Eval
Value = Eval ( Expression AS String [ , Context AS Collection ] ) AS Variant
Evaluates an expression and returns its value. This expression can use almost all operators and subroutines of
Gambas.
The optional context is a collection that must contain the value of each undefined symbol of
Expression.
Example
DIM Context AS New Collection
Context["X"] = 2
Context["Y"] = "Gambas"
PRINT Eval("X * Len(Y)", Context)
12
Assignments
By starting the expression with the
LET keyword, you can evaluate an assignment. In that case, the assigned value is returned.
The assignment expression can use any assignment operators, but cannot use the instructions that return something, like
OPEN,
NEW...
This assigned expression can use almost all operators and subroutines of
Gambas.
Example
Dim Context AS New Collection
Context["X"] = "Liberation Serif"
Print Application.Font.ToString()
Print Eval("Let Application.Font = Font[X]", Context)
Print Application.Font.ToString()
Sans,10
(Font 0x8fae9e8)
Liberation Serif,10
> lang > eval 
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