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/*
** $Id: ldblib.c,v 1.1 1999/01/08 16:47:44 roberto Exp roberto $
** Interface from Lua to its debug API
** See Copyright Notice in lua.h
*/
#include <stdlib.h>
#include <string.h>
#include "lauxlib.h"
#include "lua.h"
#include "luadebug.h"
#include "lualib.h"
static void settabss (lua_Object t, char *i, char *v) {
lua_pushobject(t);
lua_pushstring(i);
lua_pushstring(v);
lua_settable();
}
static void settabsi (lua_Object t, char *i, int v) {
lua_pushobject(t);
lua_pushstring(i);
lua_pushnumber(v);
lua_settable();
}
static lua_Object getfuncinfo (lua_Object func) {
lua_Object result = lua_createtable();
char *name;
int line;
lua_funcinfo(func, &name, &line);
if (line == -1) /* C function? */
settabss(result, "kind", "C");
else if (line == 0) { /* "main"? */
settabss(result, "kind", "chunk");
settabss(result, "name", name);
}
else { /* Lua function */
settabss(result, "kind", "Lua");
settabsi(result, "def_line", line);
settabss(result, "def_chunk", name);
}
if (line != 0) { /* is it not a "main"? */
char *kind = lua_getobjname(func, &name);
if (*kind) {
settabss(result, "name", name);
settabss(result, "where", kind);
}
}
return result;
}
static void getstack (void) {
lua_Object func = lua_stackedfunction(luaL_check_int(1));
if (func == LUA_NOOBJECT) /* level out of range? */
return;
else {
lua_Object result = getfuncinfo(func);
int currline = lua_currentline(func);
if (currline > 0)
settabsi(result, "current", currline);
lua_pushobject(result);
}
}
static void funcinfo (void) {
lua_pushobject(getfuncinfo(luaL_functionarg(1)));
}
static int findlocal (lua_Object func, int arg) {
lua_Object v = lua_getparam(arg);
if (lua_isnumber(v))
return (int)lua_getnumber(v);
else {
char *name = luaL_check_string(arg);
int i = 0;
int result = -1;
char *vname;
while (lua_getlocal(func, ++i, &vname) != LUA_NOOBJECT) {
if (strcmp(name, vname) == 0)
result = i; /* keep looping to get the last var with this name */
}
if (result == -1)
luaL_verror("no local variable `%.50s' at given level", name);
return result;
}
}
static void getlocal (void) {
lua_Object func = lua_stackedfunction(luaL_check_int(1));
lua_Object val;
char *name;
if (func == LUA_NOOBJECT) /* level out of range? */
return; /* return nil */
else if (lua_getparam(2) != LUA_NOOBJECT) { /* 2nd argument? */
if ((val = lua_getlocal(func, findlocal(func, 2), &name)) != LUA_NOOBJECT) {
lua_pushobject(val);
lua_pushstring(name);
}
/* else return nil */
}
else { /* collect all locals in a table */
lua_Object result = lua_createtable();
int i;
for (i=1; ;i++) {
if ((val = lua_getlocal(func, i, &name)) == LUA_NOOBJECT)
break;
lua_pushobject(result);
lua_pushstring(name);
lua_pushobject(val);
lua_settable(); /* result[name] = value */
}
lua_pushobject(result);
}
}
static void setlocal (void) {
lua_Object func = lua_stackedfunction(luaL_check_int(1));
int numvar;
luaL_arg_check(func != LUA_NOOBJECT, 1, "level out of range");
numvar = findlocal(func, 2);
lua_pushobject(luaL_nonnullarg(3));
if (!lua_setlocal(func, numvar))
lua_error("no such local variable");
}
static int linehook = -1; /* Lua reference to line hook function */
static int callhook = -1; /* Lua reference to call hook function */
static void dohook (int ref) {
lua_LHFunction oldlinehook = lua_linehook; /* save old hooks */
lua_CHFunction oldcallhook = lua_callhook;
lua_linehook = NULL; lua_callhook = NULL; /* to avoid recusive calls */
lua_callfunction(lua_getref(ref));
lua_linehook = oldlinehook; /* restore old hooks */
lua_callhook = oldcallhook;
}
static void linef (int line) {
lua_pushnumber(line);
dohook(linehook);
}
static void callf (lua_Function func, char *file, int line) {
if (func != LUA_NOOBJECT) {
lua_pushobject(func);
lua_pushstring(file);
lua_pushnumber(line);
}
dohook(callhook);
}
static void setcallhook (void) {
lua_Object f = lua_getparam(1);
lua_unref(callhook);
if (f == LUA_NOOBJECT) {
callhook = -1;
lua_callhook = NULL;
}
else {
lua_pushobject(f);
callhook = lua_ref(1);
lua_callhook = callf;
}
}
static void setlinehook (void) {
lua_Object f = lua_getparam(1);
lua_unref(linehook);
if (f == LUA_NOOBJECT) {
linehook = -1;
lua_linehook = NULL;
}
else {
lua_pushobject(f);
linehook = lua_ref(1);
lua_linehook = linef;
}
}
static struct luaL_reg dblib[] = {
{"funcinfo", funcinfo},
{"getlocal", getlocal},
{"getstack", getstack},
{"setcallhook", setcallhook},
{"setlinehook", setlinehook},
{"setlocal", setlocal}
};
void lua_dblibopen (void) {
luaL_openlib(dblib, (sizeof(dblib)/sizeof(dblib[0])));
}
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