95 lines
2.5 KiB
Go
95 lines
2.5 KiB
Go
package asm
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import (
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"fmt"
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"git.defalsify.org/festive/vm"
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)
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// BatchCode defines quasi-opcodes that expand to mulitple individual vm instructions.
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type BatchCode uint16
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const (
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_MENU_OFFSET = 256
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MENU_DOWN = _MENU_OFFSET
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MENU_UP = _MENU_OFFSET + 1
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MENU_NEXT = _MENU_OFFSET + 2
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MENU_PREVIOUS = _MENU_OFFSET + 3
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)
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var (
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batchCode = map[string]BatchCode{
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"DOWN": MENU_DOWN,
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"UP": MENU_UP,
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"NEXT": MENU_NEXT,
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"PREVIOUS": MENU_PREVIOUS,
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}
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)
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type menuItem struct {
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code BatchCode
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choice string
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display string
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target string
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}
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// MenuProcessor handles code lines with BatchCode quasi-opcodes that control menu generation.
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//
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// It creates vm instructions for display of menu and handling of input on either size of a vm.HALT instruction.
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type MenuProcessor struct {
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items []menuItem
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size uint32
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}
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// NewMenuProcessor creates a new MenuProcessor object.
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func NewMenuProcessor() MenuProcessor {
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return MenuProcessor{}
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}
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// Add a menu batch instruction to be processed.
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//
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// Instructions will be rendered in the order in which they have been added.
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func(mp *MenuProcessor) Add(bop string, choice string, display string, target string) error {
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bopCode := batchCode[bop]
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if bopCode == 0 {
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return fmt.Errorf("unknown menu instruction: %v", bop)
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}
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if len(target) > 0 && bopCode != MENU_DOWN {
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return fmt.Errorf("target is only valid for DOWN")
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}
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m := menuItem{
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code: bopCode,
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choice: choice,
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display: display,
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target: target,
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}
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mp.items = append(mp.items, m)
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return nil
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}
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// ToLines returns the generated bytecode from the added menu batch instructions.
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func (mp *MenuProcessor) ToLines() []byte {
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preLines := []byte{}
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postLines := []byte{}
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for _, v := range mp.items {
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switch v.code {
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case MENU_UP:
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preLines = vm.NewLine(preLines, vm.MOUT, []string{v.choice, v.display}, nil, nil)
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postLines = vm.NewLine(postLines, vm.INCMP, []string{v.choice, "_"}, nil, nil)
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case MENU_NEXT:
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preLines = vm.NewLine(preLines, vm.MNEXT, []string{v.choice, v.display}, nil, nil)
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postLines = vm.NewLine(postLines, vm.INCMP, []string{v.choice, ">"}, nil, nil)
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case MENU_PREVIOUS:
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preLines = vm.NewLine(preLines, vm.MPREV, []string{v.choice, v.display}, nil, nil)
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postLines = vm.NewLine(postLines, vm.INCMP, []string{v.choice, "<"}, nil, nil)
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default:
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preLines = vm.NewLine(preLines, vm.MOUT, []string{v.choice, v.display}, nil, nil)
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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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}
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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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}
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