Initial commit, source code of Gitea 1.23.1

modules/markup/markdown/math/block_renderer.go

@@ -0,0 +1,59 @@
+// 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
+}