@@ -1,497 +1,245 @@
1+// Copied straight from https://www.lua.org/source/5.1/lua.c.html
2+// with some of the cli stuff stripped out.
3+
14/*
2−** $Id: lua.c,v 1.206.1.1 2013/04/12 18:48:47 roberto Exp $
5+** $Id: lua.c,v 1.160.1.2 2007/12/28 15:32:23 roberto Exp $
36** Lua stand-alone interpreter
47** See Copyright Notice in lua.h
58*/
69
7−#include "pry.h"
810#include <signal.h>
911#include <stdio.h>
1012#include <stdlib.h>
1113#include <string.h>
1214
1315#define lua_c
16+#define LUA_USE_LINUX
1417
15−#include "lua.h"
16−
17−#include "lauxlib.h"
18−#include "lualib.h"
19−
20−
21−#if !defined(LUA_PROMPT)
22−#define LUA_PROMPT "> "
23−#define LUA_PROMPT2 ">> "
24−#endif
25−
26−#if !defined(LUA_PROGNAME)
27−#define LUA_PROGNAME "lua"
28−#endif
29−
30−#if !defined(LUA_MAXINPUT)
31−#define LUA_MAXINPUT 512
32−#endif
33−
34−#if !defined(LUA_INIT)
35−#define LUA_INIT "LUA_INIT"
36−#endif
37−
38−#define LUA_INITVERSION \
39− LUA_INIT "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR
40−
41−
42−/*
43−** lua_stdin_is_tty detects whether the standard input is a 'tty' (that
44−** is, whether we're running lua interactively).
45−*/
46−#if defined(LUA_USE_ISATTY)
47−#include <unistd.h>
48−#define lua_stdin_is_tty() isatty(0)
49−#elif defined(LUA_WIN)
50−#include <io.h>
51−#include <stdio.h>
52−#define lua_stdin_is_tty() _isatty(_fileno(stdin))
53−#else
54−#define lua_stdin_is_tty() 1 /* assume stdin is a tty */
55−#endif
56−
18+#include <lua.h>
5719
58−/*
59−** lua_readline defines how to show a prompt and then read a line from
60−** the standard input.
61−** lua_saveline defines how to "save" a read line in a "history".
62−** lua_freeline defines how to free a line read by lua_readline.
63−*/
64−#if defined(LUA_USE_READLINE)
65−
66−#include <stdio.h>
67−#include <readline/readline.h>
68−#include <readline/history.h>
69−#define lua_readline(L,b,p) ((void)L, ((b)=readline(p)) != NULL)
70−#define lua_saveline(L,idx) \
71− if (lua_rawlen(L,idx) > 0) /* non-empty line? */ \
72− add_history(lua_tostring(L, idx)); /* add it to history */
73−#define lua_freeline(L,b) ((void)L, free(b))
74−
75−#elif !defined(lua_readline)
76−
77−#define lua_readline(L,b,p) \
78− ((void)L, fputs(p, stdout), fflush(stdout), /* show prompt */ \
79− fgets(b, LUA_MAXINPUT, stdin) != NULL) /* get line */
80−#define lua_saveline(L,idx) { (void)L; (void)idx; }
81−#define lua_freeline(L,b) { (void)L; (void)b; }
82−
83−#endif
20+#include <lauxlib.h>
21+#include <luaconf.h>
22+#include <lualib.h>
8423
85−
86−
87−
88−static lua_State *globalL = NULL;
24+extern lua_State *pry_L;
8925
9026static const char *progname = LUA_PROGNAME;
9127
92−
93−
94−static void lstop (lua_State *L, lua_Debug *ar) {
95− (void)ar; /* unused arg. */
28+static void lstop(lua_State *L, lua_Debug *ar) {
29+ (void)ar; /* unused arg. */
9630 lua_sethook(L, NULL, 0, 0);
9731 luaL_error(L, "interrupted!");
9832}
9933
100−
101−static void laction (int i) {
34+static void laction(int i) {
10235 signal(i, SIG_DFL); /* if another SIGINT happens before lstop,
10336 terminate process (default action) */
104− lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
37+ lua_sethook(pry_L, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
10538}
10639
107−
108−static void print_usage (const char *badoption) {
109− luai_writestringerror("%s: ", progname);
110− if (badoption[1] == 'e' || badoption[1] == 'l')
111− luai_writestringerror("'%s' needs argument\n", badoption);
112− else
113− luai_writestringerror("unrecognized option '%s'\n", badoption);
114− luai_writestringerror(
115− "usage: %s [options] [script [args]]\n"
116− "Available options are:\n"
117− " -e stat execute string " LUA_QL("stat") "\n"
118− " -i enter interactive mode after executing " LUA_QL("script") "\n"
119− " -l name require library " LUA_QL("name") "\n"
120− " -v show version information\n"
121− " -E ignore environment variables\n"
122− " -- stop handling options\n"
123− " - stop handling options and execute stdin\n"
124− ,
125− progname);
126−}
127−
128−
129−static void l_message (const char *pname, const char *msg) {
130− if (pname) luai_writestringerror("%s: ", pname);
131− luai_writestringerror("%s\n", msg);
40+static void l_message(const char *pname, const char *msg) {
41+ if (pname)
42+ fprintf(stderr, "%s: ", pname);
43+ fprintf(stderr, "%s\n", msg);
44+ fflush(stderr);
13245}
13346
134−
135−static int report (lua_State *L, int status) {
136− if (status != LUA_OK && !lua_isnil(L, -1)) {
47+static int report(lua_State *L, int status) {
48+ if (status && !lua_isnil(L, -1)) {
13749 const char *msg = lua_tostring(L, -1);
138− if (msg == NULL) msg = "(error object is not a string)";
50+ if (msg == NULL)
51+ msg = "(error object is not a string)";
13952 l_message(progname, msg);
14053 lua_pop(L, 1);
141− /* force a complete garbage collection in case of errors */
142− lua_gc(L, LUA_GCCOLLECT, 0);
14354 }
14455 return status;
14556}
14657
147−
148−/* the next function is called unprotected, so it must avoid errors */
149−void finalreport (lua_State *L, int status) {
150− if (status != LUA_OK) {
151− const char *msg = (lua_type(L, -1) == LUA_TSTRING) ? lua_tostring(L, -1)
152− : NULL;
153− if (msg == NULL) msg = "(error object is not a string)";
154− l_message(progname, msg);
58+static int traceback(lua_State *L) {
59+ if (!lua_isstring(L, 1)) /* 'message' not a string? */
60+ return 1; /* keep it intact */
61+ lua_getfield(L, LUA_GLOBALSINDEX, "debug");
62+ if (!lua_istable(L, -1)) {
15563 lua_pop(L, 1);
64+ return 1;
15665 }
157−}
158−
159−
160−static int traceback (lua_State *L) {
161− const char *msg = lua_tostring(L, 1);
162− if (msg)
163− luaL_traceback(L, L, msg, 1);
164− else if (!lua_isnoneornil(L, 1)) { /* is there an error object? */
165− if (!luaL_callmeta(L, 1, "__tostring")) /* try its 'tostring' metamethod */
166− lua_pushliteral(L, "(no error message)");
66+ lua_getfield(L, -1, "traceback");
67+ if (!lua_isfunction(L, -1)) {
68+ lua_pop(L, 2);
69+ return 1;
16770 }
71+ lua_pushvalue(L, 1); /* pass error message */
72+ lua_pushinteger(L, 2); /* skip this function and traceback */
73+ lua_call(L, 2, 1); /* call debug.traceback */
16874 return 1;
16975}
17076
171−
172−static int docall (lua_State *L, int narg, int nres) {
77+static int docall(lua_State *L, int narg, int clear) {
17378 int status;
174− int base = lua_gettop(L) - narg; /* function index */
175− lua_pushcfunction(L, traceback); /* push traceback function */
176− lua_insert(L, base); /* put it under chunk and args */
177− globalL = L; /* to be available to 'laction' */
79+ int base = lua_gettop(L) - narg; /* function index */
80+ lua_pushcfunction(L, traceback); /* push traceback function */
81+ lua_insert(L, base); /* put it under chunk and args */
17882 signal(SIGINT, laction);
179− status = lua_pcall(L, narg, nres, base);
83+ status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
18084 signal(SIGINT, SIG_DFL);
181− lua_remove(L, base); /* remove traceback function */
85+ lua_remove(L, base); /* remove traceback function */
86+ /* force a complete garbage collection in case of errors */
87+ if (status != 0)
88+ lua_gc(L, LUA_GCCOLLECT, 0);
18289 return status;
18390}
18491
185−
186−static void print_version (void) {
187− luai_writestring(LUA_COPYRIGHT, strlen(LUA_COPYRIGHT));
188− luai_writeline();
92+static void print_version(void) {
93+ l_message(NULL, LUA_RELEASE " " LUA_COPYRIGHT);
18994}
19095
191−
192−static int getargs (lua_State *L, char **argv, int n) {
96+static int getargs(lua_State *L, char **argv, int n) {
19397 int narg;
19498 int i;
19599 int argc = 0;
196− while (argv[argc]) argc++; /* count total number of arguments */
197− narg = argc - (n + 1); /* number of arguments to the script */
100+ while (argv[argc])
101+ argc++; /* count total number of arguments */
102+ narg = argc - (n + 1); /* number of arguments to the script */
198103 luaL_checkstack(L, narg + 3, "too many arguments to script");
199− for (i=n+1; i < argc; i++)
104+ for (i = n + 1; i < argc; i++)
200105 lua_pushstring(L, argv[i]);
201106 lua_createtable(L, narg, n + 1);
202− for (i=0; i < argc; i++) {
107+ for (i = 0; i < argc; i++) {
203108 lua_pushstring(L, argv[i]);
204109 lua_rawseti(L, -2, i - n);
205110 }
206111 return narg;
207112}
208113
209−
210−static int dofile (lua_State *L, const char *name) {
211− int status = luaL_loadfile(L, name);
212− if (status == LUA_OK) status = docall(L, 0, 0);
114+int dostring(lua_State *L, const char *s, const char *name) {
115+ int status = luaL_loadbuffer(L, s, strlen(s), name) || docall(L, 0, 1);
213116 return report(L, status);
214117}
215118
216−
217−static int dostring (lua_State *L, const char *s, const char *name) {
218− int status = luaL_loadbuffer(L, s, strlen(s), name);
219− if (status == LUA_OK) status = docall(L, 0, 0);
220− return report(L, status);
221−}
222−
223−
224−static int dolibrary (lua_State *L, const char *name) {
225− int status;
226− lua_getglobal(L, "require");
227− lua_pushstring(L, name);
228− status = docall(L, 1, 1); /* call 'require(name)' */
229− if (status == LUA_OK)
230− lua_setglobal(L, name); /* global[name] = require return */
231− return report(L, status);
232−}
233−
234−
235−static const char *get_prompt (lua_State *L, int firstline) {
119+static const char *get_prompt(lua_State *L, int firstline) {
236120 const char *p;
237− lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2");
121+ lua_getfield(L, LUA_GLOBALSINDEX, firstline ? "_PROMPT" : "_PROMPT2");
238122 p = lua_tostring(L, -1);
239− if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2);
123+ if (p == NULL)
124+ p = (firstline ? LUA_PROMPT : LUA_PROMPT2);
125+ lua_pop(L, 1); /* remove global */
240126 return p;
241127}
242128
243−/* mark in error messages for incomplete statements */
244−#define EOFMARK "<eof>"
245−#define marklen (sizeof(EOFMARK)/sizeof(char) - 1)
246−
247−static int incomplete (lua_State *L, int status) {
129+static int incomplete(lua_State *L, int status) {
248130 if (status == LUA_ERRSYNTAX) {
249131 size_t lmsg;
250132 const char *msg = lua_tolstring(L, -1, &lmsg);
251− if (lmsg >= marklen && strcmp(msg + lmsg - marklen, EOFMARK) == 0) {
133+ const char *tp = msg + lmsg - (sizeof(LUA_QL("<eof>")) - 1);
134+ if (strstr(msg, LUA_QL("<eof>")) == tp) {
252135 lua_pop(L, 1);
253136 return 1;
254137 }
255138 }
256− return 0; /* else... */
257−}
258139
140+ return 0; /* else... */
141+}
259142
260−static int pushline (lua_State *L, int firstline) {
143+static int pushline(lua_State *L, int firstline) {
261144 char buffer[LUA_MAXINPUT];
262145 char *b = buffer;
263146 size_t l;
264147 const char *prmt = get_prompt(L, firstline);
265− int readstatus = lua_readline(L, b, prmt);
266− lua_pop(L, 1); /* remove result from 'get_prompt' */
267− if (readstatus == 0)
268− return 0; /* no input */
148+ if (lua_readline(L, b, prmt) == 0)
149+ return 0; /* no input */
269150 l = strlen(b);
270− if (l > 0 && b[l-1] == '\n') /* line ends with newline? */
271− b[l-1] = '\0'; /* remove it */
272− if (firstline && b[0] == '=') /* first line starts with `=' ? */
273− lua_pushfstring(L, "return %s", b+1); /* change it to `return' */
151+ if (l > 0 && b[l - 1] == '\n') /* line ends with newline? */
152+ b[l - 1] = '\0'; /* remove it */
153+ if (firstline && b[0] == '=') /* first line starts with `=' ? */
154+ lua_pushfstring(L, "return %s", b + 1); /* change it to `return' */
274155 else
275156 lua_pushstring(L, b);
276157 lua_freeline(L, b);
277158 return 1;
278159}
279160
161+static int try_expression(lua_State *L) {
162+ lua_pushliteral(L, "return ");
163+ lua_pushvalue(L, 1);
164+ lua_concat(L, 2);
280165
281−static int loadline (lua_State *L) {
282− int status;
166+ int rstatus =
167+ luaL_loadbuffer(L, lua_tostring(L, -1), lua_strlen(L, -1), "=stdin");
168+
169+ if (rstatus) {
170+ lua_pop(L, 2);
171+ return 1;
172+ }
173+
174+ lua_remove(L, 2);
175+
176+ return 0;
177+}
178+
179+static int loadline(lua_State *L) {
180+ int status = 0;
283181 lua_settop(L, 0);
284182 if (!pushline(L, 1))
285− return -1; /* no input */
286− for (;;) { /* repeat until gets a complete line */
287− size_t l;
288− const char *line = lua_tolstring(L, 1, &l);
289− status = luaL_loadbuffer(L, line, l, "=stdin");
290− if (!incomplete(L, status)) break; /* cannot try to add lines? */
291− if (!pushline(L, 0)) /* no more input? */
183+ return -1; /* no input */
184+
185+ for (;;) { /* repeat until gets a complete line */
186+ status = try_expression(L);
187+ if (!status)
188+ break;
189+
190+ status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=stdin");
191+
192+ if (!incomplete(L, status))
193+ break; /* cannot try to add lines? */
194+
195+ if (!pushline(L, 0)) /* no more input? */
292196 return -1;
293− lua_pushliteral(L, "\n"); /* add a new line... */
294− lua_insert(L, -2); /* ...between the two lines */
295− lua_concat(L, 3); /* join them */
197+ lua_pushliteral(L, "\n"); /* add a new line... */
198+ lua_insert(L, -2); /* ...between the two lines */
199+ lua_concat(L, 3); /* join them */
296200 }
201+
297202 lua_saveline(L, 1);
298− lua_remove(L, 1); /* remove line */
203+ lua_remove(L, 1); /* remove line */
299204 return status;
300205}
301206
302−
303−void dotty (lua_State *L) {
207+void dotty(lua_State *L) {
304208 int status;
305209 const char *oldprogname = progname;
306210 progname = NULL;
307211 while ((status = loadline(L)) != -1) {
308− if (status == LUA_OK) status = docall(L, 0, LUA_MULTRET);
212+ if (status == 0)
213+ status = docall(L, 0, 0);
309214 report(L, status);
310− if (status == LUA_OK && lua_gettop(L) > 0) { /* any result to print? */
311− luaL_checkstack(L, LUA_MINSTACK, "too many results to print");
215+ if (status == 0 && lua_gettop(L) > 0) { /* any result to print? */
312216 lua_getglobal(L, "print");
313217 lua_insert(L, 1);
314− if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != LUA_OK)
315− l_message(progname, lua_pushfstring(L,
316− "error calling " LUA_QL("print") " (%s)",
317− lua_tostring(L, -1)));
218+ if (lua_pcall(L, lua_gettop(L) - 1, 0, 0) != 0)
219+ l_message(progname,
220+ lua_pushfstring(L, "error calling " LUA_QL("print") " (%s)",
221+ lua_tostring(L, -1)));
318222 }
319223 }
320− lua_settop(L, 0); /* clear stack */
321− luai_writeline();
224+ lua_settop(L, 0); /* clear stack */
225+ fputs("\n", stdout);
226+ fflush(stdout);
322227 progname = oldprogname;
323228}
324229
325−
326−int handle_script (lua_State *L, char **argv, int n) {
230+int handle_script(lua_State *L, char **argv, int n) {
327231 int status;
328232 const char *fname;
329− int narg = getargs(L, argv, n); /* collect arguments */
233+ int narg = getargs(L, argv, n); /* collect arguments */
330234 lua_setglobal(L, "arg");
331235 fname = argv[n];
332− if (strcmp(fname, "-") == 0 && strcmp(argv[n-1], "--") != 0)
333− fname = NULL; /* stdin */
236+ if (strcmp(fname, "-") == 0 && strcmp(argv[n - 1], "--") != 0)
237+ fname = NULL; /* stdin */
334238 status = luaL_loadfile(L, fname);
335− lua_insert(L, -(narg+1));
336− if (status == LUA_OK)
337− status = docall(L, narg, LUA_MULTRET);
239+ lua_insert(L, -(narg + 1));
240+ if (status == 0)
241+ status = docall(L, narg, 0);
338242 else
339243 lua_pop(L, narg);
340244 return report(L, status);
341245}
342−
343−
344−/* check that argument has no extra characters at the end */
345−#define noextrachars(x) {if ((x)[2] != '\0') return -1;}
346−
347−
348−/* indices of various argument indicators in array args */
349−#define has_i 0 /* -i */
350−#define has_v 1 /* -v */
351−#define has_e 2 /* -e */
352−#define has_E 3 /* -E */
353−
354−#define num_has 4 /* number of 'has_*' */
355−
356−
357−static int collectargs (char **argv, int *args) {
358− int i;
359− for (i = 1; argv[i] != NULL; i++) {
360− if (argv[i][0] != '-') /* not an option? */
361− return i;
362− switch (argv[i][1]) { /* option */
363− case '-':
364− noextrachars(argv[i]);
365− return (argv[i+1] != NULL ? i+1 : 0);
366− case '\0':
367− return i;
368− case 'E':
369− args[has_E] = 1;
370− break;
371− case 'i':
372− noextrachars(argv[i]);
373− args[has_i] = 1; /* go through */
374− case 'v':
375− noextrachars(argv[i]);
376− args[has_v] = 1;
377− break;
378− case 'e':
379− args[has_e] = 1; /* go through */
380− case 'l': /* both options need an argument */
381− if (argv[i][2] == '\0') { /* no concatenated argument? */
382− i++; /* try next 'argv' */
383− if (argv[i] == NULL || argv[i][0] == '-')
384− return -(i - 1); /* no next argument or it is another option */
385− }
386− break;
387− default: /* invalid option; return its index... */
388− return -i; /* ...as a negative value */
389− }
390− }
391− return 0;
392−}
393−
394−
395−static int runargs (lua_State *L, char **argv, int n) {
396− int i;
397− for (i = 1; i < n; i++) {
398− lua_assert(argv[i][0] == '-');
399− switch (argv[i][1]) { /* option */
400− case 'e': {
401− const char *chunk = argv[i] + 2;
402− if (*chunk == '\0') chunk = argv[++i];
403− lua_assert(chunk != NULL);
404− if (dostring(L, chunk, "=(command line)") != LUA_OK)
405− return 0;
406− break;
407− }
408− case 'l': {
409− const char *filename = argv[i] + 2;
410− if (*filename == '\0') filename = argv[++i];
411− lua_assert(filename != NULL);
412− if (dolibrary(L, filename) != LUA_OK)
413− return 0; /* stop if file fails */
414− break;
415− }
416− default: break;
417− }
418− }
419− return 1;
420−}
421−
422−
423−static int handle_luainit (lua_State *L) {
424− const char *name = "=" LUA_INITVERSION;
425− const char *init = getenv(name + 1);
426− if (init == NULL) {
427− name = "=" LUA_INIT;
428− init = getenv(name + 1); /* try alternative name */
429− }
430− if (init == NULL) return LUA_OK;
431− else if (init[0] == '@')
432− return dofile(L, init+1);
433− else
434− return dostring(L, init, name);
435−}
436−
437−
438−int pmain (lua_State *L) {
439− int argc = (int)lua_tointeger(L, 1);
440− char **argv = (char **)lua_touserdata(L, 2);
441− int script;
442− int args[num_has];
443− args[has_i] = args[has_v] = args[has_e] = args[has_E] = 0;
444− if (argv[0] && argv[0][0]) progname = argv[0];
445− script = collectargs(argv, args);
446− if (script < 0) { /* invalid arg? */
447− print_usage(argv[-script]);
448− return 0;
449− }
450− if (args[has_v]) print_version();
451− if (args[has_E]) { /* option '-E'? */
452− lua_pushboolean(L, 1); /* signal for libraries to ignore env. vars. */
453− lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
454− }
455− /* open standard libraries */
456− luaL_checkversion(L);
457− lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */
458− luaL_openlibs(L); /* open libraries */
459− lua_gc(L, LUA_GCRESTART, 0);
460− if (!args[has_E] && handle_luainit(L) != LUA_OK)
461− return 0; /* error running LUA_INIT */
462− /* execute arguments -e and -l */
463− if (!runargs(L, argv, (script > 0) ? script : argc)) return 0;
464− /* execute main script (if there is one) */
465− if (script && handle_script(L, argv, script) != LUA_OK) return 0;
466− if (args[has_i]) /* -i option? */
467− dotty(L);
468− else if (script == 0 && !args[has_e] && !args[has_v]) { /* no arguments? */
469− if (lua_stdin_is_tty()) {
470− print_version();
471− dotty(L);
472− }
473− else dofile(L, NULL); /* executes stdin as a file */
474− }
475− lua_pushboolean(L, 1); /* signal no errors */
476− return 1;
477−}
478−
479−
480−int lua_main (int argc, char **argv) {
481− int status, result;
482− lua_State *L = luaL_newstate(); /* create state */
483− if (L == NULL) {
484− l_message(argv[0], "cannot create state: not enough memory");
485− return EXIT_FAILURE;
486− }
487− /* call 'pmain' in protected mode */
488− lua_pushcfunction(L, &pmain);
489− lua_pushinteger(L, argc); /* 1st argument */
490− lua_pushlightuserdata(L, argv); /* 2nd argument */
491− status = lua_pcall(L, 2, 1, 0);
492− result = lua_toboolean(L, -1); /* get result */
493− finalreport(L, status);
494− lua_close(L);
495− return (result && status == LUA_OK) ? EXIT_SUCCESS : EXIT_FAILURE;
496−}
497−