1 files changed, 107 insertions, 0 deletions
diff --git a/packages/sol-compiler/src/utils/compiler.ts b/packages/sol-compiler/src/utils/compiler.ts
new file mode 100644
index 000000000..c571b2581
--- /dev/null
+++ b/packages/sol-compiler/src/utils/compiler.ts
@@ -0,0 +1,107 @@
+import { ContractSource, ContractSources } from '@0xproject/sol-resolver';
+import { logUtils } from '@0xproject/utils';
+import * as _ from 'lodash';
+import * as path from 'path';
+import * as solc from 'solc';
+
+import { constants } from './constants';
+import { fsWrapper } from './fs_wrapper';
+import { ContractArtifact } from './types';
+
+/**
+ * Gets contract data on network or returns if an artifact does not exist.
+ * @param artifactsDir Path to the artifacts directory.
+ * @param contractName Name of contract.
+ * @return Contract data on network or undefined.
+ */
+export async function getContractArtifactIfExistsAsync(
+    artifactsDir: string,
+    contractName: string,
+): Promise<ContractArtifact | void> {
+    let contractArtifact;
+    const currentArtifactPath = `${artifactsDir}/${contractName}.json`;
+    try {
+        const opts = {
+            encoding: 'utf8',
+        };
+        const contractArtifactString = await fsWrapper.readFileAsync(currentArtifactPath, opts);
+        contractArtifact = JSON.parse(contractArtifactString);
+        return contractArtifact;
+    } catch (err) {
+        logUtils.log(`Artifact for ${contractName} does not exist`);
+        return undefined;
+    }
+}
+
+/**
+ * Creates a directory if it does not already exist.
+ * @param artifactsDir Path to the directory.
+ */
+export async function createDirIfDoesNotExistAsync(dirPath: string): Promise<void> {
+    if (!fsWrapper.doesPathExistSync(dirPath)) {
+        logUtils.log(`Creating directory at ${dirPath}...`);
+        await fsWrapper.mkdirAsync(dirPath);
+    }
+}
+
+/**
+ * Searches Solidity source code for compiler version range.
+ * @param  source Source code of contract.
+ * @return Solc compiler version range.
+ */
+export function parseSolidityVersionRange(source: string): string {
+    const SOLIDITY_VERSION_RANGE_REGEX = /pragma\s+solidity\s+(.*);/;
+    const solcVersionRangeMatch = source.match(SOLIDITY_VERSION_RANGE_REGEX);
+    if (_.isNull(solcVersionRangeMatch)) {
+        throw new Error('Could not find Solidity version range in source');
+    }
+    const solcVersionRange = solcVersionRangeMatch[1];
+    return solcVersionRange;
+}
+
+/**
+ * Normalizes the path found in the error message.
+ * Example: converts 'base/Token.sol:6:46: Warning: Unused local variable'
+ *          to 'Token.sol:6:46: Warning: Unused local variable'
+ * This is used to prevent logging the same error multiple times.
+ * @param  errMsg An error message from the compiled output.
+ * @return The error message with directories truncated from the contract path.
+ */
+export function getNormalizedErrMsg(errMsg: string): string {
+    const SOLIDITY_FILE_EXTENSION_REGEX = /(.*\.sol)/;
+    const errPathMatch = errMsg.match(SOLIDITY_FILE_EXTENSION_REGEX);
+    if (_.isNull(errPathMatch)) {
+        throw new Error('Could not find a path in error message');
+    }
+    const errPath = errPathMatch[0];
+    const baseContract = path.basename(errPath);
+    const normalizedErrMsg = errMsg.replace(errPath, baseContract);
+    return normalizedErrMsg;
+}
+
+/**
+ * Parses the contract source code and extracts the dendencies
+ * @param  source Contract source code
+ * @return List of dependendencies
+ */
+export function parseDependencies(contractSource: ContractSource): string[] {
+    // TODO: Use a proper parser
+    const source = contractSource.source;
+    const IMPORT_REGEX = /(import\s)/;
+    const DEPENDENCY_PATH_REGEX = /"([^"]+)"/; // Source: https://github.com/BlockChainCompany/soljitsu/blob/master/lib/shared.js
+    const dependencies: string[] = [];
+    const lines = source.split('\n');
+    _.forEach(lines, line => {
+        if (!_.isNull(line.match(IMPORT_REGEX))) {
+            const dependencyMatch = line.match(DEPENDENCY_PATH_REGEX);
+            if (!_.isNull(dependencyMatch)) {
+                let dependencyPath = dependencyMatch[1];
+                if (dependencyPath.startsWith('.')) {
+                    dependencyPath = path.join(path.dirname(contractSource.path), dependencyPath);
+                }
+                dependencies.push(dependencyPath);
+            }
+        }
+    });
+    return dependencies;
+}