vise/go/vm/interpreter.go

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2023-04-03 09:22:01 +02:00
package vm
import (
"fmt"
)
type BatchCode uint16
const (
MENU_DOWN = 256
MENU_UP = 257
MENU_NEXT = 258
MENU_PREVIOUS = 259
)
var (
batchCode = map[string]BatchCode{
"DOWN": MENU_DOWN,
"UP": MENU_UP,
"NEXT": MENU_NEXT,
"PREVIOUS": MENU_PREVIOUS,
}
)
type menuItem struct {
code BatchCode
choice string
display string
target string
}
type MenuProcessor struct {
items []menuItem
size uint32
}
func NewMenuProcessor() MenuProcessor {
return MenuProcessor{}
}
func(mp *MenuProcessor) Add(bop string, choice string, display string, target string) error {
bopCode := batchCode[bop]
if bopCode == 0 {
return fmt.Errorf("unknown menu instruction: %v", bop)
}
m := menuItem{
code: bopCode,
choice: choice,
display: display,
target: target,
}
mp.items = append(mp.items, m)
return nil
}
func (mp *MenuProcessor) ToLines() []byte {
preLines := []byte{}
postLines := []byte{}
for _, v := range mp.items {
preLines = NewLine(preLines, MOUT, []string{v.choice, v.display}, nil, nil)
switch v.code {
case MENU_UP:
postLines = NewLine(postLines, INCMP, []string{v.choice, "_"}, nil, nil)
case MENU_NEXT:
_ = postLines
case MENU_PREVIOUS:
_ = postLines
default:
postLines = NewLine(postLines, INCMP, []string{v.choice, v.target}, nil, nil)
}
}
preLines = NewLine(preLines, HALT, nil, nil, nil)
return append(preLines, postLines...)
}