Enable importing other source files

smnp/program/interpreter.py

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+from smnp.ast.parser import parse
+from smnp.environment.factory import createEnvironment
+from smnp.program.FileReader import readLines
+from smnp.runtime.evaluator import evaluate
+from smnp.token.tokenizer import tokenize
+
+
+class Interpreter:
+
+    @staticmethod
+    def interpretFile(file, printTokens=False, printAst=False):
+        lines = readLines(file)
+
+        tokens = tokenize(lines)
+        if printTokens:
+            print(tokens)
+
+        ast = parse(tokens)
+        if printAst:
+            ast.print()
+
+        environment = createEnvironment()
+
+        evaluate(ast, environment)
+
+        return environment