| << loadunit << | Table Of Contents | >> logicalflagexpression >> |
| Keyword | logicalexpression |
| Purpose | A logical expression is a combination of operands and mathematical operations. The final result of a logical expression is always true or false. Logical expressions are used the reduce the properties in a report to a certain subset or to select alternatives for the cell content of a table. When used with attributes like hidetask or hideresource the logical expression evaluates to true for a certain property, this property is hidden or rolled-up in the report. Operands can be previously declared flags, built-in functions, property attributes (specified as scenario.attribute) or another logical expression. When you combine logical operations to a more complex expression, the operators are evaluated from left to right. a | b & c is identical to (a | b) & c. It's highly recommended that you always use brackets to control the evaluation sequence. Currently, TaskJuggler does not support the concept of operator precedence or right-left associativity. This may change in the future. An operand can also be just a number. 0 evaluates to false, all other numbers to true. |
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| Syntax | <operand> [(| | & | > | < | = | >= | <= | !=) <operand>...] |
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| Arguments | operand | An operand can consist of a date, a text string, a function, a property attribute or a numerical value. It can also be the name of a declared flag. Use the An operand can be a negated operand by prefixing a ~ charater or it can be another logical expression enclosed in braces. |
| | | The 'or' operator |
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| & | The 'and' operator |
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| > | The 'greater than' operator |
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| < | The 'smaller than' operator |
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| = | The 'equal' operator |
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| >= | The 'greater-or-equal' operator |
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| <= | The 'smaller-or-equal' operator |
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| != | The 'not-equal' operator |
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| Context | Global scope | |
| See also | functions | |
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