Issue #22578: Added attributes to the re.error class.
This commit is contained in:
Serhiy Storchaka
parent
eb99e51574
commit
ad446d57a9
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@ -733,13 +733,36 @@ form.
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Clear the regular expression cache.
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.. exception:: error
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.. exception:: error(msg, pattern=None, pos=None)
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Exception raised when a string passed to one of the functions here is not a
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valid regular expression (for example, it might contain unmatched parentheses)
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or when some other error occurs during compilation or matching. It is never an
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error if a string contains no match for a pattern.
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error if a string contains no match for a pattern. The error instance has
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the following additional attributes:
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.. attribute:: msg
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The unformatted error message.
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.. attribute:: pattern
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The regular expression pattern.
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.. attribute:: pos
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The index of *pattern* where compilation failed.
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.. attribute:: lineno
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The line corresponding to *pos*.
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.. attribute:: colno
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The column corresponding to *pos*.
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.. versionchanged:: 3.5
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Added additional attributes.
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.. _re-objects:
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@ -21,7 +21,35 @@ from _sre import MAXREPEAT, MAXGROUPS
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# should this really be here?
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class error(Exception):
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pass
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def __init__(self, msg, pattern=None, pos=None):
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self.msg = msg
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self.pattern = pattern
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self.pos = pos
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if pattern is not None and pos is not None:
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msg = '%s at position %d' % (msg, pos)
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if isinstance(pattern, str):
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newline = '\n'
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else:
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newline = b'\n'
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self.lineno = pattern.count(newline, 0, pos) + 1
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self.colno = pos - pattern.rfind(newline, 0, pos)
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if newline in pattern:
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msg = '%s (line %d, column %d)' % (msg, self.lineno, self.colno)
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else:
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self.lineno = self.colno = None
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super().__init__(msg)
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def linecol(doc, pos):
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if isinstance(pattern, str):
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newline = '\n'
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else:
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newline = b'\n'
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lineno = pattern.count(newline, 0, pos) + 1
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if lineno == 1:
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colno = pos + 1
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else:
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colno = pos - doc.rindex(newline, 0, pos)
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return lineno, colno
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class _NamedIntConstant(int):
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139
Lib/sre_parse.py
139
Lib/sre_parse.py
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@ -81,8 +81,8 @@ class Pattern:
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if name is not None:
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ogid = self.groupdict.get(name, None)
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if ogid is not None:
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raise error("redefinition of group name %s as group %d; "
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"was group %d" % (repr(name), gid, ogid))
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raise error("redefinition of group name %r as group %d; "
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"was group %d" % (name, gid, ogid))
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self.groupdict[name] = gid
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return gid
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def closegroup(self, gid, p):
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@ -206,24 +206,25 @@ class SubPattern:
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class Tokenizer:
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def __init__(self, string):
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self.istext = isinstance(string, str)
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self.string = string
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if not self.istext:
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string = str(string, 'latin1')
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self.string = string
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self.decoded_string = string
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self.index = 0
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self.__next()
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def __next(self):
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index = self.index
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try:
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char = self.string[index]
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char = self.decoded_string[index]
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except IndexError:
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self.next = None
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return
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if char == "\\":
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index += 1
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try:
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char += self.string[index]
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char += self.decoded_string[index]
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except IndexError:
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raise error("bogus escape (end of line)")
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raise self.error("bogus escape (end of line)") from None
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self.index = index + 1
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self.next = char
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def match(self, char):
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@ -250,15 +251,19 @@ class Tokenizer:
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c = self.next
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self.__next()
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if c is None:
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raise error("unterminated name")
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raise self.error("unterminated name")
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if c == terminator:
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break
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result += c
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return result
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def tell(self):
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return self.index, self.next
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return self.index - len(self.next or '')
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def seek(self, index):
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self.index, self.next = index
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self.index = index
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self.__next()
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def error(self, msg, offset=0):
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return error(msg, self.string, self.tell() - offset)
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# The following three functions are not used in this module anymore, but we keep
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# them here (with DeprecationWarnings) for backwards compatibility.
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@ -322,8 +327,8 @@ def _class_escape(source, escape):
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escape += source.getwhile(2, OCTDIGITS)
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c = int(escape[1:], 8)
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if c > 0o377:
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raise error('octal escape value %r outside of '
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'range 0-0o377' % escape)
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raise source.error('octal escape value %r outside of '
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'range 0-0o377' % escape, len(escape))
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return LITERAL, c
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elif c in DIGITS:
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raise ValueError
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@ -331,7 +336,7 @@ def _class_escape(source, escape):
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return LITERAL, ord(escape[1])
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except ValueError:
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pass
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raise error("bogus escape: %s" % repr(escape))
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raise source.error("bogus escape: %r" % escape, len(escape))
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def _escape(source, escape, state):
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# handle escape code in expression
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@ -377,21 +382,23 @@ def _escape(source, escape, state):
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escape += source.get()
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c = int(escape[1:], 8)
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if c > 0o377:
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raise error('octal escape value %r outside of '
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'range 0-0o377' % escape)
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raise source.error('octal escape value %r outside of '
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'range 0-0o377' % escape,
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len(escape))
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return LITERAL, c
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# not an octal escape, so this is a group reference
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group = int(escape[1:])
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if group < state.groups:
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if not state.checkgroup(group):
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raise error("cannot refer to open group")
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raise source.error("cannot refer to open group",
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len(escape))
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return GROUPREF, group
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raise ValueError
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if len(escape) == 2:
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return LITERAL, ord(escape[1])
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except ValueError:
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pass
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raise error("bogus escape: %s" % repr(escape))
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raise source.error("bogus escape: %r" % escape, len(escape))
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def _parse_sub(source, state, nested=True):
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# parse an alternation: a|b|c
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@ -404,7 +411,7 @@ def _parse_sub(source, state, nested=True):
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if not sourcematch("|"):
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break
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if nested and source.next is not None and source.next != ")":
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raise error("pattern not properly closed")
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raise source.error("pattern not properly closed")
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if len(items) == 1:
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return items[0]
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@ -449,11 +456,11 @@ def _parse_sub_cond(source, state, condgroup):
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if source.match("|"):
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item_no = _parse(source, state)
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if source.next == "|":
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raise error("conditional backref with more than two branches")
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raise source.error("conditional backref with more than two branches")
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else:
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item_no = None
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if source.next is not None and source.next != ")":
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raise error("pattern not properly closed")
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raise source.error("pattern not properly closed")
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subpattern = SubPattern(state)
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subpattern.append((GROUPREF_EXISTS, (condgroup, item_yes, item_no)))
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return subpattern
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@ -510,7 +517,7 @@ def _parse(source, state):
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while True:
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this = sourceget()
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if this is None:
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raise error("unexpected end of regular expression")
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raise source.error("unexpected end of regular expression")
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if this == "]" and set != start:
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break
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elif this[0] == "\\":
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@ -521,7 +528,7 @@ def _parse(source, state):
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# potential range
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this = sourceget()
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if this is None:
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raise error("unexpected end of regular expression")
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raise source.error("unexpected end of regular expression")
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if this == "]":
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if code1[0] is IN:
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code1 = code1[1][0]
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@ -533,11 +540,11 @@ def _parse(source, state):
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else:
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code2 = LITERAL, _ord(this)
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if code1[0] != LITERAL or code2[0] != LITERAL:
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raise error("bad character range")
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raise source.error("bad character range", len(this))
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lo = code1[1]
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hi = code2[1]
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if hi < lo:
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raise error("bad character range")
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raise source.error("bad character range", len(this))
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setappend((RANGE, (lo, hi)))
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else:
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if code1[0] is IN:
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@ -555,6 +562,7 @@ def _parse(source, state):
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elif this in REPEAT_CHARS:
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# repeat previous item
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here = source.tell()
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if this == "?":
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min, max = 0, 1
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elif this == "*":
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@ -566,7 +574,6 @@ def _parse(source, state):
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if source.next == "}":
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subpatternappend((LITERAL, _ord(this)))
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continue
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here = source.tell()
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min, max = 0, MAXREPEAT
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lo = hi = ""
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while source.next in DIGITS:
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@ -589,18 +596,21 @@ def _parse(source, state):
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if max >= MAXREPEAT:
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raise OverflowError("the repetition number is too large")
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if max < min:
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raise error("bad repeat interval")
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raise source.error("bad repeat interval",
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source.tell() - here)
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else:
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raise error("not supported")
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raise source.error("not supported", len(this))
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# figure out which item to repeat
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if subpattern:
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item = subpattern[-1:]
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else:
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item = None
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if not item or (_len(item) == 1 and item[0][0] == AT):
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raise error("nothing to repeat")
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raise source.error("nothing to repeat",
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source.tell() - here + len(this))
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if item[0][0] in _REPEATCODES:
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raise error("multiple repeat")
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raise source.error("multiple repeat",
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source.tell() - here + len(this))
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if sourcematch("?"):
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subpattern[-1] = (MIN_REPEAT, (min, max, item))
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else:
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@ -618,7 +628,7 @@ def _parse(source, state):
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# options
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char = sourceget()
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if char is None:
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raise error("unexpected end of pattern")
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raise self.error("unexpected end of pattern")
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if char == "P":
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# python extensions
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if sourcematch("<"):
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@ -626,28 +636,32 @@ def _parse(source, state):
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name = source.getuntil(">")
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group = 1
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if not name:
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raise error("missing group name")
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raise source.error("missing group name", 1)
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if not name.isidentifier():
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raise error("bad character in group name %r" % name)
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raise source.error("bad character in group name "
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"%r" % name,
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len(name) + 1)
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elif sourcematch("="):
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# named backreference
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name = source.getuntil(")")
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if not name:
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raise error("missing group name")
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raise source.error("missing group name", 1)
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if not name.isidentifier():
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raise error("bad character in backref group name "
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"%r" % name)
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raise source.error("bad character in backref "
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"group name %r" % name,
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len(name) + 1)
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gid = state.groupdict.get(name)
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if gid is None:
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msg = "unknown group name: {0!r}".format(name)
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raise error(msg)
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raise source.error(msg, len(name) + 1)
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subpatternappend((GROUPREF, gid))
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continue
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else:
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char = sourceget()
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if char is None:
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raise error("unexpected end of pattern")
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raise error("unknown specifier: ?P%s" % char)
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raise source.error("unexpected end of pattern")
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raise source.error("unknown specifier: ?P%s" % char,
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len(char))
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elif char == ":":
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# non-capturing group
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group = 2
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@ -655,7 +669,7 @@ def _parse(source, state):
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# comment
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while True:
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if source.next is None:
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raise error("unbalanced parenthesis")
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raise source.error("unbalanced parenthesis")
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if sourceget() == ")":
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break
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continue
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@ -665,11 +679,11 @@ def _parse(source, state):
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if char == "<":
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char = sourceget()
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if char is None or char not in "=!":
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raise error("syntax error")
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raise source.error("syntax error")
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dir = -1 # lookbehind
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p = _parse_sub(source, state)
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if not sourcematch(")"):
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raise error("unbalanced parenthesis")
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raise source.error("unbalanced parenthesis")
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if char == "=":
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subpatternappend((ASSERT, (dir, p)))
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else:
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@ -680,23 +694,26 @@ def _parse(source, state):
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condname = source.getuntil(")")
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group = 2
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if not condname:
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raise error("missing group name")
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raise source.error("missing group name", 1)
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if condname.isidentifier():
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condgroup = state.groupdict.get(condname)
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if condgroup is None:
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msg = "unknown group name: {0!r}".format(condname)
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raise error(msg)
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raise source.error(msg, len(condname) + 1)
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else:
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try:
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condgroup = int(condname)
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if condgroup < 0:
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raise ValueError
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except ValueError:
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raise error("bad character in group name")
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raise source.error("bad character in group name",
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len(condname) + 1)
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if not condgroup:
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raise error("bad group number")
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raise source.error("bad group number",
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len(condname) + 1)
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if condgroup >= MAXGROUPS:
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raise error("the group number is too large")
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raise source.error("the group number is too large",
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len(condname) + 1)
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elif char in FLAGS:
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# flags
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state.flags |= FLAGS[char]
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@ -704,20 +721,23 @@ def _parse(source, state):
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state.flags |= FLAGS[sourceget()]
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verbose = state.flags & SRE_FLAG_VERBOSE
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else:
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raise error("unexpected end of pattern " + char)
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raise source.error("unexpected end of pattern")
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if group:
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# parse group contents
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if group == 2:
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# anonymous group
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group = None
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else:
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try:
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group = state.opengroup(name)
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except error as err:
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raise source.error(err.msg, len(name) + 1)
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if condgroup:
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p = _parse_sub_cond(source, state, condgroup)
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else:
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p = _parse_sub(source, state)
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if not sourcematch(")"):
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raise error("unbalanced parenthesis")
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raise source.error("unbalanced parenthesis")
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if group is not None:
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state.closegroup(group, p)
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subpatternappend((SUBPATTERN, (group, p)))
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@ -725,10 +745,10 @@ def _parse(source, state):
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while True:
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char = sourceget()
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if char is None:
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raise error("unexpected end of pattern")
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raise source.error("unexpected end of pattern")
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if char == ")":
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break
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raise error("unknown extension")
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raise source.error("unknown extension", len(char))
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elif this == "^":
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subpatternappend((AT, AT_BEGINNING))
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@ -737,7 +757,7 @@ def _parse(source, state):
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subpattern.append((AT, AT_END))
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else:
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raise error("parser error")
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raise source.error("parser error", len(this))
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return subpattern
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@ -768,9 +788,10 @@ def parse(str, flags=0, pattern=None):
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if source.next is not None:
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if source.next == ")":
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raise error("unbalanced parenthesis")
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raise source.error("unbalanced parenthesis")
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else:
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raise error("bogus characters at end of regular expression")
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raise source.error("bogus characters at end of regular expression",
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len(tail))
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if flags & SRE_FLAG_DEBUG:
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p.dump()
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@ -809,16 +830,18 @@ def parse_template(source, pattern):
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if s.match("<"):
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name = s.getuntil(">")
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if not name:
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raise error("missing group name")
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raise s.error("missing group name", 1)
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try:
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index = int(name)
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if index < 0:
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raise error("negative group number")
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raise s.error("negative group number", len(name) + 1)
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if index >= MAXGROUPS:
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raise error("the group number is too large")
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raise s.error("the group number is too large",
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len(name) + 1)
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except ValueError:
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if not name.isidentifier():
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raise error("bad character in group name")
|
||||
raise s.error("bad character in group name",
|
||||
len(name) + 1)
|
||||
try:
|
||||
index = pattern.groupindex[name]
|
||||
except KeyError:
|
||||
|
|
@ -841,8 +864,8 @@ def parse_template(source, pattern):
|
|||
isoctal = True
|
||||
c = int(this[1:], 8)
|
||||
if c > 0o377:
|
||||
raise error('octal escape value %r outside of '
|
||||
'range 0-0o377' % this)
|
||||
raise s.error('octal escape value %r outside of '
|
||||
'range 0-0o377' % this, len(this))
|
||||
lappend(chr(c))
|
||||
if not isoctal:
|
||||
addgroup(int(this[1:]))
|
||||
|
|
|
|||
|
|
@ -1419,6 +1419,42 @@ SUBPATTERN None
|
|||
self.assertIsNone(re.match(b'(?Li)\xc5', b'\xe5'))
|
||||
self.assertIsNone(re.match(b'(?Li)\xe5', b'\xc5'))
|
||||
|
||||
def test_error(self):
|
||||
with self.assertRaises(re.error) as cm:
|
||||
re.compile('(\u20ac))')
|
||||
err = cm.exception
|
||||
self.assertIsInstance(err.pattern, str)
|
||||
self.assertEqual(err.pattern, '(\u20ac))')
|
||||
self.assertEqual(err.pos, 3)
|
||||
self.assertEqual(err.lineno, 1)
|
||||
self.assertEqual(err.colno, 4)
|
||||
self.assertIn(err.msg, str(err))
|
||||
self.assertIn(' at position 3', str(err))
|
||||
self.assertNotIn(' at position 3', err.msg)
|
||||
# Bytes pattern
|
||||
with self.assertRaises(re.error) as cm:
|
||||
re.compile(b'(\xa4))')
|
||||
err = cm.exception
|
||||
self.assertIsInstance(err.pattern, bytes)
|
||||
self.assertEqual(err.pattern, b'(\xa4))')
|
||||
self.assertEqual(err.pos, 3)
|
||||
# Multiline pattern
|
||||
with self.assertRaises(re.error) as cm:
|
||||
re.compile("""
|
||||
(
|
||||
abc
|
||||
)
|
||||
)
|
||||
(
|
||||
""", re.VERBOSE)
|
||||
err = cm.exception
|
||||
self.assertEqual(err.pos, 77)
|
||||
self.assertEqual(err.lineno, 5)
|
||||
self.assertEqual(err.colno, 17)
|
||||
self.assertIn(err.msg, str(err))
|
||||
self.assertIn(' at position 77', str(err))
|
||||
self.assertIn('(line 5, column 17)', str(err))
|
||||
|
||||
|
||||
class PatternReprTests(unittest.TestCase):
|
||||
def check(self, pattern, expected):
|
||||
|
|
|
|||
Loading…
Reference in New Issue