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?? __init__.py(1.3 KB)
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?? _compat.py(1.28 KB)
?? dnssec.py(14.44 KB)
?? e164.py(3.07 KB)
?? edns.py(4.28 KB)
?? entropy.py(4.36 KB)
?? exception.py(4.52 KB)
?? flags.py(2.6 KB)
?? grange.py(1.93 KB)
?? hash.py(1.07 KB)
?? inet.py(3.17 KB)
?? ipv4.py(1.98 KB)
?? ipv6.py(5.17 KB)
?? message.py(42.12 KB)
?? name.py(28.74 KB)
?? namedict.py(3.59 KB)
?? node.py(5.91 KB)
?? opcode.py(2.48 KB)
?? query.py(19.18 KB)
?? rcode.py(3.03 KB)
?? rdata.py(14.65 KB)
?? rdataclass.py(3.18 KB)
?? rdataset.py(11.29 KB)
?? rdatatype.py(5.21 KB)
?? rdtypes
?? renderer.py(11.64 KB)
?? resolver.py(50.88 KB)
?? reversename.py(3.23 KB)
?? rrset.py(5.85 KB)
?? set.py(7.53 KB)
?? tokenizer.py(17.88 KB)
?? tsig.py(7.54 KB)
?? tsigkeyring.py(1.7 KB)
?? ttl.py(2.23 KB)
?? update.py(9.78 KB)
?? version.py(1.23 KB)
?? wiredata.py(3.64 KB)
?? zone.py(39.09 KB)

Editing: tokenizer.py

# Copyright (C) 2003-2007, 2009-2011 Nominum, Inc.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose with or without fee is hereby granted,
# provided that the above copyright notice and this permission notice
# appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

"""Tokenize DNS master file format"""

from io import StringIO
import sys

import dns.exception
import dns.name
import dns.ttl
from ._compat import long, text_type, binary_type

_DELIMITERS = {
    ' ': True,
    '\t': True,
    '\n': True,
    ';': True,
    '(': True,
    ')': True,
    '"': True}

_QUOTING_DELIMITERS = {'"': True}

EOF = 0
EOL = 1
WHITESPACE = 2
IDENTIFIER = 3
QUOTED_STRING = 4
COMMENT = 5
DELIMITER = 6

class UngetBufferFull(dns.exception.DNSException):

"""An attempt was made to unget a token when the unget buffer was full."""

class Token(object):

"""A DNS master file format token.

@ivar ttype: The token type
    @type ttype: int
    @ivar value: The token value
    @type value: string
    @ivar has_escape: Does the token value contain escapes?
    @type has_escape: bool
    """

def __init__(self, ttype, value='', has_escape=False):
        """Initialize a token instance.

@param ttype: The token type
        @type ttype: int
        @param value: The token value
        @type value: string
        @param has_escape: Does the token value contain escapes?
        @type has_escape: bool
        """
        self.ttype = ttype
        self.value = value
        self.has_escape = has_escape

def is_eof(self):
        return self.ttype == EOF

def is_eol(self):
        return self.ttype == EOL

def is_whitespace(self):
        return self.ttype == WHITESPACE

def is_identifier(self):
        return self.ttype == IDENTIFIER

def is_quoted_string(self):
        return self.ttype == QUOTED_STRING

def is_comment(self):
        return self.ttype == COMMENT

def is_delimiter(self):
        return self.ttype == DELIMITER

def is_eol_or_eof(self):
        return self.ttype == EOL or self.ttype == EOF

def __eq__(self, other):
        if not isinstance(other, Token):
            return False
        return (self.ttype == other.ttype and
                self.value == other.value)

def __ne__(self, other):
        if not isinstance(other, Token):
            return True
        return (self.ttype != other.ttype or
                self.value != other.value)

def __str__(self):
        return '%d "%s"' % (self.ttype, self.value)

def unescape(self):
        if not self.has_escape:
            return self
        unescaped = ''
        l = len(self.value)
        i = 0
        while i < l:
            c = self.value[i]
            i += 1
            if c == '\\':
                if i >= l:
                    raise dns.exception.UnexpectedEnd
                c = self.value[i]
                i += 1
                if c.isdigit():
                    if i >= l:
                        raise dns.exception.UnexpectedEnd
                    c2 = self.value[i]
                    i += 1
                    if i >= l:
                        raise dns.exception.UnexpectedEnd
                    c3 = self.value[i]
                    i += 1
                    if not (c2.isdigit() and c3.isdigit()):
                        raise dns.exception.SyntaxError
                    c = chr(int(c) * 100 + int(c2) * 10 + int(c3))
            unescaped += c
        return Token(self.ttype, unescaped)

# compatibility for old-style tuple tokens

def __len__(self):
        return 2

def __iter__(self):
        return iter((self.ttype, self.value))

def __getitem__(self, i):
        if i == 0:
            return self.ttype
        elif i == 1:
            return self.value
        else:
            raise IndexError

class Tokenizer(object):

"""A DNS master file format tokenizer.

A token is a (type, value) tuple, where I{type} is an int, and
    I{value} is a string.  The valid types are EOF, EOL, WHITESPACE,
    IDENTIFIER, QUOTED_STRING, COMMENT, and DELIMITER.

@ivar file: The file to tokenize
    @type file: file
    @ivar ungotten_char: The most recently ungotten character, or None.
    @type ungotten_char: string
    @ivar ungotten_token: The most recently ungotten token, or None.
    @type ungotten_token: (int, string) token tuple
    @ivar multiline: The current multiline level.  This value is increased
    by one every time a '(' delimiter is read, and decreased by one every time
    a ')' delimiter is read.
    @type multiline: int
    @ivar quoting: This variable is true if the tokenizer is currently
    reading a quoted string.
    @type quoting: bool
    @ivar eof: This variable is true if the tokenizer has encountered EOF.
    @type eof: bool
    @ivar delimiters: The current delimiter dictionary.
    @type delimiters: dict
    @ivar line_number: The current line number
    @type line_number: int
    @ivar filename: A filename that will be returned by the L{where} method.
    @type filename: string
    """

def __init__(self, f=sys.stdin, filename=None):
        """Initialize a tokenizer instance.

@param f: The file to tokenize.  The default is sys.stdin.
        This parameter may also be a string, in which case the tokenizer
        will take its input from the contents of the string.
        @type f: file or string
        @param filename: the name of the filename that the L{where} method
        will return.
        @type filename: string
        """

if isinstance(f, text_type):
            f = StringIO(f)
            if filename is None:
                filename = '<string>'
        elif isinstance(f, binary_type):
            f = StringIO(f.decode())
            if filename is None:
                filename = '<string>'
        else:
            if filename is None:
                if f is sys.stdin:
                    filename = '<stdin>'
                else:
                    filename = '<file>'
        self.file = f
        self.ungotten_char = None
        self.ungotten_token = None
        self.multiline = 0
        self.quoting = False
        self.eof = False
        self.delimiters = _DELIMITERS
        self.line_number = 1
        self.filename = filename

def _get_char(self):
        """Read a character from input.
        @rtype: string
        """

if self.ungotten_char is None:
            if self.eof:
                c = ''
            else:
                c = self.file.read(1)
                if c == '':
                    self.eof = True
                elif c == '\n':
                    self.line_number += 1
        else:
            c = self.ungotten_char
            self.ungotten_char = None
        return c

def where(self):
        """Return the current location in the input.

@rtype: (string, int) tuple.  The first item is the filename of
        the input, the second is the current line number.
        """

return (self.filename, self.line_number)

def _unget_char(self, c):
        """Unget a character.

The unget buffer for characters is only one character large; it is
        an error to try to unget a character when the unget buffer is not
        empty.

@param c: the character to unget
        @type c: string
        @raises UngetBufferFull: there is already an ungotten char
        """

if self.ungotten_char is not None:
            raise UngetBufferFull
        self.ungotten_char = c

def skip_whitespace(self):
        """Consume input until a non-whitespace character is encountered.

The non-whitespace character is then ungotten, and the number of
        whitespace characters consumed is returned.

If the tokenizer is in multiline mode, then newlines are whitespace.

@rtype: int
        """

skipped = 0
        while True:
            c = self._get_char()
            if c != ' ' and c != '\t':
                if (c != '\n') or not self.multiline:
                    self._unget_char(c)
                    return skipped
            skipped += 1

def get(self, want_leading=False, want_comment=False):
        """Get the next token.

@param want_leading: If True, return a WHITESPACE token if the
        first character read is whitespace.  The default is False.
        @type want_leading: bool
        @param want_comment: If True, return a COMMENT token if the
        first token read is a comment.  The default is False.
        @type want_comment: bool
        @rtype: Token object
        @raises dns.exception.UnexpectedEnd: input ended prematurely
        @raises dns.exception.SyntaxError: input was badly formed
        """

if self.ungotten_token is not None:
            token = self.ungotten_token
            self.ungotten_token = None
            if token.is_whitespace():
                if want_leading:
                    return token
            elif token.is_comment():
                if want_comment:
                    return token
            else:
                return token
        skipped = self.skip_whitespace()
        if want_leading and skipped > 0:
            return Token(WHITESPACE, ' ')
        token = ''
        ttype = IDENTIFIER
        has_escape = False
        while True:
            c = self._get_char()
            if c == '' or c in self.delimiters:
                if c == '' and self.quoting:
                    raise dns.exception.UnexpectedEnd
                if token == '' and ttype != QUOTED_STRING:
                    if c == '(':
                        self.multiline += 1
                        self.skip_whitespace()
                        continue
                    elif c == ')':
                        if self.multiline <= 0:
                            raise dns.exception.SyntaxError
                        self.multiline -= 1
                        self.skip_whitespace()
                        continue
                    elif c == '"':
                        if not self.quoting:
                            self.quoting = True
                            self.delimiters = _QUOTING_DELIMITERS
                            ttype = QUOTED_STRING
                            continue
                        else:
                            self.quoting = False
                            self.delimiters = _DELIMITERS
                            self.skip_whitespace()
                            continue
                    elif c == '\n':
                        return Token(EOL, '\n')
                    elif c == ';':
                        while 1:
                            c = self._get_char()
                            if c == '\n' or c == '':
                                break
                            token += c
                        if want_comment:
                            self._unget_char(c)
                            return Token(COMMENT, token)
                        elif c == '':
                            if self.multiline:
                                raise dns.exception.SyntaxError(
                                    'unbalanced parentheses')
                            return Token(EOF)
                        elif self.multiline:
                            self.skip_whitespace()
                            token = ''
                            continue
                        else:
                            return Token(EOL, '\n')
                    else:
                        # This code exists in case we ever want a
                        # delimiter to be returned.  It never produces
                        # a token currently.
                        token = c
                        ttype = DELIMITER
                else:
                    self._unget_char(c)
                break
            elif self.quoting:
                if c == '\\':
                    c = self._get_char()
                    if c == '':
                        raise dns.exception.UnexpectedEnd
                    if c.isdigit():
                        c2 = self._get_char()
                        if c2 == '':
                            raise dns.exception.UnexpectedEnd
                        c3 = self._get_char()
                        if c == '':
                            raise dns.exception.UnexpectedEnd
                        if not (c2.isdigit() and c3.isdigit()):
                            raise dns.exception.SyntaxError
                        c = chr(int(c) * 100 + int(c2) * 10 + int(c3))
                elif c == '\n':
                    raise dns.exception.SyntaxError('newline in quoted string')
            elif c == '\\':
                #
                # It's an escape.  Put it and the next character into
                # the token; it will be checked later for goodness.
                #
                token += c
                has_escape = True
                c = self._get_char()
                if c == '' or c == '\n':
                    raise dns.exception.UnexpectedEnd
            token += c
        if token == '' and ttype != QUOTED_STRING:
            if self.multiline:
                raise dns.exception.SyntaxError('unbalanced parentheses')
            ttype = EOF
        return Token(ttype, token, has_escape)

def unget(self, token):
        """Unget a token.

The unget buffer for tokens is only one token large; it is
        an error to try to unget a token when the unget buffer is not
        empty.

@param token: the token to unget
        @type token: Token object
        @raises UngetBufferFull: there is already an ungotten token
        """

if self.ungotten_token is not None:
            raise UngetBufferFull
        self.ungotten_token = token

def next(self):
        """Return the next item in an iteration.
        @rtype: (int, string)
        """

token = self.get()
        if token.is_eof():
            raise StopIteration
        return token

__next__ = next

def __iter__(self):
        return self

# Helpers

def get_int(self):
        """Read the next token and interpret it as an integer.

@raises dns.exception.SyntaxError:
        @rtype: int
        """

def get_uint8(self):
        """Read the next token and interpret it as an 8-bit unsigned
        integer.

@raises dns.exception.SyntaxError:
        @rtype: int
        """

value = self.get_int()
        if value < 0 or value > 255:
            raise dns.exception.SyntaxError(
                '%d is not an unsigned 8-bit integer' % value)
        return value

def get_uint16(self):
        """Read the next token and interpret it as a 16-bit unsigned
        integer.

@raises dns.exception.SyntaxError:
        @rtype: int
        """

value = self.get_int()
        if value < 0 or value > 65535:
            raise dns.exception.SyntaxError(
                '%d is not an unsigned 16-bit integer' % value)
        return value

def get_uint32(self):
        """Read the next token and interpret it as a 32-bit unsigned
        integer.

@raises dns.exception.SyntaxError:
        @rtype: int
        """

token = self.get().unescape()
        if not token.is_identifier():
            raise dns.exception.SyntaxError('expecting an identifier')
        if not token.value.isdigit():
            raise dns.exception.SyntaxError('expecting an integer')
        value = long(token.value)
        if value < 0 or value > long(4294967296):
            raise dns.exception.SyntaxError(
                '%d is not an unsigned 32-bit integer' % value)
        return value

def get_string(self, origin=None):
        """Read the next token and interpret it as a string.

@raises dns.exception.SyntaxError:
        @rtype: string
        """

token = self.get().unescape()
        if not (token.is_identifier() or token.is_quoted_string()):
            raise dns.exception.SyntaxError('expecting a string')
        return token.value

def get_identifier(self, origin=None):
        """Read the next token and raise an exception if it is not an identifier.

@raises dns.exception.SyntaxError:
        @rtype: string
        """

token = self.get().unescape()
        if not token.is_identifier():
            raise dns.exception.SyntaxError('expecting an identifier')
        return token.value

def get_name(self, origin=None):
        """Read the next token and interpret it as a DNS name.

@raises dns.exception.SyntaxError:
        @rtype: dns.name.Name object"""

token = self.get()
        if not token.is_identifier():
            raise dns.exception.SyntaxError('expecting an identifier')
        return dns.name.from_text(token.value, origin)

def get_eol(self):
        """Read the next token and raise an exception if it isn't EOL or
        EOF.

@raises dns.exception.SyntaxError:
        @rtype: string
        """

token = self.get()
        if not token.is_eol_or_eof():
            raise dns.exception.SyntaxError(
                'expected EOL or EOF, got %d "%s"' % (token.ttype,
                                                      token.value))
        return token.value

def get_ttl(self):
        token = self.get().unescape()
        if not token.is_identifier():
            raise dns.exception.SyntaxError('expecting an identifier')
        return dns.ttl.from_text(token.value)

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