PKGBUILD/vendor/periph.io/x/periph/conn/pin/func.go

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2018-12-04 18:11:50 +00:00
// Copyright 2018 The Periph Authors. All rights reserved.
// Use of this source code is governed under the Apache License, Version 2.0
// that can be found in the LICENSE file.
package pin
import (
"strconv"
"strings"
)
// Func is a pin function.
//
// The Func format must be "[A-Z]+", "[A-Z]+_[A-Z]+" or exceptionally
// "(In|Out)/(Low|High)".
type Func string
// FuncNone is returned by PinFunc.Func() for a Pin without an active
// functionality.
const FuncNone Func = ""
// Specialize converts a "BUS_LINE" function and appends the bug number and
// line number, to look like "BUS0_LINE1".
//
// Use -1 to not add a bus or line number.
func (f Func) Specialize(b, l int) Func {
if f == FuncNone {
return FuncNone
}
if b != -1 {
parts := strings.SplitN(string(f), "_", 2)
if len(parts) == 1 {
return FuncNone
}
f = Func(parts[0] + strconv.Itoa(b) + "_" + parts[1])
}
if l != -1 {
f += Func(strconv.Itoa(l))
}
return f
}
// Generalize is the reverse of Specialize().
func (f Func) Generalize() Func {
parts := strings.SplitN(string(f), "_", 2)
f = Func(strings.TrimRightFunc(parts[0], isNum))
if len(parts) == 2 {
f += "_"
f += Func(strings.TrimRightFunc(parts[1], isNum))
}
return f
}
//
func isNum(r rune) bool {
return r >= '0' && r <= '9'
}