add: Add RenderSnippet method to the Renderer interface and Implement…

… it in chartRender & pageRender

render/chart.go

@@ -40,3 +40,29 @@ func (r *chartRender) RenderContent() []byte {
 
 	return pat.ReplaceAll(buf.Bytes(), []byte(""))
 }
+
+func (r *chartRender) RenderSnippet() ChartSnippet {
+	for _, fn := range r.before {
+		fn()
+	}
+
+	elementTpl := MustTemplate(ModChart, []string{templates.BaseTpl, templates.BaseElementTpl})
+
+	var snippet ChartSnippet
+	var elementBuf bytes.Buffer // Buffer to collect template output
+
+	if err := elementTpl.ExecuteTemplate(&elementBuf, ModChart, r.c); err != nil {
+		panic(err)
+	}
+	snippet.Element = string(pat.ReplaceAll(elementBuf.Bytes(), []byte("")))
+
+	scriptTpl := MustTemplate(ModChart, []string{templates.BaseTpl, templates.BaseScriptTpl})
+	var scriptBuf bytes.Buffer // Buffer to collect template output
+
+	if err := scriptTpl.ExecuteTemplate(&scriptBuf, ModChart, r.c); err != nil {
+		panic(err)
+	}
+	snippet.Script = string(pat.ReplaceAll(scriptBuf.Bytes(), []byte("")))
+
+	return snippet
+}

render/engine.go

@@ -22,12 +22,18 @@ const (
 
 var pat = regexp.MustCompile(`(__f__")|("__f__)|(__f__)`)
 
+type ChartSnippet struct {
+	Element string
+	Script  string
+}
+
 // Renderer
 // Any kinds of charts have their render implementation and
 // you can define your own render logic easily.
 type Renderer interface {
 	Render(w io.Writer) error
 	RenderContent() []byte
+	RenderSnippet() ChartSnippet
 }
 
 // isSet check if the field exist in the chart instance

render/page.go

@@ -39,3 +39,29 @@ func (r *pageRender) RenderContent() []byte {
 
 	return pat.ReplaceAll(buf.Bytes(), []byte(""))
 }
+
+func (r *pageRender) RenderSnippet() ChartSnippet {
+	for _, fn := range r.before {
+		fn()
+	}
+
+	elementTpl := MustTemplate(ModPage, []string{templates.BaseTpl, templates.BaseElementTpl, templates.BaseElementsTpl})
+
+	var snippet ChartSnippet
+	var elementBuf bytes.Buffer
+
+	if err := elementTpl.ExecuteTemplate(&elementBuf, ModPage, r.c); err != nil {
+		panic(err)
+	}
+	snippet.Element = string(pat.ReplaceAll(elementBuf.Bytes(), []byte("")))
+
+	scriptTpl := MustTemplate(ModPage, []string{templates.BaseTpl, templates.BaseScriptTpl, templates.BaseScriptsTpl})
+	var scriptBuf bytes.Buffer
+
+	if err := scriptTpl.ExecuteTemplate(&scriptBuf, ModPage, r.c); err != nil {
+		panic(err)
+	}
+	snippet.Script = string(pat.ReplaceAll(scriptBuf.Bytes(), []byte("")))
+
+	return snippet
+}