mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-21 20:46:30 -05:00
304 lines
7.2 KiB
Go
304 lines
7.2 KiB
Go
// Copyright 2019 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package highlight
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import (
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"fmt"
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gohtml "html"
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"html/template"
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"io"
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"strings"
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"github.com/alecthomas/chroma"
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"github.com/alecthomas/chroma/formatters/html"
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"github.com/alecthomas/chroma/lexers"
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"github.com/alecthomas/chroma/styles"
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"github.com/gohugoio/hugo/common/hugio"
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"github.com/gohugoio/hugo/common/text"
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"github.com/gohugoio/hugo/identity"
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"github.com/gohugoio/hugo/markup/converter/hooks"
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"github.com/gohugoio/hugo/markup/internal/attributes"
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)
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// Markdown attributes used by the Chroma hightlighter.
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var chromaHightlightProcessingAttributes = map[string]bool{
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"anchorLineNos": true,
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"guessSyntax": true,
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"hl_Lines": true,
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"lineAnchors": true,
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"lineNos": true,
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"lineNoStart": true,
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"lineNumbersInTable": true,
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"noClasses": true,
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"style": true,
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"tabWidth": true,
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}
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func init() {
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for k, v := range chromaHightlightProcessingAttributes {
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chromaHightlightProcessingAttributes[strings.ToLower(k)] = v
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}
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}
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func New(cfg Config) Highlighter {
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return chromaHighlighter{
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cfg: cfg,
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}
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}
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type Highlighter interface {
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Highlight(code, lang string, opts interface{}) (string, error)
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HighlightCodeBlock(ctx hooks.CodeblockContext, opts interface{}) (HightlightResult, error)
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hooks.CodeBlockRenderer
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hooks.IsDefaultCodeBlockRendererProvider
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}
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type chromaHighlighter struct {
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cfg Config
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}
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func (h chromaHighlighter) Highlight(code, lang string, opts interface{}) (string, error) {
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cfg := h.cfg
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if err := applyOptions(opts, &cfg); err != nil {
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return "", err
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}
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var b strings.Builder
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if _, _, err := highlight(&b, code, lang, nil, cfg); err != nil {
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return "", err
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}
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return b.String(), nil
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}
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func (h chromaHighlighter) HighlightCodeBlock(ctx hooks.CodeblockContext, opts interface{}) (HightlightResult, error) {
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cfg := h.cfg
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var b strings.Builder
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attributes := ctx.(hooks.AttributesOptionsSliceProvider).AttributesSlice()
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options := ctx.Options()
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if err := applyOptionsFromMap(options, &cfg); err != nil {
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return HightlightResult{}, err
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}
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// Apply these last so the user can override them.
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if err := applyOptions(opts, &cfg); err != nil {
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return HightlightResult{}, err
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}
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if err := applyOptionsFromCodeBlockContext(ctx, &cfg); err != nil {
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return HightlightResult{}, err
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}
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low, high, err := highlight(&b, ctx.Inner(), ctx.Type(), attributes, cfg)
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if err != nil {
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return HightlightResult{}, err
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}
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return HightlightResult{
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highlighted: template.HTML(b.String()),
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innerLow: low,
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innerHigh: high,
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}, nil
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}
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func (h chromaHighlighter) RenderCodeblock(w hugio.FlexiWriter, ctx hooks.CodeblockContext) error {
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cfg := h.cfg
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attributes := ctx.(hooks.AttributesOptionsSliceProvider).AttributesSlice()
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if err := applyOptionsFromMap(ctx.Options(), &cfg); err != nil {
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return err
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}
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if err := applyOptionsFromCodeBlockContext(ctx, &cfg); err != nil {
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return err
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}
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code := text.Puts(ctx.Inner())
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_, _, err := highlight(w, code, ctx.Type(), attributes, cfg)
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return err
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}
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func (h chromaHighlighter) IsDefaultCodeBlockRenderer() bool {
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return true
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}
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var id = identity.NewPathIdentity("chroma", "highlight")
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func (h chromaHighlighter) GetIdentity() identity.Identity {
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return id
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}
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type HightlightResult struct {
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innerLow int
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innerHigh int
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highlighted template.HTML
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}
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func (h HightlightResult) Wrapped() template.HTML {
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return h.highlighted
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}
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func (h HightlightResult) Inner() template.HTML {
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return h.highlighted[h.innerLow:h.innerHigh]
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}
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func highlight(fw hugio.FlexiWriter, code, lang string, attributes []attributes.Attribute, cfg Config) (int, int, error) {
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var low, high int
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var lexer chroma.Lexer
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if lang != "" {
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lexer = lexers.Get(lang)
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}
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if lexer == nil && (cfg.GuessSyntax && !cfg.NoHl) {
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lexer = lexers.Analyse(code)
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if lexer == nil {
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lexer = lexers.Fallback
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}
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lang = strings.ToLower(lexer.Config().Name)
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}
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w := &byteCountFlexiWriter{delegate: fw}
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if lexer == nil {
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wrapper := getPreWrapper(lang, w)
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fmt.Fprint(w, wrapper.Start(true, ""))
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fmt.Fprint(w, gohtml.EscapeString(code))
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fmt.Fprint(w, wrapper.End(true))
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return low, high, nil
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}
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style := styles.Get(cfg.Style)
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if style == nil {
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style = styles.Fallback
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}
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lexer = chroma.Coalesce(lexer)
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iterator, err := lexer.Tokenise(nil, code)
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if err != nil {
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return 0, 0, err
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}
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options := cfg.ToHTMLOptions()
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preWrapper := getPreWrapper(lang, w)
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options = append(options, html.WithPreWrapper(preWrapper))
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formatter := html.New(options...)
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writeDivStart(w, attributes)
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if err := formatter.Format(w, style, iterator); err != nil {
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return 0, 0, err
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}
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writeDivEnd(w)
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return preWrapper.low, preWrapper.high, nil
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}
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func getPreWrapper(language string, writeCounter *byteCountFlexiWriter) *preWrapper {
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return &preWrapper{language: language, writeCounter: writeCounter}
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}
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type preWrapper struct {
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low int
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high int
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writeCounter *byteCountFlexiWriter
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language string
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}
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func (p *preWrapper) Start(code bool, styleAttr string) string {
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var language string
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if code {
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language = p.language
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}
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w := &strings.Builder{}
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WritePreStart(w, language, styleAttr)
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p.low = p.writeCounter.counter + w.Len()
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return w.String()
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}
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func WritePreStart(w io.Writer, language, styleAttr string) {
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fmt.Fprintf(w, `<pre tabindex="0"%s>`, styleAttr)
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fmt.Fprint(w, "<code")
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if language != "" {
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fmt.Fprint(w, ` class="language-`+language+`"`)
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fmt.Fprint(w, ` data-lang="`+language+`"`)
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}
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fmt.Fprint(w, ">")
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}
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const preEnd = "</code></pre>"
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func (p *preWrapper) End(code bool) string {
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p.high = p.writeCounter.counter
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return preEnd
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}
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func WritePreEnd(w io.Writer) {
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fmt.Fprint(w, preEnd)
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}
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func writeDivStart(w hugio.FlexiWriter, attrs []attributes.Attribute) {
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w.WriteString(`<div class="highlight`)
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if attrs != nil {
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for _, attr := range attrs {
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if attr.Name == "class" {
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w.WriteString(" " + attr.ValueString())
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break
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}
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}
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_, _ = w.WriteString("\"")
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attributes.RenderAttributes(w, true, attrs...)
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} else {
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_, _ = w.WriteString("\"")
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}
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w.WriteString(">")
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}
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func writeDivEnd(w hugio.FlexiWriter) {
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w.WriteString("</div>")
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}
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type byteCountFlexiWriter struct {
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delegate hugio.FlexiWriter
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counter int
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}
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func (w *byteCountFlexiWriter) Write(p []byte) (int, error) {
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n, err := w.delegate.Write(p)
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w.counter += n
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return n, err
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}
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func (w *byteCountFlexiWriter) WriteByte(c byte) error {
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w.counter++
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return w.delegate.WriteByte(c)
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}
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func (w *byteCountFlexiWriter) WriteString(s string) (int, error) {
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n, err := w.delegate.WriteString(s)
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w.counter += n
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return n, err
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}
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func (w *byteCountFlexiWriter) WriteRune(r rune) (int, error) {
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n, err := w.delegate.WriteRune(r)
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w.counter += n
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return n, err
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}
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