trace.go

// Copyright Suneido Software Corp. All rights reserved.
// Governed by the MIT license found in the LICENSE file.

package builtin

import (
	. "github.com/apmckinlay/gsuneido/core"
	"github.com/apmckinlay/gsuneido/core/trace"
)

var _ = builtin(Trace, "(value, block = false)")

func Trace(th *Thread, args []Value) Value {
	if s, ok := args[0].ToStr(); ok {
		if args[1] != False {
			panic("usage: Trace(string) or Trace(flags, block)")
		}
		trace.Print(s + "\n")
	} else {
		prev := trace.Set(ToInt(args[0]))
		if args[1] != False {
			defer func() {
				trace.Set(prev)
			}()
			return th.Call(args[1])
		}
	}
	return nil
}