1 files changed, 29 insertions, 1 deletions
diff --git a/packages/sol-cov/src/utils.ts b/packages/sol-cov/src/utils.ts
index d970c42ee..7333b2f4d 100644
--- a/packages/sol-cov/src/utils.ts
+++ b/packages/sol-cov/src/utils.ts
@@ -1,4 +1,6 @@
-import { LineColumn, SingleFileSourceRange } from './types';
+import * as _ from 'lodash';
+
+import { ContractData, LineColumn, SingleFileSourceRange } from './types';
 
 export const utils = {
     compareLineColumn(lhs: LineColumn, rhs: LineColumn): number {
@@ -14,4 +16,30 @@ export const utils = {
             utils.compareLineColumn(childRange.end, parentRange.end) <= 0
         );
     },
+    bytecodeToBytecodeRegex(bytecode: string): string {
+        const bytecodeRegex = bytecode
+            // Library linking placeholder: __ConvertLib____________________________
+            .replace(/_.*_/, '.*')
+            // Last 86 characters is solidity compiler metadata that's different between compilations
+            .replace(/.{86}$/, '')
+            // Libraries contain their own address at the beginning of the code and it's impossible to know it in advance
+            .replace(/^0x730000000000000000000000000000000000000000/, '0x73........................................');
+        // HACK: Node regexes can't be longer that 32767 characters. Contracts bytecode can. We jsut truncate the regexes. It's safe in practice.
+        const MAX_REGEX_LENGTH = 32767;
+        const truncatedBytecodeRegex = bytecodeRegex.slice(0, MAX_REGEX_LENGTH);
+        return truncatedBytecodeRegex;
+    },
+    getContractDataIfExists(contractsData: ContractData[], bytecode: string): ContractData | undefined {
+        if (!bytecode.startsWith('0x')) {
+            throw new Error(`0x hex prefix missing: ${bytecode}`);
+        }
+        const contractData = _.find(contractsData, contractDataCandidate => {
+            const bytecodeRegex = utils.bytecodeToBytecodeRegex(contractDataCandidate.bytecode);
+            const runtimeBytecodeRegex = utils.bytecodeToBytecodeRegex(contractDataCandidate.runtimeBytecode);
+            // We use that function to find by bytecode or runtimeBytecode. Those are quasi-random strings so
+            // collisions are practically impossible and it allows us to reuse that code
+            return !_.isNull(bytecode.match(bytecodeRegex)) || !_.isNull(bytecode.match(runtimeBytecodeRegex));
+        });
+        return contractData;
+    },
 };