sbinet/go-eval

the beginning of an interpreter for Go (fork off exp/eval)

go-eval

This is the new home for the exp/eval package: the beginning of an interpreter for Go.

Installation

$ go get github.com/sbinet/go-eval/...

Usage

$ go-eval
:: welcome to go-eval...
(hit ^D to exit)
> hello := "world"
> println(hello)
world
>

Documentation

http://godoc.org/github.com/sbinet/go-eval

Limitations (aka TODO)

• channels are not implemented
• imports are not implemented
• goroutines are not implemented
• consts are not implemented
• select is not implemented

Interpreter

The go-eval command is rather barebone. But there is igo which is built on top of the eval package and provides some additional refinements.

See:

$ go get github.com/sbinet/igo

go-eval's Issues

const not implemented

Importing modules that define constants with "const" causes a panic:
panic: const not implemented

go version go1.0.3 on linux_amd64

go-eval version: commit 7de4c49

I am very excited to have a Go interpreter in which to try things out! (Contrary to some conversations on golang-nuts, I see the primary value of an interpreter as an interactive computing environment a la IPython.) I eagerly await future versions with more features.

import "math" caused panic

:) data $ go-eval
:: welcome to go-eval...
(hit ^D to exit)
> import "math"
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x8 pc=0x90f2e]

goroutine 1 [running]:
runtime.panic(0x1e9240, 0x4ba179)
    /usr/local/Cellar/go/1.2/libexec/src/pkg/runtime/panic.c:266 +0xb6
github.com/sbinet/go-eval/pkg/eval.(*blockCompiler).compileStmts(0x2107536c0, 0x0)
    /Users/zTrix/go/src/github.com/sbinet/go-eval/pkg/eval/stmt.go:1245 +0x1e
github.com/sbinet/go-eval/pkg/eval.(*compiler).compileFunc(0x210753540, 0x2107542c0, 0x210754380, 0x0, 0x0)
    /Users/zTrix/go/src/github.com/sbinet/go-eval/pkg/eval/stmt.go:1304 +0x4cf
github.com/sbinet/go-eval/pkg/eval.(*stmtCompiler).compileDecl(0x210753640, 0x58d6f8, 0x210662ed0)
    /Users/zTrix/go/src/github.com/sbinet/go-eval/pkg/eval/stmt.go:428 +0x3d2
github.com/sbinet/go-eval/pkg/eval.(*stmtCompiler).compileDeclStmt(0x210753640, 0x2106fa410)
    /Users/zTrix/go/src/github.com/sbinet/go-eval/pkg/eval/stmt.go:351 +0x17f
github.com/sbinet/go-eval/pkg/eval.(*stmtCompiler).compile(0x210753640, 0x58da28, 0x2106fa410)
    /Users/zTrix/go/src/github.com/sbinet/go-eval/pkg/eval/stmt.go:263 +0x758
github.com/sbinet/go-eval/pkg/eval.(*blockCompiler).compileStmt(0x2107535a0, 0x58da28, 0x2106fa410)
    /Users/zTrix/go/src/github.com/sbinet/go-eval/pkg/eval/stmt.go:1241 +0x7e
github.com/sbinet/go-eval/pkg/eval.(*World).CompileStmtList(0x21061c240, 0x210601880, 0x21074f8c0, 0x5, 0x5, ...)
    /Users/zTrix/go/src/github.com/sbinet/go-eval/pkg/eval/world.go:183 +0x374
github.com/sbinet/go-eval/pkg/eval.(*World).CompileDeclList(0x21061c240, 0x210601880, 0x21074f870, 0x5, 0x5, ...)
    /Users/zTrix/go/src/github.com/sbinet/go-eval/pkg/eval/world.go:198 +0x189
github.com/sbinet/go-eval/pkg/eval.(*World).CompilePackage(0x21061c240, 0x210601880, 0x2106b57b8, 0x1, 0x1, ...)
    /Users/zTrix/go/src/github.com/sbinet/go-eval/pkg/eval/world.go:132 +0xa75
github.com/sbinet/go-eval/pkg/eval.(*World).CompilePackage(0x21061c240, 0x210601880, 0x210740200, 0x2a, 0x40, ...)
    /Users/zTrix/go/src/github.com/sbinet/go-eval/pkg/eval/world.go:104 +0xf81
github.com/sbinet/go-eval/pkg/eval.(*World).compileImport(0x21061c240, 0x210601880, 0x2105c6b10, 0xd, 0x2, ...)
    /Users/zTrix/go/src/github.com/sbinet/go-eval/pkg/eval/world.go:314 +0x354
github.com/sbinet/go-eval/pkg/eval.(*World).Compile(0x21061c240, 0x210601880, 0x2105c6b10, 0xd, 0x0, ...)
    /Users/zTrix/go/src/github.com/sbinet/go-eval/pkg/eval/world.go:281 +0x12b
main.main()
    /Users/zTrix/go/src/github.com/sbinet/go-eval/cmd/go-eval/eval.go:95 +0xb33

Bump!

Hey,... it'd be so great to have a Go interpreter! Embedded in Go, ..

It'd be like that: https://www.youtube.com/watch?v=9CS7j5I6aOc

So, anyone working on this ?

Still active?

Hello,

is there activity on go-eval or on the new SSA interpreter https://github.com/go-interpreter/ssainterp ?
They both they seem nice but work-in-progress, i.e. many features are not yet implemented.

I wrote my own Go interpreter https://github.com/cosmos72/gomacro before learning about these, and it's now fairly complete, so I have mixed feelings about the duplication... on one side it shows me there are other people interested in a Go interpreter, and a possibility for cooperation, on the other it could be constructed as "yet another reimplementation"

Best regards,

cosmos72

go get failed

go get github.com/sbinet/go-eval/cmd/go-eval

github.com/sbinet/go-eval/cmd/go-eval

e:\dev\golang\dev\src\github.com\sbinet\go-eval\cmd\go-eval\eval.go:80: undefined: terminal.MakeRaw
e:\dev\golang\dev\src\github.com\sbinet\go-eval\cmd\go-eval\eval.go:84: undefined: terminal.Restore

Import doesn't work

$ go-eval
:: welcome to go-eval...
> import "os"
undeclared name: sameFile
> import "fmt"
undeclared name: buffer (and 5 more errors)
> 

This is only a "go run" of authority

This is only a "go run" of authority simply，why a project for that?

calling a native go function

Hi Sebastian,
How hard would it be to call native go functions via reflection from go-eval?
Thanks!
Jason

fake variable definitions

the following two lines (with no other context) will crash go-eval.

> a := b
> a

support for chan

go-eval doesn't have any support for channels.

when to complete imports can i run it likes python eval,How to import functions, how to interact with the code outside the string,How to use the REPL mode in the Golang language

when to complete imports can i run it likes python eval Inside the code,Is there a code example?How to import functions, how to interact with the code outside the string

function with error still cause re-declaration

Here is my testing code

func foo() { return 1 }
func foo() int { return 1 }

First line will cause error of:

input:1:24: too many values for return
<none>
ideal integer

and then the next line will cause re-declaration of identifier foo
I think the identifier foo should be removed if the declaration failed?