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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,247 @@ | ||
| // 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 | ||
| } | ||
| sourceRef := make([]byte, stop-start) | ||
| copy(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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