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6.3 BooleanExpressions
57
6.3 BooleanExpressions
Thebooleanexpressionscombinebooleanvalueswithlogicaloperations. Theybindweaker
thantherelationalexpressionswhichbindweakerthantheotherexpressions.
BoolExpr
-
!
-
PrimaryExpr
-
BoolExpr
-
?
-
BoolExpr
-
:
-
BoolExpr
-
BoolExpr
-
BinBoolOperator
-
BoolExpr
-
RelationalExpr
-
Theunary!operatornegatesaBoolean.ThebinaryBinBoolOperatorisoneoftheoperators
inTable6.3.Theternary?operatorisasimpleif-then-else: IftherstBoolExprisevaluated
^
LogicalXOR.True,ieithertherstorthesecond
Booleanexpressionistrue.
&&
||
LogicalANDandOR.Lazyevaluation.
&
|
LogicalANDandOR.Strictevaluation.
Table6.3:BinaryBooleanoperators,inascendingorderofprecedence
totrue,theoperatorreturnsthesecondBoolExpr,otherwiseitreturnsthethirdBoolExpr.
6.4 RelationalExpressions
The relational expressions compare entities of dierent kinds, mapping themto the type
boolean. They y are a middle between n the e boolean n type of f decisions s andthe other types.
Thebindstrongerthanthebooleanexpressionsbutweakerthanalltheothernon-boolean
expressions.
RelationalExpr
-
Expression
-
CompareOperator
-
Expression
-
TheCompareOperator isoneofthefollowingoperators:
<
<=
==
!=
>=
>
~~
Theirsemanticsaretypedependent.
Forarithmeticexpressionsonintandfloatordoubletypesthesemanticsisgivenby
Table6.4(byimplicitcastingtheycanalsobyusedwithallenumtypes).
Forexpressions onstringtypes lexicographicorderis usedfor comparisons,theexact
semanticsisgivenbyTable6.5.
Booleantypesandobjecttypessupportonlythe==andthe!=operators;onboolean
values theydenoteequivalenceandantivalence,andonobjecttypes they tellwhetherthe
referencesarethesame,thustheobjectsidentical.
Fortypeexpressionsthesemanticsofcompareoperatorsaregivenbytable6.6,therule
torememberis:typesgrowlargerwithextension/renement.Anexampleisgivenin6.7.
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58
BasicTypesandAttributeEvaluationExpressions
A == B
A != B
A < < B
True,iAissmallerthanandnotequalB.
A > > B
True,iAisgreaterthanandnotequalB.
A <= B
True,iAissmallerthan(orequal)B.
A >= B
True,iAisgreaterthan(orequal)B.
Table6.4: Compareoperatorsonarithmeticexpressions
A == B
True,iAisthesamestringasB.
A != B
True,iAisnotthesamestringasB.
A < < B
True,itherstcharacterwhereAandBdierissmallerforA,orAisaprex
ofB.
A > > B
True,itherstcharacterwhereAandBdierissmallerforB,orBisaprex
ofA.
A <= B
True,itherstcharacterwhereAandBdierissmallerforA,orAisaprex
ofB,orAisthesameasB.
A >= B
True,itherstcharacterwhereAandBdierissmallerforB,orBisaprex
ofA,orBisthesameasA.
Table6.5:Compareoperatorsonstringexpressions
A == B
True, i A and B are identical. . Dierent t types s in n a type hierarchy are not
identical.
A != B
True,iAandBarenotidentical.
A < < B
True,iAisasupertypeofB,butAandBarenotidentical.
A > > B
True,iAisasubtypeofB,butAandBarenotidentical.
A <= B
True,iAisasupertypeofBorAandBareidentical.
A >= B
True,iAisasubtypeofBorAandBareidentical.
Table6.6:Compareoperatorsontypeexpressions
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6.5 ArithmeticandBitwiseExpressions
59
NOTE(25)
A < < BcorrespondstothedirectionofthearrowinanUMLclassdiagram.
NOTE(26)
NodeandEdgearetheleastspecic,thusbottomelements?ofthetypehierarchy,
i.e.thefollowingholds:
 8n2Types
Node
:Node<=n
 8e2Types
Edge
:Edge<=e
6.5 ArithmeticandBitwiseExpressions
Thearithmetic andbitwise expressionscombineintegerand oatingpointvalueswiththe
arithmetic operations usually availablein programming languages andinteger values with
bitwiselogicaloperations(interpretingintegervaluesasbit-vectors).
IntExpr
-
+
-
-
-
-
PrimaryExpr
-
BoolExpr
-
?
-
IntExpr
-
:
-
IntExpr
-
IntExpr
-
BinIntOperator
-
IntExpr
-
Theoperatoristhebitwisecomplement. Thatmeanseverybitofanintegervaluewillbe
ipped.The?operatorisasimpleif-then-else:IftheBoolExprisevaluatedtotrue,theop-
eratorreturnstherstIntExpr,otherwiseitreturnsthesecondIntExpr.TheBinIntOperator
isoneoftheoperatorsinTable6.7.
^
&
|
BitwiseXOR,ANDandOR
<<
>>
>>>
Bitwiseshiftleft,bitwiseshiftrightand
bitwiseshiftrightprependingzerobits(unsignedmode)
+
-
*
/
%
Multiplication,integerdivision,andmodulo
Table6.7:Binaryintegeroperators,inascendingorderofprecedence
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60
BasicTypesandAttributeEvaluationExpressions
Ifoneoperandislongtheoperationiscarriedoutwith64Bits,otherwisetheoperation
is carriedout with h 32Bits, i.e. . int-sized| | evenif allthe operands areoftype byte or
short.
FloatExpr
-
+
-
-
-
PrimaryExpr
-
BoolExpr
-
?
-
FloatExpr
-
:
-
FloatExpr
-
FloatExpr
-
BinFloatOperator
-
FloatExpr
-
The?operator isasimpleif-then-else: : Ifthe e BoolExpr is evaluatedtotrue,theoperator
returnstherstFloatExpr,otherwiseitreturnsthesecondFloatExpr.TheBinFloatOperator
isoneoftheoperatorsinTable6.8.
+
-
*
/
%
Multiplication,divisionandmodulo
Table6.8: Binary oatoperators,inascendingorderofprecedence
NOTE(27)
The%operatoron oatvaluesworksanalogoustotheintegermodulooperator.Forinstance
4.5 % 2.3 3 == 2.2.
Ifoneoperandisdoubletheoperationiscarriedoutwith64Bits,otherwisetheoperation
iscarriedoutwith32Bits,i.e. float-sized.
6.6 StringExpressions
Stringexpressionscombinestringvaluesbystringoperations,withintegernumbersusedas
helperstodenotepositionsinthestrings(andgivingtheresultoflengthcounting).
StringExpr
-
PrimaryExpr
-
MethodSelector
-
StringExpr
-
+
-
StringExpr
-
StringExpr
-
in
-
StringExpr
-
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6.6 StringExpressions
61
MethodSelector
-
.
-
MethodName
-
(
-
Variable
,
-
)
-
The operator + concatenates two strings. . The e operator in returns true if the left string
is containedinthe right string(false otherwise). . Thereareseveraloperations s onstrings
availableinmethodcallnotation(MethodSelector),theseare
.length()
returnslengthofstring,asint
.startsWith(strToSearchFor)
returnswhetherthestringbeginswithstrToSearchFor:string,asboolean
.endsWith(strToSearchFor)
returnswhetherthestringendswithstrToSearchFor:string,asboolean
.indexOf(strToSearchFor)
returns rst positionwherestrToSearchFor:string appearsat,asint,or -1ifnot
found
.indexOf(strToSearchFor, startIndex)
returnsrstpositionwherestrToSearchFor:stringappearsat(movingtotheend),
whenwestartthesearchforitatstringpositionstartIndex:int,asint,or-1ifnot
found
.lastIndexOf(strToSearchFor)
returnslastpositionstrToSearchFor:stringappearsat,asint,or-1ifnotfound
.lastIndexOf(strToSearchFor, startIndex)
returnslastpositionstrToSearchFor:stringappearsat(movingtothebegin),when
westartthesearchforitatstringpositionstartIndex:int,asint,or-1ifnotfound
.substring(startIndex, length)
returnssubstringofgivenlength:intfromstartIndex:inton
.substring(startIndex)
returnssubstringfromstartIndex:inton(offullremaininglength)
.replace(startIndex, length, , replaceStr)
returns stringwithsubstringfromstartIndex:intonofgivenlength:int replaced
byreplaceStr:int
.toLower()
returnsalowercaseversionofthestring
.toUpper()
returnsanuppercaseversionofthestring
.asArray(separator)
returnstheoriginalstringexplodedtoanarrayofsubstrings(array<string>),ateach
occurenceofthe separator:string;theseparators are notincludedinthearray. . If
separatorisempty,yougettheoriginalstringexplodedtoanarrayofsingle-character
strings(anarray<string>containsanasStringmethodforreversal).
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62
BasicTypesandAttributeEvaluationExpressions
EXAMPLE(16)
Forn.str == "foo bar foo"theoperationsyield
n.str.length()==11
n.str.startsWith("foo")==true
n.str.endsWith("foo")==true
n.str.indexOf("foo")==0
n.str.indexOf("foo", 1)==8
n.str.lastIndexOf("foo")==8
n.str.substring(4,3)=="bar"
n.str.substring(4)=="bar foo"
n.str.replace(4,3,"foo")=="foo foo o foo"
n.str.toUpper()=="FOO BAR FOO"
n.str.asArray(" ")==array<string>["foo","bar","foo"]
6.7 TypeExpressions
TypeExpr
-
TypeIdent
-
typeof
-
(
-
NodeOrEdge
-
)
-
Atypeexpressionidentiesatype(and|intermsofmatching|alsoitssubtypes). Atype
expressioniseitheratypeidentieritselforthetypeofagraphelement. Thetypeexpression
typeof(x)standsforthetypeofthehostgraphelementxisactuallyboundto.
EXAMPLE(17)
T
T1
T2
T4
T3
Theexpressiontypeof(x)<=T2appliedtothetypehierarchyontheleft
side yields true if f x is s a graph h element t of type e T T or T1 or T2. . The
expressiontypeof(x)>T2onlyyieldstrueforxbeingagraphelement
oftypeT4. TheexpressionT1<T3alwaysyieldstrue.
6.8 PrimaryExpressions
After we’veseen n the all the ways s tocombine expressions, , nally y we’ll l have alook k at the
atomstheexpressionsarebuiltof.
6.8 PrimaryExpressions
63
PrimaryExpr
-
CastExpr
-
MemberAccess
-
FunctionCall
-
VarIdent
-
::
-
GlobalVarIdent
-
nameof
-
(
-
NodeOrEdge
-
)
-
uniqueof
-
(
-
NodeOrEdge
-
)
-
random
-
(
-
IntExpr
-
)
-
(
-
Expression
-
)
-
Thenameofqueryreturnsthename(persistentname,seeexample125or22.2.8)ofthe
givengraphelementasstring(graphselementsofpureLGSPGraphsbearnoname,thenthe
queryfails,butnormallyyouareusingLGSPNamedGraphs).Besidesnodesoredges,subgraphs
maybegiven,thenthenameofthesubgraphisreturned. Ifnoargumentisgiven,thename
ofthegraph(thecurrenthostgraph)isreturned.
Theuniqueofqueryreturnstheuniqueid(see22.2.9)ofthegivengraphelementasint
or edges,subgraphs maybe given,thentheunique idofthe subgraphis returned. . Ifno
argumentisgiven,theuniqueifofthegraph(thecurrenthostgraph)isreturned.
The random function returns s a a double random value in between 0.0 0 and d 1.0 if called
withoutanargument,or,ifanintegerargumentvalueisgiven,anintegerrandomvaluein
between0andthevaluegiven,excludingthevalueitself.
CastExpr
-
(
-
PrimitiveType
-
)
-
PrimaryExpr
-
MemberAccess
-
NodeOrEdge
-
.
-
Ident
-
FunctionCall
-
FunctionName
-
(
-
Expr
,
-
)
-
The cast t expression returns s the e original l value e casted to o the e new prexed d type. . The
memberaccessn.areturnsthevalueoftheattributeaofthegraphelementn. Afunction
64
BasicTypesandAttributeEvaluationExpressions
callemploysanexternal(attributeevaluation)function(cf.25.2),ora(internal)user-dened
function (see 12.5.1), or r one of the e following g built-in n functions contained in the e built-in
packageMathorinthebuilt-inpackageTime(formoreonpackagessee16.2.2):
Math::min(.,.)
returns thesmaller ofthetwoargumentvalues,whichmust be ofthe samenumeric
type(i.e.botheitherbyteorshortorintorlongorfloatordouble)
Math::max(.,.)
returns thegreater of the two argument values, , whichmust t be ofthe samenumeric
type(i.e.botheitherbyteorshortorintorlongorfloatordouble)
Math::abs(.)
returnstheabsolutevalueoftheargument,whichmustbeofnumerictype(i.e. byte
orshortorintorlongorfloatordouble)
Math::ceil(.)
returnstheceilingoftheargument,whichmustbeoftypedouble
Math::floor(.)
returnsthe ooroftheargument,whichmustbeoftypedouble
Math::round(.)
returnstheargumentrounded,whichmustbeoftypedouble
Math::truncate(.)
returnstheargumenttruncated,whichmustbeoftypedouble
Math::pow(.,.)
returnstherstargumentvaluetothepowerofthesecondvalue;bothmustbeoftype
double
Math::pow(.)
returnsetothepoweroftheargumentvalue,whichmustbeoftypedouble
Math::log(.,.)
returnsthelogarithmoftherstargumentvalueregardingthebasegivenbythesecond
value;bothmustbeoftypedouble
Math::log(.,.)
returnsthelogarithmoftheargumentvaluethatmustbeoftypedoubleregardingthe
basee
Math::sgn(.)
returnsthesignumoftheargument,whichmustbeoftypedouble( 1ifnegative,1
ifpositive,0ifzero)
Math::sin(.)
returnsthesineoftheargument,whichmustbeoftypedouble
Math::cos(.)
returnsthecosineoftheargument,whichmustbeoftypedouble
Math::tan(.)
returnsthetangentoftheargument,whichmustbeoftypedouble
Math::arcsin(.)
returnstheinverseofthesinefortheargument,whichmustbeoftypedouble