luau/CLI/Repl.cpp

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// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
#include "lua.h"
#include "lualib.h"
#include "Luau/Compiler.h"
#include "Luau/BytecodeBuilder.h"
#include "Luau/Parser.h"
#include "FileUtils.h"
#include "Profiler.h"
#include "linenoise.hpp"
#include <memory>
#ifdef _WIN32
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#include <io.h>
#include <fcntl.h>
#endif
enum class CompileFormat
{
Text,
Binary
};
static int lua_loadstring(lua_State* L)
{
size_t l = 0;
const char* s = luaL_checklstring(L, 1, &l);
const char* chunkname = luaL_optstring(L, 2, s);
lua_setsafeenv(L, LUA_ENVIRONINDEX, false);
std::string bytecode = Luau::compile(std::string(s, l));
if (luau_load(L, chunkname, bytecode.data(), bytecode.size(), 0) == 0)
return 1;
lua_pushnil(L);
lua_insert(L, -2); /* put before error message */
return 2; /* return nil plus error message */
}
static int finishrequire(lua_State* L)
{
if (lua_isstring(L, -1))
lua_error(L);
return 1;
}
static int lua_require(lua_State* L)
{
std::string name = luaL_checkstring(L, 1);
std::string chunkname = "=" + name;
luaL_findtable(L, LUA_REGISTRYINDEX, "_MODULES", 1);
// return the module from the cache
lua_getfield(L, -1, name.c_str());
if (!lua_isnil(L, -1))
return finishrequire(L);
lua_pop(L, 1);
std::optional<std::string> source = readFile(name + ".luau");
if (!source)
{
source = readFile(name + ".lua"); // try .lua if .luau doesn't exist
if (!source)
luaL_argerrorL(L, 1, ("error loading " + name).c_str()); // if neither .luau nor .lua exist, we have an error
}
// module needs to run in a new thread, isolated from the rest
lua_State* GL = lua_mainthread(L);
lua_State* ML = lua_newthread(GL);
lua_xmove(GL, L, 1);
// new thread needs to have the globals sandboxed
luaL_sandboxthread(ML);
// now we can compile & run module on the new thread
std::string bytecode = Luau::compile(*source);
if (luau_load(ML, chunkname.c_str(), bytecode.data(), bytecode.size(), 0) == 0)
{
int status = lua_resume(ML, L, 0);
if (status == 0)
{
if (lua_gettop(ML) == 0)
lua_pushstring(ML, "module must return a value");
else if (!lua_istable(ML, -1) && !lua_isfunction(ML, -1))
lua_pushstring(ML, "module must return a table or function");
}
else if (status == LUA_YIELD)
{
lua_pushstring(ML, "module can not yield");
}
else if (!lua_isstring(ML, -1))
{
lua_pushstring(ML, "unknown error while running module");
}
}
// there's now a return value on top of ML; stack of L is MODULES thread
lua_xmove(ML, L, 1);
lua_pushvalue(L, -1);
lua_setfield(L, -4, name.c_str());
return finishrequire(L);
}
static int lua_collectgarbage(lua_State* L)
{
const char* option = luaL_optstring(L, 1, "collect");
if (strcmp(option, "collect") == 0)
{
lua_gc(L, LUA_GCCOLLECT, 0);
return 0;
}
if (strcmp(option, "count") == 0)
{
int c = lua_gc(L, LUA_GCCOUNT, 0);
lua_pushnumber(L, c);
return 1;
}
luaL_error(L, "collectgarbage must be called with 'count' or 'collect'");
}
static void setupState(lua_State* L)
{
luaL_openlibs(L);
static const luaL_Reg funcs[] = {
{"loadstring", lua_loadstring},
{"require", lua_require},
{"collectgarbage", lua_collectgarbage},
{NULL, NULL},
};
lua_pushvalue(L, LUA_GLOBALSINDEX);
luaL_register(L, NULL, funcs);
lua_pop(L, 1);
luaL_sandbox(L);
}
static std::string runCode(lua_State* L, const std::string& source)
{
std::string bytecode = Luau::compile(source);
if (luau_load(L, "=stdin", bytecode.data(), bytecode.size(), 0) != 0)
{
size_t len;
const char* msg = lua_tolstring(L, -1, &len);
std::string error(msg, len);
lua_pop(L, 1);
return error;
}
lua_State* T = lua_newthread(L);
lua_pushvalue(L, -2);
lua_remove(L, -3);
lua_xmove(L, T, 1);
int status = lua_resume(T, NULL, 0);
if (status == 0)
{
int n = lua_gettop(T);
if (n)
{
luaL_checkstack(T, LUA_MINSTACK, "too many results to print");
lua_getglobal(T, "print");
lua_insert(T, 1);
lua_pcall(T, n, 0, 0);
}
}
else
{
std::string error;
if (status == LUA_YIELD)
{
error = "thread yielded unexpectedly";
}
else if (const char* str = lua_tostring(T, -1))
{
error = str;
}
error += "\nstack backtrace:\n";
error += lua_debugtrace(T);
#ifdef __EMSCRIPTEN__
// nicer formatting for errors in web repl
error = "Error:" + error;
#endif
fprintf(stdout, "%s", error.c_str());
}
lua_pop(L, 1);
return std::string();
}
#ifdef __EMSCRIPTEN__
extern "C"
{
const char* executeScript(const char* source)
{
// setup flags
for (Luau::FValue<bool>* flag = Luau::FValue<bool>::list; flag; flag = flag->next)
if (strncmp(flag->name, "Luau", 4) == 0)
flag->value = true;
// create new state
std::unique_ptr<lua_State, void (*)(lua_State*)> globalState(luaL_newstate(), lua_close);
lua_State* L = globalState.get();
// setup state
setupState(L);
// sandbox thread
luaL_sandboxthread(L);
// static string for caching result (prevents dangling ptr on function exit)
static std::string result;
// run code + collect error
result = runCode(L, source);
return result.empty() ? NULL : result.c_str();
}
}
#endif
// Excluded from emscripten compilation to avoid -Wunused-function errors.
#ifndef __EMSCRIPTEN__
static void completeIndexer(lua_State* L, const char* editBuffer, size_t start, std::vector<std::string>& completions)
{
std::string_view lookup = editBuffer + start;
for (;;)
{
size_t dot = lookup.find('.');
std::string_view prefix = lookup.substr(0, dot);
if (dot == std::string_view::npos)
{
// table, key
lua_pushnil(L);
while (lua_next(L, -2) != 0)
{
// table, key, value
std::string_view key = lua_tostring(L, -2);
if (!key.empty() && Luau::startsWith(key, prefix))
completions.push_back(editBuffer + std::string(key.substr(prefix.size())));
lua_pop(L, 1);
}
break;
}
else
{
// find the key in the table
lua_pushlstring(L, prefix.data(), prefix.size());
lua_rawget(L, -2);
lua_remove(L, -2);
if (lua_isnil(L, -1))
break;
lookup.remove_prefix(dot + 1);
}
}
lua_pop(L, 1);
}
static void completeRepl(lua_State* L, const char* editBuffer, std::vector<std::string>& completions)
{
size_t start = strlen(editBuffer);
while (start > 0 && (isalnum(editBuffer[start - 1]) || editBuffer[start - 1] == '.'))
start--;
// look the value up in current global table first
lua_pushvalue(L, LUA_GLOBALSINDEX);
completeIndexer(L, editBuffer, start, completions);
// and in actual global table after that
lua_getglobal(L, "_G");
completeIndexer(L, editBuffer, start, completions);
}
static void runRepl()
{
std::unique_ptr<lua_State, void (*)(lua_State*)> globalState(luaL_newstate(), lua_close);
lua_State* L = globalState.get();
setupState(L);
luaL_sandboxthread(L);
linenoise::SetCompletionCallback([L](const char* editBuffer, std::vector<std::string>& completions) {
completeRepl(L, editBuffer, completions);
});
std::string buffer;
for (;;)
{
bool quit = false;
std::string line = linenoise::Readline(buffer.empty() ? "> " : ">> ", quit);
if (quit)
break;
if (buffer.empty() && runCode(L, std::string("return ") + line) == std::string())
{
linenoise::AddHistory(line.c_str());
continue;
}
buffer += line;
buffer += " "; // linenoise doesn't work very well with multiline history entries
std::string error = runCode(L, buffer);
if (error.length() >= 5 && error.compare(error.length() - 5, 5, "<eof>") == 0)
{
continue;
}
if (error.length())
{
fprintf(stdout, "%s\n", error.c_str());
}
linenoise::AddHistory(buffer.c_str());
buffer.clear();
}
}
static bool runFile(const char* name, lua_State* GL)
{
std::optional<std::string> source = readFile(name);
if (!source)
{
fprintf(stderr, "Error opening %s\n", name);
return false;
}
// module needs to run in a new thread, isolated from the rest
lua_State* L = lua_newthread(GL);
// new thread needs to have the globals sandboxed
luaL_sandboxthread(L);
std::string chunkname = "=" + std::string(name);
std::string bytecode = Luau::compile(*source);
int status = 0;
if (luau_load(L, chunkname.c_str(), bytecode.data(), bytecode.size(), 0) == 0)
{
status = lua_resume(L, NULL, 0);
}
else
{
status = LUA_ERRSYNTAX;
}
if (status != 0)
{
std::string error;
if (status == LUA_YIELD)
{
error = "thread yielded unexpectedly";
}
else if (const char* str = lua_tostring(L, -1))
{
error = str;
}
error += "\nstacktrace:\n";
error += lua_debugtrace(L);
fprintf(stderr, "%s", error.c_str());
}
lua_pop(GL, 1);
return status == 0;
}
static void report(const char* name, const Luau::Location& location, const char* type, const char* message)
{
fprintf(stderr, "%s(%d,%d): %s: %s\n", name, location.begin.line + 1, location.begin.column + 1, type, message);
}
static void reportError(const char* name, const Luau::ParseError& error)
{
report(name, error.getLocation(), "SyntaxError", error.what());
}
static void reportError(const char* name, const Luau::CompileError& error)
{
report(name, error.getLocation(), "CompileError", error.what());
}
static bool compileFile(const char* name, CompileFormat format)
{
std::optional<std::string> source = readFile(name);
if (!source)
{
fprintf(stderr, "Error opening %s\n", name);
return false;
}
try
{
Luau::BytecodeBuilder bcb;
if (format == CompileFormat::Text)
{
bcb.setDumpFlags(Luau::BytecodeBuilder::Dump_Code | Luau::BytecodeBuilder::Dump_Source);
bcb.setDumpSource(*source);
}
Luau::compileOrThrow(bcb, *source);
switch (format)
{
case CompileFormat::Text:
printf("%s", bcb.dumpEverything().c_str());
break;
case CompileFormat::Binary:
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fwrite(bcb.getBytecode().data(), 1, bcb.getBytecode().size(), stdout);
break;
}
return true;
}
catch (Luau::ParseErrors& e)
{
for (auto& error : e.getErrors())
reportError(name, error);
return false;
}
catch (Luau::CompileError& e)
{
reportError(name, e);
return false;
}
}
static void displayHelp(const char* argv0)
{
printf("Usage: %s [--mode] [options] [file list]\n", argv0);
printf("\n");
printf("When mode and file list are omitted, an interactive REPL is started instead.\n");
printf("\n");
printf("Available modes:\n");
printf(" omitted: compile and run input files one by one\n");
printf(" --compile[=format]: compile input files and output resulting formatted bytecode (binary or text)\n");
printf("\n");
printf("Available options:\n");
printf(" --profile[=N]: profile the code using N Hz sampling (default 10000) and output results to profile.out\n");
}
static int assertionHandler(const char* expr, const char* file, int line)
{
printf("%s(%d): ASSERTION FAILED: %s\n", file, line, expr);
return 1;
}
int main(int argc, char** argv)
{
Luau::assertHandler() = assertionHandler;
for (Luau::FValue<bool>* flag = Luau::FValue<bool>::list; flag; flag = flag->next)
if (strncmp(flag->name, "Luau", 4) == 0)
flag->value = true;
if (argc == 1)
{
runRepl();
return 0;
}
if (argc >= 2 && strcmp(argv[1], "--help") == 0)
{
displayHelp(argv[0]);
return 0;
}
if (argc >= 2 && strncmp(argv[1], "--compile", strlen("--compile")) == 0)
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{
CompileFormat format = CompileFormat::Text;
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if (strcmp(argv[1], "--compile=binary") == 0)
format = CompileFormat::Binary;
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#ifdef _WIN32
if (format == CompileFormat::Binary)
_setmode(_fileno(stdout), _O_BINARY);
#endif
std::vector<std::string> files = getSourceFiles(argc, argv);
int failed = 0;
for (const std::string& path : files)
failed += !compileFile(path.c_str(), format);
return failed;
}
{
std::unique_ptr<lua_State, void (*)(lua_State*)> globalState(luaL_newstate(), lua_close);
lua_State* L = globalState.get();
setupState(L);
int profile = 0;
for (int i = 1; i < argc; ++i)
{
if (argv[i][0] != '-')
continue;
if (strcmp(argv[i], "--profile") == 0)
profile = 10000; // default to 10 KHz
else if (strncmp(argv[i], "--profile=", 10) == 0)
profile = atoi(argv[i] + 10);
}
if (profile)
profilerStart(L, profile);
std::vector<std::string> files = getSourceFiles(argc, argv);
int failed = 0;
for (const std::string& path : files)
failed += !runFile(path.c_str(), L);
if (profile)
{
profilerStop();
profilerDump("profile.out");
}
return failed;
}
}
#endif