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# module pyparsing.py
#
# Copyright (c) 2003-2022 Paul T. McGuire
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
__doc__ = """
pyparsing module - Classes and methods to define and execute parsing grammars
=============================================================================
The pyparsing module is an alternative approach to creating and
executing simple grammars, vs. the traditional lex/yacc approach, or the
use of regular expressions. With pyparsing, you don't need to learn
a new syntax for defining grammars or matching expressions - the parsing
module provides a library of classes that you use to construct the
grammar directly in Python.
Here is a program to parse "Hello, World!" (or any greeting of the form
``"<salutation>, <addressee>!"``), built up using :class:`Word`,
:class:`Literal`, and :class:`And` elements
(the :meth:`'+'<ParserElement.__add__>` operators create :class:`And` expressions,
and the strings are auto-converted to :class:`Literal` expressions)::
from pip._vendor.pyparsing import Word, alphas
# define grammar of a greeting
greet = Word(alphas) + "," + Word(alphas) + "!"
hello = "Hello, World!"
print(hello, "->", greet.parse_string(hello))
The program outputs the following::
Hello, World! -> ['Hello', ',', 'World', '!']
The Python representation of the grammar is quite readable, owing to the
self-explanatory class names, and the use of :class:`'+'<And>`,
:class:`'|'<MatchFirst>`, :class:`'^'<Or>` and :class:`'&'<Each>` operators.
The :class:`ParseResults` object returned from
:class:`ParserElement.parse_string` can be
accessed as a nested list, a dictionary, or an object with named
attributes.
The pyparsing module handles some of the problems that are typically
vexing when writing text parsers:
- extra or missing whitespace (the above program will also handle
"Hello,World!", "Hello , World !", etc.)
- quoted strings
- embedded comments
Getting Started -
-----------------
Visit the classes :class:`ParserElement` and :class:`ParseResults` to
see the base classes that most other pyparsing
classes inherit from. Use the docstrings for examples of how to:
- construct literal match expressions from :class:`Literal` and
:class:`CaselessLiteral` classes
- construct character word-group expressions using the :class:`Word`
class
- see how to create repetitive expressions using :class:`ZeroOrMore`
and :class:`OneOrMore` classes
- use :class:`'+'<And>`, :class:`'|'<MatchFirst>`, :class:`'^'<Or>`,
and :class:`'&'<Each>` operators to combine simple expressions into
more complex ones
- associate names with your parsed results using
:class:`ParserElement.set_results_name`
- access the parsed data, which is returned as a :class:`ParseResults`
object
- find some helpful expression short-cuts like :class:`DelimitedList`
and :class:`one_of`
- find more useful common expressions in the :class:`pyparsing_common`
namespace class
"""
from typing import NamedTuple
class version_info(NamedTuple):
major: int
minor: int
micro: int
releaselevel: str
serial: int
@property
def __version__(self):
return (
f"{self.major}.{self.minor}.{self.micro}"
+ (
f"{'r' if self.releaselevel[0] == 'c' else ''}{self.releaselevel[0]}{self.serial}",
"",
)[self.releaselevel == "final"]
)
def __str__(self):
return f"{__name__} {self.__version__} / {__version_time__}"
def __repr__(self):
return f"{__name__}.{type(self).__name__}({', '.join('{}={!r}'.format(*nv) for nv in zip(self._fields, self))})"
__version_info__ = version_info(3, 1, 0, "final", 1)
__version_time__ = "18 Jun 2023 14:05 UTC"
__version__ = __version_info__.__version__
__versionTime__ = __version_time__
__author__ = "Paul McGuire <ptmcg.gm+pyparsing@gmail.com>"
from .util import *
from .exceptions import *
from .actions import *
from .core import __diag__, __compat__
from .results import *
from .core import * # type: ignore[misc, assignment]
from .core import _builtin_exprs as core_builtin_exprs
from .helpers import * # type: ignore[misc, assignment]
from .helpers import _builtin_exprs as helper_builtin_exprs
from .unicode import unicode_set, UnicodeRangeList, pyparsing_unicode as unicode
from .testing import pyparsing_test as testing
from .common import (
pyparsing_common as common,
_builtin_exprs as common_builtin_exprs,
)
# define backward compat synonyms
if "pyparsing_unicode" not in globals():
pyparsing_unicode = unicode # type: ignore[misc]
if "pyparsing_common" not in globals():
pyparsing_common = common # type: ignore[misc]
if "pyparsing_test" not in globals():
pyparsing_test = testing # type: ignore[misc]
core_builtin_exprs += common_builtin_exprs + helper_builtin_exprs
__all__ = [
"__version__",
"__version_time__",
"__author__",
"__compat__",
"__diag__",
"And",
"AtLineStart",
"AtStringStart",
"CaselessKeyword",
"CaselessLiteral",
"CharsNotIn",
"CloseMatch",
"Combine",
"DelimitedList",
"Dict",
"Each",
"Empty",
"FollowedBy",
"Forward",
"GoToColumn",
"Group",
"IndentedBlock",
"Keyword",
"LineEnd",
"LineStart",
"Literal",
"Located",
"PrecededBy",
"MatchFirst",
"NoMatch",
"NotAny",
"OneOrMore",
"OnlyOnce",
"OpAssoc",
"Opt",
"Optional",
"Or",
"ParseBaseException",
"ParseElementEnhance",
"ParseException",
"ParseExpression",
"ParseFatalException",
"ParseResults",
"ParseSyntaxException",
"ParserElement",
"PositionToken",
"QuotedString",
"RecursiveGrammarException",
"Regex",
"SkipTo",
"StringEnd",
"StringStart",
"Suppress",
"Token",
"TokenConverter",
"White",
"Word",
"WordEnd",
"WordStart",
"ZeroOrMore",
"Char",
"alphanums",
"alphas",
"alphas8bit",
"any_close_tag",
"any_open_tag",
"autoname_elements",
"c_style_comment",
"col",
"common_html_entity",
"condition_as_parse_action",
"counted_array",
"cpp_style_comment",
"dbl_quoted_string",
"dbl_slash_comment",
"delimited_list",
"dict_of",
"empty",
"hexnums",
"html_comment",
"identchars",
"identbodychars",
"infix_notation",
"java_style_comment",
"line",
"line_end",
"line_start",
"lineno",
"make_html_tags",
"make_xml_tags",
"match_only_at_col",
"match_previous_expr",
"match_previous_literal",
"nested_expr",
"null_debug_action",
"nums",
"one_of",
"original_text_for",
"printables",
"punc8bit",
"pyparsing_common",
"pyparsing_test",
"pyparsing_unicode",
"python_style_comment",
"quoted_string",
"remove_quotes",
"replace_with",
"replace_html_entity",
"rest_of_line",
"sgl_quoted_string",
"srange",
"string_end",
"string_start",
"token_map",
"trace_parse_action",
"ungroup",
"unicode_set",
"unicode_string",
"with_attribute",
"with_class",
# pre-PEP8 compatibility names
"__versionTime__",
"anyCloseTag",
"anyOpenTag",
"cStyleComment",
"commonHTMLEntity",
"conditionAsParseAction",
"countedArray",
"cppStyleComment",
"dblQuotedString",
"dblSlashComment",
"delimitedList",
"dictOf",
"htmlComment",
"indentedBlock",
"infixNotation",
"javaStyleComment",
"lineEnd",
"lineStart",
"locatedExpr",
"makeHTMLTags",
"makeXMLTags",
"matchOnlyAtCol",
"matchPreviousExpr",
"matchPreviousLiteral",
"nestedExpr",
"nullDebugAction",
"oneOf",
"opAssoc",
"originalTextFor",
"pythonStyleComment",
"quotedString",
"removeQuotes",
"replaceHTMLEntity",
"replaceWith",
"restOfLine",
"sglQuotedString",
"stringEnd",
"stringStart",
"tokenMap",
"traceParseAction",
"unicodeString",
"withAttribute",
"withClass",
]

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# actions.py
from .exceptions import ParseException
from .util import col, replaced_by_pep8
class OnlyOnce:
"""
Wrapper for parse actions, to ensure they are only called once.
"""
def __init__(self, method_call):
from .core import _trim_arity
self.callable = _trim_arity(method_call)
self.called = False
def __call__(self, s, l, t):
if not self.called:
results = self.callable(s, l, t)
self.called = True
return results
raise ParseException(s, l, "OnlyOnce obj called multiple times w/out reset")
def reset(self):
"""
Allow the associated parse action to be called once more.
"""
self.called = False
def match_only_at_col(n):
"""
Helper method for defining parse actions that require matching at
a specific column in the input text.
"""
def verify_col(strg, locn, toks):
if col(locn, strg) != n:
raise ParseException(strg, locn, f"matched token not at column {n}")
return verify_col
def replace_with(repl_str):
"""
Helper method for common parse actions that simply return
a literal value. Especially useful when used with
:class:`transform_string<ParserElement.transform_string>` ().
Example::
num = Word(nums).set_parse_action(lambda toks: int(toks[0]))
na = one_of("N/A NA").set_parse_action(replace_with(math.nan))
term = na | num
term[1, ...].parse_string("324 234 N/A 234") # -> [324, 234, nan, 234]
"""
return lambda s, l, t: [repl_str]
def remove_quotes(s, l, t):
"""
Helper parse action for removing quotation marks from parsed
quoted strings.
Example::
# by default, quotation marks are included in parsed results
quoted_string.parse_string("'Now is the Winter of our Discontent'") # -> ["'Now is the Winter of our Discontent'"]
# use remove_quotes to strip quotation marks from parsed results
quoted_string.set_parse_action(remove_quotes)
quoted_string.parse_string("'Now is the Winter of our Discontent'") # -> ["Now is the Winter of our Discontent"]
"""
return t[0][1:-1]
def with_attribute(*args, **attr_dict):
"""
Helper to create a validating parse action to be used with start
tags created with :class:`make_xml_tags` or
:class:`make_html_tags`. Use ``with_attribute`` to qualify
a starting tag with a required attribute value, to avoid false
matches on common tags such as ``<TD>`` or ``<DIV>``.
Call ``with_attribute`` with a series of attribute names and
values. Specify the list of filter attributes names and values as:
- keyword arguments, as in ``(align="right")``, or
- as an explicit dict with ``**`` operator, when an attribute
name is also a Python reserved word, as in ``**{"class":"Customer", "align":"right"}``
- a list of name-value tuples, as in ``(("ns1:class", "Customer"), ("ns2:align", "right"))``
For attribute names with a namespace prefix, you must use the second
form. Attribute names are matched insensitive to upper/lower case.
If just testing for ``class`` (with or without a namespace), use
:class:`with_class`.
To verify that the attribute exists, but without specifying a value,
pass ``with_attribute.ANY_VALUE`` as the value.
Example::
html = '''
<div>
Some text
<div type="grid">1 4 0 1 0</div>
<div type="graph">1,3 2,3 1,1</div>
<div>this has no type</div>
</div>
'''
div,div_end = make_html_tags("div")
# only match div tag having a type attribute with value "grid"
div_grid = div().set_parse_action(with_attribute(type="grid"))
grid_expr = div_grid + SkipTo(div | div_end)("body")
for grid_header in grid_expr.search_string(html):
print(grid_header.body)
# construct a match with any div tag having a type attribute, regardless of the value
div_any_type = div().set_parse_action(with_attribute(type=with_attribute.ANY_VALUE))
div_expr = div_any_type + SkipTo(div | div_end)("body")
for div_header in div_expr.search_string(html):
print(div_header.body)
prints::
1 4 0 1 0
1 4 0 1 0
1,3 2,3 1,1
"""
if args:
attrs = args[:]
else:
attrs = attr_dict.items()
attrs = [(k, v) for k, v in attrs]
def pa(s, l, tokens):
for attrName, attrValue in attrs:
if attrName not in tokens:
raise ParseException(s, l, "no matching attribute " + attrName)
if attrValue != with_attribute.ANY_VALUE and tokens[attrName] != attrValue:
raise ParseException(
s,
l,
f"attribute {attrName!r} has value {tokens[attrName]!r}, must be {attrValue!r}",
)
return pa
with_attribute.ANY_VALUE = object() # type: ignore [attr-defined]
def with_class(classname, namespace=""):
"""
Simplified version of :class:`with_attribute` when
matching on a div class - made difficult because ``class`` is
a reserved word in Python.
Example::
html = '''
<div>
Some text
<div class="grid">1 4 0 1 0</div>
<div class="graph">1,3 2,3 1,1</div>
<div>this &lt;div&gt; has no class</div>
</div>
'''
div,div_end = make_html_tags("div")
div_grid = div().set_parse_action(with_class("grid"))
grid_expr = div_grid + SkipTo(div | div_end)("body")
for grid_header in grid_expr.search_string(html):
print(grid_header.body)
div_any_type = div().set_parse_action(with_class(withAttribute.ANY_VALUE))
div_expr = div_any_type + SkipTo(div | div_end)("body")
for div_header in div_expr.search_string(html):
print(div_header.body)
prints::
1 4 0 1 0
1 4 0 1 0
1,3 2,3 1,1
"""
classattr = f"{namespace}:class" if namespace else "class"
return with_attribute(**{classattr: classname})
# pre-PEP8 compatibility symbols
# fmt: off
@replaced_by_pep8(replace_with)
def replaceWith(): ...
@replaced_by_pep8(remove_quotes)
def removeQuotes(): ...
@replaced_by_pep8(with_attribute)
def withAttribute(): ...
@replaced_by_pep8(with_class)
def withClass(): ...
@replaced_by_pep8(match_only_at_col)
def matchOnlyAtCol(): ...
# fmt: on

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# common.py
from .core import *
from .helpers import DelimitedList, any_open_tag, any_close_tag
from datetime import datetime
# some other useful expressions - using lower-case class name since we are really using this as a namespace
class pyparsing_common:
"""Here are some common low-level expressions that may be useful in
jump-starting parser development:
- numeric forms (:class:`integers<integer>`, :class:`reals<real>`,
:class:`scientific notation<sci_real>`)
- common :class:`programming identifiers<identifier>`
- network addresses (:class:`MAC<mac_address>`,
:class:`IPv4<ipv4_address>`, :class:`IPv6<ipv6_address>`)
- ISO8601 :class:`dates<iso8601_date>` and
:class:`datetime<iso8601_datetime>`
- :class:`UUID<uuid>`
- :class:`comma-separated list<comma_separated_list>`
- :class:`url`
Parse actions:
- :class:`convert_to_integer`
- :class:`convert_to_float`
- :class:`convert_to_date`
- :class:`convert_to_datetime`
- :class:`strip_html_tags`
- :class:`upcase_tokens`
- :class:`downcase_tokens`
Example::
pyparsing_common.number.run_tests('''
# any int or real number, returned as the appropriate type
100
-100
+100
3.14159
6.02e23
1e-12
''')
pyparsing_common.fnumber.run_tests('''
# any int or real number, returned as float
100
-100
+100
3.14159
6.02e23
1e-12
''')
pyparsing_common.hex_integer.run_tests('''
# hex numbers
100
FF
''')
pyparsing_common.fraction.run_tests('''
# fractions
1/2
-3/4
''')
pyparsing_common.mixed_integer.run_tests('''
# mixed fractions
1
1/2
-3/4
1-3/4
''')
import uuid
pyparsing_common.uuid.set_parse_action(token_map(uuid.UUID))
pyparsing_common.uuid.run_tests('''
# uuid
12345678-1234-5678-1234-567812345678
''')
prints::
# any int or real number, returned as the appropriate type
100
[100]
-100
[-100]
+100
[100]
3.14159
[3.14159]
6.02e23
[6.02e+23]
1e-12
[1e-12]
# any int or real number, returned as float
100
[100.0]
-100
[-100.0]
+100
[100.0]
3.14159
[3.14159]
6.02e23
[6.02e+23]
1e-12
[1e-12]
# hex numbers
100
[256]
FF
[255]
# fractions
1/2
[0.5]
-3/4
[-0.75]
# mixed fractions
1
[1]
1/2
[0.5]
-3/4
[-0.75]
1-3/4
[1.75]
# uuid
12345678-1234-5678-1234-567812345678
[UUID('12345678-1234-5678-1234-567812345678')]
"""
convert_to_integer = token_map(int)
"""
Parse action for converting parsed integers to Python int
"""
convert_to_float = token_map(float)
"""
Parse action for converting parsed numbers to Python float
"""
integer = Word(nums).set_name("integer").set_parse_action(convert_to_integer)
"""expression that parses an unsigned integer, returns an int"""
hex_integer = (
Word(hexnums).set_name("hex integer").set_parse_action(token_map(int, 16))
)
"""expression that parses a hexadecimal integer, returns an int"""
signed_integer = (
Regex(r"[+-]?\d+")
.set_name("signed integer")
.set_parse_action(convert_to_integer)
)
"""expression that parses an integer with optional leading sign, returns an int"""
fraction = (
signed_integer().set_parse_action(convert_to_float)
+ "/"
+ signed_integer().set_parse_action(convert_to_float)
).set_name("fraction")
"""fractional expression of an integer divided by an integer, returns a float"""
fraction.add_parse_action(lambda tt: tt[0] / tt[-1])
mixed_integer = (
fraction | signed_integer + Opt(Opt("-").suppress() + fraction)
).set_name("fraction or mixed integer-fraction")
"""mixed integer of the form 'integer - fraction', with optional leading integer, returns float"""
mixed_integer.add_parse_action(sum)
real = (
Regex(r"[+-]?(?:\d+\.\d*|\.\d+)")
.set_name("real number")
.set_parse_action(convert_to_float)
)
"""expression that parses a floating point number and returns a float"""
sci_real = (
Regex(r"[+-]?(?:\d+(?:[eE][+-]?\d+)|(?:\d+\.\d*|\.\d+)(?:[eE][+-]?\d+)?)")
.set_name("real number with scientific notation")
.set_parse_action(convert_to_float)
)
"""expression that parses a floating point number with optional
scientific notation and returns a float"""
# streamlining this expression makes the docs nicer-looking
number = (sci_real | real | signed_integer).setName("number").streamline()
"""any numeric expression, returns the corresponding Python type"""
fnumber = (
Regex(r"[+-]?\d+\.?\d*([eE][+-]?\d+)?")
.set_name("fnumber")
.set_parse_action(convert_to_float)
)
"""any int or real number, returned as float"""
identifier = Word(identchars, identbodychars).set_name("identifier")
"""typical code identifier (leading alpha or '_', followed by 0 or more alphas, nums, or '_')"""
ipv4_address = Regex(
r"(25[0-5]|2[0-4][0-9]|1?[0-9]{1,2})(\.(25[0-5]|2[0-4][0-9]|1?[0-9]{1,2})){3}"
).set_name("IPv4 address")
"IPv4 address (``0.0.0.0 - 255.255.255.255``)"
_ipv6_part = Regex(r"[0-9a-fA-F]{1,4}").set_name("hex_integer")
_full_ipv6_address = (_ipv6_part + (":" + _ipv6_part) * 7).set_name(
"full IPv6 address"
)
_short_ipv6_address = (
Opt(_ipv6_part + (":" + _ipv6_part) * (0, 6))
+ "::"
+ Opt(_ipv6_part + (":" + _ipv6_part) * (0, 6))
).set_name("short IPv6 address")
_short_ipv6_address.add_condition(
lambda t: sum(1 for tt in t if pyparsing_common._ipv6_part.matches(tt)) < 8
)
_mixed_ipv6_address = ("::ffff:" + ipv4_address).set_name("mixed IPv6 address")
ipv6_address = Combine(
(_full_ipv6_address | _mixed_ipv6_address | _short_ipv6_address).set_name(
"IPv6 address"
)
).set_name("IPv6 address")
"IPv6 address (long, short, or mixed form)"
mac_address = Regex(
r"[0-9a-fA-F]{2}([:.-])[0-9a-fA-F]{2}(?:\1[0-9a-fA-F]{2}){4}"
).set_name("MAC address")
"MAC address xx:xx:xx:xx:xx (may also have '-' or '.' delimiters)"
@staticmethod
def convert_to_date(fmt: str = "%Y-%m-%d"):
"""
Helper to create a parse action for converting parsed date string to Python datetime.date
Params -
- fmt - format to be passed to datetime.strptime (default= ``"%Y-%m-%d"``)
Example::
date_expr = pyparsing_common.iso8601_date.copy()
date_expr.set_parse_action(pyparsing_common.convert_to_date())
print(date_expr.parse_string("1999-12-31"))
prints::
[datetime.date(1999, 12, 31)]
"""
def cvt_fn(ss, ll, tt):
try:
return datetime.strptime(tt[0], fmt).date()
except ValueError as ve:
raise ParseException(ss, ll, str(ve))
return cvt_fn
@staticmethod
def convert_to_datetime(fmt: str = "%Y-%m-%dT%H:%M:%S.%f"):
"""Helper to create a parse action for converting parsed
datetime string to Python datetime.datetime
Params -
- fmt - format to be passed to datetime.strptime (default= ``"%Y-%m-%dT%H:%M:%S.%f"``)
Example::
dt_expr = pyparsing_common.iso8601_datetime.copy()
dt_expr.set_parse_action(pyparsing_common.convert_to_datetime())
print(dt_expr.parse_string("1999-12-31T23:59:59.999"))
prints::
[datetime.datetime(1999, 12, 31, 23, 59, 59, 999000)]
"""
def cvt_fn(s, l, t):
try:
return datetime.strptime(t[0], fmt)
except ValueError as ve:
raise ParseException(s, l, str(ve))
return cvt_fn
iso8601_date = Regex(
r"(?P<year>\d{4})(?:-(?P<month>\d\d)(?:-(?P<day>\d\d))?)?"
).set_name("ISO8601 date")
"ISO8601 date (``yyyy-mm-dd``)"
iso8601_datetime = Regex(
r"(?P<year>\d{4})-(?P<month>\d\d)-(?P<day>\d\d)[T ](?P<hour>\d\d):(?P<minute>\d\d)(:(?P<second>\d\d(\.\d*)?)?)?(?P<tz>Z|[+-]\d\d:?\d\d)?"
).set_name("ISO8601 datetime")
"ISO8601 datetime (``yyyy-mm-ddThh:mm:ss.s(Z|+-00:00)``) - trailing seconds, milliseconds, and timezone optional; accepts separating ``'T'`` or ``' '``"
uuid = Regex(r"[0-9a-fA-F]{8}(-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}").set_name("UUID")
"UUID (``xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx``)"
_html_stripper = any_open_tag.suppress() | any_close_tag.suppress()
@staticmethod
def strip_html_tags(s: str, l: int, tokens: ParseResults):
"""Parse action to remove HTML tags from web page HTML source
Example::
# strip HTML links from normal text
text = '<td>More info at the <a href="https://github.com/pyparsing/pyparsing/wiki">pyparsing</a> wiki page</td>'
td, td_end = make_html_tags("TD")
table_text = td + SkipTo(td_end).set_parse_action(pyparsing_common.strip_html_tags)("body") + td_end
print(table_text.parse_string(text).body)
Prints::
More info at the pyparsing wiki page
"""
return pyparsing_common._html_stripper.transform_string(tokens[0])
_commasepitem = (
Combine(
OneOrMore(
~Literal(",")
+ ~LineEnd()
+ Word(printables, exclude_chars=",")
+ Opt(White(" \t") + ~FollowedBy(LineEnd() | ","))
)
)
.streamline()
.set_name("commaItem")
)
comma_separated_list = DelimitedList(
Opt(quoted_string.copy() | _commasepitem, default="")
).set_name("comma separated list")
"""Predefined expression of 1 or more printable words or quoted strings, separated by commas."""
upcase_tokens = staticmethod(token_map(lambda t: t.upper()))
"""Parse action to convert tokens to upper case."""
downcase_tokens = staticmethod(token_map(lambda t: t.lower()))
"""Parse action to convert tokens to lower case."""
# fmt: off
url = Regex(
# https://mathiasbynens.be/demo/url-regex
# https://gist.github.com/dperini/729294
r"(?P<url>" +
# protocol identifier (optional)
# short syntax // still required
r"(?:(?:(?P<scheme>https?|ftp):)?\/\/)" +
# user:pass BasicAuth (optional)
r"(?:(?P<auth>\S+(?::\S*)?)@)?" +
r"(?P<host>" +
# IP address exclusion
# private & local networks
r"(?!(?:10|127)(?:\.\d{1,3}){3})" +
r"(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})" +
r"(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})" +
# IP address dotted notation octets
# excludes loopback network 0.0.0.0
# excludes reserved space >= 224.0.0.0
# excludes network & broadcast addresses
# (first & last IP address of each class)
r"(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])" +
r"(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}" +
r"(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))" +
r"|" +
# host & domain names, may end with dot
# can be replaced by a shortest alternative
# (?![-_])(?:[-\w\u00a1-\uffff]{0,63}[^-_]\.)+
r"(?:" +
r"(?:" +
r"[a-z0-9\u00a1-\uffff]" +
r"[a-z0-9\u00a1-\uffff_-]{0,62}" +
r")?" +
r"[a-z0-9\u00a1-\uffff]\." +
r")+" +
# TLD identifier name, may end with dot
r"(?:[a-z\u00a1-\uffff]{2,}\.?)" +
r")" +
# port number (optional)
r"(:(?P<port>\d{2,5}))?" +
# resource path (optional)
r"(?P<path>\/[^?# ]*)?" +
# query string (optional)
r"(\?(?P<query>[^#]*))?" +
# fragment (optional)
r"(#(?P<fragment>\S*))?" +
r")"
).set_name("url")
"""URL (http/https/ftp scheme)"""
# fmt: on
# pre-PEP8 compatibility names
convertToInteger = convert_to_integer
"""Deprecated - use :class:`convert_to_integer`"""
convertToFloat = convert_to_float
"""Deprecated - use :class:`convert_to_float`"""
convertToDate = convert_to_date
"""Deprecated - use :class:`convert_to_date`"""
convertToDatetime = convert_to_datetime
"""Deprecated - use :class:`convert_to_datetime`"""
stripHTMLTags = strip_html_tags
"""Deprecated - use :class:`strip_html_tags`"""
upcaseTokens = upcase_tokens
"""Deprecated - use :class:`upcase_tokens`"""
downcaseTokens = downcase_tokens
"""Deprecated - use :class:`downcase_tokens`"""
_builtin_exprs = [
v for v in vars(pyparsing_common).values() if isinstance(v, ParserElement)
]

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# exceptions.py
import re
import sys
import typing
from .util import (
col,
line,
lineno,
_collapse_string_to_ranges,
replaced_by_pep8,
)
from .unicode import pyparsing_unicode as ppu
class ExceptionWordUnicode(ppu.Latin1, ppu.LatinA, ppu.LatinB, ppu.Greek, ppu.Cyrillic):
pass
_extract_alphanums = _collapse_string_to_ranges(ExceptionWordUnicode.alphanums)
_exception_word_extractor = re.compile("([" + _extract_alphanums + "]{1,16})|.")
class ParseBaseException(Exception):
"""base exception class for all parsing runtime exceptions"""
loc: int
msg: str
pstr: str
parser_element: typing.Any # "ParserElement"
args: typing.Tuple[str, int, typing.Optional[str]]
__slots__ = (
"loc",
"msg",
"pstr",
"parser_element",
"args",
)
# Performance tuning: we construct a *lot* of these, so keep this
# constructor as small and fast as possible
def __init__(
self,
pstr: str,
loc: int = 0,
msg: typing.Optional[str] = None,
elem=None,
):
self.loc = loc
if msg is None:
self.msg = pstr
self.pstr = ""
else:
self.msg = msg
self.pstr = pstr
self.parser_element = elem
self.args = (pstr, loc, msg)
@staticmethod
def explain_exception(exc, depth=16):
"""
Method to take an exception and translate the Python internal traceback into a list
of the pyparsing expressions that caused the exception to be raised.
Parameters:
- exc - exception raised during parsing (need not be a ParseException, in support
of Python exceptions that might be raised in a parse action)
- depth (default=16) - number of levels back in the stack trace to list expression
and function names; if None, the full stack trace names will be listed; if 0, only
the failing input line, marker, and exception string will be shown
Returns a multi-line string listing the ParserElements and/or function names in the
exception's stack trace.
"""
import inspect
from .core import ParserElement
if depth is None:
depth = sys.getrecursionlimit()
ret = []
if isinstance(exc, ParseBaseException):
ret.append(exc.line)
ret.append(" " * (exc.column - 1) + "^")
ret.append(f"{type(exc).__name__}: {exc}")
if depth > 0:
callers = inspect.getinnerframes(exc.__traceback__, context=depth)
seen = set()
for i, ff in enumerate(callers[-depth:]):
frm = ff[0]
f_self = frm.f_locals.get("self", None)
if isinstance(f_self, ParserElement):
if not frm.f_code.co_name.startswith(
("parseImpl", "_parseNoCache")
):
continue
if id(f_self) in seen:
continue
seen.add(id(f_self))
self_type = type(f_self)
ret.append(
f"{self_type.__module__}.{self_type.__name__} - {f_self}"
)
elif f_self is not None:
self_type = type(f_self)
ret.append(f"{self_type.__module__}.{self_type.__name__}")
else:
code = frm.f_code
if code.co_name in ("wrapper", "<module>"):
continue
ret.append(code.co_name)
depth -= 1
if not depth:
break
return "\n".join(ret)
@classmethod
def _from_exception(cls, pe):
"""
internal factory method to simplify creating one type of ParseException
from another - avoids having __init__ signature conflicts among subclasses
"""
return cls(pe.pstr, pe.loc, pe.msg, pe.parser_element)
@property
def line(self) -> str:
"""
Return the line of text where the exception occurred.
"""
return line(self.loc, self.pstr)
@property
def lineno(self) -> int:
"""
Return the 1-based line number of text where the exception occurred.
"""
return lineno(self.loc, self.pstr)
@property
def col(self) -> int:
"""
Return the 1-based column on the line of text where the exception occurred.
"""
return col(self.loc, self.pstr)
@property
def column(self) -> int:
"""
Return the 1-based column on the line of text where the exception occurred.
"""
return col(self.loc, self.pstr)
# pre-PEP8 compatibility
@property
def parserElement(self):
return self.parser_element
@parserElement.setter
def parserElement(self, elem):
self.parser_element = elem
def __str__(self) -> str:
if self.pstr:
if self.loc >= len(self.pstr):
foundstr = ", found end of text"
else:
# pull out next word at error location
found_match = _exception_word_extractor.match(self.pstr, self.loc)
if found_match is not None:
found = found_match.group(0)
else:
found = self.pstr[self.loc : self.loc + 1]
foundstr = (", found %r" % found).replace(r"\\", "\\")
else:
foundstr = ""
return f"{self.msg}{foundstr} (at char {self.loc}), (line:{self.lineno}, col:{self.column})"
def __repr__(self):
return str(self)
def mark_input_line(
self, marker_string: typing.Optional[str] = None, *, markerString: str = ">!<"
) -> str:
"""
Extracts the exception line from the input string, and marks
the location of the exception with a special symbol.
"""
markerString = marker_string if marker_string is not None else markerString
line_str = self.line
line_column = self.column - 1
if markerString:
line_str = "".join(
(line_str[:line_column], markerString, line_str[line_column:])
)
return line_str.strip()
def explain(self, depth=16) -> str:
"""
Method to translate the Python internal traceback into a list
of the pyparsing expressions that caused the exception to be raised.
Parameters:
- depth (default=16) - number of levels back in the stack trace to list expression
and function names; if None, the full stack trace names will be listed; if 0, only
the failing input line, marker, and exception string will be shown
Returns a multi-line string listing the ParserElements and/or function names in the
exception's stack trace.
Example::
expr = pp.Word(pp.nums) * 3
try:
expr.parse_string("123 456 A789")
except pp.ParseException as pe:
print(pe.explain(depth=0))
prints::
123 456 A789
^
ParseException: Expected W:(0-9), found 'A' (at char 8), (line:1, col:9)
Note: the diagnostic output will include string representations of the expressions
that failed to parse. These representations will be more helpful if you use `set_name` to
give identifiable names to your expressions. Otherwise they will use the default string
forms, which may be cryptic to read.
Note: pyparsing's default truncation of exception tracebacks may also truncate the
stack of expressions that are displayed in the ``explain`` output. To get the full listing
of parser expressions, you may have to set ``ParserElement.verbose_stacktrace = True``
"""
return self.explain_exception(self, depth)
# fmt: off
@replaced_by_pep8(mark_input_line)
def markInputline(self): ...
# fmt: on
class ParseException(ParseBaseException):
"""
Exception thrown when a parse expression doesn't match the input string
Example::
try:
Word(nums).set_name("integer").parse_string("ABC")
except ParseException as pe:
print(pe)
print("column: {}".format(pe.column))
prints::
Expected integer (at char 0), (line:1, col:1)
column: 1
"""
class ParseFatalException(ParseBaseException):
"""
User-throwable exception thrown when inconsistent parse content
is found; stops all parsing immediately
"""
class ParseSyntaxException(ParseFatalException):
"""
Just like :class:`ParseFatalException`, but thrown internally
when an :class:`ErrorStop<And._ErrorStop>` ('-' operator) indicates
that parsing is to stop immediately because an unbacktrackable
syntax error has been found.
"""
class RecursiveGrammarException(Exception):
"""
Exception thrown by :class:`ParserElement.validate` if the
grammar could be left-recursive; parser may need to enable
left recursion using :class:`ParserElement.enable_left_recursion<ParserElement.enable_left_recursion>`
"""
def __init__(self, parseElementList):
self.parseElementTrace = parseElementList
def __str__(self) -> str:
return f"RecursiveGrammarException: {self.parseElementTrace}"

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# testing.py
from contextlib import contextmanager
import typing
from .core import (
ParserElement,
ParseException,
Keyword,
__diag__,
__compat__,
)
class pyparsing_test:
"""
namespace class for classes useful in writing unit tests
"""
class reset_pyparsing_context:
"""
Context manager to be used when writing unit tests that modify pyparsing config values:
- packrat parsing
- bounded recursion parsing
- default whitespace characters.
- default keyword characters
- literal string auto-conversion class
- __diag__ settings
Example::
with reset_pyparsing_context():
# test that literals used to construct a grammar are automatically suppressed
ParserElement.inlineLiteralsUsing(Suppress)
term = Word(alphas) | Word(nums)
group = Group('(' + term[...] + ')')
# assert that the '()' characters are not included in the parsed tokens
self.assertParseAndCheckList(group, "(abc 123 def)", ['abc', '123', 'def'])
# after exiting context manager, literals are converted to Literal expressions again
"""
def __init__(self):
self._save_context = {}
def save(self):
self._save_context["default_whitespace"] = ParserElement.DEFAULT_WHITE_CHARS
self._save_context["default_keyword_chars"] = Keyword.DEFAULT_KEYWORD_CHARS
self._save_context[
"literal_string_class"
] = ParserElement._literalStringClass
self._save_context["verbose_stacktrace"] = ParserElement.verbose_stacktrace
self._save_context["packrat_enabled"] = ParserElement._packratEnabled
if ParserElement._packratEnabled:
self._save_context[
"packrat_cache_size"
] = ParserElement.packrat_cache.size
else:
self._save_context["packrat_cache_size"] = None
self._save_context["packrat_parse"] = ParserElement._parse
self._save_context[
"recursion_enabled"
] = ParserElement._left_recursion_enabled
self._save_context["__diag__"] = {
name: getattr(__diag__, name) for name in __diag__._all_names
}
self._save_context["__compat__"] = {
"collect_all_And_tokens": __compat__.collect_all_And_tokens
}
return self
def restore(self):
# reset pyparsing global state
if (
ParserElement.DEFAULT_WHITE_CHARS
!= self._save_context["default_whitespace"]
):
ParserElement.set_default_whitespace_chars(
self._save_context["default_whitespace"]
)
ParserElement.verbose_stacktrace = self._save_context["verbose_stacktrace"]
Keyword.DEFAULT_KEYWORD_CHARS = self._save_context["default_keyword_chars"]
ParserElement.inlineLiteralsUsing(
self._save_context["literal_string_class"]
)
for name, value in self._save_context["__diag__"].items():
(__diag__.enable if value else __diag__.disable)(name)
ParserElement._packratEnabled = False
if self._save_context["packrat_enabled"]:
ParserElement.enable_packrat(self._save_context["packrat_cache_size"])
else:
ParserElement._parse = self._save_context["packrat_parse"]
ParserElement._left_recursion_enabled = self._save_context[
"recursion_enabled"
]
__compat__.collect_all_And_tokens = self._save_context["__compat__"]
return self
def copy(self):
ret = type(self)()
ret._save_context.update(self._save_context)
return ret
def __enter__(self):
return self.save()
def __exit__(self, *args):
self.restore()
class TestParseResultsAsserts:
"""
A mixin class to add parse results assertion methods to normal unittest.TestCase classes.
"""
def assertParseResultsEquals(
self, result, expected_list=None, expected_dict=None, msg=None
):
"""
Unit test assertion to compare a :class:`ParseResults` object with an optional ``expected_list``,
and compare any defined results names with an optional ``expected_dict``.
"""
if expected_list is not None:
self.assertEqual(expected_list, result.as_list(), msg=msg)
if expected_dict is not None:
self.assertEqual(expected_dict, result.as_dict(), msg=msg)
def assertParseAndCheckList(
self, expr, test_string, expected_list, msg=None, verbose=True
):
"""
Convenience wrapper assert to test a parser element and input string, and assert that
the resulting ``ParseResults.asList()`` is equal to the ``expected_list``.
"""
result = expr.parse_string(test_string, parse_all=True)
if verbose:
print(result.dump())
else:
print(result.as_list())
self.assertParseResultsEquals(result, expected_list=expected_list, msg=msg)
def assertParseAndCheckDict(
self, expr, test_string, expected_dict, msg=None, verbose=True
):
"""
Convenience wrapper assert to test a parser element and input string, and assert that
the resulting ``ParseResults.asDict()`` is equal to the ``expected_dict``.
"""
result = expr.parse_string(test_string, parseAll=True)
if verbose:
print(result.dump())
else:
print(result.as_list())
self.assertParseResultsEquals(result, expected_dict=expected_dict, msg=msg)
def assertRunTestResults(
self, run_tests_report, expected_parse_results=None, msg=None
):
"""
Unit test assertion to evaluate output of ``ParserElement.runTests()``. If a list of
list-dict tuples is given as the ``expected_parse_results`` argument, then these are zipped
with the report tuples returned by ``runTests`` and evaluated using ``assertParseResultsEquals``.
Finally, asserts that the overall ``runTests()`` success value is ``True``.
:param run_tests_report: tuple(bool, [tuple(str, ParseResults or Exception)]) returned from runTests
:param expected_parse_results (optional): [tuple(str, list, dict, Exception)]
"""
run_test_success, run_test_results = run_tests_report
if expected_parse_results is not None:
merged = [
(*rpt, expected)
for rpt, expected in zip(run_test_results, expected_parse_results)
]
for test_string, result, expected in merged:
# expected should be a tuple containing a list and/or a dict or an exception,
# and optional failure message string
# an empty tuple will skip any result validation
fail_msg = next(
(exp for exp in expected if isinstance(exp, str)), None
)
expected_exception = next(
(
exp
for exp in expected
if isinstance(exp, type) and issubclass(exp, Exception)
),
None,
)
if expected_exception is not None:
with self.assertRaises(
expected_exception=expected_exception, msg=fail_msg or msg
):
if isinstance(result, Exception):
raise result
else:
expected_list = next(
(exp for exp in expected if isinstance(exp, list)), None
)
expected_dict = next(
(exp for exp in expected if isinstance(exp, dict)), None
)
if (expected_list, expected_dict) != (None, None):
self.assertParseResultsEquals(
result,
expected_list=expected_list,
expected_dict=expected_dict,
msg=fail_msg or msg,
)
else:
# warning here maybe?
print(f"no validation for {test_string!r}")
# do this last, in case some specific test results can be reported instead
self.assertTrue(
run_test_success, msg=msg if msg is not None else "failed runTests"
)
@contextmanager
def assertRaisesParseException(self, exc_type=ParseException, msg=None):
with self.assertRaises(exc_type, msg=msg):
yield
@staticmethod
def with_line_numbers(
s: str,
start_line: typing.Optional[int] = None,
end_line: typing.Optional[int] = None,
expand_tabs: bool = True,
eol_mark: str = "|",
mark_spaces: typing.Optional[str] = None,
mark_control: typing.Optional[str] = None,
) -> str:
"""
Helpful method for debugging a parser - prints a string with line and column numbers.
(Line and column numbers are 1-based.)
:param s: tuple(bool, str - string to be printed with line and column numbers
:param start_line: int - (optional) starting line number in s to print (default=1)
:param end_line: int - (optional) ending line number in s to print (default=len(s))
:param expand_tabs: bool - (optional) expand tabs to spaces, to match the pyparsing default
:param eol_mark: str - (optional) string to mark the end of lines, helps visualize trailing spaces (default="|")
:param mark_spaces: str - (optional) special character to display in place of spaces
:param mark_control: str - (optional) convert non-printing control characters to a placeholding
character; valid values:
- "unicode" - replaces control chars with Unicode symbols, such as "␍" and "␊"
- any single character string - replace control characters with given string
- None (default) - string is displayed as-is
:return: str - input string with leading line numbers and column number headers
"""
if expand_tabs:
s = s.expandtabs()
if mark_control is not None:
mark_control = typing.cast(str, mark_control)
if mark_control == "unicode":
transtable_map = {
c: u for c, u in zip(range(0, 33), range(0x2400, 0x2433))
}
transtable_map[127] = 0x2421
tbl = str.maketrans(transtable_map)
eol_mark = ""
else:
ord_mark_control = ord(mark_control)
tbl = str.maketrans(
{c: ord_mark_control for c in list(range(0, 32)) + [127]}
)
s = s.translate(tbl)
if mark_spaces is not None and mark_spaces != " ":
if mark_spaces == "unicode":
tbl = str.maketrans({9: 0x2409, 32: 0x2423})
s = s.translate(tbl)
else:
s = s.replace(" ", mark_spaces)
if start_line is None:
start_line = 1
if end_line is None:
end_line = len(s)
end_line = min(end_line, len(s))
start_line = min(max(1, start_line), end_line)
if mark_control != "unicode":
s_lines = s.splitlines()[start_line - 1 : end_line]
else:
s_lines = [line + "␊" for line in s.split("␊")[start_line - 1 : end_line]]
if not s_lines:
return ""
lineno_width = len(str(end_line))
max_line_len = max(len(line) for line in s_lines)
lead = " " * (lineno_width + 1)
if max_line_len >= 99:
header0 = (
lead
+ "".join(
f"{' ' * 99}{(i + 1) % 100}"
for i in range(max(max_line_len // 100, 1))
)
+ "\n"
)
else:
header0 = ""
header1 = (
header0
+ lead
+ "".join(f" {(i + 1) % 10}" for i in range(-(-max_line_len // 10)))
+ "\n"
)
header2 = lead + "1234567890" * (-(-max_line_len // 10)) + "\n"
return (
header1
+ header2
+ "\n".join(
f"{i:{lineno_width}d}:{line}{eol_mark}"
for i, line in enumerate(s_lines, start=start_line)
)
+ "\n"
)

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# unicode.py
import sys
from itertools import filterfalse
from typing import List, Tuple, Union
class _lazyclassproperty:
def __init__(self, fn):
self.fn = fn
self.__doc__ = fn.__doc__
self.__name__ = fn.__name__
def __get__(self, obj, cls):
if cls is None:
cls = type(obj)
if not hasattr(cls, "_intern") or any(
cls._intern is getattr(superclass, "_intern", [])
for superclass in cls.__mro__[1:]
):
cls._intern = {}
attrname = self.fn.__name__
if attrname not in cls._intern:
cls._intern[attrname] = self.fn(cls)
return cls._intern[attrname]
UnicodeRangeList = List[Union[Tuple[int, int], Tuple[int]]]
class unicode_set:
"""
A set of Unicode characters, for language-specific strings for
``alphas``, ``nums``, ``alphanums``, and ``printables``.
A unicode_set is defined by a list of ranges in the Unicode character
set, in a class attribute ``_ranges``. Ranges can be specified using
2-tuples or a 1-tuple, such as::
_ranges = [
(0x0020, 0x007e),
(0x00a0, 0x00ff),
(0x0100,),
]
Ranges are left- and right-inclusive. A 1-tuple of (x,) is treated as (x, x).
A unicode set can also be defined using multiple inheritance of other unicode sets::
class CJK(Chinese, Japanese, Korean):
pass
"""
_ranges: UnicodeRangeList = []
@_lazyclassproperty
def _chars_for_ranges(cls):
ret = []
for cc in cls.__mro__:
if cc is unicode_set:
break
for rr in getattr(cc, "_ranges", ()):
ret.extend(range(rr[0], rr[-1] + 1))
return [chr(c) for c in sorted(set(ret))]
@_lazyclassproperty
def printables(cls):
"""all non-whitespace characters in this range"""
return "".join(filterfalse(str.isspace, cls._chars_for_ranges))
@_lazyclassproperty
def alphas(cls):
"""all alphabetic characters in this range"""
return "".join(filter(str.isalpha, cls._chars_for_ranges))
@_lazyclassproperty
def nums(cls):
"""all numeric digit characters in this range"""
return "".join(filter(str.isdigit, cls._chars_for_ranges))
@_lazyclassproperty
def alphanums(cls):
"""all alphanumeric characters in this range"""
return cls.alphas + cls.nums
@_lazyclassproperty
def identchars(cls):
"""all characters in this range that are valid identifier characters, plus underscore '_'"""
return "".join(
sorted(
set(
"".join(filter(str.isidentifier, cls._chars_for_ranges))
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzªµº"
+ "ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿ"
+ "_"
)
)
)
@_lazyclassproperty
def identbodychars(cls):
"""
all characters in this range that are valid identifier body characters,
plus the digits 0-9, and · (Unicode MIDDLE DOT)
"""
return "".join(
sorted(
set(
cls.identchars
+ "0123456789·"
+ "".join(
[c for c in cls._chars_for_ranges if ("_" + c).isidentifier()]
)
)
)
)
@_lazyclassproperty
def identifier(cls):
"""
a pyparsing Word expression for an identifier using this range's definitions for
identchars and identbodychars
"""
from pip._vendor.pyparsing import Word
return Word(cls.identchars, cls.identbodychars)
class pyparsing_unicode(unicode_set):
"""
A namespace class for defining common language unicode_sets.
"""
# fmt: off
# define ranges in language character sets
_ranges: UnicodeRangeList = [
(0x0020, sys.maxunicode),
]
class BasicMultilingualPlane(unicode_set):
"""Unicode set for the Basic Multilingual Plane"""
_ranges: UnicodeRangeList = [
(0x0020, 0xFFFF),
]
class Latin1(unicode_set):
"""Unicode set for Latin-1 Unicode Character Range"""
_ranges: UnicodeRangeList = [
(0x0020, 0x007E),
(0x00A0, 0x00FF),
]
class LatinA(unicode_set):
"""Unicode set for Latin-A Unicode Character Range"""
_ranges: UnicodeRangeList = [
(0x0100, 0x017F),
]
class LatinB(unicode_set):
"""Unicode set for Latin-B Unicode Character Range"""
_ranges: UnicodeRangeList = [
(0x0180, 0x024F),
]
class Greek(unicode_set):
"""Unicode set for Greek Unicode Character Ranges"""
_ranges: UnicodeRangeList = [
(0x0342, 0x0345),
(0x0370, 0x0377),
(0x037A, 0x037F),
(0x0384, 0x038A),
(0x038C,),
(0x038E, 0x03A1),
(0x03A3, 0x03E1),
(0x03F0, 0x03FF),
(0x1D26, 0x1D2A),
(0x1D5E,),
(0x1D60,),
(0x1D66, 0x1D6A),
(0x1F00, 0x1F15),
(0x1F18, 0x1F1D),
(0x1F20, 0x1F45),
(0x1F48, 0x1F4D),
(0x1F50, 0x1F57),
(0x1F59,),
(0x1F5B,),
(0x1F5D,),
(0x1F5F, 0x1F7D),
(0x1F80, 0x1FB4),
(0x1FB6, 0x1FC4),
(0x1FC6, 0x1FD3),
(0x1FD6, 0x1FDB),
(0x1FDD, 0x1FEF),
(0x1FF2, 0x1FF4),
(0x1FF6, 0x1FFE),
(0x2129,),
(0x2719, 0x271A),
(0xAB65,),
(0x10140, 0x1018D),
(0x101A0,),
(0x1D200, 0x1D245),
(0x1F7A1, 0x1F7A7),
]
class Cyrillic(unicode_set):
"""Unicode set for Cyrillic Unicode Character Range"""
_ranges: UnicodeRangeList = [
(0x0400, 0x052F),
(0x1C80, 0x1C88),
(0x1D2B,),
(0x1D78,),
(0x2DE0, 0x2DFF),
(0xA640, 0xA672),
(0xA674, 0xA69F),
(0xFE2E, 0xFE2F),
]
class Chinese(unicode_set):
"""Unicode set for Chinese Unicode Character Range"""
_ranges: UnicodeRangeList = [
(0x2E80, 0x2E99),
(0x2E9B, 0x2EF3),
(0x31C0, 0x31E3),
(0x3400, 0x4DB5),
(0x4E00, 0x9FEF),
(0xA700, 0xA707),
(0xF900, 0xFA6D),
(0xFA70, 0xFAD9),
(0x16FE2, 0x16FE3),
(0x1F210, 0x1F212),
(0x1F214, 0x1F23B),
(0x1F240, 0x1F248),
(0x20000, 0x2A6D6),
(0x2A700, 0x2B734),
(0x2B740, 0x2B81D),
(0x2B820, 0x2CEA1),
(0x2CEB0, 0x2EBE0),
(0x2F800, 0x2FA1D),
]
class Japanese(unicode_set):
"""Unicode set for Japanese Unicode Character Range, combining Kanji, Hiragana, and Katakana ranges"""
class Kanji(unicode_set):
"Unicode set for Kanji Unicode Character Range"
_ranges: UnicodeRangeList = [
(0x4E00, 0x9FBF),
(0x3000, 0x303F),
]
class Hiragana(unicode_set):
"""Unicode set for Hiragana Unicode Character Range"""
_ranges: UnicodeRangeList = [
(0x3041, 0x3096),
(0x3099, 0x30A0),
(0x30FC,),
(0xFF70,),
(0x1B001,),
(0x1B150, 0x1B152),
(0x1F200,),
]
class Katakana(unicode_set):
"""Unicode set for Katakana Unicode Character Range"""
_ranges: UnicodeRangeList = [
(0x3099, 0x309C),
(0x30A0, 0x30FF),
(0x31F0, 0x31FF),
(0x32D0, 0x32FE),
(0xFF65, 0xFF9F),
(0x1B000,),
(0x1B164, 0x1B167),
(0x1F201, 0x1F202),
(0x1F213,),
]
漢字 = Kanji
カタカナ = Katakana
ひらがな = Hiragana
_ranges = (
Kanji._ranges
+ Hiragana._ranges
+ Katakana._ranges
)
class Hangul(unicode_set):
"""Unicode set for Hangul (Korean) Unicode Character Range"""
_ranges: UnicodeRangeList = [
(0x1100, 0x11FF),
(0x302E, 0x302F),
(0x3131, 0x318E),
(0x3200, 0x321C),
(0x3260, 0x327B),
(0x327E,),
(0xA960, 0xA97C),
(0xAC00, 0xD7A3),
(0xD7B0, 0xD7C6),
(0xD7CB, 0xD7FB),
(0xFFA0, 0xFFBE),
(0xFFC2, 0xFFC7),
(0xFFCA, 0xFFCF),
(0xFFD2, 0xFFD7),
(0xFFDA, 0xFFDC),
]
Korean = Hangul
class CJK(Chinese, Japanese, Hangul):
"""Unicode set for combined Chinese, Japanese, and Korean (CJK) Unicode Character Range"""
class Thai(unicode_set):
"""Unicode set for Thai Unicode Character Range"""
_ranges: UnicodeRangeList = [
(0x0E01, 0x0E3A),
(0x0E3F, 0x0E5B)
]
class Arabic(unicode_set):
"""Unicode set for Arabic Unicode Character Range"""
_ranges: UnicodeRangeList = [
(0x0600, 0x061B),
(0x061E, 0x06FF),
(0x0700, 0x077F),
]
class Hebrew(unicode_set):
"""Unicode set for Hebrew Unicode Character Range"""
_ranges: UnicodeRangeList = [
(0x0591, 0x05C7),
(0x05D0, 0x05EA),
(0x05EF, 0x05F4),
(0xFB1D, 0xFB36),
(0xFB38, 0xFB3C),
(0xFB3E,),
(0xFB40, 0xFB41),
(0xFB43, 0xFB44),
(0xFB46, 0xFB4F),
]
class Devanagari(unicode_set):
"""Unicode set for Devanagari Unicode Character Range"""
_ranges: UnicodeRangeList = [
(0x0900, 0x097F),
(0xA8E0, 0xA8FF)
]
BMP = BasicMultilingualPlane
# add language identifiers using language Unicode
العربية = Arabic
中文 = Chinese
кириллица = Cyrillic
Ελληνικά = Greek
עִברִית = Hebrew
日本語 = Japanese
한국어 = Korean
ไทย = Thai
देवनागरी = Devanagari
# fmt: on

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# util.py
import inspect
import warnings
import types
import collections
import itertools
from functools import lru_cache, wraps
from typing import Callable, List, Union, Iterable, TypeVar, cast
_bslash = chr(92)
C = TypeVar("C", bound=Callable)
class __config_flags:
"""Internal class for defining compatibility and debugging flags"""
_all_names: List[str] = []
_fixed_names: List[str] = []
_type_desc = "configuration"
@classmethod
def _set(cls, dname, value):
if dname in cls._fixed_names:
warnings.warn(
f"{cls.__name__}.{dname} {cls._type_desc} is {str(getattr(cls, dname)).upper()}"
f" and cannot be overridden",
stacklevel=3,
)
return
if dname in cls._all_names:
setattr(cls, dname, value)
else:
raise ValueError(f"no such {cls._type_desc} {dname!r}")
enable = classmethod(lambda cls, name: cls._set(name, True))
disable = classmethod(lambda cls, name: cls._set(name, False))
@lru_cache(maxsize=128)
def col(loc: int, strg: str) -> int:
"""
Returns current column within a string, counting newlines as line separators.
The first column is number 1.
Note: the default parsing behavior is to expand tabs in the input string
before starting the parsing process. See
:class:`ParserElement.parse_string` for more
information on parsing strings containing ``<TAB>`` s, and suggested
methods to maintain a consistent view of the parsed string, the parse
location, and line and column positions within the parsed string.
"""
s = strg
return 1 if 0 < loc < len(s) and s[loc - 1] == "\n" else loc - s.rfind("\n", 0, loc)
@lru_cache(maxsize=128)
def lineno(loc: int, strg: str) -> int:
"""Returns current line number within a string, counting newlines as line separators.
The first line is number 1.
Note - the default parsing behavior is to expand tabs in the input string
before starting the parsing process. See :class:`ParserElement.parse_string`
for more information on parsing strings containing ``<TAB>`` s, and
suggested methods to maintain a consistent view of the parsed string, the
parse location, and line and column positions within the parsed string.
"""
return strg.count("\n", 0, loc) + 1
@lru_cache(maxsize=128)
def line(loc: int, strg: str) -> str:
"""
Returns the line of text containing loc within a string, counting newlines as line separators.
"""
last_cr = strg.rfind("\n", 0, loc)
next_cr = strg.find("\n", loc)
return strg[last_cr + 1 : next_cr] if next_cr >= 0 else strg[last_cr + 1 :]
class _UnboundedCache:
def __init__(self):
cache = {}
cache_get = cache.get
self.not_in_cache = not_in_cache = object()
def get(_, key):
return cache_get(key, not_in_cache)
def set_(_, key, value):
cache[key] = value
def clear(_):
cache.clear()
self.size = None
self.get = types.MethodType(get, self)
self.set = types.MethodType(set_, self)
self.clear = types.MethodType(clear, self)
class _FifoCache:
def __init__(self, size):
self.not_in_cache = not_in_cache = object()
cache = {}
keyring = [object()] * size
cache_get = cache.get
cache_pop = cache.pop
keyiter = itertools.cycle(range(size))
def get(_, key):
return cache_get(key, not_in_cache)
def set_(_, key, value):
cache[key] = value
i = next(keyiter)
cache_pop(keyring[i], None)
keyring[i] = key
def clear(_):
cache.clear()
keyring[:] = [object()] * size
self.size = size
self.get = types.MethodType(get, self)
self.set = types.MethodType(set_, self)
self.clear = types.MethodType(clear, self)
class LRUMemo:
"""
A memoizing mapping that retains `capacity` deleted items
The memo tracks retained items by their access order; once `capacity` items
are retained, the least recently used item is discarded.
"""
def __init__(self, capacity):
self._capacity = capacity
self._active = {}
self._memory = collections.OrderedDict()
def __getitem__(self, key):
try:
return self._active[key]
except KeyError:
self._memory.move_to_end(key)
return self._memory[key]
def __setitem__(self, key, value):
self._memory.pop(key, None)
self._active[key] = value
def __delitem__(self, key):
try:
value = self._active.pop(key)
except KeyError:
pass
else:
while len(self._memory) >= self._capacity:
self._memory.popitem(last=False)
self._memory[key] = value
def clear(self):
self._active.clear()
self._memory.clear()
class UnboundedMemo(dict):
"""
A memoizing mapping that retains all deleted items
"""
def __delitem__(self, key):
pass
def _escape_regex_range_chars(s: str) -> str:
# escape these chars: ^-[]
for c in r"\^-[]":
s = s.replace(c, _bslash + c)
s = s.replace("\n", r"\n")
s = s.replace("\t", r"\t")
return str(s)
def _collapse_string_to_ranges(
s: Union[str, Iterable[str]], re_escape: bool = True
) -> str:
def is_consecutive(c):
c_int = ord(c)
is_consecutive.prev, prev = c_int, is_consecutive.prev
if c_int - prev > 1:
is_consecutive.value = next(is_consecutive.counter)
return is_consecutive.value
is_consecutive.prev = 0 # type: ignore [attr-defined]
is_consecutive.counter = itertools.count() # type: ignore [attr-defined]
is_consecutive.value = -1 # type: ignore [attr-defined]
def escape_re_range_char(c):
return "\\" + c if c in r"\^-][" else c
def no_escape_re_range_char(c):
return c
if not re_escape:
escape_re_range_char = no_escape_re_range_char
ret = []
s = "".join(sorted(set(s)))
if len(s) > 3:
for _, chars in itertools.groupby(s, key=is_consecutive):
first = last = next(chars)
last = collections.deque(
itertools.chain(iter([last]), chars), maxlen=1
).pop()
if first == last:
ret.append(escape_re_range_char(first))
else:
sep = "" if ord(last) == ord(first) + 1 else "-"
ret.append(
f"{escape_re_range_char(first)}{sep}{escape_re_range_char(last)}"
)
else:
ret = [escape_re_range_char(c) for c in s]
return "".join(ret)
def _flatten(ll: list) -> list:
ret = []
for i in ll:
if isinstance(i, list):
ret.extend(_flatten(i))
else:
ret.append(i)
return ret
def _make_synonym_function(compat_name: str, fn: C) -> C:
# In a future version, uncomment the code in the internal _inner() functions
# to begin emitting DeprecationWarnings.
# Unwrap staticmethod/classmethod
fn = getattr(fn, "__func__", fn)
# (Presence of 'self' arg in signature is used by explain_exception() methods, so we take
# some extra steps to add it if present in decorated function.)
if "self" == list(inspect.signature(fn).parameters)[0]:
@wraps(fn)
def _inner(self, *args, **kwargs):
# warnings.warn(
# f"Deprecated - use {fn.__name__}", DeprecationWarning, stacklevel=3
# )
return fn(self, *args, **kwargs)
else:
@wraps(fn)
def _inner(*args, **kwargs):
# warnings.warn(
# f"Deprecated - use {fn.__name__}", DeprecationWarning, stacklevel=3
# )
return fn(*args, **kwargs)
_inner.__doc__ = f"""Deprecated - use :class:`{fn.__name__}`"""
_inner.__name__ = compat_name
_inner.__annotations__ = fn.__annotations__
if isinstance(fn, types.FunctionType):
_inner.__kwdefaults__ = fn.__kwdefaults__
elif isinstance(fn, type) and hasattr(fn, "__init__"):
_inner.__kwdefaults__ = fn.__init__.__kwdefaults__
else:
_inner.__kwdefaults__ = None
_inner.__qualname__ = fn.__qualname__
return cast(C, _inner)
def replaced_by_pep8(fn: C) -> Callable[[Callable], C]:
"""
Decorator for pre-PEP8 compatibility synonyms, to link them to the new function.
"""
return lambda other: _make_synonym_function(other.__name__, fn)