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Python parse tree definitions.
This is a very concrete parse tree; we need to keep every token and
even the comments and whitespace between tokens.
There's also a pattern matching implementation here.
s# Guido van Rossum <guido@python.org>i����N( t StringIOi���c C sh t sX d d l m } x? | j j � D]+ \ } } t | � t k r& | t | <q& q& Wn t j | | � S( Ni ( t python_symbols( t _type_reprst pygramR t __dict__t itemst typet intt
setdefault( t type_numR t namet val( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt type_repr s t Basec B s� e Z d Z d Z d Z d Z e Z e Z d � Z
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Abstract base class for Node and Leaf.
This provides some default functionality and boilerplate using the
template pattern.
A node may be a subnode of at most one parent.
c O s
t j | � S( s7 Constructor that prevents Base from being instantiated.( t objectt __new__( t clst argst kwds( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyR 2 s c C s# | j | j k r t S| j | � S( sW
Compare two nodes for equality.
This calls the method _eq().
( t __class__t NotImplementedt _eq( t selft other( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt __eq__7 s c C s$ | j | j k r t S| j | � S( sY
Compare two nodes for inequality.
This calls the method _eq().
( R R R ( R R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt __ne__C s c C s
t � d S( s_
Compare two nodes for equality.
This is called by __eq__ and __ne__. It is only called if the two nodes
have the same type. This must be implemented by the concrete subclass.
Nodes should be considered equal if they have the same structure,
ignoring the prefix string and other context information.
N( t NotImplementedError( R R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyR M s c C s
t � d S( sr
Return a cloned (deep) copy of self.
This must be implemented by the concrete subclass.
N( R ( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt cloneX s c C s
t � d S( sx
Return a post-order iterator for the tree.
This must be implemented by the concrete subclass.
N( R ( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt
post_order` s c C s
t � d S( sw
Return a pre-order iterator for the tree.
This must be implemented by the concrete subclass.
N( R ( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt pre_orderh s c C s# t j d t d d �| | _ d S( sv
Set the prefix for the node (see Leaf class).
DEPRECATED; use the prefix property directly.
s3 set_prefix() is deprecated; use the prefix propertyt
stackleveli N( t warningst warnt DeprecationWarningt prefix( R R" ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt
set_prefixp s
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Return the prefix for the node (see Leaf class).
DEPRECATED; use the prefix property directly.
s3 get_prefix() is deprecated; use the prefix propertyR i ( R R R! R" ( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt
get_prefixz s
c C s� t | t � s | g } n g } t } xR | j j D]D } | | k rk | d k rb | j | � n t } q4 | j | � q4 W| j j � | | j _ x | D] } | j | _ q� Wd | _ d S( s/ Replace this node with a new one in the parent.N(
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isinstancet listt Falset parentt childrent Nonet extendt Truet appendt changed( R t newt
l_childrent foundt cht x( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt replace� s
c C s= | } x- t | t � s5 | j s% d S| j d } q W| j S( s9 Return the line number which generated the invocant node.Ni ( R% t LeafR) t lineno( R t node( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt
get_lineno� s c C s& | j r | j j � n t | _ d S( N( R( R. R, t was_changed( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyR. � s c C sf | j rb xV t | j j � D]? \ } } | | k r | j j � | j j | =d | _ | Sq Wn d S( s�
Remove the node from the tree. Returns the position of the node in its
parent's children before it was removed.
N( R( t enumerateR) R. R* ( R t iR7 ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt remove� s
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The node immediately following the invocant in their parent's children
list. If the invocant does not have a next sibling, it is None
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IndexError( R R; t child( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt next_sibling� s
c C sh | j d k r d SxN t | j j � D]: \ } } | | k r& | d k rN d S| j j | d Sq& Wd S( s�
The node immediately preceding the invocant in their parent's children
list. If the invocant does not have a previous sibling, it is None.
i i N( R( R* R: R) ( R R; R> ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt prev_sibling� s c c s4 x- | j D]" } x | j � D] } | Vq Wq
Wd S( N( R) t leaves( R R> R3 ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRA � s c C s$ | j d k r d Sd | j j � S( Ni i ( R( R* t depth( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRB � s c C s | j } | d k r d S| j S( s�
Return the string immediately following the invocant node. This is
effectively equivalent to node.next_sibling.prefix
u N( R? R* R" ( R t next_sib( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt
get_suffix� s i i c C s t | � j d � S( Nt ascii( t unicodet encode( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt __str__� s N( ( i i (! t __name__t
__module__t __doc__R* R R( R) R' R9 t was_checkedR R t __hash__R R R R R R# R$ R4 R8 R. R< t propertyR? R@ RA RB RD t syst version_infoRH ( ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyR
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� Z d � Z RS( s+ Concrete implementation for interior nodes.c C sm | | _ t | � | _ x | j D] } | | _ q" W| d k rM | | _ n | r` | | _ n d | _ d S( s�
Initializer.
Takes a type constant (a symbol number >= 256), a sequence of
child nodes, and an optional context keyword argument.
As a side effect, the parent pointers of the children are updated.
N( R R& R) R( R* R" t fixers_applied( R R R) t contextR" RR R2 ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt __init__� s
c C s# d | j j t | j � | j f S( s) Return a canonical string representation.s
%s(%s, %r)( R RI R R R) ( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt __repr__ s c C s d j t t | j � � S( sk
Return a pretty string representation.
This reproduces the input source exactly.
u ( t joint mapRF R) ( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt __unicode__ s i i c C s" | j | j f | j | j f k S( s Compare two nodes for equality.( R R) ( R R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyR s c C s5 t | j g | j D] } | j � ^ q d | j �S( s$ Return a cloned (deep) copy of self.RR ( RQ R R) R RR ( R R2 ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyR ! s +c c s9 x- | j D]" } x | j � D] } | Vq Wq
W| Vd S( s* Return a post-order iterator for the tree.N( R) R ( R R> R7 ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyR & s
c c s9 | Vx- | j D]" } x | j � D] } | Vq" Wq Wd S( s) Return a pre-order iterator for the tree.N( R) R ( R R> R7 ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyR - s c C s | j s
d S| j d j S( sO
The whitespace and comments preceding this node in the input.
t i ( R) R" ( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt _prefix_getter4 s c C s | j r | | j d _ n d S( Ni ( R) R" ( R R" ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt _prefix_setter< s c C s4 | | _ d | j | _ | | j | <| j � d S( s�
Equivalent to 'node.children[i] = child'. This method also sets the
child's parent attribute appropriately.
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Equivalent to 'node.children.insert(i, child)'. This method also sets
the child's parent attribute appropriately.
N( R( R) t insertR. ( R R; R> ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt insert_childL s c C s' | | _ | j j | � | j � d S( s�
Equivalent to 'node.children.append(child)'. This method also sets the
child's parent attribute appropriately.
N( R( R) R- R. ( R R> ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt append_childU s N( i i ( RI RJ RK R* RT RU RX RO RP RH R R R R RZ R[ RN R" R\ R^ R_ ( ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRQ � s$
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� Z e e e � Z RS( s' Concrete implementation for leaf nodes.RY i c C sb | d k r* | \ | _ \ | _ | _ n | | _ | | _ | d k rT | | _ n | | _ d S( s�
Initializer.
Takes a type constant (a token number < 256), a string value, and an
optional context keyword argument.
N( R* t _prefixR6 t columnR t valueRR ( R R Rb RS R" RR ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRT h s c C s d | j j | j | j f S( s) Return a canonical string representation.s
%s(%r, %r)( R RI R Rb ( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRU { s c C s | j t | j � S( sk
Return a pretty string representation.
This reproduces the input source exactly.
( R" RF Rb ( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRX � s i c C s" | j | j f | j | j f k S( s Compare two nodes for equality.( R Rb ( R R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyR � s c C s4 t | j | j | j | j | j f f d | j �S( s$ Return a cloned (deep) copy of self.RR ( R5 R Rb R" R6 Ra RR ( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyR � s c c s | Vd S( N( ( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRA � s c c s | Vd S( s* Return a post-order iterator for the tree.N( ( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyR � s c c s | Vd S( s) Return a pre-order iterator for the tree.N( ( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyR � s c C s | j S( sP
The whitespace and comments preceding this token in the input.
( R` ( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRZ � s c C s | j � | | _ d S( N( R. R` ( R R" ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyR[ � s
N( i i ( RI RJ RK R` R6 Ra R* RT RU RX RO RP RH R R RA R R RZ R[ RN R" ( ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyR5 _ s& c C sk | \ } } } } | s' | | j k rT t | � d k rA | d St | | d | �St | | d | �Sd S( s�
Convert raw node information to a Node or Leaf instance.
This is passed to the parser driver which calls it whenever a reduction of a
grammar rule produces a new complete node, so that the tree is build
strictly bottom-up.
i i RS N( t
number2symbolt lenRQ R5 ( t grt raw_nodeR Rb RS R) ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt convert� s t BasePatternc B s\ e Z d Z d Z d Z d Z d � Z d � Z d � Z d d � Z
d d � Z d � Z RS( s�
A pattern is a tree matching pattern.
It looks for a specific node type (token or symbol), and
optionally for a specific content.
This is an abstract base class. There are three concrete
subclasses:
- LeafPattern matches a single leaf node;
- NodePattern matches a single node (usually non-leaf);
- WildcardPattern matches a sequence of nodes of variable length.
c O s
t j | � S( s> Constructor that prevents BasePattern from being instantiated.( R R ( R R R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyR � s c C sh t | j � | j | j g } x! | rA | d d k rA | d =q! Wd | j j d j t t | � � f S( Ni����s %s(%s)s , (
R R t contentR
R* R RI RV RW t repr( R R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRU � s c C s | S( s�
A subclass can define this as a hook for optimizations.
Returns either self or another node with the same effect.
( ( R ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt optimize� s c C s� | j d k r% | j | j k r% t S| j d k r~ d } | d k rO i } n | j | | � se t S| r~ | j | � q~ n | d k r� | j r� | | | j <n t S( s#
Does this pattern exactly match a node?
Returns True if it matches, False if not.
If results is not None, it must be a dict which will be
updated with the nodes matching named subpatterns.
Default implementation for non-wildcard patterns.
N( R R* R' Ri t _submatcht updateR
R, ( R R7 t resultst r( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt match� s ! c C s* t | � d k r t S| j | d | � S( s�
Does this pattern exactly match a sequence of nodes?
Default implementation for non-wildcard patterns.
i i ( Rd R' Rp ( R t nodesRn ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt match_seq s c c s4 i } | r0 | j | d | � r0 d | f Vn d S( s}
Generator yielding all matches for this pattern.
Default implementation for non-wildcard patterns.
i i N( Rp ( R Rq Ro ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyt generate_matches s N(
RI RJ RK R* R Ri R
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t LeafPatternc B s2 e Z d d d d � Z d d � Z d d � Z RS( c C s= | d k r n | d k r n | | _ | | _ | | _ d S( sp
Initializer. Takes optional type, content, and name.
The type, if given must be a token type (< 256). If not given,
this matches any *leaf* node; the content may still be required.
The content, if given, must be a string.
If a name is given, the matching node is stored in the results
dict under that key.
N( R* R Ri R
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( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRT s c C s& t | t � s t St j | | | � S( s* Override match() to insist on a leaf node.( R% R5 R' Rh Rp ( R R7 Rn ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRp , s c C s | j | j k S( s�
Match the pattern's content to the node's children.
This assumes the node type matches and self.content is not None.
Returns True if it matches, False if not.
If results is not None, it must be a dict which will be
updated with the nodes matching named subpatterns.
When returning False, the results dict may still be updated.
( Ri Rb ( R R7 Rn ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRl 2 s
N( RI RJ R* RT Rp Rl ( ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRt s t NodePatternc B s, e Z e Z d d d d � Z d d � Z RS( c C s� | d k r n | d k rb t | � } x8 t | � D]' \ } } t | t � r4 t | _ q4 q4 Wn | | _ | | _ | | _ d S( sd
Initializer. Takes optional type, content, and name.
The type, if given, must be a symbol type (>= 256). If the
type is None this matches *any* single node (leaf or not),
except if content is not None, in which it only matches
non-leaf nodes that also match the content pattern.
The content, if not None, must be a sequence of Patterns that
must match the node's children exactly. If the content is
given, the type must not be None.
If a name is given, the matching node is stored in the results
dict under that key.
N(
R* R& R: R% t WildcardPatternR, t wildcardsR Ri R
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R; t item( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRT F s c C s� | j rh xX t | j | j � D]A \ } } | t | j � k r | d k r\ | j | � n t Sq Wt St | j � t | j � k r� t Sx9 t | j | j � D]" \ } } | j
| | � s� t Sq� Wt S( s�
Match the pattern's content to the node's children.
This assumes the node type matches and self.content is not None.
Returns True if it matches, False if not.
If results is not None, it must be a dict which will be
updated with the nodes matching named subpatterns.
When returning False, the results dict may still be updated.
N( Rw Rs Ri R) Rd R* Rm R, R' t zipRp ( R R7 Rn t cRo t
subpatternR> ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRl c s
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d � Z d
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A wildcard pattern can match zero or more nodes.
This has all the flexibility needed to implement patterns like:
.* .+ .? .{m,n}
(a b c | d e | f)
(...)* (...)+ (...)? (...){m,n}
except it always uses non-greedy matching.
i c C s] | d k r5 t t t | � � } x | D] } q( Wn | | _ | | _ | | _ | | _ d S( s�
Initializer.
Args:
content: optional sequence of subsequences of patterns;
if absent, matches one node;
if present, each subsequence is an alternative [*]
min: optional minimum number of times to match, default 0
max: optional maximum number of times to match, default HUGE
name: optional name assigned to this match
[*] Thus, if content is [[a, b, c], [d, e], [f, g, h]] this is
equivalent to (a b c | d e | f g h); if content is None,
this is equivalent to '.' in regular expression terms.
The min and max parameters work as follows:
min=0, max=maxint: .*
min=1, max=maxint: .+
min=0, max=1: .?
min=1, max=1: .
If content is not None, replace the dot with the parenthesized
list of alternatives, e.g. (a b c | d e | f g h)*
N( R* t tupleRW Ri t mint maxR
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t alt( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRT � s
c C s/ d } | j d k rW t | j � d k rW t | j d � d k rW | j d d } n | j d k r� | j d k r� | j d k r� t d | j � S| d k r� | j | j k r� | j � Sn | j d k r+t | t � r+| j d k r+| j | j k r+t | j | j | j | j | j | j � S| S( s+ Optimize certain stacked wildcard patterns.i i R
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c C s | j | g | � S( s' Does this pattern exactly match a node?( Rr ( R R7 Rn ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRp � s c C su xn | j | � D]] \ } } | t | � k r | d k ri | j | � | j ri t | � | | j <qi n t Sq Wt S( s4 Does this pattern exactly match a sequence of nodes?N( Rs Rd R* Rm R
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c c s� | j d k rs xvt | j d t t | � | j � � D]4 } i } | j ra | | | | j <n | | f Vq8 Wn| j d k r� | j | � Vn� t t d � r� t j
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Generator yielding matches for a sequence of nodes.
Args:
nodes: sequence of nodes
Yields:
(count, results) tuples where:
count: the match comprises nodes[:count];
results: dict containing named submatches.
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Initializer.
The argument is either a pattern or None. If it is None, this
only matches an empty sequence (effectively '$' in regex
lingo). If it is not None, this matches whenever the argument
pattern doesn't have any matches.
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\ } } d SWd i f Vd S( Ni ( Ri R* Rd Rs ( R Rq Rz Ro ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyRs R s N( RI RJ R* RT Rp Rr Rs ( ( ( s3 /opt/alt/python27/lib64/python2.7/lib2to3/pytree.pyR� ; s
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Generator yielding matches for a sequence of patterns and nodes.
Args:
patterns: a sequence of patterns
nodes: a sequence of nodes
Yields:
(count, results) tuples where:
count: the entire sequence of patterns matches nodes[:count];
results: dict containing named submatches.
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