Adding support for storage layout

package.json

@@ -90,27 +90,27 @@
     "@babel/code-frame": "^7.26.2",
     "c8": "^10.1.3",
     "cross-env": "^7.0.3",
-    "eslint": "^8.47.0",
+    "eslint": "^8.57.1",
     "eslint-config-airbnb-base": "^15.0.0",
-    "eslint-config-prettier": "^10.0.1",
+    "eslint-config-prettier": "^10.1.2",
     "eslint-plugin-import": "^2.31.0",
     "esm-utils": "^4.3.0",
-    "esmock": "^2.6.9",
+    "esmock": "^2.7.0",
     "jest": "^29.7.0",
-    "jest-light-runner": "^0.7.0",
-    "jest-snapshot-serializer-ansi": "^2.1.0",
+    "jest-light-runner": "^0.7.8",
+    "jest-snapshot-serializer-ansi": "^2.2.1",
     "jest-snapshot-serializer-raw": "^2.0.0",
     "jest-watch-typeahead": "^2.2.2",
     "lines-and-columns": "^2.0.4",
-    "prettier": "^3.3.3",
+    "prettier": "^3.5.3",
     "proxyquire": "^2.1.3",
-    "solc": "^0.8.28",
-    "webpack": "^5.97.1",
+    "solc": "^0.8.29",
+    "webpack": "^5.99.6",
     "webpack-cli": "^6.0.1"
   },
   "dependencies": {
-    "@solidity-parser/parser": "^0.19.0",
-    "semver": "^7.6.3"
+    "@solidity-parser/parser": "^0.20.1",
+    "semver": "^7.7.1"
   },
   "peerDependencies": {
     "prettier": ">=2.3.0"

src/comments/handlers/handleContractDefinitionComments.js

@@ -27,10 +27,19 @@ function handleContractDefinitionComments({
   );
 
   // The comment is behind the start of the Block `{}` or behind a base contract
-  if (followingNode?.type === 'InheritanceSpecifier' || nextCharacter === '{') {
+  if (
+    (followingNode &&
+      (followingNode.type === 'InheritanceSpecifier' ||
+        followingNode === enclosingNode.storageLayout)) ||
+    nextCharacter === '{'
+  ) {
     // In this scenario the comment belongs to a base contract.
     //   contract A is B, /* comment for B */ C /* comment for C */ {}
-    if (precedingNode?.type === 'InheritanceSpecifier') {
+    if (
+      precedingNode &&
+      (precedingNode.type === 'InheritanceSpecifier' ||
+        precedingNode === enclosingNode.storageLayout)
+    ) {
       addTrailingComment(precedingNode, comment);
       return true;
     }

src/nodes/ContractDefinition.js

@@ -6,17 +6,37 @@ import {
   printSeparatedList
 } from '../common/printer-helpers.js';
 
-const { group, line, hardline } = doc.builders;
+const { group, hardline, ifBreak, line, softline } = doc.builders;
 
-const inheritance = (node, path, print) =>
-  node.baseContracts.length > 0
-    ? [
-        ' is',
-        printSeparatedList(path.map(print, 'baseContracts'), {
-          firstSeparator: line
-        })
-      ]
-    : line;
+const specifiers = (node, path, print) => {
+  const document = [];
+  if (node.baseContracts.length > 0) {
+    document.push([
+      'is',
+      printSeparatedList(path.map(print, 'baseContracts'), {
+        firstSeparator: line
+      })
+    ]);
+  }
+  if (node.storageLayout) {
+    document.push([
+      'layout at',
+      printSeparatedItem(path.call(print, 'storageLayout'), {
+        firstSeparator: line
+      })
+    ]);
+  }
+  if (document.length === 0) return line;
+  if (document.length === 1) return [' ', document];
+  const groupId = Symbol('ContractSpecifiers.inheritance');
+  return printSeparatedList(
+    [group(document[0], { id: groupId }), document[1]],
+    {
+      firstSeparator: line,
+      separator: ifBreak('', softline, { groupId })
+    }
+  );
+};
 
 const body = (node, path, options, print) => {
   const comments = printComments(node, path, options);
@@ -34,7 +54,7 @@ export const ContractDefinition = {
       node.kind === 'abstract' ? 'abstract contract' : node.kind,
       ' ',
       node.name,
-      inheritance(node, path, print),
+      specifiers(node, path, print),
       '{'
     ]),
     body(node, path, options, print),

tests/format/Comments/Comments.sol

@@ -38,6 +38,18 @@ contract Comments4 is Interface1, Interface2, Interface3, Interface4, Interface5
   // solhint-disable-previous-line no-empty-blocks
 }
 
+contract Comments4a is Interface1, Interface2, Interface3, Interface4, Interface5, Interface6 /*why we used Interface6*/ layout /*where should this go?*/at 123/*why we used this layout*/ {
+  // solhint-disable-previous-line no-empty-blocks
+}
+
+contract Comments4b is Interface1, Interface2, Interface3, Interface4, Interface5, Interface6 /*why we used Interface6*/ layout /*where should this go?*/at 123 + 456/*why we used this layout*/ {
+  // solhint-disable-previous-line no-empty-blocks
+}
+
+contract Comments4c is Interface1, Interface2, Interface3, Interface4, Interface5, Interface6 /*why we used Interface6*/ layout /*where should this go?*/at f(123 + 456)/*why we used this layout*/ {
+  // solhint-disable-previous-line no-empty-blocks
+}
+
 contract Comments5 /*nice name*/ {
   // solhint-disable-previous-line no-empty-blocks
 }