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126 lines
3.2 KiB
Go
126 lines
3.2 KiB
Go
package attributes
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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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// This extension is based on/inspired by https://github.com/mdigger/goldmark-attributes
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// MIT License
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// Copyright (c) 2019 Dmitry Sedykh
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var (
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kindAttributesBlock = ast.NewNodeKind("AttributesBlock")
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defaultParser = new(attrParser)
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defaultTransformer = new(transformer)
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attributes goldmark.Extender = new(attrExtension)
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)
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func New() goldmark.Extender {
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return attributes
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}
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type attrExtension struct{}
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func (a *attrExtension) Extend(m goldmark.Markdown) {
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m.Parser().AddOptions(
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parser.WithBlockParsers(
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util.Prioritized(defaultParser, 100)),
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parser.WithASTTransformers(
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util.Prioritized(defaultTransformer, 100),
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),
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)
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}
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type attrParser struct{}
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func (a *attrParser) CanAcceptIndentedLine() bool {
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return false
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}
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func (a *attrParser) CanInterruptParagraph() bool {
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return true
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}
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func (a *attrParser) Close(node ast.Node, reader text.Reader, pc parser.Context) {
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}
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func (a *attrParser) Continue(node ast.Node, reader text.Reader, pc parser.Context) parser.State {
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return parser.Close
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}
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func (a *attrParser) Open(parent ast.Node, reader text.Reader, pc parser.Context) (ast.Node, parser.State) {
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if attrs, ok := parser.ParseAttributes(reader); ok {
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// add attributes
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node := &attributesBlock{
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BaseBlock: ast.BaseBlock{},
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}
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for _, attr := range attrs {
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node.SetAttribute(attr.Name, attr.Value)
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}
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return node, parser.NoChildren
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}
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return nil, parser.RequireParagraph
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}
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func (a *attrParser) Trigger() []byte {
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return []byte{'{'}
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}
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type attributesBlock struct {
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ast.BaseBlock
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}
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func (a *attributesBlock) Dump(source []byte, level int) {
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attrs := a.Attributes()
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list := make(map[string]string, len(attrs))
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for _, attr := range attrs {
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var (
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name = util.BytesToReadOnlyString(attr.Name)
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value = util.BytesToReadOnlyString(util.EscapeHTML(attr.Value.([]byte)))
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)
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list[name] = value
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}
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ast.DumpHelper(a, source, level, list, nil)
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}
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func (a *attributesBlock) Kind() ast.NodeKind {
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return kindAttributesBlock
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}
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type transformer struct{}
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func (a *transformer) Transform(node *ast.Document, reader text.Reader, pc parser.Context) {
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attributes := make([]ast.Node, 0, 500)
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ast.Walk(node, func(node ast.Node, entering bool) (ast.WalkStatus, error) {
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if entering && node.Kind() == kindAttributesBlock {
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// Attributes for fenced code blocks are handled in their own extension,
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// but note that we currently only support code block attributes when
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// CodeFences=true.
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if node.PreviousSibling() != nil && node.PreviousSibling().Kind() != ast.KindFencedCodeBlock && !node.HasBlankPreviousLines() {
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attributes = append(attributes, node)
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return ast.WalkSkipChildren, nil
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}
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}
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return ast.WalkContinue, nil
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})
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for _, attr := range attributes {
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if prev := attr.PreviousSibling(); prev != nil &&
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prev.Type() == ast.TypeBlock {
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for _, attr := range attr.Attributes() {
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if _, found := prev.Attribute(attr.Name); !found {
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prev.SetAttribute(attr.Name, attr.Value)
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}
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}
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}
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// remove attributes node
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attr.Parent().RemoveChild(attr.Parent(), attr)
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}
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}
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