From eb89926cee2c50ef657b3c033b5637f527d73c6a Mon Sep 17 00:00:00 2001
From: Leonid Logvinov <logvinov.leon@gmail.com>
Date: Mon, 9 Apr 2018 22:23:25 +0200
Subject: Implement the resolver

---
 packages/resolver/src/resolvers/npm_resolver.ts | 34 +++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 packages/resolver/src/resolvers/npm_resolver.ts

(limited to 'packages/resolver/src/resolvers/npm_resolver.ts')

diff --git a/packages/resolver/src/resolvers/npm_resolver.ts b/packages/resolver/src/resolvers/npm_resolver.ts
new file mode 100644
index 000000000..2c0a44aad
--- /dev/null
+++ b/packages/resolver/src/resolvers/npm_resolver.ts
@@ -0,0 +1,34 @@
+import * as fs from 'fs';
+import * as path from 'path';
+
+import { ContractSource } from '../types';
+
+import { Resolver } from './resolver';
+
+export class NPMResolver extends Resolver {
+    private _packagePath: string;
+    constructor(packagePath: string) {
+        super();
+        this._packagePath = packagePath;
+    }
+    public resolveIfExists(importPath: string): ContractSource | undefined {
+        if (!importPath.startsWith('/')) {
+            const [packageName, ...other] = importPath.split('/');
+            const pathWithinPackage = path.join(...other);
+            let currentPath = this._packagePath;
+            const ROOT_PATH = '/';
+            while (currentPath !== ROOT_PATH) {
+                const lookupPath = path.join(currentPath, 'node_modules', packageName, pathWithinPackage);
+                if (fs.existsSync(lookupPath)) {
+                    const fileContent = fs.readFileSync(lookupPath).toString();
+                    return {
+                        source: fileContent,
+                        path: lookupPath,
+                    };
+                }
+                currentPath = path.dirname(currentPath);
+            }
+        }
+        return undefined;
+    }
+}
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