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f d „ ƒ YZ d „ Z d „ Z d „ Z d „ Z d „ Z d „ Z d „ Z d S( s6 Visitor/traversal interface and library functions.
SQLAlchemy schema and expression constructs rely on a Python-centric
version of the classic "visitor" pattern as the primary way in which
they apply functionality. The most common use of this pattern
is statement compilation, where individual expression classes match
up to rendering methods that produce a string result. Beyond this,
the visitor system is also used to inspect expressions for various
information and patterns, as well as for usage in
some kinds of expression transformation. Other kinds of transformation
use a non-visitor traversal system.
For many examples of how the visit system is used, see the
sqlalchemy.sql.util and the sqlalchemy.sql.compiler modules.
For an introduction to clause adaption, see
http://techspot.zzzeek.org/?p=19 .
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VisitableTypet Visitablet
ClauseVisitort CloningVisitort ReplacingCloningVisitort iteratet iterate_depthfirstt traverse_usingt traverset cloned_traverset replacement_traversec B s e Z d Z d „ Z RS( sy Metaclass which checks for a `__visit_name__` attribute and
applies `_compiler_dispatch` method to classes.
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d „ } | | _ t t | ƒ i | | | ƒ d S( NR t __visit_name__s6 `Visitable` descendants should define `__visit_name__`s visit_%sc s ˆ | ƒ | | S( N( ( t selft visitort kw( t getter( s; /usr/lib/python2.6/site-packages/sqlalchemy/sql/visitors.pyt _compiler_dispatch1 s c [ s t | d | i ƒ | | S( Ns visit_%s( t getattrR
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visit_nameR ( ( R s; /usr/lib/python2.6/site-packages/sqlalchemy/sql/visitors.pyR $ s ( R t
__module__t __doc__R ( ( ( s; /usr/lib/python2.6/site-packages/sqlalchemy/sql/visitors.pyR s c B s e Z d Z e Z RS( sX Base class for visitable objects, applies the
``VisitableType`` metaclass.
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d „ ƒ Z d „ Z RS( s_ Base class for visitor objects which can traverse using
the traverse() function.
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t None( R t objt vt meth( ( s; /usr/lib/python2.6/site-packages/sqlalchemy/sql/visitors.pyt traverse_singleK s
c C s t | | i ƒ S( sO traverse the given expression structure, returning an iterator of all elements.( R t __traverse_options__( R R' ( ( s; /usr/lib/python2.6/site-packages/sqlalchemy/sql/visitors.pyR Q s c C s t | | i | i ƒ S( s2 traverse and visit the given expression structure.( R
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