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neovim/src/lpeg/README.md
Christian Clason 6c96ec8c45 build(deps): vendor lpeg 
Problem: LPeg is hosted on a single unreliable external hoster, forcing
is to mirror it in neovim/deps, which adds maintenance friction. Also,
we have already vendored the Lua `re.lua` module.

Solution: Vendor all of LPeg v1.1.0; as development is not very active
anymore, this should not add much overhead (and allow us to simplify in
particular the Zig build scripts).

Note: LPeg defines a `luaL_newlib` macro for Lua 5.1, which conflicts
with LuaJIT's extension. This requires inlining the macro defined in
`lptypes.h` and used in `lptree.c`; see README.md for the patch.
2026-08-30 10:53:36 +02:00

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LPeg - Parsing Expression Grammars For Lua

For more information, see Lpeg.

Vendored @ v1.1.0 with patch to prevent conflict with LuaJIT extensions:

diff --git a/src/lpeg/lptree.c b/src/lpeg/lptree.c
index 475b0c36bf..94a3171d5a 100644
--- a/src/lpeg/lptree.c
+++ b/src/lpeg/lptree.c
@@ -1388,7 +1388,7 @@ int luaopen_lpeg (lua_State *L) {
   lua_pushnumber(L, MAXBACK);  /* initialize maximum backtracking */
   lua_setfield(L, LUA_REGISTRYINDEX, MAXSTACKIDX);
   luaL_setfuncs(L, metareg, 0);
-  luaL_newlib(L, pattreg);
+  luaL_register(L, "lpeg", pattreg); // Nvim: inline conflicting luaL_newlib macro
   lua_pushvalue(L, -1);
   lua_setfield(L, -3, "__index");
   lua_pushliteral(L, "LPeg " VERSION);
diff --git a/src/lpeg/lptypes.h b/src/lpeg/lptypes.h
index 3f860b973f..98974e1b88 100644
--- a/src/lpeg/lptypes.h
+++ b/src/lpeg/lptypes.h
@@ -35,7 +35,7 @@
 #define lua_rawlen		lua_objlen
 
 #define luaL_setfuncs(L,f,n)	luaL_register(L,NULL,f)
-#define luaL_newlib(L,f)	luaL_register(L,"lpeg",f)
+// #define luaL_newlib(L,f)	luaL_register(L,"lpeg",f) // Nvim: conflicts with LuaJIT
 
 typedef size_t lua_Unsigned;