@@ -51,15 +51,9 @@
 func HtmlRenderer(flags int) *Renderer {
 	// configure the rendering engine
 	r := new(Renderer)
-	if flags&HTML_GITHUB_BLOCKCODE == 0 {
-		r.BlockCode = htmlBlockCode
-	} else {
-		r.BlockCode = htmlBlockCodeGithub
-	}
+	r.BlockCode = htmlBlockCode
 	r.BlockQuote = htmlBlockQuote
-	if flags&HTML_SKIP_HTML == 0 {
-		r.BlockHtml = htmlRawBlock
-	}
+	r.BlockHtml = htmlBlockHtml
 	r.Header = htmlHeader
 	r.HRule = htmlHRule
 	r.List = htmlList
@@ -73,30 +67,19 @@ r.AutoLink = htmlAutoLink
 	r.CodeSpan = htmlCodeSpan
 	r.DoubleEmphasis = htmlDoubleEmphasis
 	r.Emphasis = htmlEmphasis
-	if flags&HTML_SKIP_IMAGES == 0 {
-		r.Image = htmlImage
-	}
+	r.Image = htmlImage
 	r.LineBreak = htmlLineBreak
-	if flags&HTML_SKIP_LINKS == 0 {
-		r.Link = htmlLink
-	}
+	r.Link = htmlLink
 	r.RawHtmlTag = htmlRawTag
 	r.TripleEmphasis = htmlTripleEmphasis
 	r.StrikeThrough = htmlStrikeThrough
-
-	var cb *SmartypantsRenderer
-	if flags&HTML_USE_SMARTYPANTS == 0 {
-		r.NormalText = htmlNormalText
-	} else {
-		cb = Smartypants(flags)
-		r.NormalText = htmlSmartypants
-	}
+	r.NormalText = htmlNormalText
 
 	closeTag := htmlClose
 	if flags&HTML_USE_XHTML != 0 {
 		closeTag = xhtmlClose
 	}
-	r.Opaque = &htmlOptions{flags: flags, closeTag: closeTag, smartypants: cb}
+	r.Opaque = &htmlOptions{flags: flags, closeTag: closeTag, smartypants: Smartypants(flags)}
 	return r
 }
 
@@ -189,7 +172,12 @@ }
 	out.WriteString(fmt.Sprintf("</h%d>\n", level))
 }
 
-func htmlRawBlock(out *bytes.Buffer, text []byte, opaque interface{}) {
+func htmlBlockHtml(out *bytes.Buffer, text []byte, opaque interface{}) {
+	options := opaque.(*htmlOptions)
+	if options.flags&HTML_SKIP_HTML != 0 {
+		return
+	}
+
 	sz := len(text)
 	for sz > 0 && text[sz-1] == '\n' {
 		sz--
@@ -219,6 +207,15 @@ out.WriteString(options.closeTag)
 }
 
 func htmlBlockCode(out *bytes.Buffer, text []byte, lang string, opaque interface{}) {
+	options := opaque.(*htmlOptions)
+	if options.flags&HTML_GITHUB_BLOCKCODE != 0 {
+		htmlBlockCodeGithub(out, text, lang, opaque)
+	} else {
+		htmlBlockCodeNormal(out, text, lang, opaque)
+	}
+}
+
+func htmlBlockCodeNormal(out *bytes.Buffer, text []byte, lang string, opaque interface{}) {
 	if out.Len() > 0 {
 		out.WriteByte('\n')
 	}
@@ -401,14 +398,14 @@ }
 	out.WriteString("</p>\n")
 }
 
-func htmlAutoLink(out *bytes.Buffer, link []byte, kind int, opaque interface{}) int {
+func htmlAutoLink(out *bytes.Buffer, link []byte, kind int, opaque interface{}) bool {
 	options := opaque.(*htmlOptions)
 
 	if len(link) == 0 {
-		return 0
+		return false
 	}
 	if options.flags&HTML_SAFELINK != 0 && !isSafeLink(link) && kind != LINK_TYPE_EMAIL {
-		return 0
+		return false
 	}
 
 	out.WriteString("<a href=\"")
@@ -434,40 +431,44 @@ }
 
 	out.WriteString("</a>")
 
-	return 1
+	return true
 }
 
-func htmlCodeSpan(out *bytes.Buffer, text []byte, opaque interface{}) int {
+func htmlCodeSpan(out *bytes.Buffer, text []byte, opaque interface{}) bool {
 	out.WriteString("<code>")
 	attrEscape(out, text)
 	out.WriteString("</code>")
-	return 1
+	return true
 }
 
-func htmlDoubleEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) int {
+func htmlDoubleEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) bool {
 	if len(text) == 0 {
-		return 0
+		return false
 	}
 	out.WriteString("<strong>")
 	out.Write(text)
 	out.WriteString("</strong>")
-	return 1
+	return true
 }
 
-func htmlEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) int {
+func htmlEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) bool {
 	if len(text) == 0 {
-		return 0
+		return false
 	}
 	out.WriteString("<em>")
 	out.Write(text)
 	out.WriteString("</em>")
-	return 1
+	return true
 }
 
-func htmlImage(out *bytes.Buffer, link []byte, title []byte, alt []byte, opaque interface{}) int {
+func htmlImage(out *bytes.Buffer, link []byte, title []byte, alt []byte, opaque interface{}) bool {
 	options := opaque.(*htmlOptions)
+	if options.flags&HTML_SKIP_IMAGES != 0 {
+		return false
+	}
+
 	if len(link) == 0 {
-		return 0
+		return false
 	}
 	out.WriteString("<img src=\"")
 	attrEscape(out, link)
@@ -482,21 +483,24 @@ }
 
 	out.WriteByte('"')
 	out.WriteString(options.closeTag)
-	return 1
+	return true
 }
 
-func htmlLineBreak(out *bytes.Buffer, opaque interface{}) int {
+func htmlLineBreak(out *bytes.Buffer, opaque interface{}) bool {
 	options := opaque.(*htmlOptions)
 	out.WriteString("<br")
 	out.WriteString(options.closeTag)
-	return 1
+	return true
 }
 
-func htmlLink(out *bytes.Buffer, link []byte, title []byte, content []byte, opaque interface{}) int {
+func htmlLink(out *bytes.Buffer, link []byte, title []byte, content []byte, opaque interface{}) bool {
 	options := opaque.(*htmlOptions)
+	if options.flags&HTML_SKIP_LINKS != 0 {
+		return false
+	}
 
 	if options.flags&HTML_SAFELINK != 0 && !isSafeLink(link) {
-		return 0
+		return false
 	}
 
 	out.WriteString("<a href=\"")
@@ -508,49 +512,54 @@ }
 	out.WriteString("\">")
 	out.Write(content)
 	out.WriteString("</a>")
-	return 1
+	return true
 }
 
-func htmlRawTag(out *bytes.Buffer, text []byte, opaque interface{}) int {
+func htmlRawTag(out *bytes.Buffer, text []byte, opaque interface{}) bool {
 	options := opaque.(*htmlOptions)
 	if options.flags&HTML_SKIP_HTML != 0 {
-		return 1
+		return true
 	}
 	if options.flags&HTML_SKIP_STYLE != 0 && isHtmlTag(text, "style") {
-		return 1
+		return true
 	}
 	if options.flags&HTML_SKIP_LINKS != 0 && isHtmlTag(text, "a") {
-		return 1
+		return true
 	}
 	if options.flags&HTML_SKIP_IMAGES != 0 && isHtmlTag(text, "img") {
-		return 1
+		return true
 	}
 	out.Write(text)
-	return 1
+	return true
 }
 
-func htmlTripleEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) int {
+func htmlTripleEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) bool {
 	if len(text) == 0 {
-		return 0
+		return false
 	}
 	out.WriteString("<strong><em>")
 	out.Write(text)
 	out.WriteString("</em></strong>")
-	return 1
+	return true
 }
 
-func htmlStrikeThrough(out *bytes.Buffer, text []byte, opaque interface{}) int {
+func htmlStrikeThrough(out *bytes.Buffer, text []byte, opaque interface{}) bool {
 	if len(text) == 0 {
-		return 0
+		return false
 	}
 	out.WriteString("<del>")
 	out.Write(text)
 	out.WriteString("</del>")
-	return 1
+	return true
 }
 
 func htmlNormalText(out *bytes.Buffer, text []byte, opaque interface{}) {
-	attrEscape(out, text)
+	options := opaque.(*htmlOptions)
+	if options.flags&HTML_USE_SMARTYPANTS != 0 {
+		htmlSmartypants(out, text, opaque)
+	} else {
+		attrEscape(out, text)
+	}
 }
 
 func htmlTocHeader(out *bytes.Buffer, text func() bool, level int, opaque interface{}) {

@@ -146,7 +146,7 @@ // render the code span
 	if parser.r.CodeSpan == nil {
 		return 0
 	}
-	if parser.r.CodeSpan(out, data[fBegin:fEnd], parser.r.Opaque) == 0 {
+	if !parser.r.CodeSpan(out, data[fBegin:fEnd], parser.r.Opaque) {
 		end = 0
 	}
 
@@ -174,7 +174,7 @@
 	if parser.r.LineBreak == nil {
 		return 0
 	}
-	if parser.r.LineBreak(out, parser.r.Opaque) > 0 {
+	if parser.r.LineBreak(out, parser.r.Opaque) {
 		return 1
 	} else {
 		return 0
@@ -431,7 +431,7 @@ uLink = uLinkBuf.Bytes()
 	}
 
 	// call the relevant rendering function
-	ret := 0
+	ret := false
 	if isImg {
 		outSize := out.Len()
 		outBytes := out.Bytes()
@@ -444,7 +444,7 @@ } else {
 		ret = parser.r.Link(out, uLink, title, content.Bytes(), parser.r.Opaque)
 	}
 
-	if ret > 0 {
+	if ret {
 		return i
 	}
 	return 0
@@ -455,7 +455,7 @@ func inlineLAngle(out *bytes.Buffer, parser *Parser, data []byte, offset int) int {
 	data = data[offset:]
 	altype := LINK_TYPE_NOT_AUTOLINK
 	end := tagLength(data, &altype)
-	ret := 0
+	ret := false
 
 	if end > 2 {
 		switch {
@@ -468,7 +468,7 @@ ret = parser.r.RawHtmlTag(out, data[:end], parser.r.Opaque)
 		}
 	}
 
-	if ret == 0 {
+	if !ret {
 		return 0
 	}
 	return end
@@ -897,8 +897,7 @@ }
 
 			var work bytes.Buffer
 			parser.parseInline(&work, data[:i])
-			r := parser.r.Emphasis(out, work.Bytes(), parser.r.Opaque)
-			if r > 0 {
+			if parser.r.Emphasis(out, work.Bytes(), parser.r.Opaque) {
 				return i + 1
 			} else {
 				return 0
@@ -931,8 +930,7 @@
 		if i+1 < len(data) && data[i] == c && data[i+1] == c && i > 0 && !isspace(data[i-1]) {
 			var work bytes.Buffer
 			parser.parseInline(&work, data[:i])
-			r := renderMethod(out, work.Bytes(), parser.r.Opaque)
-			if r > 0 {
+			if renderMethod(out, work.Bytes(), parser.r.Opaque) {
 				return i + 2
 			} else {
 				return 0
@@ -966,8 +964,7 @@ // triple symbol found
 			var work bytes.Buffer
 
 			parser.parseInline(&work, data[:i])
-			r := parser.r.TripleEmphasis(out, work.Bytes(), parser.r.Opaque)
-			if r > 0 {
+			if parser.r.TripleEmphasis(out, work.Bytes(), parser.r.Opaque) {
 				return i + 3
 			} else {
 				return 0

@@ -173,7 +173,7 @@ }
 	out.Write(text)
 }
 
-func latexAutoLink(out *bytes.Buffer, link []byte, kind int, opaque interface{}) int {
+func latexAutoLink(out *bytes.Buffer, link []byte, kind int, opaque interface{}) bool {
 	out.WriteString("\\href{")
 	if kind == LINK_TYPE_EMAIL {
 		out.WriteString("mailto:")
@@ -182,31 +182,31 @@ out.Write(link)
 	out.WriteString("}{")
 	out.Write(link)
 	out.WriteString("}")
-	return 1
+	return true
 }
 
-func latexCodeSpan(out *bytes.Buffer, text []byte, opaque interface{}) int {
+func latexCodeSpan(out *bytes.Buffer, text []byte, opaque interface{}) bool {
 	out.WriteString("\\texttt{")
 	escapeSpecialChars(out, text)
 	out.WriteString("}")
-	return 1
+	return true
 }
 
-func latexDoubleEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) int {
+func latexDoubleEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) bool {
 	out.WriteString("\\textbf{")
 	out.Write(text)
 	out.WriteString("}")
-	return 1
+	return true
 }
 
-func latexEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) int {
+func latexEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) bool {
 	out.WriteString("\\textit{")
 	out.Write(text)
 	out.WriteString("}")
-	return 1
+	return true
 }
 
-func latexImage(out *bytes.Buffer, link []byte, title []byte, alt []byte, opaque interface{}) int {
+func latexImage(out *bytes.Buffer, link []byte, title []byte, alt []byte, opaque interface{}) bool {
 	if bytes.HasPrefix(link, []byte("http://")) || bytes.HasPrefix(link, []byte("https://")) {
 		// treat it like a link
 		out.WriteString("\\href{")
@@ -219,39 +219,39 @@ out.WriteString("\\includegraphics{")
 		out.Write(link)
 		out.WriteString("}")
 	}
-	return 1
+	return true
 }
 
-func latexLineBreak(out *bytes.Buffer, opaque interface{}) int {
+func latexLineBreak(out *bytes.Buffer, opaque interface{}) bool {
 	out.WriteString(" \\\\\n")
-	return 1
+	return true
 }
 
-func latexLink(out *bytes.Buffer, link []byte, title []byte, content []byte, opaque interface{}) int {
+func latexLink(out *bytes.Buffer, link []byte, title []byte, content []byte, opaque interface{}) bool {
 	out.WriteString("\\href{")
 	out.Write(link)
 	out.WriteString("}{")
 	out.Write(content)
 	out.WriteString("}")
-	return 1
+	return true
 }
 
-func latexRawHtmlTag(out *bytes.Buffer, tag []byte, opaque interface{}) int {
-	return 0
+func latexRawHtmlTag(out *bytes.Buffer, tag []byte, opaque interface{}) bool {
+	return true
 }
 
-func latexTripleEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) int {
+func latexTripleEmphasis(out *bytes.Buffer, text []byte, opaque interface{}) bool {
 	out.WriteString("\\textbf{\\textit{")
 	out.Write(text)
 	out.WriteString("}}")
-	return 1
+	return true
 }
 
-func latexStrikeThrough(out *bytes.Buffer, text []byte, opaque interface{}) int {
+func latexStrikeThrough(out *bytes.Buffer, text []byte, opaque interface{}) bool {
 	out.WriteString("\\sout{")
 	out.Write(text)
 	out.WriteString("}")
-	return 1
+	return true
 }
 
 func needsBackslash(c byte) bool {

@@ -119,17 +119,17 @@ 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{})
 
-	// Span-level callbacks---nil or return 0 prints the span verbatim
-	AutoLink       func(out *bytes.Buffer, link []byte, kind int, opaque interface{}) int
-	CodeSpan       func(out *bytes.Buffer, text []byte, opaque interface{}) int
-	DoubleEmphasis func(out *bytes.Buffer, text []byte, opaque interface{}) int
-	Emphasis       func(out *bytes.Buffer, text []byte, opaque interface{}) int
-	Image          func(out *bytes.Buffer, link []byte, title []byte, alt []byte, opaque interface{}) int
-	LineBreak      func(out *bytes.Buffer, opaque interface{}) int
-	Link           func(out *bytes.Buffer, link []byte, title []byte, content []byte, opaque interface{}) int
-	RawHtmlTag     func(out *bytes.Buffer, tag []byte, opaque interface{}) int
-	TripleEmphasis func(out *bytes.Buffer, text []byte, opaque interface{}) int
-	StrikeThrough  func(out *bytes.Buffer, text []byte, opaque interface{}) int
+	// Span-level callbacks---nil or return false prints the span verbatim
+	AutoLink       func(out *bytes.Buffer, link []byte, kind int, opaque interface{}) bool
+	CodeSpan       func(out *bytes.Buffer, text []byte, opaque interface{}) bool
+	DoubleEmphasis func(out *bytes.Buffer, text []byte, opaque interface{}) bool
+	Emphasis       func(out *bytes.Buffer, text []byte, opaque interface{}) bool
+	Image          func(out *bytes.Buffer, link []byte, title []byte, alt []byte, opaque interface{}) bool
+	LineBreak      func(out *bytes.Buffer, opaque interface{}) bool
+	Link           func(out *bytes.Buffer, link []byte, title []byte, content []byte, opaque interface{}) bool
+	RawHtmlTag     func(out *bytes.Buffer, tag []byte, opaque interface{}) bool
+	TripleEmphasis func(out *bytes.Buffer, text []byte, opaque interface{}) bool
+	StrikeThrough  func(out *bytes.Buffer, text []byte, opaque interface{}) bool
 
 	// Low-level callbacks---nil copies input directly into the output
 	Entity     func(out *bytes.Buffer, entity []byte, opaque interface{})

@@ -39,7 +39,7 @@ func isdigit(c byte) bool {
 	return c >= '0' && c <= '9'
 }
 
-func smartQuotesHelper(ob *bytes.Buffer, previousChar byte, nextChar byte, quote byte, isOpen *bool) bool {
+func smartQuotesHelper(out *bytes.Buffer, previousChar byte, nextChar byte, quote byte, isOpen *bool) bool {
 	// edge of the buffer is likely to be a tag that we don't get to see,
 	// so we treat it like text sometimes
 
@@ -96,18 +96,18 @@ // [a'b] maybe a contraction?
 		*isOpen = false
 	}
 
-	ob.WriteByte('&')
+	out.WriteByte('&')
 	if *isOpen {
-		ob.WriteByte('l')
+		out.WriteByte('l')
 	} else {
-		ob.WriteByte('r')
+		out.WriteByte('r')
 	}
-	ob.WriteByte(quote)
-	ob.WriteString("quo;")
+	out.WriteByte(quote)
+	out.WriteString("quo;")
 	return true
 }
 
-func smartSquote(ob *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
+func smartSquote(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if len(text) >= 2 {
 		t1 := tolower(text[1])
 
@@ -116,21 +116,22 @@ nextChar := byte(0)
 			if len(text) >= 3 {
 				nextChar = text[2]
 			}
-			if smartQuotesHelper(ob, previousChar, nextChar, 'd', &smrt.inDoubleQuote) {
+			if smartQuotesHelper(out, previousChar, nextChar, 'd', &smrt.inDoubleQuote) {
 				return 1
 			}
 		}
 
 		if (t1 == 's' || t1 == 't' || t1 == 'm' || t1 == 'd') && (len(text) < 3 || wordBoundary(text[2])) {
-			ob.WriteString("&rsquo;")
+			out.WriteString("&rsquo;")
 			return 0
 		}
 
 		if len(text) >= 3 {
 			t2 := tolower(text[2])
 
-			if ((t1 == 'r' && t2 == 'e') || (t1 == 'l' && t2 == 'l') || (t1 == 'v' && t2 == 'e')) && (len(text) < 4 || wordBoundary(text[3])) {
-				ob.WriteString("&rsquo;")
+			if ((t1 == 'r' && t2 == 'e') || (t1 == 'l' && t2 == 'l') || (t1 == 'v' && t2 == 'e')) &&
+				(len(text) < 4 || wordBoundary(text[3])) {
+				out.WriteString("&rsquo;")
 				return 0
 			}
 		}
@@ -140,77 +141,77 @@ nextChar := byte(0)
 	if len(text) > 1 {
 		nextChar = text[1]
 	}
-	if smartQuotesHelper(ob, previousChar, nextChar, 's', &smrt.inSingleQuote) {
+	if smartQuotesHelper(out, previousChar, nextChar, 's', &smrt.inSingleQuote) {
 		return 0
 	}
 
-	ob.WriteByte(text[0])
+	out.WriteByte(text[0])
 	return 0
 }
 
-func smartParens(ob *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
+func smartParens(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if len(text) >= 3 {
 		t1 := tolower(text[1])
 		t2 := tolower(text[2])
 
 		if t1 == 'c' && t2 == ')' {
-			ob.WriteString("&copy;")
+			out.WriteString("&copy;")
 			return 2
 		}
 
 		if t1 == 'r' && t2 == ')' {
-			ob.WriteString("&reg;")
+			out.WriteString("&reg;")
 			return 2
 		}
 
 		if len(text) >= 4 && t1 == 't' && t2 == 'm' && text[3] == ')' {
-			ob.WriteString("&trade;")
+			out.WriteString("&trade;")
 			return 3
 		}
 	}
 
-	ob.WriteByte(text[0])
+	out.WriteByte(text[0])
 	return 0
 }
 
-func smartDash(ob *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
+func smartDash(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if len(text) >= 2 {
 		if text[1] == '-' {
-			ob.WriteString("&mdash;")
+			out.WriteString("&mdash;")
 			return 1
 		}
 
 		if wordBoundary(previousChar) && wordBoundary(text[1]) {
-			ob.WriteString("&ndash;")
+			out.WriteString("&ndash;")
 			return 0
 		}
 	}
 
-	ob.WriteByte(text[0])
+	out.WriteByte(text[0])
 	return 0
 }
 
-func smartDashLatex(ob *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
+func smartDashLatex(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if len(text) >= 3 && text[1] == '-' && text[2] == '-' {
-		ob.WriteString("&mdash;")
+		out.WriteString("&mdash;")
 		return 2
 	}
 	if len(text) >= 2 && text[1] == '-' {
-		ob.WriteString("&ndash;")
+		out.WriteString("&ndash;")
 		return 1
 	}
 
-	ob.WriteByte(text[0])
+	out.WriteByte(text[0])
 	return 0
 }
 
-func smartAmp(ob *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
+func smartAmp(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if bytes.HasPrefix(text, []byte("&quot;")) {
 		nextChar := byte(0)
 		if len(text) >= 7 {
 			nextChar = text[6]
 		}
-		if smartQuotesHelper(ob, previousChar, nextChar, 'd', &smrt.inDoubleQuote) {
+		if smartQuotesHelper(out, previousChar, nextChar, 'd', &smrt.inDoubleQuote) {
 			return 5
 		}
 	}
@@ -219,32 +220,32 @@ if bytes.HasPrefix(text, []byte("&#0;")) {
 		return 3
 	}
 
-	ob.WriteByte('&')
+	out.WriteByte('&')
 	return 0
 }
 
-func smartPeriod(ob *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
+func smartPeriod(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if len(text) >= 3 && text[1] == '.' && text[2] == '.' {
-		ob.WriteString("&hellip;")
+		out.WriteString("&hellip;")
 		return 2
 	}
 
 	if len(text) >= 5 && text[1] == ' ' && text[2] == '.' && text[3] == ' ' && text[4] == '.' {
-		ob.WriteString("&hellip;")
+		out.WriteString("&hellip;")
 		return 4
 	}
 
-	ob.WriteByte(text[0])
+	out.WriteByte(text[0])
 	return 0
 }
 
-func smartBacktick(ob *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
+func smartBacktick(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if len(text) >= 2 && text[1] == '`' {
 		nextChar := byte(0)
 		if len(text) >= 3 {
 			nextChar = text[2]
 		}
-		if smartQuotesHelper(ob, previousChar, nextChar, 'd', &smrt.inDoubleQuote) {
+		if smartQuotesHelper(out, previousChar, nextChar, 'd', &smrt.inDoubleQuote) {
 			return 1
 		}
 	}
@@ -252,7 +253,7 @@
 	return 0
 }
 
-func smartNumberGeneric(ob *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
+func smartNumberGeneric(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if wordBoundary(previousChar) && len(text) >= 3 {
 		// is it of the form digits/digits(word boundary)?, i.e., \d+/\d+\b
 		numEnd := 0
@@ -260,11 +261,11 @@ for len(text) > numEnd && isdigit(text[numEnd]) {
 			numEnd++
 		}
 		if numEnd == 0 {
-			ob.WriteByte(text[0])
+			out.WriteByte(text[0])
 			return 0
 		}
 		if len(text) < numEnd+2 || text[numEnd] != '/' {
-			ob.WriteByte(text[0])
+			out.WriteByte(text[0])
 			return 0
 		}
 		denEnd := numEnd + 1
@@ -272,75 +273,75 @@ for len(text) > denEnd && isdigit(text[denEnd]) {
 			denEnd++
 		}
 		if denEnd == numEnd+1 {
-			ob.WriteByte(text[0])
+			out.WriteByte(text[0])
 			return 0
 		}
 		if len(text) == denEnd || wordBoundary(text[denEnd]) {
-			ob.WriteString("<sup>")
-			ob.Write(text[:numEnd])
-			ob.WriteString("</sup>&frasl;<sub>")
-			ob.Write(text[numEnd+1 : denEnd])
-			ob.WriteString("</sub>")
+			out.WriteString("<sup>")
+			out.Write(text[:numEnd])
+			out.WriteString("</sup>&frasl;<sub>")
+			out.Write(text[numEnd+1 : denEnd])
+			out.WriteString("</sub>")
 			return denEnd - 1
 		}
 	}
 
-	ob.WriteByte(text[0])
+	out.WriteByte(text[0])
 	return 0
 }
 
-func smartNumber(ob *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
+func smartNumber(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	if wordBoundary(previousChar) && len(text) >= 3 {
 		if text[0] == '1' && text[1] == '/' && text[2] == '2' {
 			if len(text) < 4 || wordBoundary(text[3]) {
-				ob.WriteString("&frac12;")
+				out.WriteString("&frac12;")
 				return 2
 			}
 		}
 
 		if text[0] == '1' && text[1] == '/' && text[2] == '4' {
 			if len(text) < 4 || wordBoundary(text[3]) || (len(text) >= 5 && tolower(text[3]) == 't' && tolower(text[4]) == 'h') {
-				ob.WriteString("&frac14;")
+				out.WriteString("&frac14;")
 				return 2
 			}
 		}
 
 		if text[0] == '3' && text[1] == '/' && text[2] == '4' {
 			if len(text) < 4 || wordBoundary(text[3]) || (len(text) >= 6 && tolower(text[3]) == 't' && tolower(text[4]) == 'h' && tolower(text[5]) == 's') {
-				ob.WriteString("&frac34;")
+				out.WriteString("&frac34;")
 				return 2
 			}
 		}
 	}
 
-	ob.WriteByte(text[0])
+	out.WriteByte(text[0])
 	return 0
 }
 
-func smartDquote(ob *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
+func smartDquote(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	nextChar := byte(0)
 	if len(text) > 1 {
 		nextChar = text[1]
 	}
-	if !smartQuotesHelper(ob, previousChar, nextChar, 'd', &smrt.inDoubleQuote) {
-		ob.WriteString("&quot;")
+	if !smartQuotesHelper(out, previousChar, nextChar, 'd', &smrt.inDoubleQuote) {
+		out.WriteString("&quot;")
 	}
 
 	return 0
 }
 
-func smartLtag(ob *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
+func smartLtag(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int {
 	i := 0
 
 	for i < len(text) && text[i] != '>' {
 		i++
 	}
 
-	ob.Write(text[:i+1])
+	out.Write(text[:i+1])
 	return i
 }
 
-type smartCallback func(ob *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int
+type smartCallback func(out *bytes.Buffer, smrt *smartypantsData, previousChar byte, text []byte) int
 
 type SmartypantsRenderer [256]smartCallback
 
@@ -369,7 +370,7 @@ r['`'] = smartBacktick
 	return r
 }
 
-func htmlSmartypants(ob *bytes.Buffer, text []byte, opaque interface{}) {
+func htmlSmartypants(out *bytes.Buffer, text []byte, opaque interface{}) {
 	options := opaque.(*htmlOptions)
 	smrt := smartypantsData{false, false}
 
@@ -382,19 +383,19 @@ mark := 0
 	for i := 0; i < len(text); i++ {
 		if action := options.smartypants[text[i]]; action != nil {
 			if i > mark {
-				ob.Write(text[mark:i])
+				out.Write(text[mark:i])
 			}
 
 			previousChar := byte(0)
 			if i > 0 {
 				previousChar = text[i-1]
 			}
-			i += action(ob, &smrt, previousChar, text[i:])
+			i += action(out, &smrt, previousChar, text[i:])
 			mark = i + 1
 		}
 	}
 
 	if mark < len(text) {
-		ob.Write(text[mark:])
+		out.Write(text[mark:])
 	}
 }