mirror of https://github.com/gohugoio/hugo
76 lines
2.0 KiB
Go
76 lines
2.0 KiB
Go
package images
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import (
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"github.com/yuin/goldmark"
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"github.com/yuin/goldmark/ast"
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"github.com/yuin/goldmark/parser"
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"github.com/yuin/goldmark/text"
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"github.com/yuin/goldmark/util"
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)
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type (
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imagesExtension struct {
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wrapStandAloneImageWithinParagraph bool
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}
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)
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const (
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// Used to signal to the rendering step that an image is used in a block context.
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// Dont's change this; the prefix must match the internalAttrPrefix in the root goldmark package.
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AttrIsBlock = "_h__isBlock"
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AttrOrdinal = "_h__ordinal"
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)
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func New(wrapStandAloneImageWithinParagraph bool) goldmark.Extender {
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return &imagesExtension{wrapStandAloneImageWithinParagraph: wrapStandAloneImageWithinParagraph}
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}
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func (e *imagesExtension) Extend(m goldmark.Markdown) {
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m.Parser().AddOptions(
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parser.WithASTTransformers(
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util.Prioritized(&Transformer{wrapStandAloneImageWithinParagraph: e.wrapStandAloneImageWithinParagraph}, 300),
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),
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)
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}
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type Transformer struct {
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wrapStandAloneImageWithinParagraph bool
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}
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// Transform transforms the provided Markdown AST.
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func (t *Transformer) Transform(doc *ast.Document, reader text.Reader, pctx parser.Context) {
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var ordinal int
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ast.Walk(doc, func(node ast.Node, enter bool) (ast.WalkStatus, error) {
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if !enter {
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return ast.WalkContinue, nil
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}
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if n, ok := node.(*ast.Image); ok {
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parent := n.Parent()
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n.SetAttributeString(AttrOrdinal, ordinal)
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ordinal++
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if !t.wrapStandAloneImageWithinParagraph {
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isBlock := parent.ChildCount() == 1
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if isBlock {
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n.SetAttributeString(AttrIsBlock, true)
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}
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if isBlock && parent.Kind() == ast.KindParagraph {
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for _, attr := range parent.Attributes() {
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// Transfer any attribute set down to the image.
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// Image elements does not support attributes on its own,
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// so it's safe to just set without checking first.
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n.SetAttribute(attr.Name, attr.Value)
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}
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grandParent := parent.Parent()
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grandParent.ReplaceChild(grandParent, parent, n)
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}
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}
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}
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return ast.WalkContinue, nil
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})
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}
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