Expressions
Expressions usage within the OpenDataDSL language
Syntax
Expressions can take various forms, so here is a list of the syntax for expressions:
// A simple variable (either existence or true)
variable
// Not variable (either non-existence or false)
not variable
// Use of braces for explicit precedence
( expression )
// Array operators
[ expression (, expression)* ]
// Mathematical Operators
expression * expression
expression / expression
expression + expression
expression - expression
expression ^ expression
// Logical Operators
expression == expression
expression = expression
expression != expression
expression < expression
expression <= expression
expression > expression
expression >= expression
// Geospatial and Special
expression like expression
expression intersects expression
expression within expression
// Filter creation (usually used with event time series or event curves)
? condition
Use within the language
Expressions are used in various places within the ODSL language as shown in the following table:
| Command | Description |
|---|---|
| Assignment | When assigning a value to a variable |
| Printing | When printing a message to the terminal |
| Logging | When logging a message |
| Return | When returning a value from a script |
| Fail and Abort | Creating a message when instructing a workflow to fail or abort |
| Type declaration | Adding an expression as a property on a type |
| Extractor | Used as a selector, check, click etc. in an extractor |
| For | Used in defining a for statement |
| Active variable | Used as a name and options for an active variable |
| Method and function calls | Used as a parameter in method and function calls |
Examples
Assignment examples
result = a + 1
Creating a filter on an event series
event_series.filter = ? side = "ASK" and relative = "M01"
Printing example
print “Hello “ + name
Logging example
log info “Value is “ + value
Return example
return a + 1
Fail example
fail “Value is “ + value
Type declaration example
name as first + “ “ + last
For example
for i=a+10 to a+20
next
for i in [1,2,3]
next
Methods and function calls
l.addAll([1,2,3])