84 lines
2.5 KiB
Go
84 lines
2.5 KiB
Go
package termboxModules
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import "github.com/nsf/termbox-go"
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// Calculator An input field that allows simple maths
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type Calculator struct {
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text string
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input *InputField
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x, y, width, height int
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cursor int
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bg, fg termbox.Attribute
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history []string
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opStack []string
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showHistoryLines int
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}
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// CreateCalculator Create a calculator module
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func CreateCalculator(x, y, width, height int, fg, bg termbox.Attribute) *Calculator {
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i := Calculator{x: x, y: y, width: width, height: height, fg: fg, bg: bg, showHistoryLines: 0}
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i.input = CreateInputField(i.x, i.y, i.width, 2, i.fg, i.bg)
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i.input.bordered = true
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return &i
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}
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// PushOpStack Pushes a value onto the opStack
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func (calc *Calculator) PushOpStack(v string) {
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calc.opStack = append(calc.opStack, v)
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}
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// PopOpStack Pops the last value off of the opStack
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func (calc *Calculator) PopOpStack() string {
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prevEntry := opStack[len(opStack)-1]
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calc.opStack = opStack[:len(opStack)-1]
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return prevEntry
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}
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// HandleKeyPress Handle the termbox event, return true if it was consumed
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func (calc *Calculator) HandleKeyPress(event termbox.Event) bool {
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if event.Ch == '+' || event.Ch == '-' || event.Ch == '*' || event.Ch == '/' {
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// Save the value of input to opStack
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calc.PushOpStack(i.input.GetValue())
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calc.PushOpStack(string(event.Ch))
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i.input.SetValue("")
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return true
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} else if event.Ch == '=' {
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// Perform the operation
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var total int
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// Go ltr through stack doing all multiplication & division
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/*
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for len(opStack) > 0 {
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prevEntry := calc.PopStack()
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if prevEntry == "+" {
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prevEntry = calc.PopStack()
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if addVal, err := strconv.Atoi(prevEntry); err == nil {
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total = total + addVal
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}
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} else if prevEntry == "-" {
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prevEntry = calc.PopStack()
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if subVal, err := strconv.Atoi(prevEntry); err == nil {
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total = total - subVal
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}
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} else if prevEntry == "*" {
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prevEntry = calc.PopStack()
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if multVal, err := strconv.Atoi(prevEntry); err == nil {
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total = total * multVal
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}
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} else if prevEntry == "/" {
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prevEntry = calc.PopStack()
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if divVal, err := strconv.Atoi(prevEntry); err == nil {
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total = total / divVal
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}
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}
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}
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*/
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} else if event.Ch == '0' || event.Ch == '1' ||
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event.Ch == '2' || event.Ch == '3' ||
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event.Ch == '4' || event.Ch == '5' ||
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event.Ch == '6' || event.Ch == '7' ||
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event.Ch == '8' || event.Ch == '9' {
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return i.input.HandleKeyPress(event)
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}
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return false
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}
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