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// Copyright 2013 Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package getopt
import (
"fmt"
"strconv"
)
type signed int64
type SignedLimit struct {
Base int // Base for conversion as per strconv.ParseInt
Bits int // Number of bits as per strconv.ParseInt
Min int64 // Minimum allowed value if both Min and Max are not 0
Max int64 // Maximum allowed value if both Min and Max are not 0
}
var signedLimits = make(map[*signed]*SignedLimit)
func (n *signed) Set(value string, opt Option) error {
l := signedLimits[n]
if l == nil {
return fmt.Errorf("no limits defined for %s", opt.Name())
}
v, err := strconv.ParseInt(value, l.Base, l.Bits)
if err != nil {
if e, ok := err.(*strconv.NumError); ok {
switch e.Err {
case strconv.ErrRange:
err = fmt.Errorf("value out of range: %s", value)
case strconv.ErrSyntax:
err = fmt.Errorf("not a valid number: %s", value)
}
}
return err
}
if l.Min != 0 || l.Max != 0 {
if v < l.Min {
return fmt.Errorf("value out of range (<%v): %s", l.Min, value)
}
if v > l.Max {
return fmt.Errorf("value out of range (>%v): %s", l.Max, value)
}
}
*n = signed(v)
return nil
}
func (n *signed) String() string {
l := signedLimits[n]
if l != nil && l.Base != 0 {
return strconv.FormatInt(int64(*n), l.Base)
}
return strconv.FormatInt(int64(*n), 10)
}
// Signed creates an option that is stored in an int64 and is constrained
// by the limits pointed to by l. The Max and Min values are only used if
// at least one of the values are not 0. If Base is 0, the base is implied by
// the string's prefix: base 16 for "0x", base 8 for "0", and base 10 otherwise.
func Signed(name rune, value int64, l *SignedLimit, helpvalue ...string) *int64 {
return CommandLine.Signed(name, value, l, helpvalue...)
}
func (s *Set) Signed(name rune, value int64, l *SignedLimit, helpvalue ...string) *int64 {
return s.SignedLong("", name, value, l, helpvalue...)
}
func SignedLong(name string, short rune, value int64, l *SignedLimit, helpvalue ...string) *int64 {
return CommandLine.SignedLong(name, short, value, l, helpvalue...)
}
func (s *Set) SignedLong(name string, short rune, value int64, l *SignedLimit, helpvalue ...string) *int64 {
s.SignedVarLong(&value, name, short, l, helpvalue...)
return &value
}
func SignedVar(p *int64, name rune, l *SignedLimit, helpvalue ...string) Option {
return CommandLine.SignedVar(p, name, l, helpvalue...)
}
func (s *Set) SignedVar(p *int64, name rune, l *SignedLimit, helpvalue ...string) Option {
return s.SignedVarLong(p, "", name, l, helpvalue...)
}
func SignedVarLong(p *int64, name string, short rune, l *SignedLimit, helpvalue ...string) Option {
return CommandLine.SignedVarLong(p, name, short, l, helpvalue...)
}
func (s *Set) SignedVarLong(p *int64, name string, short rune, l *SignedLimit, helpvalue ...string) Option {
opt := s.VarLong((*signed)(p), name, short, helpvalue...)
if l.Base > 36 || l.Base == 1 || l.Base < 0 {
fmt.Fprintf(stderr, "invalid base for %s: %d\n", opt.Name(), l.Base)
exit(1)
}
if l.Bits < 0 || l.Bits > 64 {
fmt.Fprintf(stderr, "invalid bit size for %s: %d\n", opt.Name(), l.Bits)
exit(1)
}
if l.Min > l.Max {
fmt.Fprintf(stderr, "min greater than max for %s\n", opt.Name())
exit(1)
}
lim := *l
signedLimits[(*signed)(p)] = &lim
return opt
}
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