' or '<<'
"warn_on_assignment_to_Forward" - warns that a Forward has been created, but was probably later overwritten by erroneously using '=' instead of '<<=' (this is a common mistake when using Forwards) ( currently not working on PyPy )
โ Added ParserElement.recurse() method to make it simpler for grammar utilities to navigate through the tree of expressions in a pyparsing grammar.
๐ 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 by Nicholas42 on GitHub, good catch! (Issue #205)
๐จ Modified refactored modules to use relative imports, as pointed out by setuptools project member jaraco, thank you!
Off-by-one bug found in the roman_numerals.py example, a bug that has been there for about 14 years! PR submitted by Jay Pedersen, nice catch!
๐ A simplified Lua parser has been added to the examples (lua_parser.py).
โ Added make_diagram.py to the examples directory to demonstrate creation of railroad diagrams for selected pyparsing examples. Also restructured some examples to make their parsers importable without running their embedded tests.