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Querying for classes based off Decorators#20942

Answeredbysmowton
Giardi77 asked this question inQ&A
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Hi everyone, I was testing a NestJS codebase which uses a lot of different decorators to implement some logic.

In particular, I wanted to build a query to get all classes with a@Controller decorator but without a@RequireRole decorator.

My attempt was to do something like this:

import javascriptfrom ClassDeclStmt cwhere c.getADecorator().toString().matches("%Controller%") and      not c.getADecorator().toString().matches("%RequireRole%")select c

But this is matching all classes with a@Controller decorator, even those that also have a@RequireRole decorator.

Any help would be really appreciated!

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Your code works for me for simple examples. Can you provide a code example that exhibits the problem?

One thing to watch out for:toString is abbreviated for AST nodes that would naturally consume more than 20 characters, so e.g.@RequireRole("Looooong") might turn into"@Requir ... ooong)". If that's the problem, you may need to usegetADecorator().getExpression().(InvokeExpr).getCalleeName() or similar (depending on the exact nature of the decorator) to extract the decorator's full function name.

Replies: 1 comment 1 reply

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Your code works for me for simple examples. Can you provide a code example that exhibits the problem?

One thing to watch out for:toString is abbreviated for AST nodes that would naturally consume more than 20 characters, so e.g.@RequireRole("Looooong") might turn into"@Requir ... ooong)". If that's the problem, you may need to usegetADecorator().getExpression().(InvokeExpr).getCalleeName() or similar (depending on the exact nature of the decorator) to extract the decorator's full function name.

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@Giardi77
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Hi@smowton, and thanks for the quick response!
Yes you are right and the problem was due to the fact that the decorator name got "truncated".
UsinggetADecorator().getExpression().(InvokeExpr).getCalleeName() i was able to match the correct classes.

Answer selected byGiardi77
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