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Compiler error on in-line template as parameter of a function [message #1859307]

Tue, 30 May 2023 10:39

Yann Garcia

Messages: 145
Registered: June 2016

Senior Member

Dear Support,

I got a compiler error (see below) when passing an inline template declaration as an argument of TTCN-3 function:

f_Iot_Diameter_receive(
                    {
                        DIAMETER_MSG:{uDR_MSG := mw_UDR_userData_publicIdentity("tel:"&v_userInfoA.publicId)}
                    },
                    {},
                    {0, omit},
                    "TP_SH_HSS_UDA_01 - UDR",
                    p_forward_to_mtc,
                    p_checkMessage 
                )

The inline template declaration is:

DIAMETER_MSG:{uDR_MSG := mw_UDR_userData_publicIdentity("tel:"&v_userInfoA.publicId)}

The compiler error is:
./ttcn/AtsImsIot/AtsImsIot_TP_behavior_SH.ttcn:90:37: error: at or before token `:': syntax error, unexpected ':', expecting ',' or '}'
Notify: Parsing TTCN-3 module `./ttcn/AtsImsIot/AtsImsIot_TD_DRG.ttcn'...

My understanding of ETSI ES 201 873-1 clause 15.4 In-line Templates is that inline template usage is not limited to port operation such a send or receive.
Is it correct?

Many thanks in advance for your help,

BR\Yann Garia

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Re: Compiler error on in-line template as parameter of a function [message #1859313 is a reply to message #1859307]

Tue, 30 May 2023 15:56

Yann Garcia

Messages: 145
Registered: June 2016

Senior Member

Hello,

Just an additional note: DIAMETER_MSG an union of all DIAMETER messages (see https://forge.etsi.org/rep/LIBS/LibDiameter/-/blob/TTF006/ttcn/LibDiameter_TypesAndValues.ttcn]).
So this is a huge union and it won't be easy to create a template for each variant of this union. This is why we are using inline template.

Thanks,

BR\Yann Garcia

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Re: Compiler error on in-line template as parameter of a function [message #1859337 is a reply to message #1859313]

Wed, 31 May 2023 16:05

Botond Baranyi

Messages: 55
Registered: February 2016

Member

Hi Yann,

there is pair of curly brackets around the mentioned in-line template, meaning it is supposed to be a field of a record or an element in an array.

In-line templates work for function parameters in TITAN, but only if the entire actual parameter is an in-line template (i.e. the type indicator is in front of the whole actual parameter, not in front of a field or element).

You could write this instead (without the curly brackets), or replace DIAMETER_MSG with the parent structure, if it really is a field or element:

f_Iot_Diameter_receive(
                    DIAMETER_MSG:{uDR_MSG := mw_UDR_userData_publicIdentity("tel:"&v_userInfoA.publicId)},
                    {},
                    {0, omit},
                    "TP_SH_HSS_UDA_01 - UDR",
                    p_forward_to_mtc,
                    p_checkMessage 
                )

Best regards,
Botond Baranyi

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Re: Compiler error on in-line template as parameter of a function [message #1859338 is a reply to message #1859337]

Wed, 31 May 2023 16:12

Botond Baranyi

Messages: 55
Registered: February 2016

Member

Also, the type of a function parameter is unambiguous. I'm not sure what the point of using a type identifier before the template would be, the compiler already knows what type to expect for that parameter.

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Re: Compiler error on in-line template as parameter of a function [message #1859344 is a reply to message #1859338]

Thu, 01 June 2023 10:32

Yann Garcia

Messages: 145
Registered: June 2016

Senior Member

Hello Botond,

Thanks a lot for your feedback.
One clarification: the code below cannot compile if I properly understood what you explained:

var template DIAMETER_MSG mw_diameter_msg := DIAMETER_MSG:{mAR_MSG := mw_MAR(mw_publicIdentity(v_publicIdentity))};

Am I right?

Many thanks,

BR\Yann Garcia

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Re: Compiler error on in-line template as parameter of a function [message #1859347 is a reply to message #1859344]

Thu, 01 June 2023 14:48

Botond Baranyi

Messages: 55
Registered: February 2016

Member

Hello Yann,

yes, it doesn't compile.

Best regards,
Botond Baranyi

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Re: Compiler error on in-line template as parameter of a function [message #1859350 is a reply to message #1859347]

Thu, 01 June 2023 15:22

Yann Garcia

Messages: 145
Registered: June 2016

Senior Member

Yes,
this is what I thought.

We are evaluating who to move all ETSI INT Test Suites (conformance and Interoperability tests for IMS, DIAMETER, SIP...) to TITAN.
Do you think it can be implemented in TITAN for the future?

Many thanks,

BR\Yann

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Re: Compiler error on in-line template as parameter of a function [message #1859369 is a reply to message #1859350]

Fri, 02 June 2023 15:23

Botond Baranyi

Messages: 55
Registered: February 2016

Member

Hello Yann,

I don't think it'll be implemented anytime soon.

As a workaround you can simply omit the type indicator before these templates (that is, use regular templates instead of in-line templates).

Such as:

var template DIAMETER_MSG mw_diameter_msg := {mAR_MSG := mw_MAR(mw_publicIdentity(v_publicIdentity))};

Or:

f_Iot_Diameter_receive(
                    {
                        {uDR_MSG := mw_UDR_userData_publicIdentity("tel:"&v_userInfoA.publicId)}
                    },
                    {},
                    {0, omit},
                    "TP_SH_HSS_UDA_01 - UDR",
                    p_forward_to_mtc,
                    p_checkMessage 
                )

The type of a variable or a function parameter is not ambiguous, so there's no reason to specify its type again on the right-hand-side, or in the actual parameter value.

Best regards,
Botond Baranyi

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