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https://gitea.com/Sirherobrine23/tea.git
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Co-authored-by: Norwin Roosen <git@nroo.de> Co-authored-by: Norwin <git@nroo.de> Reviewed-on: https://gitea.com/gitea/tea/pulls/390 Reviewed-by: 6543 <6543@obermui.de> Reviewed-by: Andrew Thornton <art27@cantab.net> Co-authored-by: Norwin <noerw@noreply.gitea.io> Co-committed-by: Norwin <noerw@noreply.gitea.io>
345 lines
7.9 KiB
Go
345 lines
7.9 KiB
Go
package chroma
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import (
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"fmt"
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"strings"
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)
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// Trilean value for StyleEntry value inheritance.
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type Trilean uint8
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// Trilean states.
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const (
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Pass Trilean = iota
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Yes
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No
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)
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func (t Trilean) String() string {
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switch t {
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case Yes:
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return "Yes"
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case No:
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return "No"
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default:
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return "Pass"
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}
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}
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// Prefix returns s with "no" as a prefix if Trilean is no.
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func (t Trilean) Prefix(s string) string {
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if t == Yes {
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return s
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} else if t == No {
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return "no" + s
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}
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return ""
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}
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// A StyleEntry in the Style map.
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type StyleEntry struct {
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// Hex colours.
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Colour Colour
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Background Colour
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Border Colour
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Bold Trilean
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Italic Trilean
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Underline Trilean
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NoInherit bool
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}
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func (s StyleEntry) String() string {
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out := []string{}
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if s.Bold != Pass {
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out = append(out, s.Bold.Prefix("bold"))
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}
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if s.Italic != Pass {
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out = append(out, s.Italic.Prefix("italic"))
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}
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if s.Underline != Pass {
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out = append(out, s.Underline.Prefix("underline"))
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}
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if s.NoInherit {
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out = append(out, "noinherit")
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}
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if s.Colour.IsSet() {
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out = append(out, s.Colour.String())
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}
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if s.Background.IsSet() {
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out = append(out, "bg:"+s.Background.String())
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}
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if s.Border.IsSet() {
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out = append(out, "border:"+s.Border.String())
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}
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return strings.Join(out, " ")
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}
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// Sub subtracts e from s where elements match.
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func (s StyleEntry) Sub(e StyleEntry) StyleEntry {
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out := StyleEntry{}
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if e.Colour != s.Colour {
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out.Colour = s.Colour
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}
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if e.Background != s.Background {
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out.Background = s.Background
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}
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if e.Bold != s.Bold {
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out.Bold = s.Bold
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}
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if e.Italic != s.Italic {
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out.Italic = s.Italic
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}
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if e.Underline != s.Underline {
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out.Underline = s.Underline
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}
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if e.Border != s.Border {
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out.Border = s.Border
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}
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return out
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}
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// Inherit styles from ancestors.
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//
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// Ancestors should be provided from oldest to newest.
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func (s StyleEntry) Inherit(ancestors ...StyleEntry) StyleEntry {
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out := s
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for i := len(ancestors) - 1; i >= 0; i-- {
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if out.NoInherit {
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return out
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}
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ancestor := ancestors[i]
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if !out.Colour.IsSet() {
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out.Colour = ancestor.Colour
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}
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if !out.Background.IsSet() {
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out.Background = ancestor.Background
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}
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if !out.Border.IsSet() {
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out.Border = ancestor.Border
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}
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if out.Bold == Pass {
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out.Bold = ancestor.Bold
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}
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if out.Italic == Pass {
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out.Italic = ancestor.Italic
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}
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if out.Underline == Pass {
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out.Underline = ancestor.Underline
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}
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}
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return out
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}
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func (s StyleEntry) IsZero() bool {
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return s.Colour == 0 && s.Background == 0 && s.Border == 0 && s.Bold == Pass && s.Italic == Pass &&
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s.Underline == Pass && !s.NoInherit
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}
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// A StyleBuilder is a mutable structure for building styles.
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//
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// Once built, a Style is immutable.
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type StyleBuilder struct {
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entries map[TokenType]string
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name string
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parent *Style
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}
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func NewStyleBuilder(name string) *StyleBuilder {
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return &StyleBuilder{name: name, entries: map[TokenType]string{}}
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}
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func (s *StyleBuilder) AddAll(entries StyleEntries) *StyleBuilder {
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for ttype, entry := range entries {
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s.entries[ttype] = entry
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}
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return s
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}
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func (s *StyleBuilder) Get(ttype TokenType) StyleEntry {
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// This is less than ideal, but it's the price for having to check errors on each Add().
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entry, _ := ParseStyleEntry(s.entries[ttype])
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return entry.Inherit(s.parent.Get(ttype))
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}
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// Add an entry to the Style map.
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//
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// See http://pygments.org/docs/styles/#style-rules for details.
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func (s *StyleBuilder) Add(ttype TokenType, entry string) *StyleBuilder { // nolint: gocyclo
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s.entries[ttype] = entry
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return s
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}
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func (s *StyleBuilder) AddEntry(ttype TokenType, entry StyleEntry) *StyleBuilder {
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s.entries[ttype] = entry.String()
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return s
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}
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func (s *StyleBuilder) Build() (*Style, error) {
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style := &Style{
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Name: s.name,
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entries: map[TokenType]StyleEntry{},
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parent: s.parent,
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}
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for ttype, descriptor := range s.entries {
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entry, err := ParseStyleEntry(descriptor)
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if err != nil {
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return nil, fmt.Errorf("invalid entry for %s: %s", ttype, err)
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}
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style.entries[ttype] = entry
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}
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return style, nil
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}
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// StyleEntries mapping TokenType to colour definition.
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type StyleEntries map[TokenType]string
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// NewStyle creates a new style definition.
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func NewStyle(name string, entries StyleEntries) (*Style, error) {
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return NewStyleBuilder(name).AddAll(entries).Build()
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}
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// MustNewStyle creates a new style or panics.
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func MustNewStyle(name string, entries StyleEntries) *Style {
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style, err := NewStyle(name, entries)
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if err != nil {
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panic(err)
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}
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return style
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}
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// A Style definition.
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//
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// See http://pygments.org/docs/styles/ for details. Semantics are intended to be identical.
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type Style struct {
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Name string
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entries map[TokenType]StyleEntry
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parent *Style
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}
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// Types that are styled.
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func (s *Style) Types() []TokenType {
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dedupe := map[TokenType]bool{}
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for tt := range s.entries {
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dedupe[tt] = true
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}
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if s.parent != nil {
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for _, tt := range s.parent.Types() {
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dedupe[tt] = true
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}
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}
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out := make([]TokenType, 0, len(dedupe))
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for tt := range dedupe {
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out = append(out, tt)
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}
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return out
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}
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// Builder creates a mutable builder from this Style.
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//
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// The builder can then be safely modified. This is a cheap operation.
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func (s *Style) Builder() *StyleBuilder {
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return &StyleBuilder{
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name: s.Name,
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entries: map[TokenType]string{},
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parent: s,
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}
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}
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// Has checks if an exact style entry match exists for a token type.
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//
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// This is distinct from Get() which will merge parent tokens.
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func (s *Style) Has(ttype TokenType) bool {
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return !s.get(ttype).IsZero() || s.synthesisable(ttype)
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}
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// Get a style entry. Will try sub-category or category if an exact match is not found, and
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// finally return the Background.
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func (s *Style) Get(ttype TokenType) StyleEntry {
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return s.get(ttype).Inherit(
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s.get(Background),
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s.get(Text),
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s.get(ttype.Category()),
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s.get(ttype.SubCategory()))
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}
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func (s *Style) get(ttype TokenType) StyleEntry {
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out := s.entries[ttype]
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if out.IsZero() && s.parent != nil {
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return s.parent.get(ttype)
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}
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if out.IsZero() && s.synthesisable(ttype) {
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out = s.synthesise(ttype)
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}
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return out
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}
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func (s *Style) synthesise(ttype TokenType) StyleEntry {
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bg := s.get(Background)
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text := StyleEntry{Colour: bg.Colour}
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text.Colour = text.Colour.BrightenOrDarken(0.5)
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switch ttype {
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// If we don't have a line highlight colour, make one that is 10% brighter/darker than the background.
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case LineHighlight:
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return StyleEntry{Background: bg.Background.BrightenOrDarken(0.1)}
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// If we don't have line numbers, use the text colour but 20% brighter/darker
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case LineNumbers, LineNumbersTable:
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return text
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default:
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return StyleEntry{}
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}
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}
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func (s *Style) synthesisable(ttype TokenType) bool {
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return ttype == LineHighlight || ttype == LineNumbers || ttype == LineNumbersTable
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}
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// ParseStyleEntry parses a Pygments style entry.
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func ParseStyleEntry(entry string) (StyleEntry, error) { // nolint: gocyclo
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out := StyleEntry{}
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parts := strings.Fields(entry)
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for _, part := range parts {
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switch {
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case part == "italic":
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out.Italic = Yes
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case part == "noitalic":
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out.Italic = No
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case part == "bold":
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out.Bold = Yes
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case part == "nobold":
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out.Bold = No
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case part == "underline":
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out.Underline = Yes
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case part == "nounderline":
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out.Underline = No
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case part == "inherit":
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out.NoInherit = false
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case part == "noinherit":
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out.NoInherit = true
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case part == "bg:":
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out.Background = 0
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case strings.HasPrefix(part, "bg:#"):
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out.Background = ParseColour(part[3:])
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if !out.Background.IsSet() {
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return StyleEntry{}, fmt.Errorf("invalid background colour %q", part)
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}
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case strings.HasPrefix(part, "border:#"):
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out.Border = ParseColour(part[7:])
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if !out.Border.IsSet() {
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return StyleEntry{}, fmt.Errorf("invalid border colour %q", part)
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}
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case strings.HasPrefix(part, "#"):
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out.Colour = ParseColour(part)
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if !out.Colour.IsSet() {
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return StyleEntry{}, fmt.Errorf("invalid colour %q", part)
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}
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default:
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return StyleEntry{}, fmt.Errorf("unknown style element %q", part)
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}
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}
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return out, nil
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}
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