✨ 支持 ==mark== 高亮语法 #84

ast/node.go

@@ -446,5 +446,10 @@ const (
 	NodeBlockRefSpace NodeType = 432 // 内容块 ID 和内容块文本之间的空格
 	NodeBlockRefText  NodeType = 433 // 内容块文本
 
+	// 支持 ==mark== 高亮语法 https://github.com/88250/lute/issues/84
+	NodeMark            NodeType = 450 // 标记
+	NodeMarkOpenMarker  NodeType = 451 // 开始标记标记符 ==
+	NodeMarkCloseMarker NodeType = 452 // 结束标记标记符 ==
+
 	NodeTypeMaxVal NodeType = 1024 // 节点类型最大值
 )

lute.go

@@ -99,6 +99,7 @@ func NewOptions() *parse.Options {
 		ChineseParagraphBeginningSpace: false,
 		YamlFrontMatter:                true,
 		BlockRef:                       false,
+		Mark:                           false,
 	}
 }
 
@@ -324,6 +325,10 @@ func (lute *Lute) SetBlockRef(b bool) {
 	lute.BlockRef = b
 }
 
+func (lute *Lute) SetMark(b bool) {
+	lute.Mark = b
+}
+
 func (lute *Lute) SetJSRenderers(options map[string]map[string]*js.Object) {
 	for rendererType, extRenderer := range options["renderers"] {
 		switch extRenderer.Interface().(type) { // 稍微进行一点格式校验

parse/delimiter.go

@@ -122,7 +122,9 @@ func (t *Tree) processEmphasis(stackBottom *delimiter, ctx *InlineContext) {
 			openerInl = opener.node
 			closerInl = closer.node
 
-			if t.Context.Option.GFMStrikethrough && lex.ItemTilde == closercc && opener.num != closer.num {
+			if ((t.Context.Option.GFMStrikethrough && lex.ItemTilde == closercc) ||
+				t.Context.Option.Mark && lex.ItemEqual == closercc) &&
+				opener.num != closer.num {
 				break
 			}
 
@@ -171,6 +173,12 @@ func (t *Tree) processEmphasis(stackBottom *delimiter, ctx *InlineContext) {
 						openMarker.Type = ast.NodeStrikethrough2OpenMarker
 						closeMarker.Type = ast.NodeStrikethrough2CloseMarker
 					}
+				} else if lex.ItemEqual == closercc {
+					if t.Context.Option.Mark {
+						emStrongDel.Type = ast.NodeMark
+						openMarker.Type = ast.NodeMarkOpenMarker
+						closeMarker.Type = ast.NodeMarkCloseMarker
+					}
 				}
 			}
 

parse/inline.go

@@ -31,7 +31,7 @@ func (t *Tree) parseInline(block *ast.Node, ctx *InlineContext) {
 			n = t.parseBackslash(block, ctx)
 		case lex.ItemBacktick:
 			n = t.parseCodeSpan(block, ctx)
-		case lex.ItemAsterisk, lex.ItemUnderscore, lex.ItemTilde:
+		case lex.ItemAsterisk, lex.ItemUnderscore, lex.ItemTilde, lex.ItemEqual:
 			t.handleDelim(block, ctx)
 		case lex.ItemNewline:
 			n = t.parseNewline(block, ctx)

parse/parse.go

@@ -283,6 +283,8 @@ type Options struct {
 	YamlFrontMatter bool
 	// BlockRef 设置是否开启内容块引用支持。
 	BlockRef bool
+	// Mark 设置是否打开“==标记==”支持。
+	Mark bool
 }
 
 func (context *Context) ParentTip() {

parse/text.go

@@ -33,7 +33,7 @@ func (t *Tree) parseText(ctx *InlineContext) *ast.Node {
 func (t *Tree) isMarker(token byte) bool {
 	switch token {
 	case lex.ItemAsterisk, lex.ItemUnderscore, lex.ItemOpenBracket, lex.ItemBang, lex.ItemNewline, lex.ItemBackslash, lex.ItemBacktick, lex.ItemLess,
-		lex.ItemCloseBracket, lex.ItemAmpersand, lex.ItemTilde, lex.ItemDollar, lex.ItemOpenCurlyBrace, lex.ItemOpenParen:
+		lex.ItemCloseBracket, lex.ItemAmpersand, lex.ItemTilde, lex.ItemDollar, lex.ItemOpenCurlyBrace, lex.ItemOpenParen, lex.ItemEqual:
 		return true
 	default:
 		return false

pprof/main.go

@@ -37,6 +37,8 @@ func main() {
 	luteEngine.FixTermTypo = false
 	luteEngine.ChinesePunct = false
 	luteEngine.Emoji = false
+	luteEngine.BlockRef = false
+	luteEngine.Mark = false
 
 	cpuProfile, _ := os.Create("pprof/cpu_profile")
 	pprof.StartCPUProfile(cpuProfile)

test/mark_test.go

@@ -0,0 +1,33 @@
+// Lute - 一款对中文语境优化的 Markdown 引擎，支持 Go 和 JavaScript
+// Copyright (c) 2019-present, b3log.org
+//
+// Lute is licensed under Mulan PSL v2.
+// You can use this software according to the terms and conditions of the Mulan PSL v2.
+// You may obtain a copy of Mulan PSL v2 at:
+//         http://license.coscl.org.cn/MulanPSL2
+// THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+// See the Mulan PSL v2 for more details.
+
+package test
+
+import (
+	"github.com/88250/lute"
+	"testing"
+)
+
+var markTests = []parseTest{
+
+	{"0", "==foo==\n", "<h2 id=\"foo\">foo</h2>\n"},
+}
+
+func TestMark(t *testing.T) {
+	luteEngine := lute.New()
+	luteEngine.Mark = true
+
+	for _, test := range markTests {
+		html := luteEngine.MarkdownStr(test.name, test.from)
+		if test.to != html {
+			t.Fatalf("test case [%s] failed\nexpected\n\t%q\ngot\n\t%q\noriginal markdown text\n\t%q", test.name, test.to, html, test.from)
+		}
+	}
+}