diff.cxx

// Copyright 2017-2025 Mitchell. See LICENSE.

#include "diff_match_patch.h"

extern "C" {
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
}

/** diff() Lua function. */
static int diff(lua_State *L) {
	diff_match_patch<std::string> dmp;
	auto diffs = dmp.diff_main(luaL_checkstring(L, 1), luaL_checkstring(L, 2), false);
	dmp.diff_cleanupSemantic(diffs);
	lua_createtable(L, diffs.size() * 2, 0);
	int len = 1;
	for (auto &diff : diffs) {
		lua_pushnumber(L, diff.operation), lua_rawseti(L, -2, len++);
		lua_pushstring(L, diff.text.c_str()), lua_rawseti(L, -2, len++);
	}
	return 1;
}

extern "C" {
int luaopen_diff(lua_State *L) { return (lua_pushcfunction(L, diff), 1); }

// Platform-specific Lua library entry points.
LUALIB_API int luaopen_file_diff_diff(lua_State *L) { return luaopen_diff(L); }
LUALIB_API int luaopen_file_diff_diffosx(lua_State *L) { return luaopen_diff(L); }
LUALIB_API int luaopen_file_diff_diffarm(lua_State *L) { return luaopen_diff(L); }
}