Aegisub/libaegisub/lua/utils.cpp

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// Copyright (c) 2014, Thomas Goyne <plorkyeran@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// Aegisub Project http://www.aegisub.org/
#include "libaegisub/lua/utils.h"
#include "libaegisub/log.h"
#include <boost/algorithm/string/join.hpp>
#include <boost/algorithm/string/predicate.hpp>
#include <boost/format.hpp>
#include <boost/range/adaptor/reversed.hpp>
#include <boost/regex.hpp>
#ifdef _MSC_VER
// Disable warnings for noreturn functions having return types
#pragma warning(disable: 4645 4646)
#endif
namespace agi { namespace lua {
std::string get_string_or_default(lua_State *L, int idx) {
size_t len = 0;
const char *str = lua_tolstring(L, idx, &len);
if (!str)
return "<not a string>";
return std::string(str, len);
}
std::string get_string(lua_State *L, int idx) {
size_t len = 0;
const char *str = lua_tolstring(L, idx, &len);
return std::string(str ? str : "", len);
}
std::string get_global_string(lua_State *L, const char *name) {
lua_getglobal(L, name);
std::string ret;
if (lua_isstring(L, -1))
ret = lua_tostring(L, -1);
lua_pop(L, 1);
return ret;
}
std::string check_string(lua_State *L, int idx) {
size_t len = 0;
const char *str = lua_tolstring(L, idx, &len);
if (!str) typerror(L, idx, "string");
return std::string(str, len);
}
int check_int(lua_State *L, int idx) {
auto v = lua_tointeger(L, idx);
if (v == 0 && !lua_isnumber(L, idx))
typerror(L, idx, "number");
return v;
}
size_t check_uint(lua_State *L, int idx) {
auto v = lua_tointeger(L, idx);
if (v == 0 && !lua_isnumber(L, idx))
typerror(L, idx, "number");
if (v < 0)
argerror(L, idx, "must be >= 0");
return static_cast<size_t>(v);
}
void *check_udata(lua_State *L, int idx, const char *mt) {
void *p = lua_touserdata(L, idx);
if (!p) typerror(L, idx, mt);
if (!lua_getmetatable(L, idx)) typerror(L, idx, mt);
lua_getfield(L, LUA_REGISTRYINDEX, mt);
if (!lua_rawequal(L, -1, -2)) typerror(L, idx, mt);
lua_pop(L, 2);
return p;
}
static int moon_line(lua_State *L, int lua_line, std::string const& file) {
if (luaL_dostring(L, "return require 'moonscript.line_tables'")) {
lua_pop(L, 1); // pop error message
return lua_line;
}
push_value(L, file);
lua_rawget(L, -2);
if (!lua_istable(L, -1)) {
lua_pop(L, 2);
return lua_line;
}
lua_rawgeti(L, -1, lua_line);
if (!lua_isnumber(L, -1)) {
lua_pop(L, 3);
return lua_line;
}
auto char_pos = static_cast<size_t>(lua_tonumber(L, -1));
lua_pop(L, 3);
// The moonscript line tables give us a character offset into the file,
// so now we need to map that to a line number
lua_getfield(L, LUA_REGISTRYINDEX, ("raw moonscript: " + file).c_str());
if (!lua_isstring(L, -1)) {
lua_pop(L, 1);
return lua_line;
}
size_t moon_len;
auto moon = lua_tolstring(L, -1, &moon_len);
return std::count(moon, moon + std::min(moon_len, char_pos), '\n') + 1;
}
int add_stack_trace(lua_State *L) {
int level = 1;
if (lua_isnumber(L, 2)) {
level = (int)lua_tointeger(L, 2);
lua_pop(L, 1);
}
const char *err = lua_tostring(L, 1);
if (!err) return 1;
std::string message = err;
if (lua_gettop(L))
lua_pop(L, 1);
// Strip the location from the error message since it's redundant with
// the stack trace
boost::regex location(R"(^\[string ".*"\]:[0-9]+: )");
message = regex_replace(message, location, "", boost::format_first_only);
std::vector<std::string> frames;
frames.emplace_back(std::move(message));
lua_Debug ar;
while (lua_getstack(L, level++, &ar)) {
lua_getinfo(L, "Snl", &ar);
if (ar.what[0] == 't')
frames.emplace_back("(tail call)");
else {
bool is_moon = false;
std::string file = ar.source;
if (file == "=[C]")
file = "<C function>";
else if (boost::ends_with(file, ".moon"))
is_moon = true;
auto real_line = [&](int line) {
return is_moon ? moon_line(L, line, file) : line;
};
std::string function = ar.name ? ar.name : "";
if (*ar.what == 'm')
function = "<main>";
else if (*ar.what == 'C')
function = '?';
else if (!*ar.namewhat)
function = str(boost::format("<anonymous function at lines %d-%d>") % real_line(ar.linedefined) % real_line(ar.lastlinedefined - 1));
frames.emplace_back(str(boost::format(" File \"%s\", line %d\n%s") % file % real_line(ar.currentline) % function));
}
}
push_value(L, join(frames | boost::adaptors::reversed, "\n"));
return 1;
}
int BOOST_ATTRIBUTE_NORETURN error(lua_State *L, const char *fmt, ...) {
va_list argp;
va_start(argp, fmt);
luaL_where(L, 1);
lua_pushvfstring(L, fmt, argp);
va_end(argp);
lua_concat(L, 2);
throw error_tag();
}
int BOOST_ATTRIBUTE_NORETURN argerror(lua_State *L, int narg, const char *extramsg) {
lua_Debug ar;
if (!lua_getstack(L, 0, &ar))
error(L, "bad argument #%d (%s)", narg, extramsg);
lua_getinfo(L, "n", &ar);
if (strcmp(ar.namewhat, "method") == 0 && --narg == 0)
error(L, "calling '%s' on bad self (%s)", ar.name, extramsg);
if (!ar.name) ar.name = "?";
error(L, "bad argument #%d to '%s' (%s)",
narg, ar.name, extramsg);
}
int BOOST_ATTRIBUTE_NORETURN typerror(lua_State *L, int narg, const char *tname) {
const char *msg = lua_pushfstring(L, "%s expected, got %s",
tname, luaL_typename(L, narg));
argerror(L, narg, msg);
}
void argcheck(lua_State *L, bool cond, int narg, const char *msg) {
if (!cond) argerror(L, narg, msg);
}
#ifdef _DEBUG
void LuaStackcheck::check_stack(int additional) {
int top = lua_gettop(L);
if (top - additional != startstack) {
LOG_D("automation/lua") << "lua stack size mismatch.";
dump();
assert(top - additional == startstack);
}
}
void LuaStackcheck::dump() {
int top = lua_gettop(L);
LOG_D("automation/lua/stackdump") << "--- dumping lua stack...";
for (int i = top; i > 0; i--) {
lua_pushvalue(L, i);
std::string type(lua_typename(L, lua_type(L, -1)));
if (lua_isstring(L, i))
LOG_D("automation/lua/stackdump") << type << ": " << lua_tostring(L, -1);
else
LOG_D("automation/lua/stackdump") << type;
lua_pop(L, 1);
}
LOG_D("automation/lua") << "--- end dump";
}
#endif
}
}