vise/go/asm/menu.go

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package asm
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import (
"fmt"
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"git.defalsify.org/festive/vm"
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)
type BatchCode uint16
const (
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_MENU_OFFSET = 256
MENU_DOWN = _MENU_OFFSET
MENU_UP = _MENU_OFFSET + 1
MENU_NEXT = _MENU_OFFSET + 2
MENU_PREVIOUS = _MENU_OFFSET + 3
//MENU_BROWSE = _MENU_OFFSET + 4
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)
var (
batchCode = map[string]BatchCode{
"DOWN": MENU_DOWN,
"UP": MENU_UP,
"NEXT": MENU_NEXT,
"PREVIOUS": MENU_PREVIOUS,
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//"BROWSE": MENU_BROWSE,
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}
)
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)
}
if len(target) > 0 && bopCode != MENU_DOWN {
return fmt.Errorf("target is only valid for DOWN")
}
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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 {
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preLines = vm.NewLine(preLines, vm.MOUT, []string{v.choice, v.display}, nil, nil)
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switch v.code {
case MENU_UP:
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postLines = vm.NewLine(postLines, vm.INCMP, []string{v.choice, "_"}, nil, nil)
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case MENU_NEXT:
_ = postLines
case MENU_PREVIOUS:
_ = postLines
default:
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postLines = vm.NewLine(postLines, vm.INCMP, []string{v.choice, v.target}, nil, nil)
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}
}
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preLines = vm.NewLine(preLines, vm.HALT, nil, nil, nil)
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return append(preLines, postLines...)
}
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