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gitea/modules/markup/markdown/math/block_renderer.go
2024-12-13 01:45:32 -05:00

60 lines
2.0 KiB
Go

// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package math
import (
"code.gitea.io/gitea/modules/markup/internal"
giteaUtil "code.gitea.io/gitea/modules/util"
gast "github.com/yuin/goldmark/ast"
"github.com/yuin/goldmark/renderer"
"github.com/yuin/goldmark/util"
)
// Block render output:
// <pre class="code-block is-loading"><code class="language-math display">...</code></pre>
//
// Keep in mind that there is another "code block" render in "func (r *GlodmarkRender) highlightingRenderer"
// "highlightingRenderer" outputs the math block with extra "chroma" class:
// <pre class="code-block is-loading"><code class="chroma language-math display">...</code></pre>
//
// Special classes:
// * "is-loading": show a loading indicator
// * "display": used by JS to decide to render as a block, otherwise render as inline
// BlockRenderer represents a renderer for math Blocks
type BlockRenderer struct {
renderInternal *internal.RenderInternal
}
// NewBlockRenderer creates a new renderer for math Blocks
func NewBlockRenderer(renderInternal *internal.RenderInternal) renderer.NodeRenderer {
return &BlockRenderer{renderInternal: renderInternal}
}
// RegisterFuncs registers the renderer for math Blocks
func (r *BlockRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
reg.Register(KindBlock, r.renderBlock)
}
func (r *BlockRenderer) writeLines(w util.BufWriter, source []byte, n gast.Node) {
l := n.Lines().Len()
for i := 0; i < l; i++ {
line := n.Lines().At(i)
_, _ = w.Write(util.EscapeHTML(line.Value(source)))
}
}
func (r *BlockRenderer) renderBlock(w util.BufWriter, source []byte, node gast.Node, entering bool) (gast.WalkStatus, error) {
n := node.(*Block)
if entering {
code := giteaUtil.Iif(n.Inline, "", `<pre class="code-block is-loading">`) + `<code class="language-math display">`
_ = r.renderInternal.FormatWithSafeAttrs(w, code)
r.writeLines(w, source, n)
} else {
_, _ = w.WriteString(`</code>` + giteaUtil.Iif(n.Inline, "", `</pre>`) + "\n")
}
return gast.WalkContinue, nil
}