add some node.js which may be used by lambda

Author: yjhmelody

README.md

@@ -51,4 +51,10 @@ output:
 4
 5
 ***Result: false
+```
+
+```
+code = fs-readFileSync("./demo");
+println(code);
+println(os-arch());
 ```

demo

@@ -23,6 +23,6 @@ println(car(cdr(cdr(x))));            # 3
 println(car(cdr(cdr(cdr(x)))));       # 4
 println(car(cdr(cdr(cdr(cdr(x))))));  # 5
 
-
-code = readFileSync("./demo");
-println(code)
+code = fs-readFileSync("./demo");
+println(code);
+println(os-arch());

index.js

@@ -6,15 +6,26 @@ let parser = require('./src/parser')
 let Environment = require('./src/Environment')
 
 const fs = require('fs')
+const util = require('util')
+const path = require('path')
+const os = require('os')
 
-let globalEnv = new Environment()
-
+const globalEnv = new Environment()
 globalEnv.def('println', (val) => {
     console.log(val)
 })
 
-for (let k in fs){
-    globalEnv.def(k, fs[k])
+register(globalEnv, console, 'console-')
+register(globalEnv, fs, 'fs-')
+register(globalEnv, util, 'util-')
+register(globalEnv, path, 'path-')
+register(globalEnv, os, 'os-')
+
+
+function register(env, obj, prefix = '') {
+    for (let k in obj) {
+        env.def(prefix + k, obj[k])
+    }
 }
 
-module.exports = globalEnv
+module.exports = globalEnv