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+REPL
+====
+
+REPL, as it's name suggest, is function implementing endless loop with
+following actions:
+
+    * read
+
+        First step is reading data from input stream.
+
+    * evaluate
+
+        Data that was read from input stream represent expression that
+        should be evaluated by interpreter.
+
+    * print
+
+        Once evaluation finishes, result of evaluation is written to
+        output stream. In case resulting data is ``()``, print step is
+        skipped.
+
+This loop is stopped only in case closing of input or output stream is
+detected.
+
+
+Source code
+-----------
+
+repl.h
+''''''
+
+.. literalinclude:: ../src_c/repl.h
+    :language: c
+
+
+repl.c
+''''''
+
+.. literalinclude:: ../src_c/repl.c
+    :language: c