mirror of
https://github.com/go-gitea/gitea.git
synced 2024-12-04 14:46:57 -05:00
af7ffaa279
* Server-side syntax hilighting for all code This PR does a few things: * Remove all traces of highlight.js * Use chroma library to provide fast syntax hilighting directly on the server * Provide syntax hilighting for diffs * Re-style both unified and split diffs views * Add custom syntax hilighting styling for both regular and arc-green Fixes #7729 Fixes #10157 Fixes #11825 Fixes #7728 Fixes #3872 Fixes #3682 And perhaps gets closer to #9553 * fix line marker * fix repo search * Fix single line select * properly load settings * npm uninstall highlight.js * review suggestion * code review * forgot to call function * fix test * Apply suggestions from code review suggestions from @silverwind thanks Co-authored-by: silverwind <me@silverwind.io> * code review * copy/paste error * Use const for highlight size limit * Update web_src/less/_repository.less Co-authored-by: Lauris BH <lauris@nix.lv> * update size limit to 1MB and other styling tweaks * fix highlighting for certain diff sections * fix test * add worker back as suggested Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: Lauris BH <lauris@nix.lv>
548 lines
15 KiB
Go
Vendored
548 lines
15 KiB
Go
Vendored
// package highlighting is a extension for the goldmark(http://github.com/yuin/goldmark).
|
|
//
|
|
// This extension adds syntax-highlighting to the fenced code blocks using
|
|
// chroma(https://github.com/alecthomas/chroma).
|
|
package highlighting
|
|
|
|
import (
|
|
"bytes"
|
|
"io"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/yuin/goldmark"
|
|
"github.com/yuin/goldmark/ast"
|
|
"github.com/yuin/goldmark/parser"
|
|
"github.com/yuin/goldmark/renderer"
|
|
"github.com/yuin/goldmark/renderer/html"
|
|
"github.com/yuin/goldmark/text"
|
|
"github.com/yuin/goldmark/util"
|
|
|
|
"github.com/alecthomas/chroma"
|
|
chromahtml "github.com/alecthomas/chroma/formatters/html"
|
|
"github.com/alecthomas/chroma/lexers"
|
|
"github.com/alecthomas/chroma/styles"
|
|
)
|
|
|
|
// ImmutableAttributes is a read-only interface for ast.Attributes.
|
|
type ImmutableAttributes interface {
|
|
// Get returns (value, true) if an attribute associated with given
|
|
// name exists, otherwise (nil, false)
|
|
Get(name []byte) (interface{}, bool)
|
|
|
|
// GetString returns (value, true) if an attribute associated with given
|
|
// name exists, otherwise (nil, false)
|
|
GetString(name string) (interface{}, bool)
|
|
|
|
// All returns all attributes.
|
|
All() []ast.Attribute
|
|
}
|
|
|
|
type immutableAttributes struct {
|
|
n ast.Node
|
|
}
|
|
|
|
func (a *immutableAttributes) Get(name []byte) (interface{}, bool) {
|
|
return a.n.Attribute(name)
|
|
}
|
|
|
|
func (a *immutableAttributes) GetString(name string) (interface{}, bool) {
|
|
return a.n.AttributeString(name)
|
|
}
|
|
|
|
func (a *immutableAttributes) All() []ast.Attribute {
|
|
if a.n.Attributes() == nil {
|
|
return []ast.Attribute{}
|
|
}
|
|
return a.n.Attributes()
|
|
}
|
|
|
|
// CodeBlockContext holds contextual information of code highlighting.
|
|
type CodeBlockContext interface {
|
|
// Language returns (language, true) if specified, otherwise (nil, false).
|
|
Language() ([]byte, bool)
|
|
|
|
// Highlighted returns true if this code block can be highlighted, otherwise false.
|
|
Highlighted() bool
|
|
|
|
// Attributes return attributes of the code block.
|
|
Attributes() ImmutableAttributes
|
|
}
|
|
|
|
type codeBlockContext struct {
|
|
language []byte
|
|
highlighted bool
|
|
attributes ImmutableAttributes
|
|
}
|
|
|
|
func newCodeBlockContext(language []byte, highlighted bool, attrs ImmutableAttributes) CodeBlockContext {
|
|
return &codeBlockContext{
|
|
language: language,
|
|
highlighted: highlighted,
|
|
attributes: attrs,
|
|
}
|
|
}
|
|
|
|
func (c *codeBlockContext) Language() ([]byte, bool) {
|
|
if c.language != nil {
|
|
return c.language, true
|
|
}
|
|
return nil, false
|
|
}
|
|
|
|
func (c *codeBlockContext) Highlighted() bool {
|
|
return c.highlighted
|
|
}
|
|
|
|
func (c *codeBlockContext) Attributes() ImmutableAttributes {
|
|
return c.attributes
|
|
}
|
|
|
|
// WrapperRenderer renders wrapper elements like div, pre, etc.
|
|
type WrapperRenderer func(w util.BufWriter, context CodeBlockContext, entering bool)
|
|
|
|
// CodeBlockOptions creates Chroma options per code block.
|
|
type CodeBlockOptions func(ctx CodeBlockContext) []chromahtml.Option
|
|
|
|
// Config struct holds options for the extension.
|
|
type Config struct {
|
|
html.Config
|
|
|
|
// Style is a highlighting style.
|
|
// Supported styles are defined under https://github.com/alecthomas/chroma/tree/master/formatters.
|
|
Style string
|
|
|
|
// If set, will try to guess language if none provided.
|
|
// If the guessing fails, we will fall back to a text lexer.
|
|
// Note that while Chroma's API supports language guessing, the implementation
|
|
// is not there yet, so you will currently always get the basic text lexer.
|
|
GuessLanguage bool
|
|
|
|
// FormatOptions is a option related to output formats.
|
|
// See https://github.com/alecthomas/chroma#the-html-formatter for details.
|
|
FormatOptions []chromahtml.Option
|
|
|
|
// CSSWriter is an io.Writer that will be used as CSS data output buffer.
|
|
// If WithClasses() is enabled, you can get CSS data corresponds to the style.
|
|
CSSWriter io.Writer
|
|
|
|
// CodeBlockOptions allows set Chroma options per code block.
|
|
CodeBlockOptions CodeBlockOptions
|
|
|
|
// WrapperRenderer allows you to change wrapper elements.
|
|
WrapperRenderer WrapperRenderer
|
|
}
|
|
|
|
// NewConfig returns a new Config with defaults.
|
|
func NewConfig() Config {
|
|
return Config{
|
|
Config: html.NewConfig(),
|
|
Style: "github",
|
|
FormatOptions: []chromahtml.Option{},
|
|
CSSWriter: nil,
|
|
WrapperRenderer: nil,
|
|
CodeBlockOptions: nil,
|
|
}
|
|
}
|
|
|
|
// SetOption implements renderer.SetOptioner.
|
|
func (c *Config) SetOption(name renderer.OptionName, value interface{}) {
|
|
switch name {
|
|
case optStyle:
|
|
c.Style = value.(string)
|
|
case optFormatOptions:
|
|
if value != nil {
|
|
c.FormatOptions = value.([]chromahtml.Option)
|
|
}
|
|
case optCSSWriter:
|
|
c.CSSWriter = value.(io.Writer)
|
|
case optWrapperRenderer:
|
|
c.WrapperRenderer = value.(WrapperRenderer)
|
|
case optCodeBlockOptions:
|
|
c.CodeBlockOptions = value.(CodeBlockOptions)
|
|
case optGuessLanguage:
|
|
c.GuessLanguage = value.(bool)
|
|
default:
|
|
c.Config.SetOption(name, value)
|
|
}
|
|
}
|
|
|
|
// Option interface is a functional option interface for the extension.
|
|
type Option interface {
|
|
renderer.Option
|
|
// SetHighlightingOption sets given option to the extension.
|
|
SetHighlightingOption(*Config)
|
|
}
|
|
|
|
type withHTMLOptions struct {
|
|
value []html.Option
|
|
}
|
|
|
|
func (o *withHTMLOptions) SetConfig(c *renderer.Config) {
|
|
if o.value != nil {
|
|
for _, v := range o.value {
|
|
v.(renderer.Option).SetConfig(c)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (o *withHTMLOptions) SetHighlightingOption(c *Config) {
|
|
if o.value != nil {
|
|
for _, v := range o.value {
|
|
v.SetHTMLOption(&c.Config)
|
|
}
|
|
}
|
|
}
|
|
|
|
// WithHTMLOptions is functional option that wraps goldmark HTMLRenderer options.
|
|
func WithHTMLOptions(opts ...html.Option) Option {
|
|
return &withHTMLOptions{opts}
|
|
}
|
|
|
|
const optStyle renderer.OptionName = "HighlightingStyle"
|
|
|
|
var highlightLinesAttrName = []byte("hl_lines")
|
|
|
|
var styleAttrName = []byte("hl_style")
|
|
var nohlAttrName = []byte("nohl")
|
|
var linenosAttrName = []byte("linenos")
|
|
var linenosTableAttrValue = []byte("table")
|
|
var linenosInlineAttrValue = []byte("inline")
|
|
var linenostartAttrName = []byte("linenostart")
|
|
|
|
type withStyle struct {
|
|
value string
|
|
}
|
|
|
|
func (o *withStyle) SetConfig(c *renderer.Config) {
|
|
c.Options[optStyle] = o.value
|
|
}
|
|
|
|
func (o *withStyle) SetHighlightingOption(c *Config) {
|
|
c.Style = o.value
|
|
}
|
|
|
|
// WithStyle is a functional option that changes highlighting style.
|
|
func WithStyle(style string) Option {
|
|
return &withStyle{style}
|
|
}
|
|
|
|
const optCSSWriter renderer.OptionName = "HighlightingCSSWriter"
|
|
|
|
type withCSSWriter struct {
|
|
value io.Writer
|
|
}
|
|
|
|
func (o *withCSSWriter) SetConfig(c *renderer.Config) {
|
|
c.Options[optCSSWriter] = o.value
|
|
}
|
|
|
|
func (o *withCSSWriter) SetHighlightingOption(c *Config) {
|
|
c.CSSWriter = o.value
|
|
}
|
|
|
|
// WithCSSWriter is a functional option that sets io.Writer for CSS data.
|
|
func WithCSSWriter(w io.Writer) Option {
|
|
return &withCSSWriter{w}
|
|
}
|
|
|
|
const optGuessLanguage renderer.OptionName = "HighlightingGuessLanguage"
|
|
|
|
type withGuessLanguage struct {
|
|
value bool
|
|
}
|
|
|
|
func (o *withGuessLanguage) SetConfig(c *renderer.Config) {
|
|
c.Options[optGuessLanguage] = o.value
|
|
}
|
|
|
|
func (o *withGuessLanguage) SetHighlightingOption(c *Config) {
|
|
c.GuessLanguage = o.value
|
|
}
|
|
|
|
// WithGuessLanguage is a functional option that toggles language guessing
|
|
// if none provided.
|
|
func WithGuessLanguage(b bool) Option {
|
|
return &withGuessLanguage{value: b}
|
|
}
|
|
|
|
const optWrapperRenderer renderer.OptionName = "HighlightingWrapperRenderer"
|
|
|
|
type withWrapperRenderer struct {
|
|
value WrapperRenderer
|
|
}
|
|
|
|
func (o *withWrapperRenderer) SetConfig(c *renderer.Config) {
|
|
c.Options[optWrapperRenderer] = o.value
|
|
}
|
|
|
|
func (o *withWrapperRenderer) SetHighlightingOption(c *Config) {
|
|
c.WrapperRenderer = o.value
|
|
}
|
|
|
|
// WithWrapperRenderer is a functional option that sets WrapperRenderer that
|
|
// renders wrapper elements like div, pre, etc.
|
|
func WithWrapperRenderer(w WrapperRenderer) Option {
|
|
return &withWrapperRenderer{w}
|
|
}
|
|
|
|
const optCodeBlockOptions renderer.OptionName = "HighlightingCodeBlockOptions"
|
|
|
|
type withCodeBlockOptions struct {
|
|
value CodeBlockOptions
|
|
}
|
|
|
|
func (o *withCodeBlockOptions) SetConfig(c *renderer.Config) {
|
|
c.Options[optWrapperRenderer] = o.value
|
|
}
|
|
|
|
func (o *withCodeBlockOptions) SetHighlightingOption(c *Config) {
|
|
c.CodeBlockOptions = o.value
|
|
}
|
|
|
|
// WithCodeBlockOptions is a functional option that sets CodeBlockOptions that
|
|
// allows setting Chroma options per code block.
|
|
func WithCodeBlockOptions(c CodeBlockOptions) Option {
|
|
return &withCodeBlockOptions{value: c}
|
|
}
|
|
|
|
const optFormatOptions renderer.OptionName = "HighlightingFormatOptions"
|
|
|
|
type withFormatOptions struct {
|
|
value []chromahtml.Option
|
|
}
|
|
|
|
func (o *withFormatOptions) SetConfig(c *renderer.Config) {
|
|
if _, ok := c.Options[optFormatOptions]; !ok {
|
|
c.Options[optFormatOptions] = []chromahtml.Option{}
|
|
}
|
|
c.Options[optStyle] = append(c.Options[optFormatOptions].([]chromahtml.Option), o.value...)
|
|
}
|
|
|
|
func (o *withFormatOptions) SetHighlightingOption(c *Config) {
|
|
c.FormatOptions = append(c.FormatOptions, o.value...)
|
|
}
|
|
|
|
// WithFormatOptions is a functional option that wraps chroma HTML formatter options.
|
|
func WithFormatOptions(opts ...chromahtml.Option) Option {
|
|
return &withFormatOptions{opts}
|
|
}
|
|
|
|
// HTMLRenderer struct is a renderer.NodeRenderer implementation for the extension.
|
|
type HTMLRenderer struct {
|
|
Config
|
|
}
|
|
|
|
// NewHTMLRenderer builds a new HTMLRenderer with given options and returns it.
|
|
func NewHTMLRenderer(opts ...Option) renderer.NodeRenderer {
|
|
r := &HTMLRenderer{
|
|
Config: NewConfig(),
|
|
}
|
|
for _, opt := range opts {
|
|
opt.SetHighlightingOption(&r.Config)
|
|
}
|
|
return r
|
|
}
|
|
|
|
// RegisterFuncs implements NodeRenderer.RegisterFuncs.
|
|
func (r *HTMLRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
|
|
reg.Register(ast.KindFencedCodeBlock, r.renderFencedCodeBlock)
|
|
}
|
|
|
|
func getAttributes(node *ast.FencedCodeBlock, infostr []byte) ImmutableAttributes {
|
|
if node.Attributes() != nil {
|
|
return &immutableAttributes{node}
|
|
}
|
|
if infostr != nil {
|
|
attrStartIdx := -1
|
|
|
|
for idx, char := range infostr {
|
|
if char == '{' {
|
|
attrStartIdx = idx
|
|
break
|
|
}
|
|
}
|
|
if attrStartIdx > 0 {
|
|
n := ast.NewTextBlock() // dummy node for storing attributes
|
|
attrStr := infostr[attrStartIdx:]
|
|
if attrs, hasAttr := parser.ParseAttributes(text.NewReader(attrStr)); hasAttr {
|
|
for _, attr := range attrs {
|
|
n.SetAttribute(attr.Name, attr.Value)
|
|
}
|
|
return &immutableAttributes{n}
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (r *HTMLRenderer) renderFencedCodeBlock(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
|
|
n := node.(*ast.FencedCodeBlock)
|
|
if !entering {
|
|
return ast.WalkContinue, nil
|
|
}
|
|
language := n.Language(source)
|
|
|
|
chromaFormatterOptions := make([]chromahtml.Option, len(r.FormatOptions))
|
|
copy(chromaFormatterOptions, r.FormatOptions)
|
|
style := styles.Get(r.Style)
|
|
nohl := false
|
|
|
|
var info []byte
|
|
if n.Info != nil {
|
|
info = n.Info.Segment.Value(source)
|
|
}
|
|
attrs := getAttributes(n, info)
|
|
if attrs != nil {
|
|
baseLineNumber := 1
|
|
if linenostartAttr, ok := attrs.Get(linenostartAttrName); ok {
|
|
baseLineNumber = int(linenostartAttr.(float64))
|
|
chromaFormatterOptions = append(chromaFormatterOptions, chromahtml.BaseLineNumber(baseLineNumber))
|
|
}
|
|
if linesAttr, hasLinesAttr := attrs.Get(highlightLinesAttrName); hasLinesAttr {
|
|
if lines, ok := linesAttr.([]interface{}); ok {
|
|
var hlRanges [][2]int
|
|
for _, l := range lines {
|
|
if ln, ok := l.(float64); ok {
|
|
hlRanges = append(hlRanges, [2]int{int(ln) + baseLineNumber - 1, int(ln) + baseLineNumber - 1})
|
|
}
|
|
if rng, ok := l.([]uint8); ok {
|
|
slices := strings.Split(string([]byte(rng)), "-")
|
|
lhs, err := strconv.Atoi(slices[0])
|
|
if err != nil {
|
|
continue
|
|
}
|
|
rhs := lhs
|
|
if len(slices) > 1 {
|
|
rhs, err = strconv.Atoi(slices[1])
|
|
if err != nil {
|
|
continue
|
|
}
|
|
}
|
|
hlRanges = append(hlRanges, [2]int{lhs + baseLineNumber - 1, rhs + baseLineNumber - 1})
|
|
}
|
|
}
|
|
chromaFormatterOptions = append(chromaFormatterOptions, chromahtml.HighlightLines(hlRanges))
|
|
}
|
|
}
|
|
if styleAttr, hasStyleAttr := attrs.Get(styleAttrName); hasStyleAttr {
|
|
styleStr := string([]byte(styleAttr.([]uint8)))
|
|
style = styles.Get(styleStr)
|
|
}
|
|
if _, hasNohlAttr := attrs.Get(nohlAttrName); hasNohlAttr {
|
|
nohl = true
|
|
}
|
|
|
|
if linenosAttr, ok := attrs.Get(linenosAttrName); ok {
|
|
switch v := linenosAttr.(type) {
|
|
case bool:
|
|
chromaFormatterOptions = append(chromaFormatterOptions, chromahtml.WithLineNumbers(v))
|
|
case []uint8:
|
|
if v != nil {
|
|
chromaFormatterOptions = append(chromaFormatterOptions, chromahtml.WithLineNumbers(true))
|
|
}
|
|
if bytes.Equal(v, linenosTableAttrValue) {
|
|
chromaFormatterOptions = append(chromaFormatterOptions, chromahtml.LineNumbersInTable(true))
|
|
} else if bytes.Equal(v, linenosInlineAttrValue) {
|
|
chromaFormatterOptions = append(chromaFormatterOptions, chromahtml.LineNumbersInTable(false))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
var lexer chroma.Lexer
|
|
if language != nil {
|
|
lexer = lexers.Get(string(language))
|
|
}
|
|
if !nohl && (lexer != nil || r.GuessLanguage) {
|
|
if style == nil {
|
|
style = styles.Fallback
|
|
}
|
|
var buffer bytes.Buffer
|
|
l := n.Lines().Len()
|
|
for i := 0; i < l; i++ {
|
|
line := n.Lines().At(i)
|
|
buffer.Write(line.Value(source))
|
|
}
|
|
|
|
if lexer == nil {
|
|
lexer = lexers.Analyse(buffer.String())
|
|
if lexer == nil {
|
|
lexer = lexers.Fallback
|
|
}
|
|
language = []byte(strings.ToLower(lexer.Config().Name))
|
|
}
|
|
lexer = chroma.Coalesce(lexer)
|
|
|
|
iterator, err := lexer.Tokenise(nil, buffer.String())
|
|
if err == nil {
|
|
c := newCodeBlockContext(language, true, attrs)
|
|
|
|
if r.CodeBlockOptions != nil {
|
|
chromaFormatterOptions = append(chromaFormatterOptions, r.CodeBlockOptions(c)...)
|
|
}
|
|
formatter := chromahtml.New(chromaFormatterOptions...)
|
|
if r.WrapperRenderer != nil {
|
|
r.WrapperRenderer(w, c, true)
|
|
}
|
|
_ = formatter.Format(w, style, iterator) == nil
|
|
if r.WrapperRenderer != nil {
|
|
r.WrapperRenderer(w, c, false)
|
|
}
|
|
if r.CSSWriter != nil {
|
|
_ = formatter.WriteCSS(r.CSSWriter, style)
|
|
}
|
|
return ast.WalkContinue, nil
|
|
}
|
|
}
|
|
|
|
var c CodeBlockContext
|
|
if r.WrapperRenderer != nil {
|
|
c = newCodeBlockContext(language, false, attrs)
|
|
r.WrapperRenderer(w, c, true)
|
|
} else {
|
|
_, _ = w.WriteString("<pre><code")
|
|
language := n.Language(source)
|
|
if language != nil {
|
|
_, _ = w.WriteString(" class=\"language-")
|
|
r.Writer.Write(w, language)
|
|
_, _ = w.WriteString("\"")
|
|
}
|
|
_ = w.WriteByte('>')
|
|
}
|
|
l := n.Lines().Len()
|
|
for i := 0; i < l; i++ {
|
|
line := n.Lines().At(i)
|
|
r.Writer.RawWrite(w, line.Value(source))
|
|
}
|
|
if r.WrapperRenderer != nil {
|
|
r.WrapperRenderer(w, c, false)
|
|
} else {
|
|
_, _ = w.WriteString("</code></pre>\n")
|
|
}
|
|
return ast.WalkContinue, nil
|
|
}
|
|
|
|
type highlighting struct {
|
|
options []Option
|
|
}
|
|
|
|
// Highlighting is a goldmark.Extender implementation.
|
|
var Highlighting = &highlighting{
|
|
options: []Option{},
|
|
}
|
|
|
|
// NewHighlighting returns a new extension with given options.
|
|
func NewHighlighting(opts ...Option) goldmark.Extender {
|
|
return &highlighting{
|
|
options: opts,
|
|
}
|
|
}
|
|
|
|
// Extend implements goldmark.Extender.
|
|
func (e *highlighting) Extend(m goldmark.Markdown) {
|
|
m.Renderer().AddOptions(renderer.WithNodeRenderers(
|
|
util.Prioritized(NewHTMLRenderer(e.options...), 200),
|
|
))
|
|
}
|