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mirror of https://github.com/alecthomas/chroma.git synced 2025-01-22 03:10:16 +02:00
2017-09-18 13:15:07 +10:00

97 lines
2.5 KiB
Go

package chroma
import (
"fmt"
"strconv"
"strings"
)
// ANSI2RGB maps ANSI colour names, as supported by Chroma, to hex RGB values.
var ANSI2RGB = map[string]string{
"#ansiblack": "000000",
"#ansidarkred": "7f0000",
"#ansidarkgreen": "007f00",
"#ansibrown": "7f7fe0",
"#ansidarkblue": "00007f",
"#ansipurple": "7f007f",
"#ansiteal": "007f7f",
"#ansilightgray": "e5e5e5",
// Normal
"#ansidarkgray": "555555",
"#ansired": "ff0000",
"#ansigreen": "00ff00",
"#ansiyellow": "ffff00",
"#ansiblue": "0000ff",
"#ansifuchsia": "ff00ff",
"#ansiturquoise": "00ffff",
"#ansiwhite": "ffffff",
// Aliases without the "ansi" prefix, because...why?
"#black": "000000",
"#darkred": "7f0000",
"#darkgreen": "007f00",
"#brown": "7f7fe0",
"#darkblue": "00007f",
"#purple": "7f007f",
"#teal": "007f7f",
"#lightgray": "e5e5e5",
// Normal
"#darkgray": "555555",
"#red": "ff0000",
"#green": "00ff00",
"#yellow": "ffff00",
"#blue": "0000ff",
"#fuchsia": "ff00ff",
"#turquoise": "00ffff",
"#white": "ffffff",
}
// Colour represents an RGB colour.
type Colour int32
// ParseColour in the forms #rgb, #rrggbb, #ansi<colour>, or #<colour>.
// Will panic if colour is in an invalid format.
func ParseColour(colour string) Colour {
colour = normaliseColour(colour)
n, err := strconv.ParseUint(colour, 16, 32)
if err != nil {
panic(err)
}
return Colour(n + 1)
}
func (c Colour) IsSet() bool { return c != 0 }
func (c Colour) String() string { return fmt.Sprintf("#%06x", int(c-1)) }
func (c Colour) GoString() string { return fmt.Sprintf("Colour(0x%06x)", int(c-1)) }
// Red component of colour.
func (c Colour) Red() uint8 { return uint8(((c - 1) >> 16) & 0xff) }
// Green component of colour.
func (c Colour) Green() uint8 { return uint8(((c - 1) >> 8) & 0xff) }
// Blue component of colour.
func (c Colour) Blue() uint8 { return uint8((c - 1) & 0xff) }
// Colours is an orderable set of colours.
type Colours []Colour
func (c Colours) Len() int { return len(c) }
func (c Colours) Swap(i, j int) { c[i], c[j] = c[j], c[i] }
func (c Colours) Less(i, j int) bool { return c[i] < c[j] }
// Convert colours to #rrggbb.
func normaliseColour(colour string) string {
if ansi, ok := ANSI2RGB[colour]; ok {
return ansi
}
if strings.HasPrefix(colour, "#") {
colour = colour[1:]
if len(colour) == 3 {
return colour[0:1] + colour[0:1] + colour[1:2] + colour[1:2] + colour[2:3] + colour[2:3]
}
}
return colour
}