eliminate a buffering level for paragraphs

block.go

@@ -1050,9 +1050,11 @@ func renderParagraph(out *bytes.Buffer, rndr *render, data []byte) {
 		return
 	}
 
-	var work bytes.Buffer
-	parseInline(&work, rndr, data[beg:end])
-	rndr.mk.Paragraph(out, work.Bytes(), rndr.mk.Opaque)
+	work := func() bool {
+		parseInline(out, rndr, data[beg:end])
+		return true
+	}
+	rndr.mk.Paragraph(out, work, rndr.mk.Opaque)
 }
 
 func blockParagraph(out *bytes.Buffer, rndr *render, data []byte) int {

html.go

@@ -384,13 +384,17 @@ func htmlListItem(out *bytes.Buffer, text []byte, flags int, opaque interface{})
 	out.WriteString("</li>\n")
 }
 
-func htmlParagraph(out *bytes.Buffer, text []byte, opaque interface{}) {
-	if out.Len() > 0 {
+func htmlParagraph(out *bytes.Buffer, text func() bool, opaque interface{}) {
+	marker := out.Len()
+	if marker > 0 {
 		out.WriteByte('\n')
 	}
 
 	out.WriteString("<p>")
-	out.Write(text)
+	if !text() {
+		out.Truncate(marker)
+		return
+	}
 	out.WriteString("</p>\n")
 }
 

latex.go

@@ -127,9 +127,13 @@ func latexListItem(out *bytes.Buffer, text []byte, flags int, opaque interface{}
 	out.Write(text)
 }
 
-func latexParagraph(out *bytes.Buffer, text []byte, opaque interface{}) {
+func latexParagraph(out *bytes.Buffer, text func() bool, opaque interface{}) {
+	marker := out.Len()
 	out.WriteString("\n")
-	out.Write(text)
+	if !text() {
+		out.Truncate(marker)
+		return
+	}
 	out.WriteString("\n")
 }
 

markdown.go

@@ -104,7 +104,7 @@ type Renderer struct {
 	HRule      func(out *bytes.Buffer, opaque interface{})
 	List       func(out *bytes.Buffer, text func() bool, flags int, opaque interface{})
 	ListItem   func(out *bytes.Buffer, text []byte, flags int, opaque interface{})
-	Paragraph  func(out *bytes.Buffer, text []byte, opaque interface{})
+	Paragraph  func(out *bytes.Buffer, text func() bool, opaque interface{})
 	Table      func(out *bytes.Buffer, header []byte, body []byte, columnData []int, opaque interface{})
 	TableRow   func(out *bytes.Buffer, text []byte, opaque interface{})
 	TableCell  func(out *bytes.Buffer, text []byte, flags int, opaque interface{})