The example with go yacc doesn't work

[nickydonna]

I was having trouble using nex with go yacc so I copied the example to test it out. I compiled, but it didn't work, as soon as I enter some text it breaks

Using: Mac OS 10.10.1 Go version go1.3.3 darwin/amd64

panic: syntax error

goroutine 16 [running]:
runtime.panic(0xa6300, 0x2081aa300)
    /usr/local/Cellar/go/1.3.3/libexec/src/pkg/runtime/panic.c:279 +0xf5
main.Lexer.Error(0x2081ae0c0, 0x2081cc240, 0x1, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0xe67f0, ...)
    /Users/donnanicolas/go/src/tu-carrito.com/backend/extractor/rp/rp.nn.go:239 +0x67
main.(*Lexer).Error(0x2081c21e0, 0xe67f0, 0xc)
    <autogenerated>:3 +0xa5
main.yyParse(0x22081bc340, 0x2081c21e0, 0x170bc8)
    /Users/donnanicolas/go/src/tu-carrito.com/backend/extractor/rp/yaccpar:155 +0x563
main.main()
    /Users/donnanicolas/go/src/tu-carrito.com/backend/extractor/rp/rp.nn.go:263 +0x84

goroutine 19 [finalizer wait]:
runtime.park(0x17f90, 0x170b90, 0x16ff09)
    /usr/local/Cellar/go/1.3.3/libexec/src/pkg/runtime/proc.c:1369 +0x89
runtime.parkunlock(0x170b90, 0x16ff09)
    /usr/local/Cellar/go/1.3.3/libexec/src/pkg/runtime/proc.c:1385 +0x3b
runfinq()
    /usr/local/Cellar/go/1.3.3/libexec/src/pkg/runtime/mgc0.c:2644 +0xcf
runtime.goexit()
    /usr/local/Cellar/go/1.3.3/libexec/src/pkg/runtime/proc.c:1445

goroutine 20 [chan send]:
main.func·003(0x2081ae120, 0x2081ae0c0, 0x2081ea000, 0x3, 0x3, 0x0, 0x1)
    /Users/donnanicolas/go/src/tu-carrito.com/backend/extractor/rp/rp.nn.go:136 +0x9c8
created by main.NewLexerWithInit
    /Users/donnanicolas/go/src/tu-carrito.com/backend/extractor/rp/rp.nn.go:193 +0x677

[drewwells]

I seem to be having a similar issue that when returning types from actions, EOF always panics. @blynn Can you add more examples of returning types from actions? For instance, this example

%%
"+"    { return ADD; }
%%

[blynn]

I wrote nex way back in the Go 1.0 days, and looks like a lot has changed since then. I rarely use Go or yacc-like tools these days, so I'm afraid I don't know when I'll get around to fixing this.

[purpleidea]

@drewwells I've got a bunch of examples in https://github.com/purpleidea/mgmt/tree/master/lang

If that's not enough LMK. I have a plan to write a blog post about this all too.