Remove redundant Date.now()

1 files changed, 24 insertions, 0 deletions

diff --git a/packages/sol-cov/src/collect_coverage_entries.ts b/packages/sol-cov/src/collect_coverage_entries.ts
new file mode 100644
index 000000000..d29fa2c37
--- /dev/null
+++ b/packages/sol-cov/src/collect_coverage_entries.ts
@@ -0,0 +1,24 @@
+import * as ethUtil from 'ethereumjs-util';
+import * as fs from 'fs';
+import * as _ from 'lodash';
+import * as path from 'path';
+import * as SolidityParser from 'solidity-parser-sc';
+
+import { ASTVisitor, CoverageEntriesDescription } from './ast_visitor';
+import { getLocationByOffset } from './source_maps';
+
+// Parsing source code for each transaction/code is slow and therefore we cache it
+const coverageEntriesBySourceHash: { [sourceHash: string]: CoverageEntriesDescription } = {};
+
+export const collectCoverageEntries = (contractSource: string, fileName: string) => {
+    const sourceHash = ethUtil.sha3(contractSource).toString('hex');
+    if (_.isUndefined(coverageEntriesBySourceHash[sourceHash])) {
+        const ast = SolidityParser.parse(contractSource);
+        const locationByOffset = getLocationByOffset(contractSource);
+        const astVisitor = new ASTVisitor(locationByOffset);
+        astVisitor.walkAST(ast);
+        coverageEntriesBySourceHash[sourceHash] = astVisitor.getCollectedCoverageEntries();
+    }
+    const coverageEntriesDescription = coverageEntriesBySourceHash[sourceHash];
+    return coverageEntriesDescription;
+};