@0x/sol-compiler: Make source paths in output artifacts nicer if they're within modules.

`@0x/sol-compiler`: Makea Add v0.6 solidity test.

packages/sol-compiler/src/utils/compiler.ts

@@ -315,9 +315,12 @@ function recursivelyGatherDependencySources(
     importRemappings: { [prefix: string]: string },
     compiledImports: CompiledImports,
     visitedAbsolutePaths: { [absPath: string]: boolean } = {},
+    importRootDir?: string,
 ): void {
     if (visitedAbsolutePaths[contractPath]) {
         return;
+    } else {
+        visitedAbsolutePaths[contractPath] = true;
     }
     const contractSource = sourcesByAbsolutePath[contractPath].content;
     const importStatementMatches = contractSource.match(/\nimport[^;]*;/g);
@@ -334,25 +337,30 @@ function recursivelyGatherDependencySources(
 
         let importPath = importPathMatches[1];
         let absPath = importPath;
+        let _importRootDir = importRootDir;
         if (importPath.startsWith('.')) {
             absPath = path.join(contractFolder, importPath);
-            // Express relative imports paths as paths from the root directory.
-            importPath = path.relative(rootDir, absPath);
-            if (!importPath.startsWith('.')) {
-                importPath = `./${importPath}`;
+            if (_importRootDir) {
+                // If there's an `_importRootDir`, we're in a package, so express
+                // the import path as within the package.
+                importPath = path.join(_importRootDir, importPath);
+            } else {
+                // Express relative imports paths as paths from the root directory.
+                importPath = path.relative(rootDir, absPath);
+                if (!importPath.startsWith('.')) {
+                    importPath = `./${importPath}`;
+                }
             }
         } else {
             for (const [prefix, replacement] of Object.entries(importRemappings)) {
                 if (importPath.startsWith(prefix)) {
                     absPath = `${replacement}${importPath.substr(prefix.length)}`;
+                    _importRootDir = path.dirname(importPath);
                     break;
                 }
             }
         }
-
         compiledImports[importPath] = sourcesByAbsolutePath[absPath];
-        visitedAbsolutePaths[absPath] = true;
-
         recursivelyGatherDependencySources(
             absPath,
             rootDir,
@@ -360,6 +368,7 @@ function recursivelyGatherDependencySources(
             importRemappings,
             compiledImports,
             visitedAbsolutePaths,
+            _importRootDir,
         );
     }
 }

packages/sol-compiler/test/compiler_test.ts

@@ -26,7 +26,7 @@ describe('#Compiler', function(): void {
     it('should create a Compiler with empty opts', async () => {
         const _compiler = new Compiler(); // tslint:disable-line no-unused-variable
     });
-    it('should create an Exchange artifact with the correct unlinked binary', async () => {
+    it.only('should create an Exchange artifact with the correct unlinked binary', async () => {
         compilerOpts.contracts = ['Exchange'];
 
         const exchangeArtifactPath = `${artifactsDir}/Exchange.json`;
@@ -114,4 +114,22 @@ describe('#Compiler', function(): void {
             expect(artifact).to.equal('EmptyContract.json');
         }
     });
+    it('should compile a V0.6 contract', async () => {
+        compilerOpts.contracts = ['V6Contract'];
+
+        const artifactPath = `${artifactsDir}/V6Contract.json`;
+        if (fsWrapper.doesPathExistSync(artifactPath)) {
+            await fsWrapper.removeFileAsync(artifactPath);
+        }
+
+        await new Compiler(compilerOpts).compileAsync();
+
+        const opts = {
+            encoding: 'utf8',
+        };
+        const exchangeArtifactString = await fsWrapper.readFileAsync(artifactPath, opts);
+        const exchangeArtifact: ContractArtifact = JSON.parse(exchangeArtifactString);
+        const bin = exchangeArtifact.compilerOutput.evm.bytecode.object;
+        expect(bin.slice(2)).to.length.to.be.gt(0);
+    });
 });

packages/sol-compiler/test/fixtures/contracts/V6Contract.sol

@@ -0,0 +1,37 @@
+/*
+
+  Copyright 2020 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.6.4;
+
+
+contract V6Contract {
+
+    uint256 private _privateNumber;
+
+    constructor(uint256 privateNumber) public {
+        _privateNumber = privateNumber;
+    }
+
+    fallback() external {
+        revert('nope');
+    }
+
+    receive() payable external {
+        // no-op
+    }
+}