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// Copyright 2019 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package goldmark converts Markdown to HTML using Goldmark.
package goldmark
import (
"bytes"
"github.com/gohugoio/hugo/identity"
"github.com/gohugoio/hugo/markup/goldmark/codeblocks"
"github.com/gohugoio/hugo/markup/goldmark/images"
"github.com/gohugoio/hugo/markup/goldmark/internal/extensions/attributes"
"github.com/gohugoio/hugo/markup/goldmark/internal/render"
"github.com/gohugoio/hugo/markup/converter"
"github.com/gohugoio/hugo/markup/tableofcontents"
"github.com/yuin/goldmark"
"github.com/yuin/goldmark/extension"
"github.com/yuin/goldmark/parser"
"github.com/yuin/goldmark/renderer"
"github.com/yuin/goldmark/renderer/html"
"github.com/yuin/goldmark/text"
)
const (
internalAttrPrefix = "_h__"
)
// Provider is the package entry point.
var Provider converter.ProviderProvider = provide{}
type provide struct{}
func (p provide) New(cfg converter.ProviderConfig) (converter.Provider, error) {
md := newMarkdown(cfg)
return converter.NewProvider("goldmark", func(ctx converter.DocumentContext) (converter.Converter, error) {
return &goldmarkConverter{
ctx: ctx,
cfg: cfg,
md: md,
sanitizeAnchorName: func(s string) string {
return sanitizeAnchorNameString(s, cfg.MarkupConfig.Goldmark.Parser.AutoHeadingIDType)
},
}, nil
}), nil
}
var _ converter.AnchorNameSanitizer = (*goldmarkConverter)(nil)
type goldmarkConverter struct {
md goldmark.Markdown
ctx converter.DocumentContext
cfg converter.ProviderConfig
sanitizeAnchorName func(s string) string
}
func (c *goldmarkConverter) SanitizeAnchorName(s string) string {
return c.sanitizeAnchorName(s)
}
func newMarkdown(pcfg converter.ProviderConfig) goldmark.Markdown {
mcfg := pcfg.MarkupConfig
cfg := pcfg.MarkupConfig.Goldmark
var rendererOptions []renderer.Option
if cfg.Renderer.HardWraps {
rendererOptions = append(rendererOptions, html.WithHardWraps())
}
if cfg.Renderer.XHTML {
rendererOptions = append(rendererOptions, html.WithXHTML())
}
if cfg.Renderer.Unsafe {
rendererOptions = append(rendererOptions, html.WithUnsafe())
}
var (
extensions = []goldmark.Extender{
newLinks(cfg),
newTocExtension(rendererOptions),
}
parserOptions []parser.Option
)
extensions = append(extensions, images.New(cfg.Parser.WrapStandAloneImageWithinParagraph))
if mcfg.Highlight.CodeFences {
extensions = append(extensions, codeblocks.New())
}
if cfg.Extensions.Table {
extensions = append(extensions, extension.Table)
}
if cfg.Extensions.Strikethrough {
extensions = append(extensions, extension.Strikethrough)
}
if cfg.Extensions.Linkify {
extensions = append(extensions, extension.Linkify)
}
if cfg.Extensions.TaskList {
extensions = append(extensions, extension.TaskList)
}
if cfg.Extensions.Typographer {
extensions = append(extensions, extension.Typographer)
}
if cfg.Extensions.DefinitionList {
extensions = append(extensions, extension.DefinitionList)
}
if cfg.Extensions.Footnote {
extensions = append(extensions, extension.Footnote)
}
if cfg.Parser.AutoHeadingID {
parserOptions = append(parserOptions, parser.WithAutoHeadingID())
}
if cfg.Parser.Attribute.Title {
parserOptions = append(parserOptions, parser.WithAttribute())
}
if cfg.Parser.Attribute.Block {
extensions = append(extensions, attributes.New())
}
md := goldmark.New(
goldmark.WithExtensions(
extensions...,
),
goldmark.WithParserOptions(
parserOptions...,
),
goldmark.WithRendererOptions(
rendererOptions...,
),
)
return md
}
var _ identity.IdentitiesProvider = (*converterResult)(nil)
type converterResult struct {
converter.Result
toc *tableofcontents.Fragments
ids identity.Identities
}
func (c converterResult) TableOfContents() *tableofcontents.Fragments {
return c.toc
}
func (c converterResult) GetIdentities() identity.Identities {
return c.ids
}
var converterIdentity = identity.KeyValueIdentity{Key: "goldmark", Value: "converter"}
func (c *goldmarkConverter) Convert(ctx converter.RenderContext) (result converter.Result, err error) {
buf := &render.BufWriter{Buffer: &bytes.Buffer{}}
result = buf
pctx := c.newParserContext(ctx)
reader := text.NewReader(ctx.Src)
doc := c.md.Parser().Parse(
reader,
parser.WithContext(pctx),
)
rcx := &render.RenderContextDataHolder{
Rctx: ctx,
Dctx: c.ctx,
IDs: identity.NewManager(converterIdentity),
}
w := &render.Context{
BufWriter: buf,
ContextData: rcx,
}
if err := c.md.Renderer().Render(w, ctx.Src, doc); err != nil {
return nil, err
}
return converterResult{
Result: buf,
ids: rcx.IDs.GetIdentities(),
toc: pctx.TableOfContents(),
}, nil
}
var featureSet = map[identity.Identity]bool{
converter.FeatureRenderHooks: true,
}
func (c *goldmarkConverter) Supports(feature identity.Identity) bool {
return featureSet[feature.GetIdentity()]
}
func (c *goldmarkConverter) newParserContext(rctx converter.RenderContext) *parserContext {
ctx := parser.NewContext(parser.WithIDs(newIDFactory(c.cfg.MarkupConfig.Goldmark.Parser.AutoHeadingIDType)))
ctx.Set(tocEnableKey, rctx.RenderTOC)
return &parserContext{
Context: ctx,
}
}
type parserContext struct {
parser.Context
}
func (p *parserContext) TableOfContents() *tableofcontents.Fragments {
if v := p.Get(tocResultKey); v != nil {
return v.(*tableofcontents.Fragments)
}
return nil
}
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