Improve rule based on code review

Author: armano2

docs/rules/no-extra-space-between-attributes.md

@@ -0,0 +1,31 @@
+# This rule warns about the usage of extra whitespaces between attributes (no-multi-spaces)
+
+The `--fix` option on the command line can automatically fix some of the problems reported by this rule.
+
+This rule aims to remove multiple spaces in a row between attributes witch are not used for indentation.
+
+## Rule Details
+
+Examples of **incorrect** code for this rule:
+
+```html
+<template>
+  <div class="foo"      :style="foo"\t
+    :foo="bar"         >
+  </div>
+</template>
+```
+
+Examples of **correct** code for this rule:
+
+```html
+<template>
+  <div class="foo"
+    :style="foo">
+  </div>
+</template>
+```
+
+### Options
+
+Nothing

docs/rules/no-multi-spaces.md

@@ -28,6 +28,7 @@ function create (context) {
         return
       }
 
+      // TODO: Check `context.parserServices.getTemplateBodyTokenStore` exists or not.
       const sourceCode = context.parserServices.getTemplateBodyTokenStore(context)
       const lastToken = sourceCode.getLastToken(node.startTag)
       if (lastToken.type !== 'HTMLSelfClosingTagClose') {

lib/rules/html-no-self-closing.js

@@ -0,0 +1,73 @@
+/**
+ * @fileoverview This rule warns about the usage of extra whitespaces between attributes
+ * @author Armano
+ */
+'use strict'
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    docs: {
+      description: 'This rule warns about the usage of extra whitespaces between attributes',
+      category: 'Stylistic Issues',
+      recommended: false
+    },
+    fixable: 'whitespace',  // or "code" or "whitespace"
+    schema: []
+  },
+
+  /**
+   * @param {RuleContext} context - The rule context.
+   * @returns {Object} AST event handlers.
+   */
+  create (context) {
+    const sourceCode = context.getSourceCode()
+
+    // ----------------------------------------------------------------------
+    // Public
+    // ----------------------------------------------------------------------
+
+    return {
+      Program (node) {
+        // TODO: Check `context.parserServices.getTemplateBodyTokenStore` exists or not.
+        const tokenStore = context.parserServices.getTemplateBodyTokenStore()
+        const tokens = tokenStore.getTokens(node.templateBody, { includeComments: true })
+
+        let prevToken = tokens.shift()
+        for (const token of tokens) {
+          if (sourceCode.isSpaceBetweenTokens(prevToken, token)) {
+            const text = sourceCode.getText(token, (token.range[0] - prevToken.range[1] + 1), 0)
+
+            const match = text.match(/([^\r\n\t\s])([ \t]+)([>]?)([\n\r]?)/)
+            if (!match) return // there is no errors
+
+            const spaces = match[2].length
+            const requiredSpaces = match[3] === '>' || match[4] !== '' ? 0 : 1
+
+            if (spaces > requiredSpaces) {
+              context.report({
+                node: token,
+                loc: {
+                  start: {
+                    line: prevToken.loc.end.line,
+                    column: prevToken.loc.end.column + requiredSpaces
+                  },
+                  end: {
+                    line: prevToken.loc.end.line,
+                    column: prevToken.loc.end.column + spaces
+                  }
+                },
+                message: 'Extra whitespace detected.',
+                fix: (fixer) => fixer.removeRange([prevToken.range[1] + requiredSpaces, prevToken.range[1] + spaces])
+              })
+            }
+          }
+          prevToken = token
+        }
+      }
+    }
+  }
+}