feat: Add support for Lua 5.1

CMakeLists.txt

@@ -43,7 +43,7 @@ set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/modules")
 include(GNUInstallDirs)
 
 find_package(EditorConfig REQUIRED)
-set(Lua_FIND_VERSION 5.2) # minimum Lua version
+set(Lua_FIND_VERSION 5.1) # minimum Lua version
 find_package(Lua REQUIRED)
 
 set(CMAKE_C_STANDARD 99)

editorconfig-core-scm-1.rockspec

@@ -20,7 +20,7 @@ provides the same functionality as the Editorconfig C Core library.",
     license = "BSD",
 }
 dependencies = {
-    "lua >= 5.2",
+    "lua >= 5.1",
 }
 build = {
     type = "cmake",

editorconfig_lua.c

@@ -6,10 +6,10 @@
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
+ * this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
@@ -36,11 +36,35 @@
 #error "ECL_VERSION is not defined."
 #endif
 
+#if LUA_VERSION_NUM < 502
+/*
+ * Lua 5.1 compatibility functions.
+ * Adapted from Lua 5.2.x source.
+ */
+void
+luaL_setfuncs(lua_State *L, const luaL_Reg *l, int nup)
+{
+    luaL_checkstack(L, nup, "too many upvalues");
+    for (; l->name; l++) {
+        int i;
+        for (i = 0; i < nup; i++)
+            lua_pushvalue(L, -nup);
+        lua_pushcclosure(L, l->func, nup);
+        lua_setfield(L, -(nup + 2), l->name);
+    }
+    lua_pop(L, nup);
+}
+
+#ifndef luaL_newlib
+#define luaL_newlib(L, l) (lua_newtable(L), luaL_setfuncs(L, l, 0))
+#endif
+#endif
+
 /***
  * Lua bindings to the EditorConfig C Core library.
  * @module editorconfig
  */
- 
+
 /* Receives 3 arguments, two optional */
 static editorconfig_handle
 open_ec_handle(lua_State *L)
@@ -94,7 +118,7 @@ lec_parse(lua_State *L)
     editorconfig_handle eh;
     int name_value_count;
     const char *name, *value;
-    lua_Integer idx = 1;
+    lua_Number idx = 1; /* Use lua_Number for Lua 5.1 compatibility */
 
     eh = open_ec_handle(L);
     assert(eh != NULL);
@@ -108,7 +132,7 @@ lec_parse(lua_State *L)
         lua_pushstring(L, name);
         lua_pushstring(L, value);
         lua_settable(L, 1);
-        lua_pushinteger(L, idx);
+        lua_pushnumber(L, idx); /* Use lua_pushnumber for Lua 5.1 compatibility */
         lua_pushstring(L, name);
         lua_settable(L, 2);
         idx += 1;