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JSON key name with dash (-) [message #1859515]

Tue, 13 June 2023 08:13

Lars Udd

Messages: 2
Registered: June 2023

Junior Member

I want to use the JSON encoder/decoder to simulate a rest API which uses JSON.
Some of the objects have keys that use a dash in the name.

For example, in ttcn I call it userData but in JSON it should be user-data.
So I tried:
variant(userData) "JSON: name as user-data";

But the compiler says:
error: in variant attribute, at or before token `-': invalid JSON token

Also tried with single quotes around user-data, but the it says that the single quote is
invalid token.

How can we work around this? We use Titan 8.3.0.

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Re: JSON key name with dash (-) [message #1859523 is a reply to message #1859515]

Tue, 13 June 2023 15:44

Olaf Bergengruen

Messages: 127
Registered: November 2018

Senior Member

Did you try:

variant(userData) "JSON:name as 'user-data'";

using single quotes?

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Re: JSON key name with dash (-) [message #1859524 is a reply to message #1859523]

Tue, 13 June 2023 15:49

Olaf Bergengruen

Messages: 127
Registered: November 2018

Senior Member

Oops, sorry, you write that you already tried my proposal (also removed the blank after the colon ?)

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Re: JSON key name with dash (-) [message #1859525 is a reply to message #1859515]

Tue, 13 June 2023 16:19

Gábor Szalai

Messages: 134
Registered: December 2015

Senior Member

Use the standard format of the attribute without JSON:

variant(userData) "name as 'user-data'";

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Re: JSON key name with dash (-) [message #1859526 is a reply to message #1859524]

Tue, 13 June 2023 16:21

Adam Knapp

Messages: 54
Registered: November 2020

Member

Hi,
Currently, the supported syntax of the alias is the same as the syntax of an identifier in TITAN (regex: [A-Za-z][A-Za-z0-9_]*). So, the dash character is not allowed.
We will check whether we can extend this current set.

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Re: JSON key name with dash (-) [message #1859527 is a reply to message #1859526]

Tue, 13 June 2023 16:57

Gábor Szalai

Messages: 134
Registered: December 2015

Senior Member

The TITAN has two kind of "name as" attribute:
"JSON: name as identifier"
"name as 'freetext'"

The JSON encoder of the TITAN was developed before the standardization of the JSON usage in TTCN, so the attributes prefixed with "JSON:" are the old attributes. Later on the standard attributes were added to the TITAN.
The old "JSON: name as identifier" supports only identifiers, but the standardised format "name as 'freetext'" supports any kind of freetext like:

variant(type_) "name as 't  !@# 5^ --  ype'"

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Re: JSON key name with dash (-) [message #1859546 is a reply to message #1859527]

Wed, 14 June 2023 10:46

Lars Udd

Messages: 2
Registered: June 2023

Junior Member

Thanks for quick reply! Standard version works fine.

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