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d$ d% d& d' d( g Z1 d) e f d* YZ2 d+ e2 f d, YZ3 d- e3 f d. YZ4 d S(/ s4 Support for "safe" evaluation of Python expressions.iN( t astt parse( t ExpressionCodeGeneratort ModuleCodeGenerator( t ImmutableSet( t Set( t dedent( t Markup( t TemplateRuntimeError( t flattent Codet
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LenientLookupt StrictLookupt Undefinedt UndefinedErrors restructuredtext ent _FakeMappingc B s e Z d Z Z RS( c G s d S( N( t None( t a( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt ' s ( t __name__t
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| i } n9 g } | i D]! } | i d p | | qC qC ~ } | i g } | D] } | | t | | f q~ ~ d S( sh This function is used as helper if a Python version with a broken
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:param source: either a string containing the source code, or an AST
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:param filename: the (preferably absolute) name of the file containing
the code
:param lineno: the number of the line on which the code was found
:param lookup: the lookup class that defines how variables are looked
up in the context; can be either "strict" (the default),
"lenient", or a custom lookup class
:param xform: the AST transformer that should be applied to the code;
if `None`, the appropriate transformation is chosen
depending on the mode
t modes' Expected string or AST node, but got %rt ?t evalt filenamet linenot xformt lenientR- N( t
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; s $ c B s# e Z d Z g Z d Z d Z RS( s Evaluates Python expressions used in templates.
>>> data = dict(test='Foo', items=[1, 2, 3], dict={'some': 'thing'})
>>> Expression('test').evaluate(data)
'Foo'
>>> Expression('items[0]').evaluate(data)
1
>>> Expression('items[-1]').evaluate(data)
3
>>> Expression('dict["some"]').evaluate(data)
'thing'
Similar to e.g. Javascript, expressions in templates can use the dot
notation for attribute access to access items in mappings:
>>> Expression('dict.some').evaluate(data)
'thing'
This also works the other way around: item access can be used to access
any object attribute:
>>> class MyClass(object):
... myattr = 'Bar'
>>> data = dict(mine=MyClass(), key='myattr')
>>> Expression('mine.myattr').evaluate(data)
'Bar'
>>> Expression('mine["myattr"]').evaluate(data)
'Bar'
>>> Expression('mine[key]').evaluate(data)
'Bar'
All of the standard Python operators are available to template expressions.
Built-in functions such as ``len()`` are also available in template
expressions:
>>> data = dict(items=[1, 2, 3])
>>> Expression('len(items)').evaluate(data)
3
R0 c C s/ d } | i | } t | i | h | d 6 S( s Evaluate the expression against the given data dictionary.
:param data: a mapping containing the data to evaluate against
:return: the result of the evaluation
t before_and_thist __data__( R, R0 R+ ( R= t datat __traceback_hide__R, ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt evaluate s ( R R RZ R[ R. R` ( ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyR s (c B s# e Z d Z g Z d Z d Z RS( s Executes Python statements used in templates.
>>> data = dict(test='Foo', items=[1, 2, 3], dict={'some': 'thing'})
>>> Suite("foo = dict['some']").execute(data)
>>> data['foo']
'thing'
t execc B s& d } | i | } | i | | Ud S( s Execute the suite in the given data dictionary.
:param data: a mapping containing the data to execute in
R\ N( R, R+ ( R= R^ R_ R, ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt execute s ( R R RZ R[ R. Rb ( ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyR s c B s e Z d Z e d Z RS( s Exception thrown when a template expression attempts to access a variable
not defined in the context.
:see: `LenientLookup`, `StrictLookup`
c C sE | t j o d t | | f } n d | } t i | | d S( Ns %s has no member named "%s"s "%s" not defined( t UNDEFINEDt reprR R@ ( R= R( t ownert message( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyR@ s
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Unlike the Python runtime, template expressions can refer to an undefined
variable without causing a `NameError` to be raised. The result will be an
instance of the `Undefined` class, which is treated the same as ``False`` in
conditions, but raise an exception on any other operation:
>>> foo = Undefined('foo')
>>> bool(foo)
False
>>> list(foo)
[]
>>> print foo
undefined
However, calling an undefined variable, or trying to access an attribute
of that variable, will raise an exception that includes the name used to
reference that undefined variable.
>>> foo('bar')
Traceback (most recent call last):
...
UndefinedError: "foo" not defined
>>> foo.bar
Traceback (most recent call last):
...
UndefinedError: "foo" not defined
:see: `LenientLookup`
t _namet _ownerc C s | | _ | | _ d S( s Initialize the object.
:param name: the name of the reference
:param owner: the owning object, if the variable is accessed as a member
N( Rg Rh ( R= R( Re ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyR@ s c C s
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LookupBasec B sz e Z d Z d Z e e Z d Z e e Z d Z e e Z d Z e e Z e d Z e e Z RS( s8 Abstract base class for variable lookup implementations.c C s7 h | d 6| i d 6| i d 6| i d 6t d 6t d 6S( sn Construct the globals dictionary to use as the execution context for
the expression or suite.
R] t _lookup_namet _lookup_attrt _lookup_itemR) R ( t lookup_namet lookup_attrt lookup_itemR) R ( t clsR^ ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyR< # s
c C s_ t } | i | t } | t j o6 t i | | } | t j o | i | } q[ n | S( N( Ro t getRc t BUILTINSRm ( R} R^ R( R_ t val( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyRz 1 s
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| d | } n | S n Xd S( Ni i Re ( Ro t lenR R t
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t d S( s Can be overridden by subclasses to specify behavior when undefined
variables are accessed.
:param key: the name of the variable
:param owner: the owning object, if the variable is accessed as a member
N( t NotImplementedError( R} R Re ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyRm Y s (
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c B s& e Z d Z e d Z e e Z RS( s Default variable lookup mechanism for expressions.
When an undefined variable is referenced using this lookup style, the
reference evaluates to an instance of the `Undefined` class:
>>> expr = Expression('nothing', lookup='lenient')
>>> undef = expr.evaluate({})
>>> undef
The same will happen when a non-existing attribute or item is accessed on
an existing object:
>>> expr = Expression('something.nil', lookup='lenient')
>>> expr.evaluate({'something': dict()})
See the documentation of the `Undefined` class for details on the behavior
of such objects.
:see: `StrictLookup`
c C s t } t | d | S( s Return an ``Undefined`` object.Re ( Ro R ( R} R Re R_ ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyRm { s ( R R RZ Rc Rm R ( ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyR
d s c B s& e Z d Z e d Z e e Z RS( s Strict variable lookup mechanism for expressions.
Referencing an undefined variable using this lookup style will immediately
raise an ``UndefinedError``:
>>> expr = Expression('nothing', lookup='strict')
>>> expr.evaluate({})
Traceback (most recent call last):
...
UndefinedError: "nothing" not defined
The same happens when a non-existing attribute or item is accessed on an
existing object:
>>> expr = Expression('something.nil', lookup='strict')
>>> expr.evaluate({'something': dict()})
Traceback (most recent call last):
...
UndefinedError: {} has no member named "nil"
c C s t } t | d | d S( s( Raise an ``UndefinedError`` immediately.Re N( Ro R ( R} R Re R_ ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyRm s ( R R RZ Rc Rm R ( ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyR s R0 c C s' | i } | d j o g } | i D] } | | i q* ~ } | o | d } t d i | d i } | i i d oJ | d i o8 d i g } | i D] } | d | q ~ } n d i | | g } q n t | t o d | i
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i@ ( ( ( R t ExpressionASTTransformerR~ t TemplateASTTransformert visitR5 R R R1 R R R R Ro t optimizedt getCodeRP R+ RB RC RD RE RF RG RH RL ( R? R* R. R1 R2 R3 t treet genR( R t extractR+ ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyR; s8
R Rk Ro R t NotImplementedt Ellipsist ASTTransformerc B s% e Z d Z d Z d Z d Z d Z d Z d Z d Z d Z
d Z d
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Z d Z d Z d Z d Z d Z d Z d Z d Z d Z e Z Z d Z d Z d Z d Z d Z d Z d Z! d Z" e" Z# Z$ Z% Z& Z' e" Z( Z) d Z* e* Z+ Z, e* Z- Z. Z/ Z0 Z1 e* Z2 Z3 d Z4 d! Z5 e5 Z6 Z7 Z8 Z9 e5 Z: Z; d" Z< d# Z= d$ Z> d% Z? d& Z@ d' ZA d( ZB d) ZC d* ZD d+ ZE d, ZF d- ZG d. ZH d/ ZI RS(0 s General purpose base class for AST transformations.
Every visitor method can be overridden to return an AST node that has been
altered or replaced in some way.
c C s} | d j o d St | t j o/ t g } | D] } | | i | q3 ~ St | d | i i | i } | | S( Ns visit%s( R RR t tupleR R RX R t
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d | _ n | S( NR2 t GenExprs ( R R RX R2 R5 R t Classt Functiont LambdaR R R1 ( R= R? Rp R2 ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt _clone s
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c C s | S( N( ( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyR s c C s | i | | i | i S( N( R R R? ( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitExpression s c C s" | i | | i | i | i S( N( R t docR R? ( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitModule s c C s7 | i | g } | i D] } | | i | q ~ S( N( R t nodesR ( R= R? R% R& ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitStmt s c C s | i | | i | i g } | i D] } | | i | q& ~ | i o | i | i p d | i o | i | i p d S( N( R R R? Rp t star_argsR t
dstar_args( R= R? R% R& ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt
visitCallFunc s * c C sR | i | | i g } | i D] } | | i | q ~ | i | i | i S( N( R R( t basesR R R+ ( R= R? R% R& ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt
visitClass s 9c C s t p | i d g j o | St i t i t i d t i d t i | i g d d } t | d o | i
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n | S( Nt *R) R] R2 ( R N( t has_star_import_bugt namesR R t Discardt CallFunct Namet ConstR" R R2 ( R= R? t new_node( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitFrom s -c C s g } t | d o | i | i | i n | i | | | i | i g } | i D] } | | i | qY ~ | i | i | i | i
g S( Nt
decorators( R t appendR R R R( t argnamest defaultst flagsR R+ ( R= R? Rp R% R& ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt
visitFunction s *c C s" | i | | i | i | i S( N( R R t exprt attrname( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitGetattr% s c C sX | i | | i g } | i D] } | | i | q ~ | i | i | i } | S( N( R R R R R R+ ( R= R? R% R& ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitLambda( s 0c C sL | i | | i | i | i g } | i D] } | | i | q, ~ S( N( R R R R t subs( R= R? R% R& ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitSubscript/ s c C s+ | i | | i | i | i | i S( N( R R t testt fail( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitAssert6 s c C sF | i | g } | i D] } | | i | q ~ | i | i S( N( R R R R ( R= R? R% R& ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitAssign9 s 3c C s( | i | | i | i | i | i S( N( R R R R R ( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitAssAttr> s c C s1 | i | | i | i | i | i | i S( N( R R R? t opR ( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitAugAssignC s c C s7 | i | g } | i D] } | | i | q ~ S( N( R R R ( R= R? R% R& ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitDecoratorsH s c C s: | i | | i | i | i | i | i | i S( N( R R R t localsR< ( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitExecK s 'c C sI | i | | i | i | i | i | i | i | i | i S( N( R R t assignt listt bodyt else_( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitForP s 'c C sF | i | g } | i D] } | | i | q ~ | i | i S( N( R t testsR R ( R= R? R% R& ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitIfU s 3c C sF | i | g } | i D] } | | i | q ~ | i | i S( N( R R R t dest( R= R? R% R& ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt _visitPrintZ s 3c C s: | i | | i | i | i | i | i | i S( N( R R t expr1t expr2t expr3( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt
visitRaise` s 'c C s | i | | i | i S( N( R R t value( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitReturne s c C s: | i | | i | i | i | i | i | i S( N( R R R t handlersR ( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitTryExcepth s 'c C s+ | i | | i | i | i | i S( N( R R R t final( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitTryFinallym s c C s: | i | | i | i | i | i | i | i S( N( R R R R R ( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt
visitWhilep s 'c C sU | i | | i | i g } | i D] } | | i | q& ~ | i | i S( N( R R R t varsR ( R= R? R% R& ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitWithu s c C s | i | | i | i S( N( R R R ( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt
visitYieldz s c C s7 | i | g } | i D] } | | i | q ~ S( N( R R R ( R= R? R% R& ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt _visitBoolOp s c C s. | i | | i | i | i | i f S( N( R R t leftt right( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt _visitBinOp s c C sR | i | | i | i g } | i D]" \ } } | | | i | f q& ~ S( N( R R R t ops( R= R? R% R R ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitCompare s c C s | i | | i | i S( N( R R R ( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt
_visitUnaryOp s c C s: | i | | i | i | i | i | i | i S( N( R R R t thenR ( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt
visitIfExp s 'c C sL | i | g } | i D]+ \ } } | | i | | i | f q ~ S( N( R t itemsR ( R= R? R% t kt v( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitDict s c C s | i | | i | i S( N( R R R+ ( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitGenExpr s c C sU | i | | i | i | i | i g } | i D] } | | i | q5 ~ S( N( R R R Ri t ifs( R= R? R% R& ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitGenExprFor s 'c C s | i | | i | i S( N( R R R ( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitGenExprIf s c C sL g } | i D] } | | i | q ~ } | i | | i | i | S( N( t qualsR R R ( R= R? R% R& R ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitGenExprInner s -c C s" | i | | i | i | i S( N( R R( R R ( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitKeyword s c C s7 | i | g } | i D] } | | i | q ~ S( N( R R R ( R= R? R% R ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitList s c C sL g } | i D] } | | i | q ~ } | i | | i | i | S( N( R R R R ( R= R? R% R& R ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt
visitListComp s -c C sU | i | | i | i | i | i g } | i D] } | | i | q5 ~ S( N( R R R R R ( R= R? R% R& ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitListCompFor s 'c C s | i | | i | i S( N( R R R ( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt visitListCompIf s c C sb | i | | i | i | i | i o | i | i p d | i o | i | i p d S( N( R R R R t lowerR t upper( R= R? ( ( s: /usr/lib64/python2.6/site-packages/genshi/template/eval.pyt
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