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dd� Zdd� Zd d � Zd d � Zd d!� Zd"d#� Zd$S )&�Tokenz�A DNS master file format token.
@ivar ttype: The token type
@type ttype: int
@ivar value: The token value
@type value: string
@ivar has_escape: Does the token value contain escapes?
@type has_escape: bool
� Fc C s || _ || _|| _dS )a Initialize a token instance.
@param ttype: The token type
@type ttype: int
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@type has_escape: bool
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| j tkS )N)r �EOF)r r r r �is_eofM s z Token.is_eofc C s
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Zdd� Zdd� Zdd� Zdd� Zd d � Zd)d d �Zd*d d!�Zd+d"d#�Zd$d%� Zd&d'� ZdS ),� Tokenizera� 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
Nc C s� t |t�r t|�}|dkr`d}n@t |t�rDt|j� �}|dkr`d}n |dkr`|tjkr\d}nd}|| _d| _d| _ d| _
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| _d| _|| _dS )a� 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
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@type f: file or string
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zTokenizer.__init__c C sZ | j dkrJ| jrd}qV| jjd�}|dkr2d| _qV|dkrV| jd7 _n | j }d| _ |S )z<Read a character from input.
@rtype: string
Nr r Tr )rP rT rO �readrW )r rB r r r � _get_char� s
zTokenizer._get_charc C s | j | jfS )z�Return the current location in the input.
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the input, the second is the current line number.
)rX rW )r r r r �where� s zTokenizer.wherec C s | j dk rt�|| _ dS )aE 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
N)rP r )r rB r r r � _unget_char s
zTokenizer._unget_charc C sL d}xB| j � }|dkr<|dkr<|dks.| j r<| j|� |S |d7 }qW dS )a( 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
r r r r r N)r[ rR r] )r �skippedrB r r r �skip_whitespace s
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��t}t|||�S )a 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
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zunbalanced parenthesesr5 r6 r7 znewline in quoted string)rQ r& r, r_ r r% r' r[ rV rS r9 r: r; r) rR r= �_QUOTING_DELIMITERSrU r# r] r+ r! r- r< r> r? )
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z
Tokenizer.getc C s | j dk rt�|| _ dS )a@ Unget a token.
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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
N)rQ r )r ra r r r �unget� s
zTokenizer.ungetc C s | j � }|j� rt�|S )zLReturn the next item in an iteration.
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StopIteration)r ra r r r �next� s zTokenizer.nextc C s | S )Nr )r r r r rH � s zTokenizer.__iter__c C s@ | j � j� }|j� s tjjd��|jj� s6tjjd��t|j�S )z|Read the next token and interpret it as an integer.
@raises dns.exception.SyntaxError:
@rtype: int
zexpecting an identifierzexpecting an integer) rb rE r( r9 r: r= r r< r? )r ra r r r �get_int� s
zTokenizer.get_intc C s, | j � }|dk s|dkr(tjjd| ��|S )z�Read the next token and interpret it as an 8-bit unsigned
integer.
@raises dns.exception.SyntaxError:
@rtype: int
r � z#%d is not an unsigned 8-bit integer)rf r9 r: r= )r r r r r � get_uint8� s
zTokenizer.get_uint8c C s, | j � }|dk s|dkr(tjjd| ��|S )z�Read the next token and interpret it as a 16-bit unsigned
integer.
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@rtype: int
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zTokenizer.get_uint16c C sh | j � j� }|j� s tjjd��|jj� s6tjjd��t|j�}|dk sT|td�krdtjjd| ��|S )z�Read the next token and interpret it as a 32-bit unsigned
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@raises dns.exception.SyntaxError:
@rtype: int
zexpecting an identifierzexpecting an integerr l z$%d is not an unsigned 32-bit integer) rb rE r( r9 r: r= r r< r )r ra r r r r �
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zTokenizer.get_uint32c C s. | j � j� }|j� p|j� s(tjjd��|jS )z}Read the next token and interpret it as a string.
@raises dns.exception.SyntaxError:
@rtype: string
zexpecting a string)rb rE r( r* r9 r: r= r )r �originra r r r �
get_string� s zTokenizer.get_stringc C s& | j � j� }|j� s tjjd��|jS )z�Read the next token and raise an exception if it is not an identifier.
@raises dns.exception.SyntaxError:
@rtype: string
zexpecting an identifier)rb rE r( r9 r: r= r )r rk ra r r r �get_identifier
s zTokenizer.get_identifierc C s, | j � }|j� s tjjd��tjj|j|�S )z�Read the next token and interpret it as a DNS name.
@raises dns.exception.SyntaxError:
@rtype: dns.name.Name objectzexpecting an identifier)rb r( r9 r: r= �name� from_textr )r rk ra r r r �get_name s zTokenizer.get_namec C s. | j � }|j� s(tjjd|j|jf ��|jS )z�Read the next token and raise an exception if it isn't EOL or
EOF.
@raises dns.exception.SyntaxError:
@rtype: string
z expected EOL or EOF, got %d "%s")rb r/ r9 r: r= r r )r ra r r r �get_eol! s zTokenizer.get_eolc C s. | j � j� }|j� s tjjd��tjj|j�S )Nzexpecting an identifier) rb rE r( r9 r: r= Zttlro r )r ra r r r �get_ttl0 s zTokenizer.get_ttl)FF)N)N)N)r r r r rM rN r r[ r\ r] r_ rb rc re �__next__rH rf rh ri rj rl rm rp rq rr r r r r rK � s( $
{
rK )r �ior rM Z
dns.exceptionr9 Zdns.nameZdns.ttlZ_compatr r r rU r` r! r# r% r' r) r+ r- r: Z DNSExceptionr �objectr rK r r r r �<module> s0 o