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jinja2.lexer
~~~~~~~~~~~~
This module implements a Jinja / Python combination lexer. The
`Lexer` class provided by this module is used to do some preprocessing
for Jinja.
On the one hand it filters out invalid operators like the bitshift
operators we don't allow in templates. On the other hand it separates
template code and python code in expressions.
:copyright: (c) 2010 by the Jinja Team.
:license: BSD, see LICENSE for more details.
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| | �S ) Nzbegin of commentzend of commentr% zbegin of statement blockzend of statement blockzbegin of print statementzend of print statementzbegin of line statementzend of line statementztemplate data / textzend of template)�reverse_operators�TOKEN_COMMENT_BEGIN�TOKEN_COMMENT_END�
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rv c @ s$ e Zd ZdZefdd�Zdd� ZdS )�FailurezjClass that raises a `TemplateSyntaxError` if called.
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c C s || _ || _d S )N)�message� error_class)�selfrx �clsr@ r@ rD �__init__� s zFailure.__init__c C s | � | j||��d S )N)ry rx )rz �lineno�filenamer@ r@ rD �__call__� s zFailure.__call__N)�__name__�
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Token.__str__c C s2 | j |krdS d|kr.|�dd�| j | jgkS dS )z�Test a token against a token expression. This can either be a
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against string values and types.
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Token.testc G s x|D ]}| � |�rdS qW dS )z(Test against multiple token expressions.TF)r� )rz �iterablerd r@ r@ rD �test_any� s
zToken.test_anyc C s d| j | j| jf S )NzToken(%r, %r, %r))r} r^ r_ )rz r@ r@ rD �__repr__ s zToken.__repr__N)r� r� r� r� � __slots__�ranger} r^ r_ r� r� r� r� r� r@ r@ r@ rD r� � s
r� c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS ) �TokenStreamIteratorz`The iterator for tokenstreams. Iterate over the stream
until the eof token is reached.
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|| _ d S )N)�stream)rz r� r@ r@ rD r| s z TokenStreamIterator.__init__c C s | S )Nr@ )rz r@ r@ rD �__iter__ s z TokenStreamIterator.__iter__c C s0 | j j}|jtkr"| j �� t� �t| j � |S )N)r� �currentr^ rZ �close�
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dd� Zdd� Zdd� Zdd � Zd S ) � TokenStreamz�A token stream is an iterable that yields :class:`Token`\s. The
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one token ahead. The current active token is stored as :attr:`current`.
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W dS )zGot n tokens ahead.N)r� r )rz �nrH r@ r@ rD �skipF s zTokenStream.skipc C s | j �|�rt| �S dS )zqPerform the token test and return the token if it matched.
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N)r� r� r )rz rd r@ r@ rD �next_ifK s zTokenStream.next_ifc C s | � |�dk S )z8Like :meth:`next_if` but only returns `True` or `False`.N)r� )rz rd r@ r@ rD �skip_ifR s zTokenStream.skip_ifc C sX | j }| jr| j�� | _ n:| j jtk rTyt| j�| _ W n tk
rR | �� Y nX |S )z)Go one token ahead and return the old one) r� r� �popleftr^ rZ r r� r� r� )rz �rvr@ r@ rD r� V s zTokenStream.__next__c C s" t | jjtd�| _d| _d| _dS )zClose the stream.r� NT)r� r� r} rZ r� r� )rz r@ r@ rD r� b s zTokenStream.closec C st | j �|�s^t|�}| j jtkr:td| | j j| j| j��td|t | j �f | j j| j| j��z| j S t
| � X dS )z}Expect a given token type and return it. This accepts the same
argument as :meth:`jinja2.lexer.Token.test`.
z(unexpected end of template, expected %r.zexpected token %r, got %rN) r� r� re r^ rZ r r} r r~ ra r )rz rd r@ r@ rD �expecth s zTokenStream.expectN)rb )r� r� r� r� r| r� r� Z __nonzero__r� Zeosr� r� r� r� r� r� r� r� r@ r@ r@ rD r� ! s
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Class that implements a lexer for a given environment. Automatically
created by the environment class, usually you don't have to do that.
Note that the lexer is not automatically bound to an environment.
Multiple environments can share the same lexer.
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||j�||j�|f �tt&fdf|d�t d �fd fgt'|d �t(dfg| t)|d!�t*t+fdfgi| _,d S )"Nc S s t �| t jt jB �S )N)rF �compile�M�S)rH r@ r@ rD rK � rL z Lexer.__init__.<locals>.<lambda>z\n?r� r, z^%s(.*)z|%srb z(?!%s)z^[ \t]*z%s%s(?!%s)|%s\+?z %s%s%s|%s\+?ri r% z%s�rootz (.*?)(?:%s)r= z4(?P<raw_begin>(?:\s*%s\-|%s)\s*raw\s*(?:\-%s\s*|%s))c s& g | ] \}}d ||� � ||�f �qS )z(?P<%s_begin>\s*%s\-|%s))r[ )rA r� �r)� prefix_rer@ rD rE � s z"Lexer.__init__.<locals>.<listcomp>z#bygroupz.+z(.*?)((?:\-%s\s*|%s)%s)z#popz(.)zMissing end of comment tagz(?:\-%s\s*|%s)%sz
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zLexer.__init__c C s t �| j|�S )z@Called for strings and template data to normalize it to unicode.)rf r r� )rz r_ r@ r@ rD �_normalize_newlines s zLexer._normalize_newlinesNc C s& | � ||||�}t| �|||�||�S )zCCalls tokeniter + tokenize and wraps it in a token stream.
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TOKEN_LTEQZ TOKEN_MODZ TOKEN_MULZTOKEN_NEZ
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