From 72ef40e6718cbe309a8fe6f32ac31adb1a40dda2 Mon Sep 17 00:00:00 2001
From: Aryadev Chavali <aryadev@aryadevchavali.com>
Date: Sun, 14 Apr 2024 17:22:34 +0630
Subject: parser -> preprocesser + parser

I've decided to split the module parsing into two modules, one for the
preprocessing stage which only deals with tokens and the parsing stage
which generates bytecode.
---
 Makefile             |  2 +-
 asm/preprocesser.cpp | 13 +++++++++++++
 asm/preprocesser.hpp | 39 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 asm/preprocesser.cpp
 create mode 100644 asm/preprocesser.hpp

diff --git a/Makefile b/Makefile
index e0c076b..609fc40 100644
--- a/Makefile
+++ b/Makefile
@@ -35,7 +35,7 @@ VM_OUT=$(DIST)/ovm.out
 ## ASSEMBLY setup
 ASM_DIST=$(DIST)/asm
 ASM_SRC=asm
-ASM_CODE:=$(addprefix $(ASM_SRC)/, lexer.cpp)
+ASM_CODE:=$(addprefix $(ASM_SRC)/, lexer.cpp, preprocesser.cpp)
 ASM_OBJECTS:=$(ASM_CODE:$(ASM_SRC)/%.cpp=$(ASM_DIST)/%.o)
 ASM_DEPS:=$(ASM_OBJECTS:%.o=%.d) $(ASM_DIST)/main.d
 ASM_CFLAGS=$(CPPFLAGS)
diff --git a/asm/preprocesser.cpp b/asm/preprocesser.cpp
new file mode 100644
index 0000000..615cf93
--- /dev/null
+++ b/asm/preprocesser.cpp
@@ -0,0 +1,13 @@
+/* Copyright (C) 2024 Aryadev Chavali
+
+ * You may distribute and modify this code under the terms of the
+ * GPLv2 license.  You should have received a copy of the GPLv2
+ * license with this file.  If not, please write to:
+ * aryadev@aryadevchavali.com.
+
+ * Created: 2024-04-14
+ * Author: Aryadev Chavali
+ * Description: Preprocessor which occurs after lexing before parsing.
+ */
+
+#include "./preprocesser.hpp"
diff --git a/asm/preprocesser.hpp b/asm/preprocesser.hpp
new file mode 100644
index 0000000..9d733dd
--- /dev/null
+++ b/asm/preprocesser.hpp
@@ -0,0 +1,39 @@
+/* Copyright (C) 2024 Aryadev Chavali
+
+ * You may distribute and modify this code under the terms of the GPLv2
+ * license.  You should have received a copy of the GPLv2 license with
+ * this file.  If not, please write to: aryadev@aryadevchavali.com.
+
+ * Created: 2024-04-14
+ * Author: Aryadev Chavali
+ * Description: Preprocessor which occurs after lexing before parsing.
+ */
+
+#ifndef PREPROCESSER_HPP
+#define PREPROCESSER_HPP
+
+#include <tuple>
+
+#include "./lexer.hpp"
+
+enum pp_err_t
+{
+  OK = 0,
+  EXPECTED_NAME,
+  EXPECTED_STRING,
+  EXPECTED_END,
+  FILE_NONEXISTENT,
+  FILE_PARSE_ERROR,
+  UNKNOWN_NAME,
+};
+
+std::pair<std::vector<token_t>, pp_err_t>
+preprocesser(const std::vector<token_t> &);
+
+std::pair<std::vector<token_t>, pp_err_t>
+preprocess_macro_blocks(const std::vector<token_t> &);
+
+std::pair<std::vector<token_t>, pp_err_t>
+preprocess_use_blocks(const std::vector<token_t> &);
+
+#endif
-- 
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