Eclipse Community Forums: TMF (Xtext) » xtext arithmetics operation

Help

Home

Home » Modeling » TMF (Xtext) » xtext arithmetics operation

Show: Today's Messages :: Show Polls :: Message Navigator

xtext arithmetics operation [message #899784]

Thu, 02 August 2012 10:52

Laigle jérôme

Messages: 26
Registered: August 2012

Junior Member

Hi,

I'm working on a DSL I want to support addition soustraction division multiplication of variable or number for example

a+b*a
a+b/3
2+4

So, I've started with the following construct

OperateurArithmetiques:
Addition;

Addition returns OperateurArithmetiques:
Multiplication (({Plus.left=current} '+' | {Minus.left=current} '-') right=Multiplication)*;

Multiplication returns OperateurArithmetiques:
PrimaryExpression (({Multi.left=current} '*' | {Div.left=current} '/') right=PrimaryExpression)*;

PrimaryExpression returns OperateurArithmetiques:
'(' OperateurArithmetiques ')'
| {NumberLiteral}value=NUMBER
| name=[VariableDeclaration]

;

i realise test with xtend in parallel
and test doesn't work

my first test:
val compilationUnit =
'''
program MyProgramme
segment 0

(2+3)
eseg 0
end
'''.parse

val abalElement = compilationUnit.abalElements.head
val program = abalElement as Program
val segment= program.segment.get(0)

val expression= segment.body.get(0)
Assert::assertNotNull(expression)
Assert::assertTrue(expression instanceof OperateurArithmetiques)
val operateurArithmetiques=expression as OperateurArithmetiques
Assert::assertNotNull(operateurArithmetiques)
Assert::assertTrue(operateurArithmetiques instanceof Plus)
val plus=operateurArithmetiques as Plus
Assert::assertNotNull(plus)
Assert::assertEquals('2',plus.left)

plus.left is null i don't understand why

my second test :

val compilationUnit =
'''
program MyProgramme
segment 0

(a+b)
eseg 0
end
'''.parse

val abalElement = compilationUnit.abalElements.head
val program = abalElement as Program
val segment= program.segment.get(0)

val expression= segment.body.get(0)
Assert::assertNotNull(expression)
Assert::assertTrue(expression instanceof OperateurArithmetiques)
val operateurArithmetiques=expression as OperateurArithmetiques
Assert::assertNotNull(operateurArithmetiques)
Assert::assertTrue(operateurArithmetiques instanceof Plus)
val plus=operateurArithmetiques as Plus
Assert::assertNotNull(plus)
Assert::assertEquals('a',plus.left)
xtend error
junit.framework.AssertionFailedError: expected:<a> but was:<OperateurArithmetiquesImpl@2793d5d7>

Best regards,
Jérôme

Report message to a moderator