mirror of
https://github.com/go-gitea/gitea
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162 lines
3.8 KiB
Go
162 lines
3.8 KiB
Go
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// Package internal contains common API functions and structures shared between lexer packages.
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package internal
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import (
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"path/filepath"
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"sort"
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"strings"
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"github.com/danwakefield/fnmatch"
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"github.com/alecthomas/chroma"
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)
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// Registry of Lexers.
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var Registry = struct {
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Lexers chroma.Lexers
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byName map[string]chroma.Lexer
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byAlias map[string]chroma.Lexer
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}{
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byName: map[string]chroma.Lexer{},
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byAlias: map[string]chroma.Lexer{},
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}
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// Names of all lexers, optionally including aliases.
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func Names(withAliases bool) []string {
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out := []string{}
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for _, lexer := range Registry.Lexers {
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config := lexer.Config()
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out = append(out, config.Name)
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if withAliases {
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out = append(out, config.Aliases...)
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}
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}
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sort.Strings(out)
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return out
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}
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// Get a Lexer by name, alias or file extension.
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func Get(name string) chroma.Lexer {
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if lexer := Registry.byName[name]; lexer != nil {
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return lexer
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}
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if lexer := Registry.byAlias[name]; lexer != nil {
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return lexer
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}
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if lexer := Registry.byName[strings.ToLower(name)]; lexer != nil {
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return lexer
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}
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if lexer := Registry.byAlias[strings.ToLower(name)]; lexer != nil {
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return lexer
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}
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candidates := chroma.PrioritisedLexers{}
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// Try file extension.
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if lexer := Match("filename." + name); lexer != nil {
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candidates = append(candidates, lexer)
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}
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// Try exact filename.
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if lexer := Match(name); lexer != nil {
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candidates = append(candidates, lexer)
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}
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if len(candidates) == 0 {
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return nil
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}
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sort.Sort(candidates)
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return candidates[0]
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}
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// MatchMimeType attempts to find a lexer for the given MIME type.
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func MatchMimeType(mimeType string) chroma.Lexer {
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matched := chroma.PrioritisedLexers{}
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for _, l := range Registry.Lexers {
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for _, lmt := range l.Config().MimeTypes {
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if mimeType == lmt {
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matched = append(matched, l)
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}
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}
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}
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if len(matched) != 0 {
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sort.Sort(matched)
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return matched[0]
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}
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return nil
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}
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// Match returns the first lexer matching filename.
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func Match(filename string) chroma.Lexer {
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filename = filepath.Base(filename)
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matched := chroma.PrioritisedLexers{}
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// First, try primary filename matches.
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for _, lexer := range Registry.Lexers {
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config := lexer.Config()
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for _, glob := range config.Filenames {
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if fnmatch.Match(glob, filename, 0) {
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matched = append(matched, lexer)
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}
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}
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}
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if len(matched) > 0 {
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sort.Sort(matched)
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return matched[0]
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}
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matched = nil
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// Next, try filename aliases.
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for _, lexer := range Registry.Lexers {
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config := lexer.Config()
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for _, glob := range config.AliasFilenames {
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if fnmatch.Match(glob, filename, 0) {
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matched = append(matched, lexer)
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}
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}
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}
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if len(matched) > 0 {
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sort.Sort(matched)
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return matched[0]
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}
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return nil
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}
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// Analyse text content and return the "best" lexer..
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func Analyse(text string) chroma.Lexer {
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var picked chroma.Lexer
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highest := float32(0.0)
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for _, lexer := range Registry.Lexers {
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if analyser, ok := lexer.(chroma.Analyser); ok {
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weight := analyser.AnalyseText(text)
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if weight > highest {
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picked = lexer
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highest = weight
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}
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}
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}
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return picked
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}
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// Register a Lexer with the global registry.
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func Register(lexer chroma.Lexer) chroma.Lexer {
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config := lexer.Config()
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Registry.byName[config.Name] = lexer
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Registry.byName[strings.ToLower(config.Name)] = lexer
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for _, alias := range config.Aliases {
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Registry.byAlias[alias] = lexer
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Registry.byAlias[strings.ToLower(alias)] = lexer
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}
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Registry.Lexers = append(Registry.Lexers, lexer)
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return lexer
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}
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// Used for the fallback lexer as well as the explicit plaintext lexer
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var PlaintextRules = chroma.Rules{
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"root": []chroma.Rule{
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{`.+`, chroma.Text, nil},
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{`\n`, chroma.Text, nil},
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},
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}
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// Fallback lexer if no other is found.
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var Fallback chroma.Lexer = chroma.MustNewLexer(&chroma.Config{
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Name: "fallback",
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Filenames: []string{"*"},
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}, PlaintextRules)
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