How to print the parameters of a specific method?
Parameters don't have types so you can't print those. It seems that you want to print the method header which provides the name of the method and the names of the parameters. You already have the name of the method so you need to get the names of the parameters. The only way to get the names of the parameters is from the original source string. Here's a nice way to extract the parameter names from the source string. In this example, I'm getting the name of the parameter of the printOn: method in class Object.
(Parser new parse: (Object sourceCodeAt: #printOn:) class: Object) arguments
collect: [:each | each name]
In Pharo3 it is even easier:
(Object>>#printOn:) argumentNames
Related
I am setting expectations for a method that takes a single IList<> parameter.
How do I express in NMock3 the following statement:
Method XX of the mock should be called exactly once with a list object that contains exactly one item.
The solution I imagine would be something like the following:
theMock.Expects.One.Method(_ =>_XX(null)).With(***mystery-mocking-goes-here***);
Use Is.Match:
theMock.Expects.One.Method(_ =>_XX(null)).With(Is.Match<IList<string>>(l => l.Count == 1));
Explanation for Anantha Raju C
If you have a method to test _XX(T). In the With method you have to pass a T object or a matcher. Is.Match create it and need a Predicate as argument.
In this example, the Predicate will return true if the list contains only one item (l.Count == 1).
Can I define an ABAP method where the RETURNING parameter and any IMPORTING parameters have a generic type but that can still be called in a single line as a functional method?
In other words I'd like to replace this:
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
EXPORTING
input = lv_external_value
IMPORTING
output = lv_internal_value.
With:
lv_internal_value= zcl_conversion=>alpha_input( lv_external_value ).
Unfortunately the fact that Class Methods can't have an untyped returning parameter is preventing me from declaring the functional method's return value as type ANY or CLIKE. The accepted standard of creating generic method parameters seems to be to define them as TYPE REF TO DATA and dereference/assign them. But as far as I know that prevents me from calling the method in a single statement as I have to first assign the importing parameter and then dereference the returning parameter, resulting in the same or more lines of code than a simple FM call.
Is there a way around this?
Unfortunately, there is no other way to dereference data than to use the dereference operator, either in the form ->* for the full value segment, or in the form ->comp, if the data object is structured and has a component named comp (and, even worse, there are a lot of places in ABAP code where you would like to use a value from a derefenced data object but can't do it for internal reasons / syntax restrictions).
However, you could simply keep the data reference object retrieved by your method in a variable of the calling code and work with that variable (instead of using a field symbol or a variable for the derefenced value segment itself). Either generically, as a ref to data variable, or typed, using the CAST operator (new ABAP syntax).
Most things that can be done with a field-symbol, can also be done directly with a data reference as well.
Example: Working with a variable result of the expected return type:
data(result) = cast t000( cl=>m( ) ).
write result->mandt.
See here the full example:
report zz_new_syntax.
class cl definition.
public section.
class-methods m returning value(s) type ref to data.
endclass.
start-of-selection.
data(result) = cast t000( cl=>m( ) ).
write: / result->mandt. " Writes '123'.
class cl implementation.
method m.
s = new t000( mandt = '123' ).
endmethod.
endclass.
On ABAP NW Stack 7.4 you could just use parameters type STRING and then use the new CONV Operator to convert your actual input in string. Little ugly but should work.
lv_internal_value = CONV #(zcl_conversion=>alpha_input( CONV #(lv_external_value) )).
Is there a way I can get a attribute set in ServletContext in EL so that it ends up as a JavaScript variable?
I am setting it as
context.setAttribute("testing.port", "9000");
I tried retrieving it like
alert("port" +'${testing.port}');
I am just getting a blank.
The problem is the period (.) in the key name. EL interprets the period as a call to an accessor method named getPort1 on whatever object testing references. Fetch the value from the appropriate implicit object:
${applicationScope['testing.port']}
or just use a different key:
${testingPort}
1Yes, this is a simplification of what really happens. It may also look for a predicate getter named isPort, or try Map#get("port").
I'm trying to call a method within a class, assuming I only know its name (aka, a char vector with its name)
I tried calling str2func(['obj.' functionName]) - where functionName is the name of that method, without any luck - I can't seem to grab the handle of the method.
You can reference it like a field
obj.(functionName)
or using feval
feval(functionName, obj, ...)
I recommend the first option.
I came across some sample code in VB.Net which I have some experience with and kinda having a duh moment figuring out the meaning of :=.
RefreshNavigationImages(bForward:=True, startIndex:=-1)
The sig for this method is RefreshNavigationImages(boolean, int). Is this a default value if null? Like "bIsSomething ?? false"?
Tried to bing/google but they just don't like searching for operators especially if it's only 2 chars.
They are named parameters. They let you specify values for arguments in function calls by name rather than order.
The := indicates the use of named parameters. Rather than relying on the order of the parameters in the method declaration, named parameters allow you to specify the correlation of parameters to values by specifying the name of the parameter.