<s> import logging <EOL> import raco . rules <EOL> from raco import algebra <EOL> from raco . scheme import Scheme <EOL> from raco . backends import Language , Algebra <EOL> from raco . expression import UnnamedAttributeRef , NamedAttributeRef , AttributeRef <EOL> LOGGER = logging . getLogger ( __name__ ) <EOL> counter = <NUM_LIT:0> <EOL> class SPARQLLanguage ( Language ) : <EOL> EQ = "<STR_LIT:=>" <EOL> @ classmethod <EOL> def body ( cls , expr ) : <EOL> return expr . compile ( ) <EOL> @ classmethod <EOL> def compile_attribute ( cls , expr ) : <EOL> if isinstance ( expr , NamedAttributeRef ) : <EOL> var = expr <EOL> if isinstance ( expr , UnnamedAttributeRef ) : <EOL> var = cls . currentop . scheme ( ) . getName ( expr . position ) <EOL> return "<STR_LIT>" % var <EOL> @ classmethod <EOL> def compile_stringliteral ( cls , value ) : <EOL> return str ( value ) . replace ( '<STR_LIT:">' , '<STR_LIT>' ) <EOL> class SPARQLOperator ( object ) : <EOL> language = SPARQLLanguage <EOL> class SPARQLUnionAll ( algebra . UnionAll , SPARQLOperator ) : <EOL> def compile ( self ) : <EOL> return """<STR_LIT>""" % ( self . left . compile ( ) , self . right . compile ( ) ) <EOL> class SPARQLScan ( algebra . Scan , SPARQLOperator ) : <EOL> def renameattrs ( self ) : <EOL> """<STR_LIT>""" <EOL> global counter <EOL> c = counter <EOL> counter = counter + <NUM_LIT:1> <EOL> self . _scheme = Scheme ( [ ( "<STR_LIT>" % ( n , c ) , typ ) <EOL> for n , typ in self . _scheme ] ) <EOL> def __init__ ( self , * args ) : <EOL> super ( self . __class__ , self ) . __init__ ( * args ) <EOL> if self . _scheme : <EOL> self . renameattrs ( ) <EOL> def copy ( self , other ) : <EOL> super ( self . __class__ , self ) . copy ( other ) <EOL> self . renameattrs ( ) <EOL> def compile ( self ) : <EOL> names = self . scheme ( ) . get_names ( ) <EOL> triplepattern = "<STR_LIT:U+0020>" . join ( [ "<STR_LIT>" % n for n in names ] ) <EOL> return "<STR_LIT>" % ( triplepattern ) <EOL> class SPARQLSelect ( algebra . Select , SPARQLOperator ) : <EOL> def compile ( self ) : <EOL> self . language . currentop = self <EOL> filterexpr = self . language . compile_expression ( self . condition ) <EOL> return """<STR_LIT>""" % ( self . input . compile ( ) , filterexpr ) <EOL> class SPARQLStore ( algebra . Store , SPARQLOperator ) : <EOL> def compile ( self ) : <EOL> return """<STR_LIT:%s>""" % ( self . input . compile ( ) ) <EOL> class SPARQLStoreTemp ( SPARQLStore ) : <EOL> pass <EOL> class SPARQLJoin ( algebra . Join , SPARQLOperator ) : <EOL> def compile ( self ) : <EOL> leftc = self . left . compile ( ) <EOL> rightc = self . right . compile ( ) <EOL> self . language . currentop = self <EOL> joincond = self . language . compile_expression ( self . condition ) <EOL> return """<STR_LIT>""" % ( self . left . compile ( ) , self . right . compile ( ) , joincond ) <EOL> class SPARQLApply ( algebra . Apply , SPARQLOperator ) : <EOL> """<STR_LIT>""" <EOL> def compile ( self ) : <EOL> child_scheme = self . input . scheme ( ) <EOL> self . language . currentop = self . input <EOL> def formatemitter ( name , exp ) : <EOL> e = self . language . compile_expression ( exp ) <EOL> if isinstance ( exp , AttributeRef ) : <EOL> return "<STR_LIT:%s>" % e <EOL> else : <EOL> return "<STR_LIT>" % ( e , name ) <EOL> emitters = "<STR_LIT:U+002CU+0020>" . join ( [ formatemitter ( name , exp ) <EOL> for ( name , exp ) in self . emitters ] ) <EOL> return """<STR_LIT>""" % ( emitters , self . input . compile ( ) ) <EOL> class SPARQLAlgebra ( Algebra ) : <EOL> def opt_rules ( self , ** kwargs ) : <EOL> rules = [ <EOL> raco . rules . CrossProduct2Join ( ) , <EOL> raco . rules . SplitSelects ( ) , <EOL> raco . rules . PushSelects ( ) , <EOL> raco . rules . OneToOne ( algebra . Scan , SPARQLScan ) , <EOL> raco . rules . OneToOne ( algebra . Store , SPARQLStore ) , <EOL> raco . rules . OneToOne ( algebra . Select , SPARQLSelect ) , <EOL> raco . rules . OneToOne ( algebra . Apply , SPARQLApply ) , <EOL> raco . rules . OneToOne ( algebra . Join , SPARQLJoin ) , <EOL> ] <EOL> return rules </s>
