style.go RawHistoryFolder

1package core
2
3type RGB struct {
4	R uint8
5	G uint8
6	B uint8
7}
8
9type StyleAttrs uint16
10
11const (
12	AttrDim StyleAttrs = 1 << iota
13	AttrUnderline
14	AttrBlink
15	AttrStrikethrough
16)
17
18type UnderlineStyle uint8
19
20const (
21	UnderlineNone UnderlineStyle = iota
22	UnderlineSingle
23	UnderlineDouble
24	UnderlineCurly
25	UnderlineDotted
26	UnderlineDashed
27)
28
29type Style struct {
30	Bold       bool
31	Italic     bool
32	Inverse    bool
33	Attrs      StyleAttrs
34	Foreground int // -1 means unset; ignored when HasForegroundRGB is true
35	Background int // -1 means unset; ignored when HasBackgroundRGB is true
36
37	HasForegroundRGB bool
38	ForegroundRGB    RGB
39	HasBackgroundRGB bool
40	BackgroundRGB    RGB
41
42	UnderlineStyle       UnderlineStyle
43	HasUnderlineColor    bool
44	UnderlineColor       int // ignored when HasUnderlineColorRGB is true
45	HasUnderlineColorRGB bool
46	UnderlineColorRGB    RGB
47}
48
49func DefaultStyle() Style { return Style{Foreground: -1, Background: -1} }
50
51// Canonical returns the unique representation of s under Equal. Fields that
52// are inactive for the selected color form are cleared. Canonical does not
53// treat the zero Style as the default style: indexed color zero remains
54// distinct from the unset colors returned by DefaultStyle.
55func (s Style) Canonical() Style {
56	if s.HasForegroundRGB {
57		s.Foreground = 0
58	} else {
59		s.ForegroundRGB = RGB{}
60	}
61	if s.HasBackgroundRGB {
62		s.Background = 0
63	} else {
64		s.BackgroundRGB = RGB{}
65	}
66	if s.HasUnderlineColorRGB {
67		s.HasUnderlineColor = false
68		s.UnderlineColor = 0
69	} else {
70		s.UnderlineColorRGB = RGB{}
71		if !s.HasUnderlineColor {
72			s.UnderlineColor = 0
73		}
74	}
75	return s
76}
77
78func (s Style) Equal(other Style) bool {
79	if s.Bold != other.Bold || s.Italic != other.Italic || s.Inverse != other.Inverse || s.Attrs != other.Attrs || s.UnderlineStyle != other.UnderlineStyle {
80		return false
81	}
82	if s.HasForegroundRGB != other.HasForegroundRGB || s.HasBackgroundRGB != other.HasBackgroundRGB || s.HasUnderlineColorRGB != other.HasUnderlineColorRGB {
83		return false
84	}
85	if s.HasForegroundRGB {
86		if s.ForegroundRGB != other.ForegroundRGB {
87			return false
88		}
89	} else if s.Foreground != other.Foreground {
90		return false
91	}
92	if s.HasBackgroundRGB {
93		if s.BackgroundRGB != other.BackgroundRGB {
94			return false
95		}
96	} else if s.Background != other.Background {
97		return false
98	}
99	if s.HasUnderlineColorRGB {
100		return s.UnderlineColorRGB == other.UnderlineColorRGB
101	}
102	if s.HasUnderlineColor != other.HasUnderlineColor {
103		return false
104	}
105	if s.HasUnderlineColor {
106		return s.UnderlineColor == other.UnderlineColor
107	}
108	return true
109}