Added FileReader to stdlib

Added FileReader to stdlib to read in files and return it as a string

.gitignore

@@ -30,4 +30,5 @@ bin/
 
 .class
 /src/*.jar
-/.idea
+/.idea
+hello_world.froj

hello_world.froj

@@ -1,4 +1,3 @@
+var string = fileReader("..eogm");
 
-
-
-print "Hello world!";
+print string;

src/com/jsaasta/froj/Froj.java

@@ -74,7 +74,7 @@ public class Froj {
 
     }
 
-    static void error(int line, String message) {
+    public static void error(int line, String message) {
         report(line, "", message);
     }
 

src/com/jsaasta/froj/stdlib/Clock.java

@@ -5,6 +5,9 @@ import com.jsaasta.froj.Interpreter;
 
 import java.util.List;
 
+/**
+ * @return Returns current time in nanoSeconds / 1000;
+ */
 public class Clock implements FrojCallable {
 
     @Override
@@ -14,7 +17,7 @@ public class Clock implements FrojCallable {
 
     @Override
     public Object call(Interpreter interpreter, List<Object> arguments) {
-        return (double) System.currentTimeMillis() / 1000.0;
+        return (double) System.nanoTime() / 1000.0;
     }
 
     @Override

src/com/jsaasta/froj/stdlib/FileReader.java

@@ -0,0 +1,29 @@
+package com.jsaasta.froj.stdlib;
+
+import com.jsaasta.froj.Froj;
+import com.jsaasta.froj.FrojCallable;
+import com.jsaasta.froj.Interpreter;
+
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.List;
+
+public class FileReader implements FrojCallable {
+    @Override
+    public int arity() {
+        return 1;
+    }
+
+    @Override
+    public Object call(Interpreter interpreter, List<Object> arguments) {
+
+        try {
+            byte[] bytes = Files.readAllBytes(Paths.get((String) arguments.get(0)));
+            return new String(bytes, Charset.defaultCharset());
+        } catch (IOException e) {
+           throw new StdlibRuntimeError("Couldn't find file: " + arguments.get(0));
+        }
+    }
+}

src/com/jsaasta/froj/stdlib/Stdlib.java

@@ -11,6 +11,7 @@ public class Stdlib {
         classes = new HashMap<>();
         classes.put("clock", new Clock());
         classes.put("input", new Input());
+        classes.put("fileReader", new FileReader());
     }
 
     public static Map<String, Object> define(){

src/com/jsaasta/froj/stdlib/StdlibRuntimeError.java

@@ -0,0 +1,11 @@
+package com.jsaasta.froj.stdlib;
+
+import com.jsaasta.froj.Token;
+
+public class StdlibRuntimeError extends RuntimeException{
+
+
+    public StdlibRuntimeError(String message) {
+        super(message, null, false, false);
+    }
+}