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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) (res any, err error) {
n := &parser.Node{}
if n.Child, err = i.Parse(src, n); err != nil {
return res, err
}
if debug {
n.Dot(os.Getenv("DOT"), "")
}
codeOffset := len(i.Code)
dataOffset := 0
if codeOffset > 0 {
// All data must be copied to the VM the first time only (re-entrance).
dataOffset = len(i.Data)
}
i.PopExit() // Remove last exit from previous run (re-entrance).
if err = i.CodeGen(n); err != nil {
return res, err
}
i.Push(i.Data[dataOffset:]...)
i.PushCode(i.Code[codeOffset:]...)
i.PushCode([]int64{0, vm1.Exit})
i.SetIP(max(codeOffset, i.Entry))
err = i.Run()
return i.Top(), err
}
func max(a, b int) int {
if a > b {
return a
}
return b
}
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