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jinja2.parser
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Implements the template parser.
:copyright: (c) 2017 by the Jinja Team.
:license: BSD, see LICENSE for more details.
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dd� Zdd� Zdd� Zd d � Zd d � Zd d!� Zd"d#� Zd$d%� Zd&d'� Zd(d)� Zd*d+� Zd,d-� Zd.d/� Zd0d1� Zd2d3� Z d4d5� Z dod7d8�Z dpd9d:�Z d;d<� Z d=d>� Z!d?d@� Z"dAdB� Z#dCdD� Z$dEdF� Z%dGdH� Z&dIdJ� Z'dKdL� Z(dqdMdN�Z)dOdP� Z*drdQdR�Z+dSdT� Z,dUdV� Z-dWdX� Z.dYdZ� Z/d[d\� Z0d]d^� Z1d_d`� Z2dsdadb�Z3dcdd� Z4dtdedf�Z5dgdh� Z6dS )u�Parserz�This is the central parsing class Jinja2 uses. It's passed to
extensions and can be used to parse expressions or statements.
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� environment� _tokenize�stream�name�filename�closed�
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_tag_stack�_end_token_stack)�selfr �sourcer r! �state� extension�tag� r- � /usr/lib/python3.6/parser.py�__init__% s zParser.__init__c C s( |dkr| j jj}|||| j| j��dS )z�Convenience method that raises `exc` with the message, passed
line number or last line number as well as the current name and
filename.
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z Parser.failc C s� g }x |D ]}|j tt|�� q
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Nz or c s s | ]}d t |� V qdS )z'%s'N)r )�.0�exprr- r- r. � <genexpr>C s z&Parser._fail_ut_eof.<locals>.<genexpr>� zUnexpected end of template.z Encountered unknown tag '%s'.z_You probably made a nesting mistake. Jinja is expecting this tag, but currently looking for %s.z-Jinja was looking for the following tags: %s.z4The innermost block that needs to be closed is '%s'.� ���r: )�extendr r �join�appendr& r4 )r( r Zend_token_stackr1 ZexpectedZexprsZcurrently_looking�messager- r- r. � _fail_ut_eof= s*
zParser._fail_ut_eofc C s | j || j|�S )z�Called if the parser encounters an unknown tag. Tries to fail
with a human readable error message that could help to identify
the problem.
)r? r' )r( r r1 r- r- r. �fail_unknown_tag\ s zParser.fail_unknown_tagc C s* t | j�}|dk r |j|� | jd||�S )z9Like fail_unknown_tag but for end of template situations.N)�listr' r= r? )r( �
end_tokensr1 �stackr- r- r. �fail_eofc s
zParser.fail_eofc C s, | j jjdkrdS |dk r(| j jj|�S dS )z Are we at the end of a tuple?� variable_end� block_end�rparenTNF)rE rF rG )r r0 �type�test_any)r( �extra_end_rulesr- r- r. � is_tuple_endj s
zParser.is_tuple_endc C s6 | j d7 _ tjtj�}tjj|d| j |d� |S )zDReturn a new free identifier as :class:`~jinja2.nodes.InternalName`.r8 zfi%d)r1 )r% �object�__new__r Z InternalNameZNoder/ )r( r1 �rvr- r- r. �free_identifierr s zParser.free_identifierc
C s� | j j}|jdkr | jd|j� | jj|j� d}z�|jtkrTt | d| j jj �� S |jdkrf| j
� S |jdkrx| j � S | j j
|j�}|dk r�|| �S | jj� d}| j|j|j� W d|r�| jj� X dS ) zParse a single statement.r ztag name expectedTZparse_�call�filterNF)r r0 rH r4 r1 r& r= �value�_statement_keywords�getattr�parse_call_block�parse_filter_blockr# �get�popr@ )r( �tokenZpop_tagZextr- r- r. �parse_statementy s(
zParser.parse_statementFc C sL | j jd� | j jd� | j|�}| j jjdkr:| j|� |rHt| j � |S )aR Parse multiple statements into a list until one of the end tokens
is reached. This is used to parse the body of statements as it also
parses template data if appropriate. The parser checks first if the
current token is a colon and skips it if there is one. Then it checks
for the block end and parses until if one of the `end_tokens` is
reached. Per default the active token in the stream at the end of
the call is the matched end token. If this is not wanted `drop_needle`
can be set to `True` and the end token is removed.
�colonrF �eof)r �skip_if�expect�subparser0 rH rD �next)r( rB � drop_needle�resultr- r- r. �parse_statements� s
zParser.parse_statementsc C sf t | j�j}| jdd�}| jjd�r<| j� }tj|||d�S | jd�}| j ddd�}tj
||||d�S ) zParse an assign statement.T)�with_namespace�assign)r1 N� name:endset)ra )rf ) r` r r1 �parse_assign_targetr] � parse_tupler ZAssign� parse_filterrc Z AssignBlock)r( r1 �targetr6 Z filter_node�bodyr- r- r. � parse_set� s
zParser.parse_setc C s� | j jd�j}| jdd�}| j jd� | jddd�}d}| j jd�rL| j� }| j jd�}| jd�}t| j �j d krxg }n| jdd d
�}t
j |||||||d�S )zParse a for loop.zname:for�name:in)rJ F�name:recursive)�
with_condexprrJ Nzname:if� name:endfor� name:elseZendforT)ra )r1 )rm )rn )rp rq )rp ) r r^ r1 rg rh r] �parse_expressionrc r` rR r ZFor)r( r1 rj �iter�test� recursiverk �else_r- r- r. � parse_for� s
zParser.parse_forc C s� t j| jjd�jd� }}x|| jdd�|_| jd
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t | j�}|jd�rxt j| jj jd�}|j j
|� q n|jd�r�| jd dd �|_
P q W |S ) zParse an if construct.zname:if)r1 F)ro � name:elif� name:else�
name:endifT)ra )rx ry rz )rz )r ZIfr r^ r1 rh rt rc rk Zelif_rv r` r0 r= )r( �noderb rY r- r- r. �parse_if� s"
zParser.parse_ifc C s� t jt| j�jd�}g }g }xb| jjjdkr~| jjj}|rF| jjd� | j� }|j d� |j
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N)r1 rF �comma�paramre � name:endwithT)ra )r )r ZWithr` r r1 r0 rH r^ rg �set_ctxr= rr �targets�valuesrc rk )r( r{ r� r� r1 rj r- r- r. �
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zParser.parse_withc C sD t jt| j�jd�}t jd| j� �g|_| jddd�|_ t j
|g�S )N)r1 r �name:endautoescapeT)ra )r� ) r ZScopedEvalContextModifierr` r r1 �Keywordrr Zoptionsrc rk ZScope)r( r{ r- r- r. �parse_autoescape� s
zParser.parse_autoescapec C sp t jt| j�jd�}| jjd�j|_| jjd�|_ | jj
j dkrJ| j d� | j
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dd�|_| jjd |j � |S ) N)r1 r z name:scopedr zpBlock names in Jinja have to be valid Python identifiers and may not contain hyphens, use an underscore instead.�
name:endblockT)ra zname:)r� )r ZBlockr` r r1 r^ rR r r] Zscopedr0 rH r4 rc rk )r( r{ r- r- r. � parse_block� s
zParser.parse_blockc C s" t jt| j�jd�}| j� |_|S )N)r1 )r ZExtendsr` r r1 rr �template)r( r{ r- r- r. �
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zParser.parse_extendsc C sH | j jjdd�r>| j j� jd�r>t| j �jdk|_| j j� n||_|S )Nz name:withz name:withoutz name:contextr ) r r0 rI �lookrt r` rR � with_context�skip)r( r{ �defaultr- r- r. �parse_import_context s zParser.parse_import_contextc C sb t jt| j�jd�}| j� |_| jjjd�rP| jj � jd�rPd|_
| jj d� nd|_
| j |d�S )N)r1 z name:ignorez name:missingT� F)
r ZIncluder` r r1 rr r� r0 rt r� Zignore_missingr� r� )r( r{ r- r- r. �
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zParser.parse_includec C sF t jt| j�jd�}| j� |_| jjd� | jdd�j |_
| j |d�S )N)r1 zname:asT)� name_onlyF) r ZImportr` r r1 rr r� r^ rg r rj r� )r( r{ r- r- r. � parse_import) s
zParser.parse_importc s t jt�j�jd�� �j� � _�jjd� g � _� �fdd�}x�� jrR�jjd� �jj j
dkr�|� rhP �j dd�}|j j
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dkr�P q@�jjd� q@W t� d
��sd� _� S )N)r1 z name:importc sB �j jjdkr>�j j� jd�r>t�j �jdk� _�j j� dS dS )Nr �withoutz name:contextTF)r r� )r r0 rR r� rt r` r� r� r- )r{ r( r- r. �
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z(Parser.parse_from.<locals>.parse_contextr} r T)r� �_z4names starting with an underline can not be imported)r3 zname:asr� F)r Z
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zParser.parse_fromc C s� g |_ }g |_}| jjd� xl| jjjdkr�|r@| jjd� | jdd�}|jd� | jjd�rr|j | j
� � n|r�| j d� |j |� q"W | jjd� d S ) N�lparenrG r} T)r� r~ re z-non-default argument follows default argument) �args�defaultsr r^ r0 rH rg r� r] r= rr r4 )r( r{ r� r� �argr- r- r. �parse_signatureV s
zParser.parse_signaturec C st t jt| j�jd�}| jjjdkr.| j|� n g |_g |_ | j
� |_ t |j t j
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expected call� name:endcallT)ra )r� )r Z CallBlockr` r r1 r0 rH r� r� r� rr rP �
isinstance�Callr4 rc rk )r( r{ r- r- r. rU f s
zParser.parse_call_blockc C s8 t jt| j�jd�}| jd dd�|_| jddd�|_|S )N)r1 T)� start_inline�name:endfilter)ra )r� ) r Z FilterBlockr` r r1 ri rQ rc rk )r( r{ r- r- r. rV t s
zParser.parse_filter_blockc C sB t jt| j�jd�}| jdd�j|_| j|� | jddd�|_ |S )N)r1 T)r� �
name:endmacro)ra )r� )
r ZMacror` r r1 rg r r� rc rk )r( r{ r- r- r. � parse_macro{ s
zParser.parse_macroc C sT t jt| j�jd�}g |_ x4| jjjdkrN|j r<| jjd� |j j| j � � q W |S )N)r1 rF r} )
r �Outputr` r r1 r0 rH r^ r= rr )r( r{ r- r- r. � parse_print� s zParser.parse_printTc C s� |rN| j j� jdkrN| j jd�}t| j � | j jd�}tj|j|j|jd�}nL|rt| j jd�}tj |jd|jd�}n&|r�| j
d|d�}n| j � }|j d� |j
� s�| jd|jjj� |j� |S )a Parse an assignment target. As Jinja2 allows assignments to
tuples, this function can parse all allowed assignment targets. Per
default assignments to tuples are parsed, that can be disable however
by setting `with_tuple` to `False`. If only assignments to names are
wanted `name_only` can be set to `True`. The `extra_end_rules`
parameter is forwarded to the tuple parsing function. If
`with_namespace` is enabled, a namespace assignment may be parsed.
�dotr )r1 ZstoreT)�
simplifiedrJ zcan't assign to %r)r r� rH r^ r` r ZNSRefrR r1 �Namerh �
parse_primaryr� Z
can_assignr4 � __class__�__name__�lower)r( Z
with_tupler� rJ rd rY �attrrj r- r- r. rg � s"
zParser.parse_assign_targetc C s |r | j � S | j� S )z�Parse an expression. Per default all expressions are parsed, if
the optional `with_condexpr` parameter is set to `False` conditional
expressions are not parsed.
)�parse_condexpr�parse_or)r( ro r- r- r. rr � s zParser.parse_expressionc C sf | j jj}| j� }xN| j jd�r`| j� }| j jd�r>| j� }nd }tj||||d�}| j jj}qW |S )Nzname:ifz name:else)r1 )r r0 r1 r� r] r� r ZCondExpr)r( r1 Zexpr1Zexpr2Zexpr3r- r- r. r� � s
zParser.parse_condexprc C sJ | j jj}| j� }x2| j jd�rD| j� }tj|||d�}| j jj}qW |S )Nzname:or)r1 )r r0 r1 � parse_andr] r ZOr)r( r1 �left�rightr- r- r. r� � s
zParser.parse_orc C sJ | j jj}| j� }x2| j jd�rD| j� }tj|||d�}| j jj}qW |S )Nzname:and)r1 )r r0 r1 � parse_notr] r ZAnd)r( r1 r� r� r- r- r. r� � s
zParser.parse_andc C s4 | j jjd�r,t| j �j}tj| j� |d�S | j� S )Nzname:not)r1 ) r r0 rt r` r1 r �Notr� �
parse_compare)r( r1 r- r- r. r� � s zParser.parse_notc C s� | j jj}| j� }g }x�| j jj}|tkrLt| j � |jtj || j� �� nh| j j
d�rp|jtj d| j� �� nD| j jj d�r�| j j � j d�r�| j j
d� |jtj d| j� �� nP | j jj}qW |s�|S tj|||d�S )Nzname:in�inzname:notr� Znotin)r1 )r r0 r1 � parse_math1rH �_compare_operatorsr` r= r ZOperandr] rt r� r� ZCompare)r( r1 r6 Zops�
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zParser.parse_comparec C sb | j jj}| j� }xJ| j jjdkr\t| j jj }t| j � | j� }||||d�}| j jj}qW |S )Nr r )r1 )r r )r r0 r1 � parse_concatrH � _math_nodesr` )r( r1 r� �clsr� r- r- r. r� � s
zParser.parse_math1c C sb | j jj}| j� g}x*| j jjdkr>t| j � |j| j� � qW t|�dkrT|d S tj ||d�S )N�tilder8 r )r1 )
r r0 r1 � parse_math2rH r` r= �lenr ZConcat)r( r1 r� r- r- r. r� � s
zParser.parse_concatc C sb | j jj}| j� }xJ| j jjdkr\t| j jj }t| j � | j� }||||d�}| j jj}qW |S )Nr r r r )r1 )r r r r )r r0 r1 � parse_powrH r� r` )r( r1 r� r� r� r- r- r. r� s
zParser.parse_math2c C sV | j jj}| j� }x>| j jjdkrPt| j � | j� }tj|||d�}| j jj}qW |S )N�pow)r1 )r r0 r1 � parse_unaryrH r` r ZPow)r( r1 r� r� r- r- r. r� s
zParser.parse_powc C s� | j jj}| j jj}|dkr<t| j � tj| jd�|d�}n0|dkrdt| j � tj| jd�|d�}n| j � }| j
|�}|r�| j |�}|S )Nr F)r1 r ) r r0 rH r1 r` r ZNegr� ZPosr� �
parse_postfix�parse_filter_expr)r( Z with_filterr� r1 r{ r- r- r. r� s
zParser.parse_unaryc C sx | j j}|jdkrr|jdkr4tj|jdk|jd�}n0|jdkrPtjd |jd�}ntj|jd |jd�}t| j � �n|jd
kr�t| j � |jg}|j}x,| j jjd
kr�|j | j jj� t| j � q�W tjd j
|�|d�}n�|jdk�rt| j � tj|j|jd�}nr|jdk�r2t| j � | j dd�}| j j d� nB|jdk�rH| j
� }n,|jdk�r^| j� }n| jdt|� |j� |S )Nr �true�false�True�False)r1 �none�None�load�string� �integer�floatr� T)�explicit_parenthesesrG �lbracket�lbracezunexpected '%s')r� r� r� r� )r� r� )r� r� )r� r� )r r0 rH rR r �Constr1 r� r` r= r< rh r^ �
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� j j� � t j |d|d �S )
a� Works like `parse_expression` but if multiple expressions are
delimited by a comma a :class:`~jinja2.nodes.Tuple` node is created.
This method could also return a regular expression instead of a tuple
if no commas where found.
The default parsing mode is a full tuple. If `simplified` is `True`
only names and literals are parsed. The `no_condexpr` parameter is
forwarded to :meth:`parse_expression`.
Because tuples do not require delimiters and may end in a bogus comma
an extra hint is needed that marks the end of a tuple. For example
for loops support tuples between `for` and `in`. In that case the
`extra_end_rules` is set to ``['name:in']``.
`explicit_parentheses` is true if the parsing was triggered by an
expression in parentheses. This is used to figure out if an empty
tuple is a valid expression or not.
c s � j dd�S )NF)ro )rr r- )r( r- r. �<lambda>d s z$Parser.parse_tuple.<locals>.<lambda>Fr} Tr z Expected an expression, got '%s'r� )r1 )
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zParser.parse_tuplec C sn | j jd�}g }x@| j jjdkrP|r0| j jd� | j jjdkr@P |j| j� � qW | j jd� tj||jd�S )Nr� �rbracketr} )r1 ) r r^ r0 rH r= rr r ZListr1 )r( rY �itemsr- r- r. r� � s zParser.parse_listc C s� | j jd�}g }xf| j jjdkrv|r0| j jd� | j jjdkr@P | j� }| j jd� | j� }|jtj|||jd�� qW | j jd� tj ||jd�S )Nr� Zrbracer} r[ )r1 )
r r^ r0 rH rr r= r ZPairr1 ZDict)r( rY r� �keyrR r- r- r. r� � s zParser.parse_dictc C sF x@| j jj}|dks |dkr(| j|�}q|dkr<| j|�}qP qW |S )Nr� r� r� )r r0 rH �parse_subscript�
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zParser.parse_postfixc C s` xZ| j jj}|dkr | j|�}q|dkrB| j jjdkrB| j|�}q|dkrV| j|�}qP qW |S )N�piper �isr� )r r0 rH ri rR �
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||d|jd�S |jdk�rg }x0| jjjdkr�|r�| jj d � |j | j
� � q�W | jj d� t|�d
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zParser.parse_subscriptc C s� | j jj}| j jjdkr*t| j � d g}n*| j� }| j jjdkrD|S t| j � |g}| j jjdkrn|jd � n(| j jjdkr�|j| j� � n
|jd � | j jjdkr�t| j � | j jjdkr�|j| j� � q�|jd � n
|jd � tj|d|i�S )Nr[ r� r} r1 )r� r} )r� r} ) r r0 r1 rH r` rr r= r ZSlice)r( r1 r� r{ r- r- r. r� � s*
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j || | j d �� n|| � |j � j� � d
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|||||�j d �S )Nr� Fc s | s� j d�j� d S )Nz+invalid syntax for function call expression)r4 r1 )r6 )r( rY r- r. �ensure� s z!Parser.parse_call.<locals>.ensurerG r} r r� r re r� )r1 T)r r^ r0 rH r` rr r� rR r� r= r r� r1 r� )
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zParser.parse_filterc C s t | j�}| jjjd�r(t | j� d}nd}| jjd�j}x2| jjjdkrlt | j� |d| jjd�j 7 }q<W d }}g }| jjjdkr�| jd �\}}}}nJ| jjjdkr�| jjjd
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