From cb339d6ae312d887f03626d174e139c1d3077d74 Mon Sep 17 00:00:00 2001
From: Edo <edoardo.sanguineti222@gmail.com>
Date: Wed, 29 Mar 2023 14:45:50 +0100
Subject: [PATCH] feat(preprocessor): date & time macro (#92)

---
 include/xsk/gsc/preprocessor.hpp |  4 ++++
 include/xsk/stdinc.hpp           |  1 +
 src/gsc/preprocessor.cpp         | 24 +++++++++++++++++++++---
 3 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/include/xsk/gsc/preprocessor.hpp b/include/xsk/gsc/preprocessor.hpp
index bb6daee4..63703242 100644
--- a/include/xsk/gsc/preprocessor.hpp
+++ b/include/xsk/gsc/preprocessor.hpp
@@ -22,6 +22,8 @@ class preprocessor
     std::set<std::string> reject_;
     std::deque<token> tokens_;
     std::vector<token> expr_;
+    std::string date_;
+    std::string time_;
     usize curr_expr_;
     u32 expand_;
     u32 skip_;
@@ -81,6 +83,8 @@ private:
     auto eval_expr_factor() -> i32;
     auto eval_expr_unary() -> i32;
     auto eval_expr_primary() -> i32;
+    auto get_date_define(std::tm* time_p) -> void;
+    auto get_time_define(std::tm* time_p) -> void;
 };
 
 } // namespace xsk::gsc
diff --git a/include/xsk/stdinc.hpp b/include/xsk/stdinc.hpp
index ae4cdc87..797a1376 100644
--- a/include/xsk/stdinc.hpp
+++ b/include/xsk/stdinc.hpp
@@ -6,6 +6,7 @@
 #pragma once
 
 #include <cstdio>
+#include <ctime>
 
 #include <algorithm>
 #include <array>
diff --git a/src/gsc/preprocessor.cpp b/src/gsc/preprocessor.cpp
index da90b9d0..7cf91940 100644
--- a/src/gsc/preprocessor.cpp
+++ b/src/gsc/preprocessor.cpp
@@ -38,6 +38,10 @@ preprocessor::preprocessor(context* ctx, std::string const& name, char const* da
     directives_.insert({ "include", directive::INCLUDE });
     directives_.insert({ "inline", directive::INLINE });
     directives_.insert({ "using_animtree", directive::USINGTREE });
+
+    std::tm l_time = {};
+    get_date_define(&l_time);
+    get_time_define(&l_time);
 }
 
 auto preprocessor::process() -> token
@@ -746,11 +750,11 @@ auto preprocessor::expand(token& tok, define& def) -> void
         }
         else if (tok.data == "__DATE__")
         {
-             tokens_.push_front(token{ token::STRING, tok.space, tok.pos, tok.data }); // TODO!
+             tokens_.push_front(token{ token::STRING, tok.space, tok.pos, date_ });
         }
         else if (tok.data == "__TIME__")
         {
-            tokens_.push_front(token{ token::STRING, tok.space, tok.pos, tok.data }); // TODO!
+            tokens_.push_front(token{ token::STRING, tok.space, tok.pos, time_ });
         }
     }
     else if (def.type == define::OBJECT)
@@ -1320,7 +1324,7 @@ auto preprocessor::eval_expr_primary() -> i32
     if (eval_match(token::INT))
         return static_cast<i32>(std::stoi(eval_prev().data));
     
-    if  (eval_match(token::LPAREN))
+    if (eval_match(token::LPAREN))
     {
         auto val = eval_expr();
         eval_consume(token::RPAREN, "expect ')' after expression.");
@@ -1353,4 +1357,18 @@ auto preprocessor::eval_expr_primary() -> i32
     throw ppr_error(eval_peek().pos, "invalid preprocessor expression");
 }
 
+auto preprocessor::get_date_define(std::tm* time_p) -> void
+{
+    char buf[] = "??? ?? ????";
+    std::strftime(buf, sizeof(buf), "%b %d %Y", time_p);
+    date_ = std::string("\"").append(buf).append("\"");
+}
+
+auto preprocessor::get_time_define(std::tm* time_p) -> void
+{
+    char buf[] = "??:??:??";
+    std::strftime(buf, sizeof(buf), "%T", time_p);
+    time_ = std::string("\"").append(buf).append("\"");
+}
+
 } // namespace xsk::gsc