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2.5.2. Number Expressions
Number Expressions
UIMA Ruta provides several possibilities to define number expressions. As expected, every
number expression evaluates to a number. UIMA Ruta supports integer and floating-point numbers.
A floating-point number can be in single or in double precision. To get a complete overview, have
a look at the following syntax definition of number expressions.
2.5.2.1. Definition:
NumberExpression -> AdditiveExpression
AdditiveExpression -> MultiplicativeExpression ( ( "+" | "-" )
MultiplicativeExpression )*
MultiplicativeExpression -> SimpleNumberExpression ( ( "*" | "/" | "%" )
SimpleNumberExpression )*
| ( "EXP" | "LOGN" | "SIN" | "COS" | "TAN" )
"(" NumberExpression ")"
SimpleNumberExpression -> "-"? ( DecimalLiteral | FloatingPointLiteral
| NumberVariable) | "(" NumberExpression ")"
DecimalLiteral -> ('0' | '1'..'9' Digit*) IntegerTypeSuffix?
IntegerTypeSuffix -> ('l'|'L')
FloatingPointLiteral -> Digit+ '.' Digit* Exponent? FloatTypeSuffix?
| '.' Digit+ Exponent? FloatTypeSuffix?
| Digit+ Exponent FloatTypeSuffix?
| Digit+ Exponent? FloatTypeSuffix
FloatTypeSuffix -> ('f'|'F'|'d'|'D')
Exponent -> ('e'|'E') ('+'|'-')? Digit+
Digit -> ('0'..'9')
For more information on number variables, see Section 2.4.2, “Variables” [24] .
2.5.2.2. Examples:
98 // a integer number literal
104 // a integer number literal
170.02 // a floating-point number literal
1.0845 // a floating-point number literal
INT intVar1;
INT intVar2;
...
Document{->ASSIGN(intVar1, 12 * intVar1 - SIN(intVar2))};
2.5.3. String Expressions
There are two kinds of string expressions in UIMA Ruta.
1. String literals: String literals are defined by any sequence of characters within quotation
marks.
2. String variables (see Section 2.4.2, “Variables” [24] )
2.5.3.1. Definition:
StringExpression -> SimpleStringExpression
SimpleStringExpression -> StringLiteral ("+" StringExpression)*
UIMA Ruta Version 2.0.1 Apache UIMA Ruta Language 27