float32_slice.go

Documentation: github.com/spf13/pflag

     1  package pflag
     2  
     3  import (
     4  	"fmt"
     5  	"strconv"
     6  	"strings"
     7  )
     8  
     9  // -- float32Slice Value
    10  type float32SliceValue struct {
    11  	value   *[]float32
    12  	changed bool
    13  }
    14  
    15  func newFloat32SliceValue(val []float32, p *[]float32) *float32SliceValue {
    16  	isv := new(float32SliceValue)
    17  	isv.value = p
    18  	*isv.value = val
    19  	return isv
    20  }
    21  
    22  func (s *float32SliceValue) Set(val string) error {
    23  	ss := strings.Split(val, ",")
    24  	out := make([]float32, len(ss))
    25  	for i, d := range ss {
    26  		var err error
    27  		var temp64 float64
    28  		temp64, err = strconv.ParseFloat(d, 32)
    29  		if err != nil {
    30  			return err
    31  		}
    32  		out[i] = float32(temp64)
    33  
    34  	}
    35  	if !s.changed {
    36  		*s.value = out
    37  	} else {
    38  		*s.value = append(*s.value, out...)
    39  	}
    40  	s.changed = true
    41  	return nil
    42  }
    43  
    44  func (s *float32SliceValue) Type() string {
    45  	return "float32Slice"
    46  }
    47  
    48  func (s *float32SliceValue) String() string {
    49  	out := make([]string, len(*s.value))
    50  	for i, d := range *s.value {
    51  		out[i] = fmt.Sprintf("%f", d)
    52  	}
    53  	return "[" + strings.Join(out, ",") + "]"
    54  }
    55  
    56  func (s *float32SliceValue) fromString(val string) (float32, error) {
    57  	t64, err := strconv.ParseFloat(val, 32)
    58  	if err != nil {
    59  		return 0, err
    60  	}
    61  	return float32(t64), nil
    62  }
    63  
    64  func (s *float32SliceValue) toString(val float32) string {
    65  	return fmt.Sprintf("%f", val)
    66  }
    67  
    68  func (s *float32SliceValue) Append(val string) error {
    69  	i, err := s.fromString(val)
    70  	if err != nil {
    71  		return err
    72  	}
    73  	*s.value = append(*s.value, i)
    74  	return nil
    75  }
    76  
    77  func (s *float32SliceValue) Replace(val []string) error {
    78  	out := make([]float32, len(val))
    79  	for i, d := range val {
    80  		var err error
    81  		out[i], err = s.fromString(d)
    82  		if err != nil {
    83  			return err
    84  		}
    85  	}
    86  	*s.value = out
    87  	return nil
    88  }
    89  
    90  func (s *float32SliceValue) GetSlice() []string {
    91  	out := make([]string, len(*s.value))
    92  	for i, d := range *s.value {
    93  		out[i] = s.toString(d)
    94  	}
    95  	return out
    96  }
    97  
    98  func float32SliceConv(val string) (interface{}, error) {
    99  	val = strings.Trim(val, "[]")
   100  	// Empty string would cause a slice with one (empty) entry
   101  	if len(val) == 0 {
   102  		return []float32{}, nil
   103  	}
   104  	ss := strings.Split(val, ",")
   105  	out := make([]float32, len(ss))
   106  	for i, d := range ss {
   107  		var err error
   108  		var temp64 float64
   109  		temp64, err = strconv.ParseFloat(d, 32)
   110  		if err != nil {
   111  			return nil, err
   112  		}
   113  		out[i] = float32(temp64)
   114  
   115  	}
   116  	return out, nil
   117  }
   118  
   119  // GetFloat32Slice return the []float32 value of a flag with the given name
   120  func (f *FlagSet) GetFloat32Slice(name string) ([]float32, error) {
   121  	val, err := f.getFlagType(name, "float32Slice", float32SliceConv)
   122  	if err != nil {
   123  		return []float32{}, err
   124  	}
   125  	return val.([]float32), nil
   126  }
   127  
   128  // Float32SliceVar defines a float32Slice flag with specified name, default value, and usage string.
   129  // The argument p points to a []float32 variable in which to store the value of the flag.
   130  func (f *FlagSet) Float32SliceVar(p *[]float32, name string, value []float32, usage string) {
   131  	f.VarP(newFloat32SliceValue(value, p), name, "", usage)
   132  }
   133  
   134  // Float32SliceVarP is like Float32SliceVar, but accepts a shorthand letter that can be used after a single dash.
   135  func (f *FlagSet) Float32SliceVarP(p *[]float32, name, shorthand string, value []float32, usage string) {
   136  	f.VarP(newFloat32SliceValue(value, p), name, shorthand, usage)
   137  }
   138  
   139  // Float32SliceVar defines a float32[] flag with specified name, default value, and usage string.
   140  // The argument p points to a float32[] variable in which to store the value of the flag.
   141  func Float32SliceVar(p *[]float32, name string, value []float32, usage string) {
   142  	CommandLine.VarP(newFloat32SliceValue(value, p), name, "", usage)
   143  }
   144  
   145  // Float32SliceVarP is like Float32SliceVar, but accepts a shorthand letter that can be used after a single dash.
   146  func Float32SliceVarP(p *[]float32, name, shorthand string, value []float32, usage string) {
   147  	CommandLine.VarP(newFloat32SliceValue(value, p), name, shorthand, usage)
   148  }
   149  
   150  // Float32Slice defines a []float32 flag with specified name, default value, and usage string.
   151  // The return value is the address of a []float32 variable that stores the value of the flag.
   152  func (f *FlagSet) Float32Slice(name string, value []float32, usage string) *[]float32 {
   153  	p := []float32{}
   154  	f.Float32SliceVarP(&p, name, "", value, usage)
   155  	return &p
   156  }
   157  
   158  // Float32SliceP is like Float32Slice, but accepts a shorthand letter that can be used after a single dash.
   159  func (f *FlagSet) Float32SliceP(name, shorthand string, value []float32, usage string) *[]float32 {
   160  	p := []float32{}
   161  	f.Float32SliceVarP(&p, name, shorthand, value, usage)
   162  	return &p
   163  }
   164  
   165  // Float32Slice defines a []float32 flag with specified name, default value, and usage string.
   166  // The return value is the address of a []float32 variable that stores the value of the flag.
   167  func Float32Slice(name string, value []float32, usage string) *[]float32 {
   168  	return CommandLine.Float32SliceP(name, "", value, usage)
   169  }
   170  
   171  // Float32SliceP is like Float32Slice, but accepts a shorthand letter that can be used after a single dash.
   172  func Float32SliceP(name, shorthand string, value []float32, usage string) *[]float32 {
   173  	return CommandLine.Float32SliceP(name, shorthand, value, usage)
   174  }
   175
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