diff options
Diffstat (limited to 'interpreter/interpreter.go')
| -rw-r--r-- | interpreter/interpreter.go | 55 |
1 files changed, 0 insertions, 55 deletions
diff --git a/interpreter/interpreter.go b/interpreter/interpreter.go deleted file mode 100644 index 032a66f..0000000 --- a/interpreter/interpreter.go +++ /dev/null @@ -1,55 +0,0 @@ -// Package interpreter implements an interpreter. -package interpreter - -import ( - "reflect" - - "github.com/mvertes/parscan/compiler" - "github.com/mvertes/parscan/lang" - "github.com/mvertes/parscan/vm" -) - -const debug = true - -// Interp represents the state of an interpreter. -type Interp struct { - *compiler.Compiler - *vm.Machine -} - -// NewInterpreter returns a new interpreter. -func NewInterpreter(s *lang.Spec) *Interp { - return &Interp{compiler.NewCompiler(s), &vm.Machine{}} -} - -// Eval evaluates code string and return the last produced value if any, or an error. -func (i *Interp) Eval(src string) (res reflect.Value, err error) { - 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). - - t, err := i.Parse(src) - if err != nil { - return res, err - } - if err = i.Codegen(t); err != nil { - return res, err - } - i.Push(i.Data[dataOffset:]...) - i.PushCode(i.Code[codeOffset:]...) - if s, ok := i.Symbols["main"]; ok { - i.PushCode(vm.Instruction{Op: vm.Calli, Arg: []int{int(i.Data[s.Index].Data.Int())}}) - } - i.PushCode(vm.Instruction{Op: vm.Exit}) - i.SetIP(max(codeOffset, i.Entry)) - if debug { - i.PrintData() - i.PrintCode() - } - err = i.Run() - return i.Top().Data, err -} |
