Initial commit

vendor/github.com/hyperhq/hypercli/opts/opts.go

@@ -0,0 +1,242 @@
+package opts
+
+import (
+	"fmt"
+	"net"
+	"regexp"
+	"strings"
+)
+
+var (
+	alphaRegexp  = regexp.MustCompile(`[a-zA-Z]`)
+	domainRegexp = regexp.MustCompile(`^(:?(:?[a-zA-Z0-9]|(:?[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9]))(:?\.(:?[a-zA-Z0-9]|(:?[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])))*)\.?\s*$`)
+)
+
+// ListOpts holds a list of values and a validation function.
+type ListOpts struct {
+	values    *[]string
+	validator ValidatorFctType
+}
+
+// NewListOpts creates a new ListOpts with the specified validator.
+func NewListOpts(validator ValidatorFctType) ListOpts {
+	var values []string
+	return *NewListOptsRef(&values, validator)
+}
+
+// NewListOptsRef creates a new ListOpts with the specified values and validator.
+func NewListOptsRef(values *[]string, validator ValidatorFctType) *ListOpts {
+	return &ListOpts{
+		values:    values,
+		validator: validator,
+	}
+}
+
+func (opts *ListOpts) String() string {
+	return fmt.Sprintf("%v", []string((*opts.values)))
+}
+
+// Set validates if needed the input value and add it to the
+// internal slice.
+func (opts *ListOpts) Set(value string) error {
+	if opts.validator != nil {
+		v, err := opts.validator(value)
+		if err != nil {
+			return err
+		}
+		value = v
+	}
+	(*opts.values) = append((*opts.values), value)
+	return nil
+}
+
+// Delete removes the specified element from the slice.
+func (opts *ListOpts) Delete(key string) {
+	for i, k := range *opts.values {
+		if k == key {
+			(*opts.values) = append((*opts.values)[:i], (*opts.values)[i+1:]...)
+			return
+		}
+	}
+}
+
+// GetMap returns the content of values in a map in order to avoid
+// duplicates.
+func (opts *ListOpts) GetMap() map[string]struct{} {
+	ret := make(map[string]struct{})
+	for _, k := range *opts.values {
+		ret[k] = struct{}{}
+	}
+	return ret
+}
+
+// GetAll returns the values of slice.
+func (opts *ListOpts) GetAll() []string {
+	return (*opts.values)
+}
+
+// GetAllOrEmpty returns the values of the slice
+// or an empty slice when there are no values.
+func (opts *ListOpts) GetAllOrEmpty() []string {
+	v := *opts.values
+	if v == nil {
+		return make([]string, 0)
+	}
+	return v
+}
+
+// Get checks the existence of the specified key.
+func (opts *ListOpts) Get(key string) bool {
+	for _, k := range *opts.values {
+		if k == key {
+			return true
+		}
+	}
+	return false
+}
+
+// Len returns the amount of element in the slice.
+func (opts *ListOpts) Len() int {
+	return len((*opts.values))
+}
+
+// NamedOption is an interface that list and map options
+// with names implement.
+type NamedOption interface {
+	Name() string
+}
+
+// NamedListOpts is a ListOpts with a configuration name.
+// This struct is useful to keep reference to the assigned
+// field name in the internal configuration struct.
+type NamedListOpts struct {
+	name string
+	ListOpts
+}
+
+var _ NamedOption = &NamedListOpts{}
+
+// NewNamedListOptsRef creates a reference to a new NamedListOpts struct.
+func NewNamedListOptsRef(name string, values *[]string, validator ValidatorFctType) *NamedListOpts {
+	return &NamedListOpts{
+		name:     name,
+		ListOpts: *NewListOptsRef(values, validator),
+	}
+}
+
+// Name returns the name of the NamedListOpts in the configuration.
+func (o *NamedListOpts) Name() string {
+	return o.name
+}
+
+//MapOpts holds a map of values and a validation function.
+type MapOpts struct {
+	values    map[string]string
+	validator ValidatorFctType
+}
+
+// Set validates if needed the input value and add it to the
+// internal map, by splitting on '='.
+func (opts *MapOpts) Set(value string) error {
+	if opts.validator != nil {
+		v, err := opts.validator(value)
+		if err != nil {
+			return err
+		}
+		value = v
+	}
+	vals := strings.SplitN(value, "=", 2)
+	if len(vals) == 1 {
+		(opts.values)[vals[0]] = ""
+	} else {
+		(opts.values)[vals[0]] = vals[1]
+	}
+	return nil
+}
+
+// GetAll returns the values of MapOpts as a map.
+func (opts *MapOpts) GetAll() map[string]string {
+	return opts.values
+}
+
+func (opts *MapOpts) String() string {
+	return fmt.Sprintf("%v", map[string]string((opts.values)))
+}
+
+// NewMapOpts creates a new MapOpts with the specified map of values and a validator.
+func NewMapOpts(values map[string]string, validator ValidatorFctType) *MapOpts {
+	if values == nil {
+		values = make(map[string]string)
+	}
+	return &MapOpts{
+		values:    values,
+		validator: validator,
+	}
+}
+
+// NamedMapOpts is a MapOpts struct with a configuration name.
+// This struct is useful to keep reference to the assigned
+// field name in the internal configuration struct.
+type NamedMapOpts struct {
+	name string
+	MapOpts
+}
+
+var _ NamedOption = &NamedMapOpts{}
+
+// NewNamedMapOpts creates a reference to a new NamedMapOpts struct.
+func NewNamedMapOpts(name string, values map[string]string, validator ValidatorFctType) *NamedMapOpts {
+	return &NamedMapOpts{
+		name:    name,
+		MapOpts: *NewMapOpts(values, validator),
+	}
+}
+
+// Name returns the name of the NamedMapOpts in the configuration.
+func (o *NamedMapOpts) Name() string {
+	return o.name
+}
+
+// ValidatorFctType defines a validator function that returns a validated string and/or an error.
+type ValidatorFctType func(val string) (string, error)
+
+// ValidatorFctListType defines a validator function that returns a validated list of string and/or an error
+type ValidatorFctListType func(val string) ([]string, error)
+
+// ValidateIPAddress validates an Ip address.
+func ValidateIPAddress(val string) (string, error) {
+	var ip = net.ParseIP(strings.TrimSpace(val))
+	if ip != nil {
+		return ip.String(), nil
+	}
+	return "", fmt.Errorf("%s is not an ip address", val)
+}
+
+// ValidateDNSSearch validates domain for resolvconf search configuration.
+// A zero length domain is represented by a dot (.).
+func ValidateDNSSearch(val string) (string, error) {
+	if val = strings.Trim(val, " "); val == "." {
+		return val, nil
+	}
+	return validateDomain(val)
+}
+
+func validateDomain(val string) (string, error) {
+	if alphaRegexp.FindString(val) == "" {
+		return "", fmt.Errorf("%s is not a valid domain", val)
+	}
+	ns := domainRegexp.FindSubmatch([]byte(val))
+	if len(ns) > 0 && len(ns[1]) < 255 {
+		return string(ns[1]), nil
+	}
+	return "", fmt.Errorf("%s is not a valid domain", val)
+}
+
+// ValidateLabel validates that the specified string is a valid label, and returns it.
+// Labels are in the form on key=value.
+func ValidateLabel(val string) (string, error) {
+	if strings.Count(val, "=") < 1 {
+		return "", fmt.Errorf("bad attribute format: %s", val)
+	}
+	return val, nil
+}