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forgejo/modules/highlight/highlight.go
wxiaoguang 0747592865
Adjust line detection in highlight.go (#20612)
The code for detection of lines in highlight.go is somewhat too complex
and doesn't take account of how Chroma is actually splitting things into
lines for us.

Remove both the .line and .cl classes from Chroma's HTML which made
the old conditional work again. This fixed Copy of YAML files while also 
reducing the amount of rendered HTML nodes.

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Lauris BH <lauris@nix.lv>
2022-08-03 01:37:28 +08:00

229 lines
5.4 KiB
Go

// Copyright 2015 The Gogs Authors. All rights reserved.
// Copyright 2020 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package highlight
import (
"bufio"
"bytes"
"fmt"
gohtml "html"
"path/filepath"
"strings"
"sync"
"code.gitea.io/gitea/modules/analyze"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"github.com/alecthomas/chroma"
"github.com/alecthomas/chroma/formatters/html"
"github.com/alecthomas/chroma/lexers"
"github.com/alecthomas/chroma/styles"
lru "github.com/hashicorp/golang-lru"
)
// don't index files larger than this many bytes for performance purposes
const sizeLimit = 1024 * 1024
var (
// For custom user mapping
highlightMapping = map[string]string{}
once sync.Once
cache *lru.TwoQueueCache
)
// NewContext loads custom highlight map from local config
func NewContext() {
once.Do(func() {
keys := setting.Cfg.Section("highlight.mapping").Keys()
for i := range keys {
highlightMapping[keys[i].Name()] = keys[i].Value()
}
// The size 512 is simply a conservative rule of thumb
c, err := lru.New2Q(512)
if err != nil {
panic(fmt.Sprintf("failed to initialize LRU cache for highlighter: %s", err))
}
cache = c
})
}
// Code returns a HTML version of code string with chroma syntax highlighting classes
func Code(fileName, language, code string) string {
NewContext()
// diff view newline will be passed as empty, change to literal '\n' so it can be copied
// preserve literal newline in blame view
if code == "" || code == "\n" {
return "\n"
}
if len(code) > sizeLimit {
return code
}
var lexer chroma.Lexer
if len(language) > 0 {
lexer = lexers.Get(language)
if lexer == nil {
// Attempt stripping off the '?'
if idx := strings.IndexByte(language, '?'); idx > 0 {
lexer = lexers.Get(language[:idx])
}
}
}
if lexer == nil {
if val, ok := highlightMapping[filepath.Ext(fileName)]; ok {
// use mapped value to find lexer
lexer = lexers.Get(val)
}
}
if lexer == nil {
if l, ok := cache.Get(fileName); ok {
lexer = l.(chroma.Lexer)
}
}
if lexer == nil {
lexer = lexers.Match(fileName)
if lexer == nil {
lexer = lexers.Fallback
}
cache.Add(fileName, lexer)
}
return CodeFromLexer(lexer, code)
}
type nopPreWrapper struct{}
func (nopPreWrapper) Start(code bool, styleAttr string) string { return "" }
func (nopPreWrapper) End(code bool) string { return "" }
// CodeFromLexer returns a HTML version of code string with chroma syntax highlighting classes
func CodeFromLexer(lexer chroma.Lexer, code string) string {
formatter := html.New(html.WithClasses(true),
html.WithLineNumbers(false),
html.PreventSurroundingPre(true),
)
htmlbuf := bytes.Buffer{}
htmlw := bufio.NewWriter(&htmlbuf)
iterator, err := lexer.Tokenise(nil, string(code))
if err != nil {
log.Error("Can't tokenize code: %v", err)
return code
}
// style not used for live site but need to pass something
err = formatter.Format(htmlw, styles.GitHub, iterator)
if err != nil {
log.Error("Can't format code: %v", err)
return code
}
_ = htmlw.Flush()
// Chroma will add newlines for certain lexers in order to highlight them properly
// Once highlighted, strip them here, so they don't cause copy/paste trouble in HTML output
return strings.TrimSuffix(htmlbuf.String(), "\n")
}
// File returns a slice of chroma syntax highlighted lines of code
func File(numLines int, fileName, language string, code []byte) []string {
NewContext()
if len(code) > sizeLimit {
return plainText(string(code), numLines)
}
formatter := html.New(html.WithClasses(true),
html.WithLineNumbers(false),
html.WithPreWrapper(nopPreWrapper{}),
)
if formatter == nil {
log.Error("Couldn't create chroma formatter")
return plainText(string(code), numLines)
}
htmlbuf := bytes.Buffer{}
htmlw := bufio.NewWriter(&htmlbuf)
var lexer chroma.Lexer
// provided language overrides everything
if len(language) > 0 {
lexer = lexers.Get(language)
}
if lexer == nil {
if val, ok := highlightMapping[filepath.Ext(fileName)]; ok {
lexer = lexers.Get(val)
}
}
if lexer == nil {
language := analyze.GetCodeLanguage(fileName, code)
lexer = lexers.Get(language)
if lexer == nil {
lexer = lexers.Match(fileName)
if lexer == nil {
lexer = lexers.Fallback
}
}
}
iterator, err := lexer.Tokenise(nil, string(code))
if err != nil {
log.Error("Can't tokenize code: %v", err)
return plainText(string(code), numLines)
}
err = formatter.Format(htmlw, styles.GitHub, iterator)
if err != nil {
log.Error("Can't format code: %v", err)
return plainText(string(code), numLines)
}
_ = htmlw.Flush()
finalNewLine := false
if len(code) > 0 {
finalNewLine = code[len(code)-1] == '\n'
}
m := strings.SplitN(htmlbuf.String(), `</span></span><span class="line"><span class="cl">`, numLines)
if len(m) > 0 {
m[0] = m[0][len(`<span class="line"><span class="cl">`):]
last := m[len(m)-1]
m[len(m)-1] = last[:len(last)-len(`</span></span>`)]
}
if finalNewLine {
m = append(m, "<span class=\"w\">\n</span>")
}
return m
}
// return unhiglighted map
func plainText(code string, numLines int) []string {
m := strings.SplitN(code, "\n", numLines)
for i, content := range m {
// need to keep lines that are only \n so copy/paste works properly in browser
if content == "" {
content = "\n"
}
m[i] = gohtml.EscapeString(content)
}
return m
}