akkartik
/
teliva
1
1
Fork 0
Code Issues Pull Requests Releases Activity
teliva/src/lua.c

735 lines
19 KiB
C
Raw Blame History

/*
** $Id: lua.c,v 1.160.1.2 2007/12/28 15:32:23 roberto Exp $
** Lua stand-alone interpreter
** See Copyright Notice in lua.h
*/
#include <assert.h>
#include <ctype.h>
#include <fcntl.h>
#include <locale.h>
#include <ncurses.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define lua_c
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
static lua_State *globalL = NULL;
static const char *progname = LUA_PROGNAME;
static void lstop (lua_State *L, lua_Debug *ar) {
(void)ar; /* unused arg. */
lua_sethook(L, NULL, 0, 0);
luaL_error(L, "interrupted!");
}
static void laction (int i) {
signal(i, SIG_DFL); /* if another SIGINT happens before lstop,
terminate process (default action) */
lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
}
static void print_usage (void) {
printw(
"usage: %s [options] [script [args]].\n"
"Available options are:\n"
" -e stat execute string " LUA_QL("stat") "\n"
" -l name require library " LUA_QL("name") "\n"
" -i enter interactive mode after executing " LUA_QL("script") "\n"
" -v show version information\n"
" -- stop handling options\n"
,
progname);
refresh();
}
static void l_message (const char *pname, const char *msg) {
if (!stdscr || isendwin()) {
printf("%s: %s\n", pname, msg);
exit(1);
}
if (pname) mvprintw(LINES-2, 0, "%s: ", pname);
printw(msg);
mvprintw(LINES-1, 0, "sorry, you'll need to edit the image directly. press any key to exit.");
refresh();
getch();
}
static int report (lua_State *L, int status) {
if (status && !lua_isnil(L, -1)) {
const char *msg = lua_tostring(L, -1);
if (msg == NULL) msg = "(error object is not a string)";
l_message(progname, msg);
lua_pop(L, 1);
}
return status;
}
static int traceback (lua_State *L) {
if (!lua_isstring(L, 1)) /* 'message' not a string? */
return 1; /* keep it intact */
lua_getfield(L, LUA_GLOBALSINDEX, "debug");
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
return 1;
}
lua_getfield(L, -1, "traceback");
if (!lua_isfunction(L, -1)) {
lua_pop(L, 2);
return 1;
}
lua_pushvalue(L, 1); /* pass error message */
lua_pushinteger(L, 2); /* skip this function and traceback */
lua_call(L, 2, 1); /* call debug.traceback */
return 1;
}
static int docall (lua_State *L, int narg, int clear) {
int status;
int base = lua_gettop(L) - narg; /* function index */
lua_pushcfunction(L, traceback); /* push traceback function */
lua_insert(L, base); /* put it under chunk and args */
signal(SIGINT, laction);
status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
signal(SIGINT, SIG_DFL);
lua_remove(L, base); /* remove traceback function */
/* force a complete garbage collection in case of errors */
if (status != 0) lua_gc(L, LUA_GCCOLLECT, 0);
return status;
}
static void print_version (void) {
l_message(NULL, LUA_RELEASE " " LUA_COPYRIGHT);
}
/* pushes commandline args to the stack, then an array of all commandline args */
static int getargs (lua_State *L, char **argv, int n) {
int narg;
int i;
int argc = 0;
while (argv[argc]) argc++; /* count total number of arguments */
narg = argc - (n + 1); /* number of arguments to the script */
luaL_checkstack(L, narg + 3, "too many arguments to script");
for (i=n+1; i < argc; i++)
lua_pushstring(L, argv[i]);
lua_createtable(L, narg, n + 1);
for (i=0; i < argc; i++) {
lua_pushstring(L, argv[i]);
lua_rawseti(L, -2, i - n);
}
return narg;
}
static int dofile (lua_State *L, const char *name) {
int status = luaL_loadfile(L, name) || docall(L, 0, 1);
return report(L, status);
}
static int dostring (lua_State *L, const char *s, const char *name) {
int status = luaL_loadbuffer(L, s, strlen(s), name) || docall(L, 0, 1);
return report(L, status);
}
static int dolibrary (lua_State *L, const char *name) {
lua_getglobal(L, "require");
lua_pushstring(L, name);
return report(L, docall(L, 1, 1));
}
static const char *get_prompt (lua_State *L, int firstline) {
const char *p;
lua_getfield(L, LUA_GLOBALSINDEX, firstline ? "_PROMPT" : "_PROMPT2");
p = lua_tostring(L, -1);
if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2);
lua_pop(L, 1); /* remove global */
return p;
}
static int incomplete (lua_State *L, int status) {
if (status == LUA_ERRSYNTAX) {
size_t lmsg;
const char *msg = lua_tolstring(L, -1, &lmsg);
const char *tp = msg + lmsg - (sizeof(LUA_QL("<eof>")) - 1);
if (strstr(msg, LUA_QL("<eof>")) == tp) {
lua_pop(L, 1);
return 1;
}
}
return 0; /* else... */
}
static int pushline (lua_State *L, int firstline) {
char buffer[LUA_MAXINPUT];
char *b = buffer;
size_t l;
const char *prmt = get_prompt(L, firstline);
addstr(prmt);
refresh();
getnstr(b, LUA_MAXINPUT);
l = strlen(b);
if (l > 0 && b[l-1] == '\n') /* line ends with newline? */
b[l-1] = '\0'; /* remove it */
if (firstline && b[0] == '=') /* first line starts with `=' ? */
lua_pushfstring(L, "return %s", b+1); /* change it to `return' */
else
lua_pushstring(L, b);
return 1;
}
static int loadline (lua_State *L) {
int status;
lua_settop(L, 0);
if (!pushline(L, 1))
return -1; /* no input */
for (;;) { /* repeat until gets a complete line */
status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=keyboard");
if (!incomplete(L, status)) break; /* cannot try to add lines? */
if (!pushline(L, 0)) /* no more input? */
return -1;
lua_pushliteral(L, "\n"); /* add a new line... */
lua_insert(L, -2); /* ...between the two lines */
lua_concat(L, 3); /* join them */
}
lua_remove(L, 1); /* remove line */
return status;
}
static void dotty (lua_State *L) {
int status;
const char *oldprogname = progname;
progname = NULL;
while ((status = loadline(L)) != -1) {
if (status == 0) status = docall(L, 0, 0);
report(L, status);
if (status == 0 && lua_gettop(L) > 0) { /* any result to print? */
lua_getglobal(L, "print");
lua_insert(L, 1);
if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != 0)
l_message(progname, lua_pushfstring(L,
"error calling " LUA_QL("print") " (%s)",
lua_tostring(L, -1)));
}
}
lua_settop(L, 0); /* clear stack */
refresh();
progname = oldprogname;
}
void stack_dump (lua_State *L) {
int i;
int top = lua_gettop(L);
int y = 1;
for (i = 1; i <= top; i++) { /* repeat for each level */
int t = lua_type(L, i);
switch (t) {
case LUA_TSTRING: /* strings */
mvprintw(y, 30, "`%s'", lua_tostring(L, i));
break;
case LUA_TBOOLEAN: /* booleans */
mvprintw(y, 30, lua_toboolean(L, i) ? "true" : "false");
break;
case LUA_TNUMBER: /* numbers */
mvprintw(y, 30, "%g", lua_tonumber(L, i));
break;
default: /* other values */
mvprintw(y, 30, "%s", lua_typename(L, t));
break;
}
y++;
mvprintw(y, 30, " "); /* put a separator */
y++;
}
mvprintw(y, 30, "\n"); /* end the listing */
y++;
}
char *Image_name = NULL;
static int handle_image (lua_State *L, char **argv, int n) {
int status;
int narg = getargs(L, argv, n); /* collect arguments */
lua_setglobal(L, "arg");
/* parse and load file contents (teliva_program table) */
Image_name = argv[n];
status = luaL_loadfile(L, Image_name);
lua_insert(L, -(narg+1));
if (status != 0) {
return status;
}
status = docall(L, narg, 0);
lua_getglobal(L, "teliva_program");
int table = lua_gettop(L);
/* parse and load each binding in teliva_program */
for (lua_pushnil(L); lua_next(L, table) != 0; lua_pop(L, 1)) {
const char* key = lua_tostring(L, -2);
const char* value = lua_tostring(L, -1);
status = dostring(L, value, key);
if (status != 0) return report(L, status);
}
/* call main() */
lua_getglobal(L, "main");
status = docall(L, 0, 1);
if (status != 0) return report(L, status);
return 0;
}
#define CURRENT_DEFINITION_LEN 256
char Current_definition[CURRENT_DEFINITION_LEN+1] = {0};
void save_to_current_definition_and_editor_buffer (lua_State *L, const char *definition) {
strncpy(Current_definition, definition, CURRENT_DEFINITION_LEN);
lua_getglobal(L, "teliva_program");
lua_getfield(L, -1, Current_definition);
const char *contents = lua_tostring(L, -1);
lua_pop(L, 1);
int outfd = open("teliva_editbuffer", O_WRONLY|O_CREAT|O_TRUNC, 0644);
if (contents != NULL)
write(outfd, contents, strlen(contents));
close(outfd);
lua_settop(L, 0);
}
static void read_contents (lua_State *L, char *filename, char *out) {
int infd = open(filename, O_RDONLY);
read(infd, out, 8190); /* TODO: handle overly large file */
close(infd);
}
/* table to update is at top of stack */
static void update_definition (lua_State *L, const char *name, char *out) {
lua_getglobal(L, "teliva_program");
lua_pushstring(L, out);
assert(strlen(name) > 0);
lua_setfield(L, -2, name);
lua_settop(L, 0);
}
static void save_image (lua_State *L) {
lua_getglobal(L, "teliva_program");
int table = lua_gettop(L);
FILE* fp = fopen(Image_name, "w");
fprintf(fp, "teliva_program = {\n");
for (lua_pushnil(L); lua_next(L, table) != 0; lua_pop(L, 1)) {
const char* key = lua_tostring(L, -2);
const char* value = lua_tostring(L, -1);
fprintf(fp, " %s = [==[", key);
fprintf(fp, "%s", value);
fprintf(fp, "]==],\n");
}
fprintf(fp, "}\n");
fclose(fp);
lua_settop(L, 0);
}
/* death and rebirth */
char **Argv = NULL;
extern void edit (lua_State *L, char *filename, const char *message);
extern void clearEditor (void);
extern int editorOpen (char *filename);
void edit_buffer (lua_State *L, const char *message) {
edit(L, "teliva_editbuffer", message);
}
void editor_refresh_buffer (void) {
clearEditor();
editorOpen("teliva_editbuffer");
}
extern void resumeEdit (lua_State *L, char *filename);
void editor_resume (lua_State *L) {
resumeEdit(L, "teliva_editbuffer");
}
int load_editor_buffer_to_current_definition_in_image(lua_State *L) {
char new_contents[8192] = {0};
read_contents(L, "teliva_editbuffer", new_contents);
update_definition(L, Current_definition, new_contents);
save_image(L);
/* reload binding */
return luaL_loadbuffer(L, new_contents, strlen(new_contents), Current_definition)
|| docall(L, 0, 1);
}
const char *Previous_error = NULL;
void edit_image (lua_State *L, const char *definition) {
save_to_current_definition_and_editor_buffer(L, definition);
edit_buffer(L, /*status message*/ "");
// error handling
while (1) {
int status;
status = load_editor_buffer_to_current_definition_in_image(L);
if (status == 0 || lua_isnil(L, -1))
break;
Previous_error = lua_tostring(L, -1);
if (Previous_error == NULL) Previous_error = "(error object is not a string)";
editor_resume(L);
lua_pop(L, 1);
}
}
extern void draw_menu_item (const char* key, const char* name);
static void browser_menu (void) {
attrset(A_REVERSE);
for (int x = 0; x < COLS; ++x)
mvaddch(LINES-1, x, ' ');
attrset(A_NORMAL);
extern int menu_column;
menu_column = 2;
draw_menu_item("Esc", "go back");
draw_menu_item("Enter", "submit");
draw_menu_item("^u", "clear");
attrset(A_NORMAL);
}
#define BG(i) (COLOR_PAIR((i)+8))
#define FG(i) (COLOR_PAIR(i))
void browse_definition (const char *definition_name) {
attron(BG(7));
addstr(definition_name);
attrset(A_NORMAL);
addstr(" ");
}
/* return true if submitted */
int browse_image (lua_State *L) {
clear();
luaL_newmetatable(L, "__teliva_call_graph_depth");
int cgt = lua_gettop(L);
// special-case: we don't instrument the call to main, but it's always 1
lua_pushinteger(L, 1);
lua_setfield(L, cgt, "main");
// segment definitions by depth
lua_getglobal(L, "teliva_program");
int t = lua_gettop(L);
int y = 2;
mvaddstr(y, 0, "data: ");
// first: data (non-functions) that's not the Teliva menu or curses variables
for (lua_pushnil(L); lua_next(L, t) != 0;) {
const char *definition_name = lua_tostring(L, -2);
lua_getglobal(L, definition_name);
int is_userdata = lua_isuserdata(L, -1);
int is_function = lua_isfunction(L, -1);
lua_pop(L, 1);
if (strcmp(definition_name, "menu") != 0 // required by all Teliva programs
&& !is_function // functions are not data
&& !is_userdata // including curses window objects
// (unlikely to have an interesting definition)
) {
browse_definition(definition_name);
}
lua_pop(L, 1); // value
// leave key on stack for next iteration
}
// second: menu and other userdata
for (lua_pushnil(L); lua_next(L, t) != 0;) {
const char* definition_name = lua_tostring(L, -2);
lua_getglobal(L, definition_name);
int is_userdata = lua_isuserdata(L, -1);
lua_pop(L, 1);
if (strcmp(definition_name, "menu") == 0
|| is_userdata // including curses window objects
) {
browse_definition(definition_name);
}
lua_pop(L, 1); // value
// leave key on stack for next iteration
}
// functions by level
y += 2;
mvprintw(y, 0, "functions: ");
y++;
for (int level = 1; level < 5; ++level) {
mvaddstr(y, 0, " ");
for (lua_pushnil(L); lua_next(L, t) != 0;) {
const char* definition_name = lua_tostring(L, -2);
lua_getfield(L, cgt, definition_name);
int depth = lua_tointeger(L, -1);
if (depth == level)
browse_definition(definition_name);
lua_pop(L, 1); // depth of value
lua_pop(L, 1); // value
// leave key on stack for next iteration
}
y += 2;
}
// unused functions
mvaddstr(y, 0, " ");
for (lua_pushnil(L); lua_next(L, t) != 0;) {
const char* definition_name = lua_tostring(L, -2);
lua_getglobal(L, definition_name);
int is_function = lua_isfunction(L, -1);
lua_pop(L, 1);
lua_getfield(L, cgt, definition_name);
if (is_function && lua_isnoneornil(L, -1))
browse_definition(definition_name);
lua_pop(L, 1); // depth of value
lua_pop(L, 1); // value
// leave key on stack for next iteration
}
lua_settop(L, 0);
enum {
ENTER = 10,
CTRL_U = 21,
ESC = 27,
};
char query[CURRENT_DEFINITION_LEN+1] = {0};
int qlen = 0;
while (1) {
browser_menu();
for (int x = 0; x < COLS; ++x)
mvaddch(LINES-2, x, ' ');
mvprintw(LINES-2, 0, "Edit: %s", query);
int c = getch();
if (c == KEY_BACKSPACE) {
if (qlen != 0) query[--qlen] = '\0';
} else if (c == ESC) {
return 0;
} else if (c == ENTER) {
edit_image(L, query);
return 1;
} else if (c == CTRL_U) {
qlen = 0;
query[qlen] = '\0';
} else if (isprint(c)) {
if (qlen < CURRENT_DEFINITION_LEN) {
query[qlen++] = c;
query[qlen] = '\0';
}
}
}
/* never gets here */
}
extern void cleanup_curses (void);
void switch_to_editor (lua_State *L, const char *message) {
/* clobber the app's ncurses colors; we'll restart the app when we rerun it. */
for (int i = 0; i < 8; ++i)
init_pair(i, i, -1);
for (int i = 0; i < 8; ++i)
init_pair(i+8, -1, i);
nodelay(stdscr, 0);
if (browse_image(L))
cleanup_curses();
execv(Argv[0], Argv);
/* never returns */
}
/* check that argument has no extra characters at the end */
#define notail(x) {if ((x)[2] != '\0') return -1;}
static int collectargs (char **argv, int *pi, int *pv, int *pe) {
int i;
for (i = 1; argv[i] != NULL; i++) {
if (argv[i][0] != '-') /* not an option? */
return i;
switch (argv[i][1]) { /* option */
case '-':
notail(argv[i]);
return (argv[i+1] != NULL ? i+1 : 0);
case '\0':
return i;
case 'i':
notail(argv[i]);
*pi = 1; /* go through */
case 'v':
notail(argv[i]);
*pv = 1;
break;
case 'e':
*pe = 1; /* go through */
case 'l':
if (argv[i][2] == '\0') {
i++;
if (argv[i] == NULL) return -1;
}
break;
default: return -1; /* invalid option */
}
}
return 0;
}
static int runargs (lua_State *L, char **argv, int n) {
int i;
for (i = 1; i < n; i++) {
if (argv[i] == NULL) continue;
lua_assert(argv[i][0] == '-');
switch (argv[i][1]) { /* option */
case 'e': {
const char *chunk = argv[i] + 2;
if (*chunk == '\0') chunk = argv[++i];
lua_assert(chunk != NULL);
if (dostring(L, chunk, "=(command line)") != 0)
return 1;
break;
}
case 'l': {
const char *filename = argv[i] + 2;
if (*filename == '\0') filename = argv[++i];
lua_assert(filename != NULL);
if (dolibrary(L, filename))
return 1; /* stop if file fails */
break;
}
default: break;
}
}
return 0;
}
static int handle_luainit (lua_State *L) {
const char *init = getenv(LUA_INIT);
if (init == NULL) return 0; /* status OK */
else if (init[0] == '@')
return dofile(L, init+1);
else
return dostring(L, init, "=" LUA_INIT);
}
/* roughly equivalent to:
* globalname = require(filename) */
static int dorequire (lua_State *L, const char *filename, const char *globalname) {
int status = luaL_loadfile(L, filename) || docall(L, /*nargs*/0, /*don't clean up stack*/0);
if (status != 0) return report(L, status);
if (lua_isnil(L, -1)) {
endwin();
printf("%s didn't return a module\n", filename);
exit(1);
}
lua_setglobal(L, globalname);
return 0;
}
struct Smain {
int argc;
char **argv;
int status;
};
static int pmain (lua_State *L) {
struct Smain *s = (struct Smain *)lua_touserdata(L, 1);
char **argv = s->argv;
int status;
int image;
int has_i = 0, has_v = 0, has_e = 0;
globalL = L;
if (argv[0] && argv[0][0]) progname = argv[0];
lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */
luaL_openlibs(L); /* open libraries */
status = dorequire(L, "src/lcurses/curses.lua", "curses");
if (status != 0) return 0;
status = dorequire(L, "src/luasocket/socket.lua", "socket");
if (status != 0) return 0;
status = dorequire(L, "src/json.lua", "json");
if (status != 0) return 0;
lua_gc(L, LUA_GCRESTART, 0);
s->status = handle_luainit(L);
if (s->status != 0) return 0;
image = collectargs(argv, &has_i, &has_v, &has_e);
if (image < 0) { /* invalid args? */
print_usage();
getch();
s->status = 1;
return 0;
}
if (has_v) print_version();
s->status = runargs(L, argv, (image > 0) ? image : s->argc);
if (s->status != 0) return 0;
if (image)
s->status = handle_image(L, argv, image);
if (s->status != 0) return 0;
if (has_i)
dotty(L);
else if (image == 0 && !has_e && !has_v) {
print_version();
dotty(L);
}
return 0;
}
extern void draw_menu (lua_State *);
int main (int argc, char **argv) {
int status;
struct Smain s;
lua_State *L = luaL_newstate();
if (L == NULL) {
l_message(argv[0], "cannot create state: not enough memory");
return EXIT_FAILURE;
}
setlocale(LC_ALL, "");
initscr();
keypad(stdscr, 1);
start_color();
use_default_colors();
draw_menu(L);
echo();
s.argc = argc;
s.argv = argv;
Argv = argv;
status = lua_cpcall(L, &pmain, &s);
report(L, status);
lua_close(L);
cleanup_curses();
return (status || s.status) ? EXIT_FAILURE : EXIT_SUCCESS;
}
Reference in New Issue View Git Blame Copy Permalink