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// Copyright 2024 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 blockquotes
import (
"regexp"
"strings"
"sync"
"github.com/gohugoio/hugo/common/herrors"
htext "github.com/gohugoio/hugo/common/text"
"github.com/gohugoio/hugo/common/types/hstring"
"github.com/gohugoio/hugo/markup/converter/hooks"
"github.com/gohugoio/hugo/markup/goldmark/internal/render"
"github.com/gohugoio/hugo/markup/internal/attributes"
"github.com/yuin/goldmark"
"github.com/yuin/goldmark/ast"
"github.com/yuin/goldmark/renderer"
"github.com/yuin/goldmark/renderer/html"
"github.com/yuin/goldmark/util"
)
type (
blockquotesExtension struct{}
htmlRenderer struct{}
)
func New() goldmark.Extender {
return &blockquotesExtension{}
}
func (e *blockquotesExtension) Extend(m goldmark.Markdown) {
m.Renderer().AddOptions(renderer.WithNodeRenderers(
util.Prioritized(newHTMLRenderer(), 100),
))
}
func newHTMLRenderer() renderer.NodeRenderer {
r := &htmlRenderer{}
return r
}
func (r *htmlRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
reg.Register(ast.KindBlockquote, r.renderBlockquote)
}
const (
typeRegular = "regular"
typeAlert = "alert"
)
func (r *htmlRenderer) renderBlockquote(w util.BufWriter, src []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
ctx := w.(*render.Context)
n := node.(*ast.Blockquote)
if entering {
// Store the current pos so we can capture the rendered text.
ctx.PushPos(ctx.Buffer.Len())
return ast.WalkContinue, nil
}
pos := ctx.PopPos()
text := ctx.Buffer.Bytes()[pos:]
ctx.Buffer.Truncate(pos)
// Extract a source sample to use for position information.
nn := n.FirstChild()
var start, stop int
for i := 0; i < nn.Lines().Len() && i < 2; i++ {
line := nn.Lines().At(i)
if i == 0 {
start = line.Start
}
stop = line.Stop
}
// We do not mutate the source, so this is safe.
sourceRef := src[start:stop]
ordinal := ctx.GetAndIncrementOrdinal(ast.KindBlockquote)
texts := string(text)
typ := typeRegular
alertType := resolveGitHubAlert(texts)
if alertType != "" {
typ = typeAlert
}
renderer := ctx.RenderContext().GetRenderer(hooks.BlockquoteRendererType, typ)
if renderer == nil {
return r.renderBlockquoteDefault(w, n, texts)
}
if typ == typeAlert {
// Trim preamble: <p>[!NOTE]<br>\n but preserve leading paragraph.
// We could possibly complicate this by moving this to the parser, but
// keep it simple for now.
texts = "<p>" + texts[strings.Index(texts, "\n")+1:]
}
bqctx := &blockquoteContext{
page: ctx.DocumentContext().Document,
pageInner: r.getPageInner(ctx),
typ: typ,
alertType: alertType,
text: hstring.RenderedString(texts),
sourceRef: sourceRef,
ordinal: ordinal,
AttributesHolder: attributes.New(n.Attributes(), attributes.AttributesOwnerGeneral),
}
bqctx.createPos = func() htext.Position {
if resolver, ok := renderer.(hooks.ElementPositionResolver); ok {
return resolver.ResolvePosition(bqctx)
}
return htext.Position{
Filename: ctx.DocumentContext().Filename,
LineNumber: 1,
ColumnNumber: 1,
}
}
cr := renderer.(hooks.BlockquoteRenderer)
err := cr.RenderBlockquote(
ctx.RenderContext().Ctx,
w,
bqctx,
)
if err != nil {
return ast.WalkContinue, herrors.NewFileErrorFromPos(err, bqctx.createPos())
}
return ast.WalkContinue, nil
}
func (r *htmlRenderer) getPageInner(rctx *render.Context) any {
pid := rctx.PeekPid()
if pid > 0 {
if lookup := rctx.DocumentContext().DocumentLookup; lookup != nil {
if v := rctx.DocumentContext().DocumentLookup(pid); v != nil {
return v
}
}
}
return rctx.DocumentContext().Document
}
// Code borrowed from goldmark's html renderer.
func (r *htmlRenderer) renderBlockquoteDefault(
w util.BufWriter, n ast.Node, text string,
) (ast.WalkStatus, error) {
if n.Attributes() != nil {
_, _ = w.WriteString("<blockquote")
html.RenderAttributes(w, n, html.BlockquoteAttributeFilter)
_ = w.WriteByte('>')
} else {
_, _ = w.WriteString("<blockquote>\n")
}
_, _ = w.WriteString(text)
_, _ = w.WriteString("</blockquote>\n")
return ast.WalkContinue, nil
}
type blockquoteContext struct {
page any
pageInner any
text hstring.RenderedString
typ string
sourceRef []byte
alertType string
ordinal int
// This is only used in error situations and is expensive to create,
// so delay creation until needed.
pos htext.Position
posInit sync.Once
createPos func() htext.Position
*attributes.AttributesHolder
}
func (c *blockquoteContext) Type() string {
return c.typ
}
func (c *blockquoteContext) AlertType() string {
return c.alertType
}
func (c *blockquoteContext) Page() any {
return c.page
}
func (c *blockquoteContext) PageInner() any {
return c.pageInner
}
func (c *blockquoteContext) Text() hstring.RenderedString {
return c.text
}
func (c *blockquoteContext) Ordinal() int {
return c.ordinal
}
func (c *blockquoteContext) Position() htext.Position {
c.posInit.Do(func() {
c.pos = c.createPos()
})
return c.pos
}
func (c *blockquoteContext) PositionerSourceTarget() []byte {
return c.sourceRef
}
var _ hooks.PositionerSourceTargetProvider = (*blockquoteContext)(nil)
// https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#alerts
// Five types:
// [!NOTE], [!TIP], [!WARNING], [!IMPORTANT], [!CAUTION]
var gitHubAlertRe = regexp.MustCompile(`^<p>\[!(NOTE|TIP|WARNING|IMPORTANT|CAUTION)\]`)
// resolveGitHubAlert returns one of note, tip, warning, important or caution.
// An empty string if no match.
func resolveGitHubAlert(s string) string {
m := gitHubAlertRe.FindStringSubmatch(s)
if len(m) == 2 {
return strings.ToLower(m[1])
}
return ""
}
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