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package codegen
import (
"os"
"github.com/gnolang/parscan/parser"
"github.com/gnolang/parscan/vm1"
)
const debug = true
type Interpreter struct {
*parser.Parser
*Compiler
*vm1.Machine
}
func NewInterpreter(p *parser.Parser) *Interpreter {
return &Interpreter{p, NewCompiler(), &vm1.Machine{}}
}
func (i *Interpreter) Eval(src string) (err error) {
n := &parser.Node{}
if n.Child, err = i.Parse(src); err != nil {
return err
}
if debug {
n.Dot(os.Getenv("DOT"), "")
}
offset := len(i.Code)
i.PopExit() // Remove last exit from previous run.
if err = i.CodeGen(n); err != nil {
return err
}
i.Push(i.Data...)
i.PushCode(i.Code[offset:]...)
i.PushCode([]int64{0, vm1.Exit})
i.SetIP(max(offset, i.Entry))
return i.Run()
}
func max(a, b int) int {
if a > b {
return a
}
return b
}
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