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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 mmark converts Markdown to HTML using MMark v1.
package mmark
import (
"github.com/gohugoio/hugo/identity"
"github.com/gohugoio/hugo/markup/blackfriday/blackfriday_config"
"github.com/gohugoio/hugo/markup/converter"
"github.com/miekg/mmark"
)
// Provider is the package entry point.
var Provider converter.ProviderProvider = provider{}
type provider struct {
}
func (p provider) New(cfg converter.ProviderConfig) (converter.Provider, error) {
defaultBlackFriday := cfg.MarkupConfig.BlackFriday
defaultExtensions := getMmarkExtensions(defaultBlackFriday)
return converter.NewProvider("mmark", func(ctx converter.DocumentContext) (converter.Converter, error) {
b := defaultBlackFriday
extensions := defaultExtensions
if ctx.ConfigOverrides != nil {
var err error
b, err = blackfriday_config.UpdateConfig(b, ctx.ConfigOverrides)
if err != nil {
return nil, err
}
extensions = getMmarkExtensions(b)
}
return &mmarkConverter{
ctx: ctx,
b: b,
extensions: extensions,
cfg: cfg,
}, nil
}), nil
}
type mmarkConverter struct {
ctx converter.DocumentContext
extensions int
b blackfriday_config.Config
cfg converter.ProviderConfig
}
func (c *mmarkConverter) Convert(ctx converter.RenderContext) (converter.Result, error) {
r := getHTMLRenderer(c.ctx, c.b, c.cfg)
return mmark.Parse(ctx.Src, r, c.extensions), nil
}
func (c *mmarkConverter) Supports(feature identity.Identity) bool {
return false
}
func getHTMLRenderer(
ctx converter.DocumentContext,
cfg blackfriday_config.Config,
pcfg converter.ProviderConfig) mmark.Renderer {
var (
flags int
documentID string
)
documentID = ctx.DocumentID
renderParameters := mmark.HtmlRendererParameters{
FootnoteAnchorPrefix: cfg.FootnoteAnchorPrefix,
FootnoteReturnLinkContents: cfg.FootnoteReturnLinkContents,
}
if documentID != "" && !cfg.PlainIDAnchors {
renderParameters.FootnoteAnchorPrefix = documentID + ":" + renderParameters.FootnoteAnchorPrefix
}
htmlFlags := flags
htmlFlags |= mmark.HTML_FOOTNOTE_RETURN_LINKS
return &mmarkRenderer{
BlackfridayConfig: cfg,
Config: pcfg,
Renderer: mmark.HtmlRendererWithParameters(htmlFlags, "", "", renderParameters),
}
}
func getMmarkExtensions(cfg blackfriday_config.Config) int {
flags := 0
flags |= mmark.EXTENSION_TABLES
flags |= mmark.EXTENSION_FENCED_CODE
flags |= mmark.EXTENSION_AUTOLINK
flags |= mmark.EXTENSION_SPACE_HEADERS
flags |= mmark.EXTENSION_CITATION
flags |= mmark.EXTENSION_TITLEBLOCK_TOML
flags |= mmark.EXTENSION_HEADER_IDS
flags |= mmark.EXTENSION_AUTO_HEADER_IDS
flags |= mmark.EXTENSION_UNIQUE_HEADER_IDS
flags |= mmark.EXTENSION_FOOTNOTES
flags |= mmark.EXTENSION_SHORT_REF
flags |= mmark.EXTENSION_NO_EMPTY_LINE_BEFORE_BLOCK
flags |= mmark.EXTENSION_INCLUDE
for _, extension := range cfg.Extensions {
if flag, ok := mmarkExtensionMap[extension]; ok {
flags |= flag
}
}
return flags
}
var mmarkExtensionMap = map[string]int{
"tables": mmark.EXTENSION_TABLES,
"fencedCode": mmark.EXTENSION_FENCED_CODE,
"autolink": mmark.EXTENSION_AUTOLINK,
"laxHtmlBlocks": mmark.EXTENSION_LAX_HTML_BLOCKS,
"spaceHeaders": mmark.EXTENSION_SPACE_HEADERS,
"hardLineBreak": mmark.EXTENSION_HARD_LINE_BREAK,
"footnotes": mmark.EXTENSION_FOOTNOTES,
"noEmptyLineBeforeBlock": mmark.EXTENSION_NO_EMPTY_LINE_BEFORE_BLOCK,
"headerIds": mmark.EXTENSION_HEADER_IDS,
"autoHeaderIds": mmark.EXTENSION_AUTO_HEADER_IDS,
}
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