all: replace linter golangci-lint with revive and shadow

The golangci-lint does not output any results anymore
Either we are getting good at writing Go or the linter itself is become
less good.
We also have seen that the latest golangci-lint is failed to build
with Go tip, a simple "make" on the golangci-lint never success in my
experiences.

This changes fix all the output reported by the revive and shadow.

17 files changed, 104 insertions, 118 deletions

diff --git a/Makefile b/Makefile
index bd9a9d8..17088d1 100644
--- a/Makefile
+++ b/Makefile
@@ -6,8 +6,9 @@
 all: test lint
 
 lint:
-	-golangci-lint run ./...
+	-revive ./...
 	-fieldalignment ./...
+	-shadow ./...
 
 test:
 	go test -coverprofile=cover.out ./...
diff --git a/asciidoctor.go b/asciidoctor.go
index 7e91f40..26ed706 100644
--- a/asciidoctor.go
+++ b/asciidoctor.go
@@ -1,7 +1,7 @@
 // SPDX-FileCopyrightText: 2020 M. Shulhan <ms@kilabit.info>
 // SPDX-License-Identifier: GPL-3.0-or-later
 
-// Package asciidoctor-go is the Go module to parse the [AsciiDoc markup].
+// Package asciidoctor is the Go module to parse the [AsciiDoc markup].
 // Its currently support converting the asciidoc to HTML5.
 //
 // [AsciiDoc markup]: https://asciidoctor.org/docs/what-is-asciidoc
diff --git a/asciidoctor_test.go b/asciidoctor_test.go
index 387c5ed..8944165 100644
--- a/asciidoctor_test.go
+++ b/asciidoctor_test.go
@@ -11,7 +11,7 @@ import (
 )
 
 const (
-	outputCallHtmlWriteHeader = `htmlWriteHeader`
+	outputCallHTMLWriteHeader = `htmlWriteHeader`
 	outputCallToHTML          = `ToHTML`
 	outputCallToHTMLBody      = `ToHTMLBody`
 )
@@ -58,7 +58,7 @@ func TestData(t *testing.T) {
 				}
 
 				switch outputCall {
-				case outputCallHtmlWriteHeader:
+				case outputCallHTMLWriteHeader:
 					htmlWriteHeader(doc, &bbuf)
 				case outputCallToHTML:
 					err = doc.ToHTML(&bbuf)
diff --git a/document.go b/document.go
index f716dd9..47d2c85 100644
--- a/document.go
+++ b/document.go
@@ -134,7 +134,7 @@ func Parse(content []byte) (doc *Document) {
 
 func parse(doc *Document, content []byte) {
 	var (
-		docp *documentParser = newDocumentParser(doc, content)
+		docp = newDocumentParser(doc, content)
 
 		sectLevel string
 		ok        bool
@@ -206,7 +206,7 @@ func (doc *Document) ToHTML(out io.Writer) (err error) {
 		fmt.Fprintf(buf, "\n<meta name=%q content=%q>", MetaNameAuthor, metaValue)
 	}
 
-	var title string = doc.Title.String()
+	var title = doc.Title.String()
 	if len(title) > 0 {
 		fmt.Fprintf(buf, "\n<title>%s</title>", title)
 	}
@@ -413,13 +413,13 @@ func (doc *Document) unpackRawAuthor() {
 	}
 
 	var (
-		rawAuthors    []string = strings.Split(doc.rawAuthors, `;`)
-		authorKey              = MetaNameAuthor
-		emailKey               = metaNameEmail
-		initialsKey            = metaNameAuthorInitials
-		firstNameKey           = metaNameFirstName
-		middleNameKey          = metaNameMiddleName
-		lastNameKey            = metaNameLastName
+		rawAuthors    = strings.Split(doc.rawAuthors, `;`)
+		authorKey     = MetaNameAuthor
+		emailKey      = metaNameEmail
+		initialsKey   = metaNameAuthorInitials
+		firstNameKey  = metaNameFirstName
+		middleNameKey = metaNameMiddleName
+		lastNameKey   = metaNameLastName
 
 		author    *Author
 		rawAuthor string
diff --git a/document_parser.go b/document_parser.go
index baeb82e..d165ff9 100644
--- a/document_parser.go
+++ b/document_parser.go
@@ -157,9 +157,7 @@ func (docp *documentParser) hasPreamble() bool {
 }
 
 func (docp *documentParser) include(el *elementInclude) {
-	var (
-		content []byte = bytes.ReplaceAll(el.content, []byte("\r\n"), []byte("\n"))
-	)
+	var content = bytes.ReplaceAll(el.content, []byte("\r\n"), []byte("\n"))
 
 	content = bytes.TrimRight(content, "\n")
 
@@ -351,9 +349,7 @@ func (docp *documentParser) parseBlock(parent *element, term int) {
 			continue
 
 		case lineKindInclude:
-			var (
-				elInclude *elementInclude = parseInclude(docp.doc, []byte(line))
-			)
+			var elInclude = parseInclude(docp.doc, []byte(line))
 
 			if elInclude == nil {
 				el.Write(line)
@@ -466,7 +462,7 @@ func (docp *documentParser) parseBlock(parent *element, term int) {
 			// BUG: "= =a" could become "a", it should be "=a"
 			el.Write(bytes.TrimLeft(line, "= \t"))
 
-			var isDiscrete bool = el.style&styleSectionDiscrete > 0
+			var isDiscrete = el.style&styleSectionDiscrete > 0
 			if isDiscrete {
 				el.kind = elKindSectionDiscrete
 				el.level = docp.kind
@@ -588,7 +584,7 @@ func (docp *documentParser) parseBlock(parent *element, term int) {
 			continue
 
 		case elKindBlockImage:
-			var lineImage []byte = bytes.TrimRight(line[7:], " \t")
+			var lineImage = bytes.TrimRight(line[7:], " \t")
 			if el.parseBlockImage(docp.doc, lineImage) {
 				el.kind = docp.kind
 				line = nil
@@ -690,8 +686,8 @@ func (docp *documentParser) parseHeader() {
 	)
 
 	var (
-		logp      = `parseHeader`
-		state int = stateBegin
+		logp  = `parseHeader`
+		state = stateBegin
 
 		key   string
 		value string
@@ -942,7 +938,6 @@ func (docp *documentParser) parseListDescription(parent, el *element, line []byt
 			continue
 		}
 		if docp.kind == lineKindListContinue {
-			var el *element
 			el, line = docp.parseListBlock()
 			if el != nil {
 				listItem.addChild(el)
@@ -976,7 +971,7 @@ func (docp *documentParser) parseListDescription(parent, el *element, line []byt
 				continue
 			}
 
-			var parentListItem *element = parent
+			var parentListItem = parent
 			for parentListItem != nil {
 				if parentListItem.kind == docp.kind &&
 					parentListItem.level == el.level {
diff --git a/document_test.go b/document_test.go
index f36be73..7fc692f 100644
--- a/document_test.go
+++ b/document_test.go
@@ -100,18 +100,18 @@ func TestDocument_ToHTML(t *testing.T) {
 	type testCase struct {
 		name        string
 		fileAdoc    string
-		fileExpHtml string
+		fileExpHTML string
 	}
 
 	var (
 		cases = []testCase{{
 			name:        `header`,
 			fileAdoc:    `testdata/html/header.adoc`,
-			fileExpHtml: `testdata/html/header.exp.html`,
+			fileExpHTML: `testdata/html/header.exp.html`,
 		}, {
 			name:        `preamble`,
 			fileAdoc:    `testdata/html/preamble.adoc`,
-			fileExpHtml: `testdata/html/preamble.exp.html`,
+			fileExpHTML: `testdata/html/preamble.exp.html`,
 		}}
 
 		c   testCase
@@ -138,7 +138,7 @@ func TestDocument_ToHTML(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		exp, err = os.ReadFile(c.fileExpHtml)
+		exp, err = os.ReadFile(c.fileExpHTML)
 		if err != nil {
 			t.Fatal(err)
 		}
diff --git a/document_title.go b/document_title.go
index 9312fd4..55b2419 100644
--- a/document_title.go
+++ b/document_title.go
@@ -5,6 +5,7 @@ package asciidoctor
 
 import "fmt"
 
+// DocumentTitle contains the main and optional sub title.
 type DocumentTitle struct {
 	el *element
 
diff --git a/element.go b/element.go
index db8c6a6..3e2125e 100644
--- a/element.go
+++ b/element.go
@@ -82,8 +82,8 @@ func (el *element) getListOrderedType() string {
 // getVideoSource generate video full URL for HTML attribute `src`.
 func (el *element) getVideoSource() string {
 	var (
-		u          = new(url.URL)
-		src string = el.Attrs[attrNameSrc]
+		u   = new(url.URL)
+		src = el.Attrs[attrNameSrc]
 
 		q        []string
 		fragment string
@@ -239,7 +239,7 @@ func (el *element) addChild(child *element) {
 	if el.child == nil {
 		el.child = child
 	} else {
-		var c *element = el.child
+		var c = el.child
 		for c.next != nil {
 			c = c.next
 		}
@@ -250,7 +250,7 @@ func (el *element) addChild(child *element) {
 
 // backTrimSpace remove trailing white spaces on raw field.
 func (el *element) backTrimSpace() {
-	var x int = len(el.raw) - 1
+	var x = len(el.raw) - 1
 	for ; x > 0; x-- {
 		if ascii.IsSpace(el.raw[x]) {
 			continue
@@ -277,17 +277,17 @@ func (el *element) lastSuccessor() (last *element) {
 func (el *element) parseBlockAudio(doc *Document, line []byte) bool {
 	line = bytes.TrimRight(line[7:], " \t")
 
-	var attrBegin int = bytes.IndexByte(line, '[')
+	var attrBegin = bytes.IndexByte(line, '[')
 	if attrBegin < 0 {
 		return false
 	}
 
-	var attrEnd int = bytes.IndexByte(line, ']')
+	var attrEnd = bytes.IndexByte(line, ']')
 	if attrEnd < 0 {
 		return false
 	}
 
-	var src []byte = bytes.TrimRight(line[:attrBegin], " \t")
+	var src = bytes.TrimRight(line[:attrBegin], " \t")
 	if el.Attrs == nil {
 		el.Attrs = make(map[string]string)
 	}
@@ -303,7 +303,7 @@ func (el *element) parseBlockAudio(doc *Document, line []byte) bool {
 // The line parameter must not have "image::" block or "image:" macro prefix.
 func (el *element) parseBlockImage(doc *Document, line []byte) bool {
 	var (
-		attrBegin int = bytes.IndexByte(line, '[')
+		attrBegin = bytes.IndexByte(line, '[')
 
 		attr string
 		key  string
@@ -398,7 +398,7 @@ func (el *element) parseInlineMarkup(doc *Document, kind int) {
 		return
 	}
 
-	var container *element = parseInlineMarkup(doc, el.raw)
+	var container = parseInlineMarkup(doc, el.raw)
 	if kind != 0 {
 		container.kind = kind
 	}
@@ -414,9 +414,9 @@ func (el *element) parseInlineMarkup(doc *Document, kind int) {
 
 func (el *element) parseLineAdmonition(line []byte) {
 	var (
-		sep      int    = bytes.IndexByte(line, ':')
-		class    string = string(bytes.ToLower(line[:sep]))
-		rawLabel string = admonitionToLabel(class)
+		sep      = bytes.IndexByte(line, ':')
+		class    = string(bytes.ToLower(line[:sep]))
+		rawLabel = admonitionToLabel(class)
 	)
 
 	el.addRole(class)
@@ -544,7 +544,7 @@ func (el *element) parseSection(doc *Document, isDiscrete bool) {
 	}
 
 	var (
-		container *element = parseInlineMarkup(doc, el.raw)
+		container = parseInlineMarkup(doc, el.raw)
 
 		lastChild *element
 		p         *element
@@ -652,7 +652,7 @@ func (el *element) parseBlockVideo(doc *Document, line []byte) bool {
 
 func (el *element) postParseList(doc *Document, kind int) {
 	var (
-		item *element = el.child
+		item = el.child
 		raw  []byte
 	)
 
@@ -682,9 +682,7 @@ func (el *element) postParseParagraph(parent *element) {
 
 	el.raw = bytes.TrimRight(el.raw, " \t\n")
 
-	var (
-		lines [][]byte = bytes.Split(el.raw, []byte{'\n'})
-	)
+	var lines = bytes.Split(el.raw, []byte{'\n'})
 
 	if len(lines) <= 1 {
 		return
@@ -695,7 +693,7 @@ func (el *element) postParseParagraph(parent *element) {
 
 func (el *element) postParseParagraphAsQuote(lines [][]byte) bool {
 	var (
-		lastLine []byte = lines[len(lines)-1]
+		lastLine = lines[len(lines)-1]
 
 		firstLine      []byte
 		secondLastLine []byte
@@ -746,10 +744,11 @@ func (el *element) postParseParagraphAsQuote(lines [][]byte) bool {
 	}
 
 	el.kind = elKindBlockExcerpts
-	var opts []string = strings.SplitN(string(lastLine[3:]), `,`, 2)
 	if el.Attrs == nil {
 		el.Attrs = make(map[string]string)
 	}
+
+	var opts = strings.SplitN(string(lastLine[3:]), `,`, 2)
 	if len(opts) >= 1 {
 		el.Attrs[attrNameAttribution] = strings.TrimSpace(opts[0])
 	}
@@ -771,7 +770,7 @@ func (el *element) removeLastIfEmpty() {
 	if el.child == nil {
 		return
 	}
-	var c *element = el
+	var c = el
 	for c.child != nil {
 		c = c.child
 		for c.next != nil {
@@ -796,7 +795,8 @@ func (el *element) removeLastIfEmpty() {
 func (el *element) setStyleAdmonition(admName string) {
 	admName = strings.ToLower(admName)
 	el.addRole(admName)
-	var rawLabel string = admonitionToLabel(admName)
+
+	var rawLabel = admonitionToLabel(admName)
 	el.rawLabel.WriteString(rawLabel)
 }
 
@@ -807,9 +807,9 @@ func (el *element) toHTML(doc *Document, w io.Writer) {
 
 	case elKindCrossReference:
 		var (
-			href   string  = el.Attrs[attrNameHref]
-			label          = string(el.raw)
-			anchor *anchor = doc.anchors[href]
+			href   = el.Attrs[attrNameHref]
+			label  = string(el.raw)
+			anchor = doc.anchors[href]
 		)
 		if anchor == nil {
 			href = doc.titleID[href]
diff --git a/element_attribute.go b/element_attribute.go
index d08538d..0d46b8b 100644
--- a/element_attribute.go
+++ b/element_attribute.go
@@ -135,15 +135,15 @@ func (ea *elementAttribute) parseElementAttribute(raw []byte) {
 	}
 }
 
-func (ea *elementAttribute) parseNamedValue(prevc byte, str string) {
+func (ea *elementAttribute) parseNamedValue(str string) {
 	if ea.Attrs == nil {
 		ea.Attrs = make(map[string]string)
 	}
 
 	var (
-		kv  []string = strings.Split(str, `=`)
-		key          = kv[0]
-		val          = strings.TrimSpace(kv[1])
+		kv  = strings.Split(str, `=`)
+		key = kv[0]
+		val = strings.TrimSpace(kv[1])
 	)
 
 	if len(val) == 0 {
@@ -158,8 +158,8 @@ func (ea *elementAttribute) parseNamedValue(prevc byte, str string) {
 	}
 
 	var (
-		rawvals []string = strings.Split(val, `,`)
-		vals             = make([]string, 0, len(rawvals))
+		rawvals = strings.Split(val, `,`)
+		vals    = make([]string, 0, len(rawvals))
 
 		v string
 	)
@@ -186,7 +186,7 @@ func (ea *elementAttribute) setByPreviousChar(prevc byte, str string) {
 	switch prevc {
 	case 0:
 		if strings.IndexByte(str, '=') > 0 {
-			ea.parseNamedValue(prevc, str)
+			ea.parseNamedValue(str)
 		} else {
 			ea.rawStyle = str
 			ea.style = parseStyle(str)
@@ -199,7 +199,7 @@ func (ea *elementAttribute) setByPreviousChar(prevc byte, str string) {
 		ea.options = append(ea.options, str)
 	case ',':
 		if strings.IndexByte(str, '=') > 0 {
-			ea.parseNamedValue(prevc, str)
+			ea.parseNamedValue(str)
 		} else {
 			if ea.Attrs == nil {
 				ea.Attrs = make(map[string]string)
diff --git a/element_table.go b/element_table.go
index 2c0fb42..53aaf03 100644
--- a/element_table.go
+++ b/element_table.go
@@ -310,7 +310,7 @@ func parseAttrCols(val string) (ncols int, formats []*columnFormat) {
 // parseToRawRows convert raw table content into multiple raw rows.
 func parseToRawRows(raw []byte) (rows [][]byte) {
 	var (
-		lines [][]byte = bytes.Split(raw, []byte{'\n'})
+		lines = bytes.Split(raw, []byte{'\n'})
 		line  []byte
 	)
 
diff --git a/html_backend.go b/html_backend.go
index f3a285d..94f0ed7 100644
--- a/html_backend.go
+++ b/html_backend.go
@@ -582,8 +582,8 @@ func htmlWriteBlockBegin(el *element, out io.Writer, addClass string) {
 	}
 
 	var (
-		classes string = el.htmlClasses()
-		c       string = strings.TrimSpace(addClass + ` ` + classes)
+		classes = el.htmlClasses()
+		c       = strings.TrimSpace(addClass + ` ` + classes)
 	)
 
 	if len(c) > 0 {
@@ -608,9 +608,7 @@ func htmlWriteBlockAdmonition(el *element, out io.Writer) {
 
 	fmt.Fprint(out, "\n<table>\n<tr>\n<td class=\"icon\">")
 
-	var (
-		iconsFont string = el.Attrs[attrNameIcons]
-	)
+	var iconsFont = el.Attrs[attrNameIcons]
 
 	if iconsFont == attrValueFont {
 		fmt.Fprintf(out, _htmlAdmonitionIconsFont,
@@ -630,8 +628,8 @@ func htmlWriteBlockAdmonition(el *element, out io.Writer) {
 
 func htmlWriteBlockAudio(el *element, out io.Writer) {
 	var (
-		optControls string = ` controls`
-		src         string = el.Attrs[attrNameSrc]
+		optControls = ` controls`
+		src         = el.Attrs[attrNameSrc]
 
 		optAutoplay string
 		optLoop     string
@@ -1078,8 +1076,8 @@ func htmlWriteInlineImage(el *element, out io.Writer) {
 	}
 
 	var (
-		src string = el.Attrs[attrNameSrc]
-		alt string = el.Attrs[attrNameAlt]
+		src = el.Attrs[attrNameSrc]
+		alt = el.Attrs[attrNameAlt]
 
 		width  string
 		height string
@@ -1105,9 +1103,8 @@ func htmlWriteInlineImage(el *element, out io.Writer) {
 }
 
 func htmlWriteInlinePass(doc *Document, el *element, out io.Writer) {
-	var (
-		text []byte = htmlSubs(doc, el)
-	)
+	var text = htmlSubs(doc, el)
+
 	fmt.Fprint(out, string(text))
 }
 
@@ -1139,8 +1136,8 @@ func htmlWriteListDescriptionEnd(el *element, out io.Writer) {
 
 func htmlWriteListOrdered(el *element, out io.Writer) {
 	var (
-		class string = el.getListOrderedClass()
-		tipe  string = el.getListOrderedType()
+		class = el.getListOrderedClass()
+		tipe  = el.getListOrderedType()
 	)
 
 	if len(tipe) > 0 {
@@ -1254,7 +1251,7 @@ func hmltWriteSectionDiscrete(doc *Document, el *element, out io.Writer) {
 
 func htmlWriteTable(doc *Document, el *element, out io.Writer) {
 	var (
-		table *elementTable = el.table
+		table = el.table
 
 		footer *tableRow
 		format *columnFormat
@@ -1305,7 +1302,7 @@ func htmlWriteTable(doc *Document, el *element, out io.Writer) {
 	fmt.Fprint(out, "\n</colgroup>")
 
 	var (
-		rows []*tableRow = table.rows
+		rows = table.rows
 		row  *tableRow
 	)
 
@@ -1504,9 +1501,9 @@ func htmlWriteURLBegin(el *element, out io.Writer) {
 	fmt.Fprintf(out, "<a href=\"%s\"", el.Attrs[attrNameHref])
 
 	var (
-		classes string = el.htmlClasses()
-		target  string = el.Attrs[attrNameTarget]
-		rel     string = el.Attrs[attrNameRel]
+		classes = el.htmlClasses()
+		target  = el.Attrs[attrNameTarget]
+		rel     = el.Attrs[attrNameRel]
 	)
 
 	if len(classes) > 0 {
diff --git a/inline_parser.go b/inline_parser.go
index 0e280d7..d5518e6 100644
--- a/inline_parser.go
+++ b/inline_parser.go
@@ -201,14 +201,12 @@ func (pi *inlineParser) do() {
 				}
 			}
 			if pi.nextc == '"' {
-				if pi.parseQuoteEnd([]byte("`\""),
-					elKindSymbolQuoteDoubleEnd) {
+				if pi.parseQuoteEnd(elKindSymbolQuoteDoubleEnd) {
 					continue
 				}
 			}
 			if pi.nextc == '\'' {
-				if pi.parseQuoteEnd([]byte("`'"),
-					elKindSymbolQuoteSingleEnd) {
+				if pi.parseQuoteEnd(elKindSymbolQuoteSingleEnd) {
 					continue
 				}
 
@@ -399,7 +397,7 @@ func (pi *inlineParser) escape() {
 
 func (pi *inlineParser) parseCrossRef() bool {
 	var (
-		raw []byte = pi.content[pi.x+2:]
+		raw = pi.content[pi.x+2:]
 		idx int
 	)
 
@@ -447,7 +445,7 @@ func (pi *inlineParser) parseCrossRef() bool {
 // parseInlineID parse the ID and optional label between "[[" "]]".
 func (pi *inlineParser) parseInlineID() bool {
 	var (
-		raw []byte = pi.content[pi.x+2:]
+		raw = pi.content[pi.x+2:]
 
 		el       *element
 		stringID string
@@ -490,7 +488,7 @@ func (pi *inlineParser) parseInlineID() bool {
 // "#".
 func (pi *inlineParser) parseInlineIDShort() bool {
 	var (
-		raw []byte = pi.content[pi.x+2:]
+		raw = pi.content[pi.x+2:]
 
 		el       *element
 		stringID string
@@ -537,14 +535,14 @@ func (pi *inlineParser) parseQuoteBegin(quoteEnd []byte, kind int) bool {
 		return false
 	}
 
-	var c byte = pi.content[pi.x+2]
+	var c = pi.content[pi.x+2]
 	if ascii.IsSpace(c) {
 		return false
 	}
 
 	var (
-		raw []byte = pi.content[pi.x+2:]
-		idx int    = bytes.LastIndex(raw, quoteEnd)
+		raw = pi.content[pi.x+2:]
+		idx = bytes.LastIndex(raw, quoteEnd)
 	)
 
 	if idx < 0 {
@@ -564,7 +562,7 @@ func (pi *inlineParser) parseQuoteBegin(quoteEnd []byte, kind int) bool {
 	return true
 }
 
-func (pi *inlineParser) parseQuoteEnd(quoteEnd []byte, kind int) bool {
+func (pi *inlineParser) parseQuoteEnd(kind int) bool {
 	if ascii.IsSpace(pi.prev) {
 		// This is not the end that we looking for.
 		return false
@@ -599,7 +597,7 @@ func (pi *inlineParser) parseFormat(kind int, style int64) bool {
 	}
 
 	var (
-		raw []byte = pi.content[pi.x+1:]
+		raw = pi.content[pi.x+1:]
 
 		el     *element
 		idx    int
@@ -665,7 +663,7 @@ func (pi *inlineParser) parseFormatUnconstrained(
 
 	// Do we have the end format?
 	var (
-		raw []byte = pi.content[pi.x+2:]
+		raw = pi.content[pi.x+2:]
 		el  *element
 	)
 
@@ -828,7 +826,7 @@ func (pi *inlineParser) parsePassthrough() bool {
 
 func (pi *inlineParser) parsePassthroughDouble() bool {
 	var (
-		raw []byte = pi.content[pi.x+2:]
+		raw = pi.content[pi.x+2:]
 		idx int
 		el  *element
 	)
@@ -852,7 +850,7 @@ func (pi *inlineParser) parsePassthroughDouble() bool {
 
 func (pi *inlineParser) parsePassthroughTriple() bool {
 	var (
-		raw []byte = pi.content[pi.x+3:]
+		raw = pi.content[pi.x+3:]
 		idx int
 		el  *element
 	)
@@ -1002,7 +1000,7 @@ func parseURL(doc *Document, scheme string, content []byte) (el *element, n int)
 
 	n = x + idx + 2
 
-	var attr []byte = content[x : x+idx+1]
+	var attr = content[x : x+idx+1]
 	el.style = styleLink
 	el.parseElementAttribute(attr)
 	if len(el.Attrs) == 0 {
@@ -1012,7 +1010,7 @@ func parseURL(doc *Document, scheme string, content []byte) (el *element, n int)
 	}
 	if len(el.rawStyle) >= 1 {
 		var (
-			l int = len(el.rawStyle)
+			l = len(el.rawStyle)
 
 			child *element
 		)
@@ -1030,8 +1028,8 @@ func parseURL(doc *Document, scheme string, content []byte) (el *element, n int)
 
 func (pi *inlineParser) terminate(kind int, style int64) {
 	var (
-		el       *element = pi.current
-		stateTmp          = &inlineParserState{}
+		el       = pi.current
+		stateTmp = &inlineParserState{}
 	)
 
 	for el.parent != nil {
@@ -1111,7 +1109,7 @@ func indexByteUnescape(in []byte, c byte) (out []byte, idx int) {
 
 func indexUnescape(in []byte, token []byte) (out []byte, idx int) {
 	var (
-		tokenLen int = len(token)
+		tokenLen = len(token)
 
 		tmp   []byte
 		x     int
diff --git a/inline_parser_state.go b/inline_parser_state.go
index 783faf6..9f52502 100644
--- a/inline_parser_state.go
+++ b/inline_parser_state.go
@@ -12,7 +12,7 @@ func (pis *inlineParserState) push(c int) {
 }
 
 func (pis *inlineParserState) pop() (c int) {
-	var size int = len(pis.stack)
+	var size = len(pis.stack)
 	if size > 0 {
 		c = pis.stack[size-1]
 		pis.stack = pis.stack[:size-1]
diff --git a/macro.go b/macro.go
index a57f4b3..428da05 100644
--- a/macro.go
+++ b/macro.go
@@ -61,7 +61,7 @@ type macro struct {
 // If macro name and value valid it will return the element for that macro.
 func parseMacroName(textBefore []byte) (macroName string) {
 	var (
-		x int = len(textBefore) - 1
+		x = len(textBefore) - 1
 
 		ok bool
 	)
diff --git a/parser.go b/parser.go
index b497384..a748bde 100644
--- a/parser.go
+++ b/parser.go
@@ -292,7 +292,7 @@ const (
 	symbolUnchecked        = `&#10063;`
 )
 
-var adocStyles map[string]int64 = map[string]int64{
+var adocStyles = map[string]int64{
 	`colophon`:          styleSectionColophon,
 	`abstract`:          styleSectionAbstract,
 	`preface`:           styleSectionPreface,
@@ -330,7 +330,7 @@ var adocStyles map[string]int64 = map[string]int64{
 	`verse`:             styleVerse,
 }
 
-var _attrRef map[string]string = map[string]string{
+var _attrRef = map[string]string{
 	`amp`:            `&`,
 	`apos`:           htmlSymbolSingleQuote, // '
 	`asterisk`:       `*`,
@@ -668,9 +668,7 @@ func parseClosedBracket(input []byte, openb, closedb byte) (out []byte, idx int)
 // parseIDLabel parse the string "ID (,LABEL)" into ID and label.
 // It will return empty id and label if ID is not valid.
 func parseIDLabel(s []byte) (id, label []byte) {
-	var (
-		idLabel [][]byte = bytes.Split(s, []byte(`,`))
-	)
+	var idLabel = bytes.Split(s, []byte(`,`))
 
 	id = idLabel[0]
 	if len(idLabel) >= 2 {
@@ -683,9 +681,7 @@ func parseIDLabel(s []byte) (id, label []byte) {
 }
 
 func parseInlineMarkup(doc *Document, content []byte) (container *element) {
-	var (
-		pi *inlineParser = newInlineParser(doc, content)
-	)
+	var pi = newInlineParser(doc, content)
 
 	pi.do()
 	return pi.container
@@ -818,8 +814,8 @@ func whatKindOfLine(line []byte) (kind int, spaces, got []byte) {
 		kind = lineKindAttribute
 	} else if line[0] == '[' {
 		var (
-			newline []byte = bytes.TrimRight(line, " \t")
-			l       int    = len(newline)
+			newline = bytes.TrimRight(line, " \t")
+			l       = len(newline)
 		)
 
 		if newline[l-1] != ']' {
@@ -843,9 +839,7 @@ func whatKindOfLine(line []byte) (kind int, spaces, got []byte) {
 		}
 		return lineKindAttributeElement, spaces, line
 	} else if line[0] == '=' {
-		var (
-			subs [][]byte = bytes.Fields(line)
-		)
+		var subs = bytes.Fields(line)
 
 		if bytes.Equal(subs[0], []byte(`==`)) {
 			kind = elKindSectionL1
diff --git a/section_counters.go b/section_counters.go
index 8dff0e0..0a5ba86 100644
--- a/section_counters.go
+++ b/section_counters.go
@@ -33,7 +33,7 @@ func (sec *sectionCounters) set(level int) *sectionCounters {
 		sec.nums[level]++
 		sec.curr = level
 	}
-	var clone sectionCounters = *sec
+	var clone = *sec
 	return &clone
 }
 
diff --git a/table_cell.go b/table_cell.go
index ca75cba..2d1627b 100644
--- a/table_cell.go
+++ b/table_cell.go
@@ -17,7 +17,7 @@ func (tc *tableCell) writeByte(b byte) {
 }
 
 func (tc *tableCell) endWithLF() bool {
-	var l int = len(tc.content)
+	var l = len(tc.content)
 	if l == 0 {
 		return false
 	}