Fixed wrong autofix when properties on the same line in new-line-between-multi-line-property. (#1378)

I also improved the position of the report.

Author: ota-meshi

lib/rules/new-line-between-multi-line-property.js

@@ -5,6 +5,46 @@
 'use strict'
 
 const utils = require('../utils')
+
+/**
+ * @param {Token} node
+ */
+function isComma(node) {
+  return node.type === 'Punctuator' && node.value === ','
+}
+
+/**
+ * Check whether the between given nodes has empty line.
+ * @param {SourceCode} sourceCode
+ * @param {ASTNode} pre
+ * @param {ASTNode} cur
+ */
+function* iterateBetweenTokens(sourceCode, pre, cur) {
+  yield sourceCode.getLastToken(pre)
+  yield* sourceCode.getTokensBetween(pre, cur, {
+    includeComments: true
+  })
+  yield sourceCode.getFirstToken(cur)
+}
+
+/**
+ * Check whether the between given nodes has empty line.
+ * @param {SourceCode} sourceCode
+ * @param {ASTNode} pre
+ * @param {ASTNode} cur
+ */
+function hasEmptyLine(sourceCode, pre, cur) {
+  /** @type {Token|null} */
+  let preToken = null
+  for (const token of iterateBetweenTokens(sourceCode, pre, cur)) {
+    if (preToken && token.loc.start.line - preToken.loc.end.line >= 2) {
+      return true
+    }
+    preToken = token
+  }
+  return false
+}
+
 // ------------------------------------------------------------------------------
 // Rule Definition
 // ------------------------------------------------------------------------------
@@ -35,9 +75,6 @@ module.exports = {
 
   /** @param {RuleContext} context */
   create(context) {
-    // always insert one line
-    const insertLine = 1
-
     let minLineOfMultilineProperty = 2
     if (
       context.options &&
@@ -71,42 +108,44 @@ module.exports = {
             const cur = properties[i]
             const pre = properties[i - 1]
 
-            const leadingComments = sourceCode
-              .getTokensBetween(pre, cur, { includeComments: true })
-              .filter((token) => ['Line', 'Block'].includes(token.type))
             const lineCountOfPreProperty =
               pre.loc.end.line - pre.loc.start.line + 1
-            let curStartLine = cur.loc.start.line
-            if (leadingComments.length) {
-              curStartLine = leadingComments[0].loc.start.line
+            if (lineCountOfPreProperty < minLineOfMultilineProperty) {
+              continue
+            }
+
+            if (hasEmptyLine(sourceCode, pre, cur)) {
+              continue
             }
-            const lineCountBetweenCurAndPreProperty =
-              curStartLine - pre.loc.end.line - 1
-            if (
-              lineCountOfPreProperty >= minLineOfMultilineProperty &&
-              lineCountBetweenCurAndPreProperty < insertLine
-            ) {
-              context.report({
-                node: pre,
-                loc: pre.loc,
-                message:
-                  'Enforce new lines between multi-line properties in Vue components.',
-                fix(fixer) {
-                  let firstPositionOfLine = cur.range[0] - cur.loc.start.column
-                  if (leadingComments.length) {
-                    const firstComment = leadingComments[0]
-                    firstPositionOfLine =
-                      firstComment.range[0] - firstComment.loc.start.column
+
+            context.report({
+              node: pre,
+              loc: {
+                start: pre.loc.end,
+                end: cur.loc.start
+              },
+              message:
+                'Enforce new lines between multi-line properties in Vue components.',
+              fix(fixer) {
+                /** @type {Token|null} */
+                let preToken = null
+                for (const token of iterateBetweenTokens(
+                  sourceCode,
+                  pre,
+                  cur
+                )) {
+                  if (
+                    preToken &&
+                    preToken.loc.end.line < token.loc.start.line
+                  ) {
+                    return fixer.insertTextAfter(preToken, '\n')
                   }
-                  // this action equal to insert number of line before node
-                  return fixer.insertTextAfterRange(
-                    [firstPositionOfLine, firstPositionOfLine],
-                    '\n'
-                    // to avoid conflict with no-multiple-empty-lines, only insert one newline
-                  )
+                  preToken = token
                 }
-              })
-            }
+                const commaToken = sourceCode.getTokenAfter(pre, isComma)
+                return fixer.insertTextAfter(commaToken || pre, '\n\n')
+              }
+            })
           }
         }
       })