using inline vars in expressions

[Mohit Nagpal]

trying to use inline vars in expressions. 

code to declare inline vars does not compile

// var glossList: 'payload.glossary.GlossDiv.GlossList'

// expression : glossList.GlossEntry.ID == 'SGML'

ast, iss := env.Compile("payload.glossary.GlossDiv.GlossList")

if iss.Err() != nil {

fmt.Printf("env.Compile(%s) failed: %s", "variable", iss.Err())

}

cel.NewInlineVariable("glossList", ast) // does not compile.

full code

playground link https://go.dev/play/p/YgxDTtUtRQK   

[Tristan Swadell]

Hi Mohit,

You will need to setup an InliningOptimizer for the inlining to work:

inlineAST, iss := env.Compile("payload.glossary.GlossDiv.GlossList")
inlinedVars = append(inlinedVars, cel.NewInlineVariable("glossList", inlineAST))

exprAST, iss := env.Compile("glossList.Glossary.ID == 'SGML')
opt := cel.NewStaticOptimizer(cel.NewInliningOptimizer(inlinedVars...))
optimized, iss := opt.Optimize(env, exprAST)

-Tristan

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[Mohit Nagpal]

cel.NewInlineVariable does not compile. is there any goplayground link for sample to run expression end to end with inline vars and optimizer.

[Tristan Swadell]

Hi Mohit,

You are welcome to look at the structure of the `cel/inlining_test.go` which should give you a couple of examples of the inlining setup and execution. I don't typically put together go playground examples for CEL since they usually timeout and end up not being that useful.

The key thing to remember is that you need to declare the `payload` variable in the first `cel.Env` instance, and the `glossList` variable in the second `cel.Env` instance. Only after both expression compile can one be inlined into the other.

Regards,

-Tristan

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