how to parse kotlin code?

Question

I need to analyse kotlin files code, to detect the keyword "data" and "?".

The issue is I don't find any libs like JavaParser. I don't need powerfull tools, just something who return me the number of the lines.

Any idea?

Showdown

Every Tool/IDE has a "find in path" function. Or is this something that needs to be generated automatically? – Nutcracker

@thomas-kleßen What do you mean? I'm developping a code analyse plugin, I need something more powerfull than a simple character search. Please tell-me than you're not the one who low-vote me ! – Showdown

No. It wasn't me. I just asked what usecase you have in mind. – Nutcracker

I have a project that wraps the official Kotlin parser at github.com/cretz/kastree – Hubris

Answer 1

I use antlr4 to do it. And I create an open source lib: https://github.com/sarahBuisson/kotlin-parser

<dependency
   <groupId>com.github.sarahbuisson</groupId>
   <artifactId>kotlin-parser</artifactId>
</dependency>

Showdown

Answer 2

Besides the tools mentioned in other answers, here is another one someone may find useful:

https://github.com/kotlinx/ast

Conduit

Answer 3

You would need to either find a Kotlin parser, or write your own.

For this subset of parsing you may be able to cheat, as data is a keyword, so if you see data with non letters each side you know it is the keyword.

For ?, it depends which meaning you want, the elvis one can be detected by the dot else try the nullable meaning if the ? is next to a letter.

Patinous

Except if it's in a string. Both seems pretty common in English. – Amboina

Answer 4

You can try Kastree -- simple library to manipulate Kotlin source code as a set of AST objects.

https://github.com/cretz/kastree

Mosstrooper

Answer 5

See this [0] Kotlin code parsing related discussion. They talk about using antlr v4 grammar to parse the Kotlin code.

[0] https://discuss.kotlinlang.org/t/kotlin-parser/1728

Hereditary

Yep, I use a similar stuff to developp a lib who do it: github.com/sarahBuisson/kotlin-parser – Showdown

Answer 6

I have not yet written a Kotlin language grammar for it.

But I have implemented a parser in Kotlin, id that is any use.

It is Kotlin common code, so should work for any target platform.

There is an article about it here, and the code is on github.

https://medium.com/@dr.david.h.akehurst/agl-your-dsl-in-the-web-c9f54595691b

Masculine