elct9620/mruby-go

package mruby

type CallinfoStack interface {
    Cursor() int
    Push(*callinfo)
    Pop() *callinfo
    Peek() *callinfo
}

type ContextStack interface {
    Get(int) Value
    Slice(int, int) []Value
    Set(int, Value)
}

type context struct {
    stack    ContextStack
    callinfo CallinfoStack
}

func (ctx *context) IsTop() bool {
    return ctx.callinfo.Cursor() == 0
}

func (ctx *context) GetCallinfo() *callinfo {
    return ctx.callinfo.Peek()
}

func (ctx *context) SetSequenceCursor(pc int) {
    ctx.GetCallinfo().SetSequnceCursor(pc)
}

func (ctx *context) Get(idx int) Value {
    offset := ctx.GetCallinfo().stackOffset
    return ctx.stack.Get(offset + idx)
}

func (ctx *context) Slice(start, end int) []Value {
    offset := ctx.GetCallinfo().stackOffset
    return ctx.stack.Slice(offset+start, offset+start+end)
}

func (ctx *context) Set(idx int, v Value) {
    offset := ctx.GetCallinfo().stackOffset
    ctx.stack.Set(offset+idx, v)
}