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platform_flag.go
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platform_flag.go
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package main
import (
"flag"
"fmt"
"strings"
)
// PlatformFlag is a flag.Value (and flag.Getter) implementation that
// is used to track the os/arch flags on the command-line.
type PlatformFlag struct {
OS []string
Arch []string
OSArch []Platform
}
// Platforms returns the list of platforms that were set by this flag.
// The default set of platforms must be passed in.
func (p *PlatformFlag) Platforms(supported []Platform) []Platform {
// NOTE: Reading this method alone is a bit hard to understand. It
// is much easier to understand this method if you pair this with the
// table of test cases it has.
// Build a list of OS and archs NOT to build
ignoreArch := make(map[string]struct{})
includeArch := make(map[string]struct{})
ignoreOS := make(map[string]struct{})
includeOS := make(map[string]struct{})
ignoreOSArch := make(map[string]Platform)
includeOSArch := make(map[string]Platform)
for _, v := range p.Arch {
if v[0] == '!' {
ignoreArch[v[1:]] = struct{}{}
} else {
includeArch[v] = struct{}{}
}
}
for _, v := range p.OS {
if v[0] == '!' {
ignoreOS[v[1:]] = struct{}{}
} else {
includeOS[v] = struct{}{}
}
}
for _, v := range p.OSArch {
if v.OS[0] == '!' {
v = Platform{
OS: v.OS[1:],
Arch: v.Arch,
}
ignoreOSArch[v.String()] = v
} else {
includeOSArch[v.String()] = v
}
}
// We're building a list of new platforms, so build the list
// based only on the configured OS/arch pairs.
var prefilter []Platform = nil
if len(includeOSArch) > 0 {
prefilter = make([]Platform, 0, len(p.Arch)*len(p.OS)+len(includeOSArch))
for _, v := range includeOSArch {
prefilter = append(prefilter, v)
}
}
if len(includeOS) > 0 && len(includeArch) > 0 {
// Build up the list of prefiltered by what is specified
if prefilter == nil {
prefilter = make([]Platform, 0, len(p.Arch)*len(p.OS))
}
for _, os := range p.OS {
if _, ok := includeOS[os]; !ok {
continue
}
for _, arch := range p.Arch {
if _, ok := includeArch[arch]; !ok {
continue
}
prefilter = append(prefilter, Platform{
OS: os,
Arch: arch,
})
}
}
} else if len(includeOS) > 0 {
// Build up the list of prefiltered by what is specified
if prefilter == nil {
prefilter = make([]Platform, 0, len(p.Arch)*len(p.OS))
}
for _, os := range p.OS {
for _, platform := range supported {
if platform.OS == os {
prefilter = append(prefilter, platform)
}
}
}
}
if prefilter != nil {
// Remove any that aren't supported
result := make([]Platform, 0, len(prefilter))
for _, pending := range prefilter {
found := false
for _, platform := range supported {
if pending.String() == platform.String() {
found = true
break
}
}
if found {
add := pending
add.Default = false
result = append(result, add)
}
}
prefilter = result
}
if prefilter == nil {
prefilter = make([]Platform, 0, len(supported))
for _, v := range supported {
if v.Default {
add := v
add.Default = false
prefilter = append(prefilter, add)
}
}
}
// Go through each default platform and filter out the bad ones
result := make([]Platform, 0, len(prefilter))
for _, platform := range prefilter {
if len(ignoreOSArch) > 0 {
if _, ok := ignoreOSArch[platform.String()]; ok {
continue
}
}
// We only want to check the components (OS and Arch) if we didn't
// specifically ask to include it via the osarch.
checkComponents := true
if len(includeOSArch) > 0 {
if _, ok := includeOSArch[platform.String()]; ok {
checkComponents = false
}
}
if checkComponents {
if len(ignoreArch) > 0 {
if _, ok := ignoreArch[platform.Arch]; ok {
continue
}
}
if len(ignoreOS) > 0 {
if _, ok := ignoreOS[platform.OS]; ok {
continue
}
}
if len(includeArch) > 0 {
if _, ok := includeArch[platform.Arch]; !ok {
continue
}
}
if len(includeOS) > 0 {
if _, ok := includeOS[platform.OS]; !ok {
continue
}
}
}
result = append(result, platform)
}
return result
}
// ArchFlagValue returns a flag.Value that can be used with the flag
// package to collect the arches for the flag.
func (p *PlatformFlag) ArchFlagValue() flag.Value {
return (*appendStringValue)(&p.Arch)
}
// OSFlagValue returns a flag.Value that can be used with the flag
// package to collect the operating systems for the flag.
func (p *PlatformFlag) OSFlagValue() flag.Value {
return (*appendStringValue)(&p.OS)
}
// OSArchFlagValue returns a flag.Value that can be used with the flag
// package to collect complete os and arch pairs for the flag.
func (p *PlatformFlag) OSArchFlagValue() flag.Value {
return (*appendPlatformValue)(&p.OSArch)
}
// appendPlatformValue is a flag.Value that appends a full platform (os/arch)
// to a list where the values from space-separated lines. This is used to
// satisfy the -osarch flag.
type appendPlatformValue []Platform
func (s *appendPlatformValue) String() string {
return ""
}
func (s *appendPlatformValue) Set(value string) error {
if value == "" {
return nil
}
for _, v := range strings.Split(value, " ") {
parts := strings.Split(v, "/")
if len(parts) != 2 {
return fmt.Errorf(
"Invalid platform syntax: %s should be os/arch", v)
}
platform := Platform{
OS: strings.ToLower(parts[0]),
Arch: strings.ToLower(parts[1]),
}
s.appendIfMissing(&platform)
}
return nil
}
func (s *appendPlatformValue) appendIfMissing(value *Platform) {
for _, existing := range *s {
if existing == *value {
return
}
}
*s = append(*s, *value)
}
// appendStringValue is a flag.Value that appends values to the list,
// where the values come from space-separated lines. This is used to
// satisfy the -os="windows linux" flag to become []string{"windows", "linux"}
type appendStringValue []string
func (s *appendStringValue) String() string {
return strings.Join(*s, " ")
}
func (s *appendStringValue) Set(value string) error {
for _, v := range strings.Split(value, " ") {
if v != "" {
s.appendIfMissing(strings.ToLower(v))
}
}
return nil
}
func (s *appendStringValue) appendIfMissing(value string) {
for _, existing := range *s {
if existing == value {
return
}
}
*s = append(*s, value)
}