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A Wrap represents the wrapper which allows objects created by the interpreter to satify Go interfaces (despite limitations in reflect which forbid dynamic method creation). All the struct fields are functions, where the fied name corresponds to the method name prefixed by "Do". The function signature must be the same as the interface one. A corresponding Wrap method Xyz which satisfies the interface must exist and must invoke the DoXyz function. To be usable, the interpreter should return a Wrap instance with the relevant function fields filled. The application can then invoke methods on it. The method calls will be forwarded to the interpreter. Only the Wrap type definition needs to be exported to the interpreter (not the interfaces and methods definitions) A complete working example test is provided, and necessary corrections in binary struct fields as functions.
Go interpreter
A Go interpreter in go
Tests
Tests are simple standalone go programs to be run by gi executable.
Scripts are converted to go test examples for execution by go test as well.
To create a new test, simply add a new .gi file, specifying expected output at end of program in a // Output: comment block like in the following example:
package main
func main() {
println("Hello")
}
// Output:
// Hello
Then in _test/, run make to re-generate interp/eval_test.go
When developing/debugging, I'm running gi on a single script, using -a and -c options to display AST and CFG graphs, and instrumenting code with temporary println statements to diagnose problems.