add no-trailing-punctuation, fix #18

README.md

@@ -56,6 +56,7 @@ lint-md README.md Document.md
 | no-space-in-emphasis | emphasis 内容前后不能有空格 | 删除 emphasis 内容中的前后空格即可 |
 | no-space-in-link | link 内容前后不能有空格 | 删除 link 内容中的前后空格即可 |
 | no-multiple-space-blockquote | blockquote 语法不能包含有多个空格 | 删除 blockquote 内容中多余的空格 |
+| no-trailing-punctuation | 标题不能以标点符号结尾 | 删除标题最后的标点符号 |
 
 
 > 目前仅仅检查了比较通用的类型，**欢迎 pull request**，在 `rules` 中增加自己的规则，开发约束：

__tests__/rules/no-trailing-punctuation.spec.js

@@ -0,0 +1,19 @@
+const lint = require('../lint');
+
+describe('no-trailing-punctuation', () => {
+  test('success', () => {
+    const md = `## header 2`;
+    expect(lint(md)).toEqual([]);
+  });
+
+  test('fail', () => {
+    const md = `### header 3**!**`;
+    expect(lint(md)).toEqual([{
+      column: 1,
+      level: 'error',
+      line: 1,
+      text: `Header content can not end with symbol: 'header 3!'`,
+      type: 'no-trailing-punctuation'
+    }]);
+  });
+});

rules/index.js

@@ -15,7 +15,8 @@ const PluginClasses = [
   require('./no-fullwidth-number'),
   require('./no-space-in-emphasis'),
   require('./no-space-in-link'),
-  require('./no-multiple-space-blockquote')
+  require('./no-multiple-space-blockquote'),
+  require('./no-trailing-punctuation')
 ];
 
 

rules/no-trailing-punctuation.js

@@ -0,0 +1,38 @@
+const { Plugin } = require('ast-plugin');
+const _ = require('lodash');
+const { astToText } = require('./helper/ast');
+
+const Symbols = '.,;:!?。，；：！？…';
+
+/**
+ * Header 内容不能以标点符号结尾
+ * no-trailing-punctuation
+ */
+module.exports = class extends Plugin {
+
+  static get type() {
+    return 'no-trailing-punctuation';
+  };
+
+  pre() {}
+
+  visitor() {
+    return {
+      heading: ast => {
+        const text = astToText(ast.node);
+        const line = ast.node.position.start.line;
+        const column = ast.node.position.start.column;
+
+        if (_.includes(Symbols, _.last(_.trimEnd(text)))) {
+          this.cfg.throwError({
+            line,
+            column,
+            text: `Header content can not end with symbol: '${text}'`,
+          });
+        }
+      },
+    }
+  }
+
+  post() {}
+};

tests/no-trailing-punctuation.md

@@ -0,0 +1 @@
+### header 3**!**