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Use unicodedata instead of eval.

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This commit is contained in:
Serhiy Storchaka 2018-02-08 18:51:45 +02:00
parent c0a268962a
commit 2272cec13b
1 changed files with 22 additions and 26 deletions
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48
Lib/sre_parse.py
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@ -13,7 +13,7 @@
# XXX: show string offset and offending character for all errors
from sre_constants import *
from ast import literal_eval
import unicodedata
SPECIAL_CHARS = ".\\[{()*+?^$|"
REPEAT_CHARS = "*+?{"
@ -26,10 +26,6 @@
WHITESPACE = frozenset(" \t\n\r\v\f")
UNICODE_NAME = ASCIILETTERS | DIGITS | frozenset(' -')
CLOSING_BRACE = frozenset("}")
OPENING_BRACE = frozenset("{")
_REPEATCODES = frozenset({MIN_REPEAT, MAX_REPEAT})
_UNITCODES = frozenset({ANY, RANGE, IN, LITERAL, NOT_LITERAL, CATEGORY})
@ -270,19 +266,19 @@ def getwhile(self, n, charset):
result += c
self.__next()
return result
def getuntil(self, terminator):
def getuntil(self, terminator, name):
result = ''
while True:
c = self.next
self.__next()
if c is None:
if not result:
raise self.error("missing group name")
raise self.error("missing " + name)
raise self.error("missing %s, unterminated name" % terminator,
len(result))
if c == terminator:
if not result:
raise self.error("missing group name", 1)
raise self.error("missing " + name, 1)
break
result += c
return result
@ -330,14 +326,14 @@ def _class_escape(source, escape):
return LITERAL, c
elif c == "N" and source.istext:
# named unicode escape e.g. \N{EM DASH}
escape += source.getwhile(1, OPENING_BRACE)
escape += source.getwhile(100, UNICODE_NAME)
escape += source.getwhile(1, CLOSING_BRACE)
if not source.match('{'):
raise source.error("missing {")
charname = source.getuntil('}', 'character name')
try:
c = ord(literal_eval('"%s"' % escape))
except SyntaxError:
charname = escape[2:].strip('{}')
raise source.error("unknown Unicode character name %s" % charname, len(escape))
c = ord(unicodedata.lookup(charname))
except KeyError:
raise source.error("undefined character name %r" % charname,
len(charname) + len(r'\N{}'))
return LITERAL, c
elif c in OCTDIGITS:
# octal escape (up to three digits)
@ -389,14 +385,14 @@ def _escape(source, escape, state):
return LITERAL, c
elif c == "N" and source.istext:
# named unicode escape e.g. \N{EM DASH}
escape += source.getwhile(1, OPENING_BRACE)
escape += source.getwhile(100, UNICODE_NAME)
escape += source.getwhile(1, CLOSING_BRACE)
if not source.match('{'):
raise source.error("missing {")
charname = source.getuntil('}', 'character name')
try:
c = ord(literal_eval('"%s"' % escape))
except SyntaxError:
charname = escape[2:].strip('{}')
raise source.error("unknown Unicode character name %s" % charname, len(escape))
c = ord(unicodedata.lookup(charname))
except KeyError:
raise source.error("undefined character name %r" % charname,
len(charname) + len(r'\N{}'))
return LITERAL, c
elif c == "0":
# octal escape
@ -707,13 +703,13 @@ def _parse(source, state, verbose, nested, first=False):
# python extensions
if sourcematch("<"):
# named group: skip forward to end of name
name = source.getuntil(">")
name = source.getuntil(">", "group name")
if not name.isidentifier():
msg = "bad character in group name %r" % name
raise source.error(msg, len(name) + 1)
elif sourcematch("="):
# named backreference
name = source.getuntil(")")
name = source.getuntil(")", "group name")
if not name.isidentifier():
msg = "bad character in group name %r" % name
raise source.error(msg, len(name) + 1)
@ -776,7 +772,7 @@ def _parse(source, state, verbose, nested, first=False):
elif char == "(":
# conditional backreference group
condname = source.getuntil(")")
condname = source.getuntil(")", "group name")
if condname.isidentifier():
condgroup = state.groupdict.get(condname)
if condgroup is None:
@ -1005,7 +1001,7 @@ def addgroup(index, pos):
name = ""
if not s.match("<"):
raise s.error("missing <")
name = s.getuntil(">")
name = s.getuntil(">", "group name")
if name.isidentifier():
try:
index = groupindex[name]