Function compile

codelab/solution/codelab.go:388–399

Functions to assist with CEL execution. compile will parse and check an expression `expr` against a given environment `env` and determine whether the resulting type of the expression matches the `exprType` provided as input.

(env *cel.Env, expr string, celType *cel.Type)

// environment `env` and determine whether the resulting type of the expression
// matches the `exprType` provided as input.
func compile(env *cel.Env, expr string, celType *cel.Type) *cel.Ast {
	ast, iss := env.Compile(expr)
	if iss.Err() != nil {
		glog.Exit(iss.Err())
	}
	if !reflect.DeepEqual(ast.OutputType(), celType) {
		glog.Exitf(
			"Got %v, wanted %v result type", ast.OutputType(), celType)
	}
	fmt.Printf("%s\n\n", strings.ReplaceAll(expr, "\t", " "))
	return ast
}

// eval will evaluate a given program `prg` against a set of variables `vars`
// and return the output, eval details (optional), or error that results from