76 lines
1.4 KiB
Go
76 lines
1.4 KiB
Go
|
package color
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"io"
|
||
|
|
"strconv"
|
||
|
|
)
|
||
|
|
|
||
|
|
// T represents a color
|
||
|
|
type T uint32
|
||
|
|
|
||
|
|
// FromName returns the integer value of a color name
|
||
|
|
// from the built-in color map ; it is case insensitive
|
||
|
|
func FromName(t Theme, s string) (T, error) {
|
||
|
|
value, ok := t[s]
|
||
|
|
if !ok {
|
||
|
|
return 0, fmt.Errorf("unknown color name '%s'", s)
|
||
|
|
}
|
||
|
|
return value, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// FromHex returns the integer value associated with
|
||
|
|
// an hexadecimal string (full-sized or short version)
|
||
|
|
// the format is 'abc' or 'abcdef'
|
||
|
|
func FromHex(s string) (T, error) {
|
||
|
|
if len(s) != 3 && len(s) != 6 {
|
||
|
|
return 0, fmt.Errorf("expect a size of 3 or 6 (without the '#' prefix)")
|
||
|
|
}
|
||
|
|
|
||
|
|
// short version
|
||
|
|
input := s
|
||
|
|
if len(s) == 3 {
|
||
|
|
input = fmt.Sprintf("%c%c%c%c%c%c", s[0], s[0], s[1], s[1], s[2], s[2])
|
||
|
|
}
|
||
|
|
|
||
|
|
n, err := strconv.ParseUint(input, 16, 32)
|
||
|
|
if err != nil {
|
||
|
|
return 0, err
|
||
|
|
}
|
||
|
|
|
||
|
|
return T(n), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Parse tries to parse a color string (can be a name or an hexa value)
|
||
|
|
func Parse(t Theme, s string) (T, error) {
|
||
|
|
|
||
|
|
// (0) ...
|
||
|
|
if len(s) < 1 {
|
||
|
|
return 0, io.ErrUnexpectedEOF
|
||
|
|
}
|
||
|
|
|
||
|
|
// (1) hexa
|
||
|
|
if s[0] == '#' {
|
||
|
|
return FromHex(s[1:])
|
||
|
|
}
|
||
|
|
|
||
|
|
// (2) name
|
||
|
|
return FromName(t, s)
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
// Red component of the color
|
||
|
|
func (c T) Red() uint8 {
|
||
|
|
return uint8((c >> 16) & 0xff)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Green component of the color
|
||
|
|
func (c T) Green() uint8 {
|
||
|
|
return uint8((c >> 8) & 0xff)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Blue component of the color
|
||
|
|
func (c T) Blue() uint8 {
|
||
|
|
return uint8(c & 0xff)
|
||
|
|
}
|