assaultcube-/source/src/command.cpp

// command.cpp: implements the parsing and execution of a tiny script language which
// is largely backwards compatible with the quake console language.

#include "cube.h"

bool allowidentaccess(ident *id);
char *exchangestr(char *o, const char *n) { delete[] o; return newstring(n); }
void scripterr();

vector<int> contextstack;
bool contextsealed = false;
bool contextisolated[IEXC_NUM] = { false };
int execcontext;

bool loop_break = false, loop_skip = false;             // break or continue (skip) current loop
int loop_level = 0;                                      // avoid bad calls of break & continue

hashtable<const char *, ident> *idents = NULL;          // contains ALL vars/commands/aliases

VAR(persistidents, 0, 1, 1);

bool per_idents = true, neverpersist = false;
COMMANDF(per_idents, "i", (int *on) {
    per_idents = neverpersist ? false : (*on != 0);
});

void clearstack(ident &id)
{
    identstack *stack = id.stack;
    while(stack)
    {
        delete[] stack->action;
        identstack *tmp = stack;
        stack = stack->next;
        delete tmp;
    }
    id.stack = NULL;
}

void pushident(ident &id, char *val, int context = execcontext)
{
    if(id.type != ID_ALIAS) return;
    identstack *stack = new identstack;
    stack->action = id.executing==id.action ? newstring(id.action) : id.action;
    stack->context = id.context;
    stack->next = id.stack;
    id.stack = stack;
    id.action = val;
    id.context = context;
}

void popident(ident &id)
{
    if(id.type != ID_ALIAS || !id.stack) return;
    if(id.action != id.executing) delete[] id.action;
    identstack *stack = id.stack;
    id.action = stack->action;
    id.stack = stack->next;
    id.context = stack->context;
    delete stack;
}

ident *newident(const char *name, int context = execcontext)
{
    ident *id = idents->access(name);
    if(!id)
    {
        ident init(ID_ALIAS, newstring(name), newstring(""), per_idents, context);
        id = &idents->access(init.name, init);
    }
    return id;
}

void pusha(const char *name, char *action)
{
    ident *id = newident(name, execcontext);
    if(contextisolated[execcontext] && execcontext > id->context)
    {
        conoutf("cannot redefine alias %s in this execution context", id->name);
        scripterr();
        return;
    }
    pushident(*id, action);
}

void push(const char *name, const char *action)
{
    pusha(name, newstring(action));
}

void pop(const char *name)
{
    ident *id = idents->access(name);
    if(!id) return;
    if(contextisolated[execcontext] && execcontext > id->context)
    {
        conoutf("cannot redefine alias %s in this execution context", id->name);
        scripterr();
        return;
    }
    popident(*id);
}

COMMAND(push, "ss");
COMMAND(pop, "s");
void delalias(const char *name)
{
    ident *id = idents->access(name);
    if(!id || id->type != ID_ALIAS) return;
    if(contextisolated[execcontext] && execcontext > id->context)
    {
        conoutf("cannot remove alias %s in this execution context", id->name);
        scripterr();
        return;
    }
    idents->remove(name);
}
COMMAND(delalias, "s");

void alias(const char *name, const char *action, bool constant)
{
    ident *b = idents->access(name);
    if(!b)
    {
        ident b(ID_ALIAS, newstring(name), newstring(action), persistidents && !constant, execcontext);
        b.isconst = constant;
        idents->access(b.name, b);
        return;
    }
    else if(b->type==ID_ALIAS)
    {
        if(contextisolated[execcontext] && execcontext > b->context)
        {
            conoutf("cannot redefine alias %s in this execution context", b->name);
            scripterr();
            return;
        }

        if(b->isconst)
        {
            conoutf("alias %s is a constant and cannot be redefined", b->name);
            scripterr();
            return;
        }

        b->isconst = constant;
        if(!constant || (action && action[0]))
        {
            if(b->action!=b->executing) delete[] b->action;
            b->action = newstring(action);
            b->persist = persistidents != 0;
        }
    }
    else
    {
        conoutf("cannot redefine builtin %s with an alias", name);
        scripterr();
    }
}

COMMANDF(alias, "ss", (const char *name, const char *action) { alias(name, action, false); });
COMMANDF(const, "ss", (const char *name, const char *action) { alias(name, action, true); });

COMMANDF(checkalias, "s", (const char *name) { intret(getalias(name) ? 1 : 0); });
COMMANDF(isconst, "s", (const char *name) { ident *id = idents->access(name); intret(id && id->isconst ? 1 : 0); });

// variable's and commands are registered through globals, see cube.h

int variable(const char *name, int minval, int cur, int maxval, int *storage, void (*fun)(), bool persist)
{
    if(!idents) idents = new hashtable<const char *, ident>;
    ident v(ID_VAR, name, minval, maxval, storage, fun, persist, IEXC_CORE);
    idents->access(name, v);
    return cur;
}

float fvariable(const char *name, float minval, float cur, float maxval, float *storage, void (*fun)(), bool persist)
{
    if(!idents) idents = new hashtable<const char *, ident>;
    ident v(ID_FVAR, name, minval, maxval, storage, fun, persist, IEXC_CORE);
    idents->access(name, v);
    return cur;
}

char *svariable(const char *name, const char *cur, char **storage, void (*fun)(), bool persist)
{
    if(!idents) idents = new hashtable<const char *, ident>;
    ident v(ID_SVAR, name, storage, fun, persist, IEXC_CORE);
    idents->access(name, v);
    return newstring(cur);
}

#define _GETVAR(id, vartype, name, retval) \
    ident *id = idents->access(name); \
    if(!id || id->type!=vartype) return retval;
#define GETVAR(id, name, retval) _GETVAR(id, ID_VAR, name, retval)
void setvar(const char *name, int i, bool dofunc)
{
    GETVAR(id, name, );
    *id->storage.i = clamp(i, id->minval, id->maxval);
    if(dofunc && id->fun) ((void (__cdecl *)())id->fun)();            // call trigger function if available
}
void setfvar(const char *name, float f, bool dofunc)
{
    _GETVAR(id, ID_FVAR, name, );
    *id->storage.f = clamp(f, id->minvalf, id->maxvalf);
    if(dofunc && id->fun) ((void (__cdecl *)())id->fun)();            // call trigger function if available
}
void setsvar(const char *name, const char *str, bool dofunc)
{
    _GETVAR(id, ID_SVAR, name, );
    *id->storage.s = exchangestr(*id->storage.s, str);
    if(dofunc && id->fun) ((void (__cdecl *)())id->fun)();            // call trigger function if available
}

void modifyvar(const char *name, int arg, char op)
{
    ident *id = idents->access(name);
    if(!id) return;
    if(!allowidentaccess(id))
    {
        conoutf("not allowed in this execution context: %s", id->name);
        scripterr();
        return;
    }
    if((id->type == ID_VAR && id->minval > id->maxval) || (id->type == ID_FVAR && id->minvalf > id->maxvalf)) { conoutf("variable %s is read-only", id->name); return; }
    int val = 0;
    switch(id->type)
    {
        case ID_VAR: val = *id->storage.i; break;
        case ID_FVAR: val = int(*id->storage.f); break;
        case ID_SVAR: val = ATOI(*id->storage.s); break;
        case ID_ALIAS: val = ATOI(id->action); break;
    }
    switch(op)
    {
        case '+': val += arg; break;
        case '-': val -= arg; break;
        case '*': val *= arg; break;
        case '/': val = arg ? val/arg : 0; break;
    }
    switch(id->type)
    {
        case ID_VAR: *id->storage.i = clamp(val, id->minval, id->maxval); break;
        case ID_FVAR: *id->storage.f = clamp((float)val, id->minvalf, id->maxvalf); break;
        case ID_SVAR: { string str; itoa(str, val); *id->storage.s = exchangestr(*id->storage.s, str); break; }
        case ID_ALIAS: { string str; itoa(str, val); alias(name, str); return; }
        default: return;
    }
    if(id->fun) ((void (__cdecl *)())id->fun)();
}

void modifyfvar(const char *name, float arg, char op)
{
    ident *id = idents->access(name);
    if(!id) return;
    if(!allowidentaccess(id))
    {
        conoutf("not allowed in this execution context: %s", id->name);
        scripterr();
        return;
    }
    if((id->type == ID_VAR && id->minval > id->maxval) || (id->type == ID_FVAR && id->minvalf > id->maxvalf)) { conoutf("variable %s is read-only", id->name); return; }
    float val = 0;
    switch(id->type)
    {
        case ID_VAR: val = *id->storage.i; break;
        case ID_FVAR: val = *id->storage.f; break;
        case ID_SVAR: val = atof(*id->storage.s); break;
        case ID_ALIAS: val = atof(id->action); break;
    }
    switch(op)
    {
        case '+': val += arg; break;
        case '-': val -= arg; break;
        case '*': val *= arg; break;
        case '/': val = (arg == 0.0f) ? 0 : val/arg; break;
    }
    switch(id->type)
    {
        case ID_VAR: *id->storage.i = clamp((int)val, id->minval, id->maxval); break;
        case ID_FVAR: *id->storage.f = clamp(val, id->minvalf, id->maxvalf); break;
        case ID_SVAR: *id->storage.s = exchangestr(*id->storage.s, floatstr(val)); break;
        case ID_ALIAS: alias(name, floatstr(val)); return;
        default: return;
    }
    if(id->fun) ((void (__cdecl *)())id->fun)();
}

void addeq(char *name, int *arg) { modifyvar(name, *arg, '+'); }
void subeq(char *name, int *arg) { modifyvar(name, *arg, '-'); }
void muleq(char *name, int *arg) { modifyvar(name, *arg, '*'); }
void diveq(char *name, int *arg) { modifyvar(name, *arg, '/'); }
void addeqf(char *name, float *arg) { modifyfvar(name, *arg, '+'); }
void subeqf(char *name, float *arg) { modifyfvar(name, *arg, '-'); }
void muleqf(char *name, float *arg) { modifyfvar(name, *arg, '*'); }
void diveqf(char *name, float *arg) { modifyfvar(name, *arg, '/'); }

COMMANDN(+=, addeq, "si");
COMMANDN(-=, subeq, "si");
COMMANDN(*=, muleq, "si");
COMMANDN(div=, diveq, "si");
COMMANDN(+=f, addeqf, "sf");
COMMANDN(-=f, subeqf, "sf");
COMMANDN(*=f, muleqf, "sf");
COMMANDN(div=f, diveqf, "sf");

int getvar(const char *name)
{
    GETVAR(id, name, 0);
    return *id->storage.i;
}

bool identexists(const char *name) { return idents->access(name)!=NULL; }

const char *getalias(const char *name)
{
    ident *i = idents->access(name);
    return i && i->type==ID_ALIAS ? i->action : NULL;
}
void _getalias(char *name)
{
    string o;
    ident *id = idents->access(name);
    const char *action = getalias(name);
    if(id)
    {
        switch(id->type)
        {
            case ID_VAR:
                formatstring(o)("%d", *id->storage.i);
                result(o);
                break;
            case ID_FVAR:
                formatstring(o)("%.3f", *id->storage.f);
                result(o);
                break;
            case ID_SVAR:
                formatstring(o)("%s", *id->storage.s);
                result(o);
                break;
            case ID_ALIAS:
                result(action ? action : "");
                break;
            default: break;
        }
    }
}
COMMANDN(getalias, _getalias, "s");

COMMANDF(isIdent, "s", (char *name) { intret(identexists(name) ? 1 : 0); });

bool addcommand(const char *name, void (*fun)(), const char *sig)
{
    if(!idents) idents = new hashtable<const char *, ident>;
    ident c(ID_COMMAND, name, fun, sig, IEXC_CORE);
    idents->access(name, c);
    return false;
}

char *parseexp(const char *&p, int right)             // parse any nested set of () or []
{
    int left = *p++;
    const char *word = p;
    bool quot = false;
    for(int brak = 1; brak; )
    {
        int c = *p++;
        if(c==left && !quot) brak++;
        else if(c=='"') quot = !quot;
        else if(c==right && !quot) brak--;
        else if(!c)
        {
            p--;
            conoutf("missing \"%c\"", right);
            scripterr();
            return NULL;
        }
    }
    char *s = newstring(word, p-word-1);
    if(left=='(')
    {
        char *ret = executeret(s); // evaluate () exps directly, and substitute result
        delete[] s;
        s = ret ? ret : newstring("");
    }
    return s;
}

char *lookup(char *n)                           // find value of ident referenced with $ in exp
{
    ident *id = idents->access(n+1);
    if(id) switch(id->type)
    {
        case ID_VAR: { string t; itoa(t, *id->storage.i); return exchangestr(n, t); }
        case ID_FVAR: return exchangestr(n, floatstr(*id->storage.f));
        case ID_SVAR: return exchangestr(n, *id->storage.s);
        case ID_ALIAS: return exchangestr(n, id->action);
    }
    conoutf("unknown alias lookup: %s", n+1);
    scripterr();
    return n;
}

char *parseword(const char *&p, int arg, int &infix)                       // parse single argument, including expressions
{
    p += strspn(p, " \t\r");
    if(p[0]=='/' && p[1]=='/') p += strcspn(p, "\n\0");
    if(*p=='\"')
    {
        p++;
        const char *word = p;
        p += strcspn(p, "\"\r\n\0");
        char *s = newstring(word, p-word);
        if(*p=='\"') p++;
        return s;
    }
    if(*p=='(') return parseexp(p, ')');
    if(*p=='[') return parseexp(p, ']');
    const char *word = p;
    p += strcspn(p, "; \t\r\n\0");
    if(p-word==0) return NULL;
    if(arg==1 && p-word==1) switch(*word)
    {
        case '=': infix = *word; break;
    }
    char *s = newstring(word, p-word);
    if(*s=='$') return lookup(s);
    return s;
}

char *conc(char **w, int n, bool space)
{
    int len = space ? max(n-1, 0) : 0;
    loopj(n) len += (int)strlen(w[j]);
    char *r = newstring("", len);
    loopi(n)
    {
        strcat(r, w[i]);  // make string-list out of all arguments
        if(i==n-1) break;
        bool col = w[i][0] == '\f' && w[i][1] && w[i][2] == '\0';
        if(space && !col) strcat(r, " ");
    }
    return r;
}

VARN(numargs, _numargs, 25, 0, 0);

char *commandret = NULL;

void intret(int v)
{
    string t;
    itoa(t, v);
    commandret = newstring(t);
}

const char *floatstr(float v)
{
    static string l;
    ftoa(l, 0.5);
    static int n = 0;
    static string t[3];
    n = (n + 1)%3;
    ftoa(t[n], v);
    return t[n];
}


void floatret(float v)
{
    commandret = newstring(floatstr(v));
}

void result(const char *s) { commandret = newstring(s); }

#if 0
// seer : script evaluation excessive recursion
static int seer_count = 0; // count calls to executeret, check time every n1 (100) calls
static int seer_index = -1; // position in timestamp vector
vector<long long> seer_t1; // timestamp of last n2 (10) level-1 calls
vector<long long> seer_t2; // timestamp of last n3 (10) level-2 calls
#endif
char *executeret(const char *p)                            // all evaluation happens here, recursively
{
    if(!p || !p[0]) return NULL;
    bool noproblem = true;
#if 0
    if(execcontext>IEXC_CFG) // only PROMPT and MAP-CFG are checked for this, fooling with core/cfg at your own risk!
    {
        seer_count++;
        if(seer_count>=100)
        {
            seer_index = (seer_index+1)%10;
            long long cts = (long long) time(NULL);
            if(seer_t1.length()>=10) seer_t1[seer_index] = cts;
            seer_t1.add(cts);
            int lc = (seer_index+11)%10;
            if(lc<=seer_t1.length())
            {
                int dt = seer_t1[seer_index] - seer_t1[lc];
                if(abs(dt)<2)
                {
                    conoutf("SCRIPT EXECUTION warning [%d:%s]", &p, p);
                    seer_t2.add(seer_t1[seer_index]);
                    if(seer_t2.length() >= 10)
                    {
                        if(seer_t2[0] == seer_t2.last())
                        {
                            conoutf("SCRIPT EXECUTION in danger of crashing the client - dropping script [%s].", p);
                            noproblem = false;
                            seer_t2.shrink(0);
                            seer_t1.shrink(0);
                            seer_index = 0;
                        }
                    }
                }
            }
            seer_count = 0;
        }
    }
#endif
    const int MAXWORDS = 25;                    // limit, remove
    char *w[MAXWORDS];
    char *retval = NULL;
    #define setretval(v) { char *rv = v; if(rv) retval = rv; }
    if(noproblem) // if the "seer"-algorithm doesn't object
    {
        for(bool cont = true; cont;)                // for each ; seperated statement
        {
            if(loop_level && loop_skip) break;
            int numargs = MAXWORDS, infix = 0;
            loopi(MAXWORDS)                         // collect all argument values
            {
                w[i] = (char *)"";
                if(i>numargs) continue;
                char *s = parseword(p, i, infix);   // parse and evaluate exps
                if(s) w[i] = s;
                else numargs = i;
            }

            p += strcspn(p, ";\n\0");
            cont = *p++!=0;                         // more statements if this isn't the end of the string
            const char *c = w[0];
            if(!*c) continue;                       // empty statement

            DELETEA(retval);

            if(infix)
            {
                switch(infix)
                {
                    case '=':
                        DELETEA(w[1]);
                        swap(w[0], w[1]);
                        c = "alias";
                        break;
                }
            }

            ident *id = idents->access(c);
            if(!id)
            {
                if(!isdigit(*c) && ((*c!='+' && *c!='-' && *c!='.') || !isdigit(c[1])))
                {
                    conoutf("unknown command: %s", c);
                    scripterr();
                }
                setretval(newstring(c));
            }
            else
            {
                if(!allowidentaccess(id))
                {
                    conoutf("not allowed in this execution context: %s", id->name);
                    scripterr();
                    continue;
                }

                switch(id->type)
                {
                    case ID_COMMAND:                    // game defined commands
                    {

                        if(strstr(id->sig, "v")) ((void (__cdecl *)(char **, int))id->fun)(&w[1], numargs-1);
                        else if(strstr(id->sig, "c") || strstr(id->sig, "w"))
                        {
                            char *r = conc(w+1, numargs-1, strstr(id->sig, "c") != NULL);
                            ((void (__cdecl *)(char *))id->fun)(r);
                            delete[] r;
                        }
                        else if(strstr(id->sig, "d"))
                        {
#ifndef STANDALONE
                            ((void (__cdecl *)(bool))id->fun)(addreleaseaction(id->name)!=NULL);
#endif
                        }
                        else
                        {
                            int ib1, ib2, ib3, ib4, ib5, ib6, ib7, ib8;
                            float fb1, fb2, fb3, fb4, fb5, fb6, fb7, fb8;
                            #define ARG(i) (id->sig[i-1] == 'i' ? ((void *)&(ib##i=strtol(w[i], NULL, 0))) : (id->sig[i-1] == 'f' ? ((void *)&(fb##i=atof(w[i]))) : (void *)w[i]))

                            switch(strlen(id->sig))                // use very ad-hoc function signature, and just call it
                            {
                                case 0: ((void (__cdecl *)())id->fun)(); break;
                                case 1: ((void (__cdecl *)(void*))id->fun)(ARG(1)); break;
                                case 2: ((void (__cdecl *)(void*, void*))id->fun)(ARG(1), ARG(2)); break;
                                case 3: ((void (__cdecl *)(void*, void*, void*))id->fun)(ARG(1), ARG(2), ARG(3)); break;
                                case 4: ((void (__cdecl *)(void*, void*, void*, void*))id->fun)(ARG(1), ARG(2), ARG(3), ARG(4)); break;
                                case 5: ((void (__cdecl *)(void*, void*, void*, void*, void*))id->fun)(ARG(1), ARG(2), ARG(3), ARG(4), ARG(5)); break;
                                case 6: ((void (__cdecl *)(void*, void*, void*, void*, void*, void*))id->fun)(ARG(1), ARG(2), ARG(3), ARG(4), ARG(5), ARG(6)); break;
                                case 7: ((void (__cdecl *)(void*, void*, void*, void*, void*, void*, void*))id->fun)(ARG(1), ARG(2), ARG(3), ARG(4), ARG(5), ARG(6), ARG(7)); break;
                                case 8: ((void (__cdecl *)(void*, void*, void*, void*, void*, void*, void*, void*))id->fun)(ARG(1), ARG(2), ARG(3), ARG(4), ARG(5), ARG(6), ARG(7), ARG(8)); break;
                                default: fatal("command %s has too many arguments (signature: %s)", id->name, id->sig); break;
                            }
                            #undef ARG
                        }

                        setretval(commandret);
                        commandret = NULL;
                        break;
                    }

                    case ID_VAR:                        // game defined variables
                        if(!w[1][0]) conoutf("%s = %d", c, *id->storage.i);      // var with no value just prints its current value
                        else if(id->minval>id->maxval) conoutf("variable %s is read-only", id->name);
                        else
                        {
                            int i1 = ATOI(w[1]);
                            if(i1<id->minval || i1>id->maxval)
                            {
                                i1 = i1<id->minval ? id->minval : id->maxval;       // clamp to valid range
                                conoutf("valid range for %s is %d..%d", id->name, id->minval, id->maxval);
                            }
                            *id->storage.i = i1;
                            if(id->fun) ((void (__cdecl *)())id->fun)();            // call trigger function if available
                        }
                        break;

                    case ID_FVAR:                        // game defined variables
                        if(!w[1][0]) conoutf("%s = %s", c, floatstr(*id->storage.f));      // var with no value just prints its current value
                        else if(id->minvalf>id->maxvalf) conoutf("variable %s is read-only", id->name);
                        else
                        {
                            float f1 = atof(w[1]);
                            if(f1<id->minvalf || f1>id->maxvalf)
                            {
                                f1 = f1<id->minvalf ? id->minvalf : id->maxvalf;       // clamp to valid range
                                conoutf("valid range for %s is %s..%s", id->name, floatstr(id->minvalf), floatstr(id->maxvalf));
                                //scripterr(); // Why throw this error here when it's not done for ID_VAR above? Only difference is datatype, both are "valid range errors". // Bukz 2011june04
                            }
                            *id->storage.f = f1;
                            if(id->fun) ((void (__cdecl *)())id->fun)();            // call trigger function if available
                        }
                        break;

                    case ID_SVAR:                        // game defined variables
                        if(!w[1][0]) conoutf(strchr(*id->storage.s, '"') ? "%s = [%s]" : "%s = \"%s\"", c, *id->storage.s); // var with no value just prints its current value
                        else
                        {
                            *id->storage.s = exchangestr(*id->storage.s, newstring(w[1]));
                            if(id->fun) ((void (__cdecl *)())id->fun)();            // call trigger function if available
                        }
                        break;

                    case ID_ALIAS:                              // alias, also used as functions and (global) variables
                        delete[] w[0];
                        static vector<ident *> argids;
                        for(int i = 1; i<numargs; i++)
                        {
                            if(i > argids.length())
                            {
                                defformatstring(argname)("arg%d", i);
                                argids.add(newident(argname, IEXC_CORE));
                            }
                            pushident(*argids[i-1], w[i]); // set any arguments as (global) arg values so functions can access them
                        }
                        _numargs = numargs-1;
                        char *wasexecuting = id->executing;
                        id->executing = id->action;
                        setretval(executeret(id->action));
                        if(id->executing!=id->action && id->executing!=wasexecuting) delete[] id->executing;
                        id->executing = wasexecuting;
                        for(int i = 1; i<numargs; i++) popident(*argids[i-1]);
                        continue;
                }
            }
            loopj(numargs) if(w[j]) delete[] w[j];
        }
    }
    return retval;
}

int execute(const char *p)
{
    char *ret = executeret(p);
    int i = 0;
    if(ret) { i = ATOI(ret); delete[] ret; }
    return i;
}

bool exechook(int context, const char *ident, const char *body,...)  // execute cubescript hook if available and allowed in current context/gamemode
{ // always use one of HOOK_SP_MP, HOOK_SP or HOOK_MP and then OR them (as needed) with HOOK_TEAM, HOOK_NOTEAM, HOOK_BOTMODE, HOOK_FLAGMODE, HOOK_ARENA
    if(multiplayer(NULL) && (context & HOOK_FLAGMASK) != HOOK_MP && (context & HOOK_FLAGMASK) != HOOK_SP_MP) return false; // hook is singleplayer-only
    if(((context & HOOK_TEAM) && !m_teammode) ||
       ((context & HOOK_NOTEAM) && m_teammode) ||
       ((context & HOOK_BOTMODE) && !m_botmode) ||
       ((context & HOOK_FLAGMODE) && m_flags) ||
       ((context & HOOK_ARENA) && m_arena)) return false; // wrong gamemode
    if(identexists(ident))
    {
        defvformatstring(arglist, body, body);
        defformatstring(execbody)("%s%c%s", ident, *arglist ? ' ' : '\0', arglist);
        execute(execbody);
        return true;
    }
    return false;
}

#ifndef STANDALONE
// tab-completion of all idents
// always works at the end of the command line - the cursor position does not matter

static int completesize = -1, nickcompletesize = -1;

void resetcomplete()
{
    nickcompletesize = completesize = -1;
}

bool nickcomplete(char *s, bool reversedirection)
{
    static int nickcompleteidx;
    if(!players.length()) return false;

    char *cp = strrchr(s, ' '); // find last space
    cp = cp ? cp + 1 : s;

    if(nickcompletesize < 0)
    {
        nickcompletesize = (int)strlen(cp);
        nickcompleteidx = reversedirection ? 0 : -1;
    }

    vector<int> matchingnames;
    loopv(players) if(players[i] && !strncasecmp(players[i]->name, cp, nickcompletesize)) matchingnames.add(i);   // find all matching player names first
    if(matchingnames.length())
    {
        nickcompleteidx += reversedirection ? matchingnames.length() - 1 : 1;
        nickcompleteidx %= matchingnames.length();
        *cp = '\0';
        concatstring(s, players[matchingnames[nickcompleteidx]]->name);
        return true;
    }
    return false;
}

enum { COMPLETE_FILE = 0, COMPLETE_LIST, COMPLETE_NICK };

struct completekey
{
    int type;
    const char *dir, *ext;

    completekey() {}
    completekey(int type, const char *dir, const char *ext) : type(type), dir(dir), ext(ext) {}
};

struct completeval
{
    int type;
    char *dir, *ext;
    vector<char *> dirlist;
    vector<char *> list;

    completeval(int type, const char *dir, const char *ext) : type(type), dir(dir && dir[0] ? newstring(dir) : NULL), ext(ext && ext[0] ? newstring(ext) : NULL) {}
    ~completeval() { DELETEA(dir); DELETEA(ext); dirlist.deletearrays(); list.deletearrays(); }
};

static inline bool htcmp(const completekey &x, const completekey &y)
{
    return x.type==y.type && (x.dir == y.dir || (x.dir && y.dir && !strcmp(x.dir, y.dir))) && (x.ext == y.ext || (x.ext && y.ext && !strcmp(x.ext, y.ext)));
}

static inline uint hthash(const completekey &k)
{
    return k.dir ? hthash(k.dir) + k.type : k.type;
}

static hashtable<completekey, completeval *> completedata;
static hashtable<char *, completeval *> completions;

void addcomplete(char *command, int type, char *dir, char *ext)
{
    if(type==COMPLETE_FILE)
    {
        int dirlen = (int)strlen(dir);
        while(dirlen > 0 && (dir[dirlen-1] == '/' || dir[dirlen-1] == '\\'))
            dir[--dirlen] = '\0';
        if(ext)
        {
            if(strchr(ext, '*')) ext[0] = '\0';
            if(!ext[0]) ext = NULL;
        }
    }
    completekey key(type, dir, ext);
    completeval **val = completedata.access(key);
    if(!val)
    {
        completeval *f = new completeval(type, dir, ext);
        if(type==COMPLETE_LIST) explodelist(dir, f->list);
        if(type==COMPLETE_FILE)
        {
            explodelist(dir, f->dirlist);
            loopv(f->dirlist)
            {
                char *dir = f->dirlist[i];
                int dirlen = (int)strlen(dir);
                while(dirlen > 0 && (dir[dirlen-1] == '/' || dir[dirlen-1] == '\\'))
                    dir[--dirlen] = '\0';
            }
        }
        val = &completedata[completekey(type, f->dir, f->ext)];
        *val = f;
    }
    completeval **hascomplete = completions.access(command);
    if(hascomplete) *hascomplete = *val;
    else completions[newstring(command)] = *val;
}

void addfilecomplete(char *command, char *dir, char *ext)
{
    addcomplete(command, COMPLETE_FILE, dir, ext);
}

void addlistcomplete(char *command, char *list)
{
    addcomplete(command, COMPLETE_LIST, list, NULL);
}

void addnickcomplete(char *command)
{
    addcomplete(command, COMPLETE_NICK, NULL, NULL);
}

COMMANDN(complete, addfilecomplete, "sss");
COMMANDN(listcomplete, addlistcomplete, "ss");
COMMANDN(nickcomplete, addnickcomplete, "s");

void commandcomplete(char *s, bool reversedirection)
{ // s is required to be of size "string"!
    static int completeidx;
    if(*s != '/')
    {
        string t;
        copystring(t, s);
        copystring(s, "/");
        concatstring(s, t);
    }
    if(!s[1]) return;

    // find start position of last command
    char *cmd = strrchr(s, ';'); // find last ';' (this will not always work properly, because it doesn't take quoted texts into account)
    if(!cmd) cmd = s;  // no ';' found: command starts after '/'

    char *openblock = strrchr(cmd + 1, '('), *closeblock = strrchr(cmd + 1, ')'); // find last open and closed parenthesis
    if(openblock && (!closeblock || closeblock < openblock)) cmd = openblock; // found opening parenthesis inside the command: assume, a new command starts here

    cmd += strspn(cmd + 1, " ") + 1;  // skip blanks and one of "/;( ", cmd now points to the first char of the command

    // check, if the command is complete, and we want argument completion instead
    char *arg = strrchr(cmd, ' ');  // find last space in command -> if there is one, we use argument completion

    completeval *cdata = NULL;
    if(arg)  // full command is present
    { // extract command name to find argument list
        string command;
        copystring(command, cmd);
        command[strcspn(cmd, " ")] = '\0';
        completeval **hascomplete = completions.access(command);
        if(hascomplete) cdata = *hascomplete;

        if(completesize < 0 && cdata && cdata->type == COMPLETE_FILE)
        { // get directory contents on first run
           cdata->list.deletearrays();
           vector<char *> files;
           loopv(cdata->dirlist)
           {
               listfiles(cdata->dirlist[i], cdata->ext, files);
               files.sort(stringsort);
               loopv(files) cdata->list.add(files[i]);
               files.setsize(0);
           }
        }
    }

    char *cp = arg ? arg + 1 : cmd; // part of string to complete
    if(completesize < 0)
    { // first run since resetcomplete()
        completesize = (int)strlen(cp);
        completeidx = reversedirection ? 0 : -1;
    }

    if(!arg)
    { // commandname completion
        vector<const char *> matchingidents;
        enumerate(*idents, ident, id,
            if(!strncasecmp(id.name, cp, completesize)) matchingidents.add(id.name);     // find all matching possibilities to get the list length (and give an opportunity to sort the list first)
        );
        if(matchingidents.length())
        {
            completeidx += reversedirection ? matchingidents.length() - 1 : 1;
            completeidx %= matchingidents.length();
            *cp = '\0';
            matchingidents.sort(stringsortignorecase);
            concatstring(s, matchingidents[completeidx]);
        }
    }
    else if(!cdata) return;
    else if(cdata->type == COMPLETE_NICK) nickcomplete(s, reversedirection);
    else
    { // argument completion
        vector<int> matchingargs;
        loopv(cdata->list) if(!strncasecmp(cdata->list[i], cp, completesize)) matchingargs.add(i);   // find all matching args first
        if(matchingargs.length())
        {
            completeidx += reversedirection ? matchingargs.length() - 1 : 1;
            completeidx %= matchingargs.length();
            *cp = '\0';
            concatstring(s, cdata->list[matchingargs[completeidx]]);
        }
    }
}

void complete(char *s, bool reversedirection)
{
    if(*s == '/' || !nickcomplete(s, reversedirection))
    {
        commandcomplete(s, reversedirection);
    }
}
#endif

const char *curcontext = NULL, *curinfo = NULL;

void scripterr()
{
    if(curcontext) conoutf("(%s: %s)", curcontext, curinfo);
    else conoutf("(from console or builtin)");
}

void setcontext(const char *context, const char *info)
{
    curcontext = context;
    curinfo = info;
}

void resetcontext()
{
    curcontext = curinfo = NULL;
}

bool execfile(const char *cfgfile)
{
    string s;
    copystring(s, cfgfile);
    setcontext("file", cfgfile);
    char *buf = loadfile(path(s), NULL);
    if(!buf)
    {
        resetcontext();
        return false;
    }
    execute(buf);
    delete[] buf;
    resetcontext();
    return true;
}

void exec(const char *cfgfile)
{
    if(!execfile(cfgfile)) conoutf("could not read \"%s\"", cfgfile);
}

void execdir(const char *dir)
{
        if(dir[0])
        {
            vector<char *> files;
            listfiles(dir, "cfg", files);
            loopv(files)
            {
                defformatstring(d)("%s/%s.cfg",dir,files[i]);
                exec(d);
            }
        }
}
COMMAND(execdir, "s");

// below the commands that implement a small imperative language. thanks to the semantics of
// () and [] expressions, any control construct can be defined trivially.

void ifthen(char *cond, char *thenp, char *elsep) { commandret = executeret(cond[0]!='0' ? thenp : elsep); }
void loopa(char *var, int *times, char *body)
{
    int t = *times;
    if(t<=0) return;
    ident *id = newident(var, execcontext);
    if(id->type!=ID_ALIAS) return;
    char *buf = newstring("0", 16);
    pushident(*id, buf);
    loop_level++;
    execute(body);
    if(loop_skip) loop_skip = false;
    if(loop_break) loop_break = false;
    else
    {
        loopi(t-1)
        {
            if(buf != id->action)
            {
                if(id->action != id->executing) delete[] id->action;
                id->action = buf = newstring(16);
            }
            itoa(id->action, i+1);
            execute(body);
            if(loop_skip) loop_skip = false;
            if(loop_break)
            {
                loop_break = false;
                break;
            }
        }
    }
    popident(*id);
    loop_level--;
}
void whilea(char *cond, char *body)
{
    loop_level++;
    while(execute(cond))
    {
        execute(body);
        if(loop_skip) loop_skip = false;
        if(loop_break)
        {
            loop_break = false;
            break;
        }
    }
    loop_level--;
}

void breaka() { if(loop_level) loop_skip = loop_break = true; }
void continuea() { if(loop_level) loop_skip = true; }

void concat(char *s) { result(s); }
void concatword(char *s) { result(s); }

void format(char **args, int numargs)
{
    if(numargs < 1)
    {
        result("");
        return;
    }

    vector<char> s;
    char *f = args[0];
    while(*f)
    {
        int c = *f++;
        if(c == '%')
        {
            int i = *f++;
            if(i >= '1' && i <= '9')
            {
                i -= '0';
                const char *sub = i < numargs ? args[i] : "";
                while(*sub) s.add(*sub++);
            }
            else s.add(i);
        }
        else s.add(c);
    }
    s.add('\0');
    result(s.getbuf());
}

#define whitespaceskip s += strspn(s, "\n\t \r")
#define elementskip *s=='"' ? (++s, s += strcspn(s, "\"\n\0"), s += *s=='"') : s += strcspn(s, "\n\t \0")

void explodelist(const char *s, vector<char *> &elems)
{
    whitespaceskip;
    while(*s)
    {
        const char *elem = s;
        elementskip;
        elems.add(*elem=='"' ? newstring(elem+1, s-elem-(s[-1]=='"' ? 2 : 1)) : newstring(elem, s-elem));
        whitespaceskip;
    }
}

void looplist(char *list, char *var, char *body)
{
    ident *id = newident(var, execcontext);
    if(id->type!=ID_ALIAS) return;
    char *buf = newstring(MAXSTRLEN);

    vector<char *> elems;
    explodelist(list, elems);

    loop_level++;
    loopv(elems)
    {
        const char *elem = elems[i];
        if(buf != id->action)
        {
            if(id->action != id->executing) delete[] id->action;
            id->action = buf = newstring(MAXSTRLEN);
        }
        copystring(id->action, elem);
        execute(body);
        if(loop_skip) loop_skip = false;
        if(loop_break)
        {
            loop_break = false;
            break;   // FIXME (leaking memory)
        }
    }
    popident(*id);
    loop_level--;
}

char *indexlist(const char *s, int pos)
{
    whitespaceskip;
    loopi(pos)
    {
        elementskip;
        whitespaceskip;
        if(!*s) break;
    }
    const char *e = s;
    elementskip;
    if(*e=='"')
    {
        e++;
        if(s[-1]=='"') --s;
    }
    return newstring(e, s-e);
}

int listlen(char *s)
{
    int n = 0;
    whitespaceskip;
    for(; *s; n++) elementskip, whitespaceskip;
    return n;
}

void at(char *s, int *pos)
{
    commandret = indexlist(s, *pos);
}

int find(const char *s, const char *key)
{
    whitespaceskip;
    int len = strlen(key);
    for(int i = 0; *s; i++)
    {
        const char *a = s, *e = s;
        elementskip;
        if(*e=='"')
        {
            e++;
            if(s[-1]=='"') --s;
        }
        if(s-e==len && !strncmp(e, key, s-e)) return i;
        else s = a;
        elementskip, whitespaceskip;
    }
    return -1;
}

void findlist(char *s, char *key)
{
    intret(find(s, key));
}
void colora(char *s)
{
    if(s[0] && s[1]=='\0')
    {
        defformatstring(x)("\f%c",s[0]);
        commandret = newstring(x);
    }
}

// Easily inject a string into various CubeScript punctuations
void addpunct(char *s, int *type)
{
    switch(*type)
    {
        case 1:  defformatstring(o1)("[%s]", s);   result(o1); break;
        case 2:  defformatstring(o2)("(%s)", s);   result(o2); break;
        case 3:  defformatstring(o3)("$%s", s);    result(o3); break;
        case 4:  result("\""); break;
        case 5:  result("%");  break;
        default: defformatstring(o4)("\"%s\"", s); result(o4); break;
    }
}

void toLower(char *s) { result(strcaps(s, false)); }
void toUpper(char *s) { result(strcaps(s, true)); }

void testchar(char *s, int *type)
{
    bool istrue = false;
    switch(*type) {
        case 1:
            if(isalpha(s[0]) != 0) { istrue = true; }
            break;
        case 2:
            if(isalnum(s[0]) != 0) { istrue = true; }
            break;
        case 3:
            if(islower(s[0]) != 0) { istrue = true; }
            break;
        case 4:
            if(isupper(s[0]) != 0) { istrue = true; }
            break;
        case 5:
            if(isprint(s[0]) != 0) { istrue = true; }
            break;
        case 6:
            if(ispunct(s[0]) != 0) { istrue = true; }
            break;
        case 7:
            if(isspace(s[0]) != 0) { istrue = true; }
            break;
        case 8: // Without this it is impossible to determine if a character === " in cubescript
            if(!strcmp(s, "\"")) { istrue = true; }
            break;
        default:
            if(isdigit(s[0]) != 0) { istrue = true; }
            break;
    }
    if(istrue)
        intret(1);
    else
        intret(0);
}

char *strreplace(char *dest, const char *source, const char *search, const char *replace)
{
    vector<char> buf;

    int searchlen = strlen(search);
    if(!searchlen) { copystring(dest, source); return dest; }
    for(;;)
    {
        const char *found = strstr(source, search);
        if(found)
        {
            while(source < found) buf.add(*source++);
            for(const char *n = replace; *n; n++) buf.add(*n);
            source = found + searchlen;
        }
        else
        {
            while(*source) buf.add(*source++);
            buf.add('\0');
            return copystring(dest, buf.getbuf());
        }
    }
}

int stringsort(const char **a, const char **b) { return strcmp(*a, *b); }
int stringsortignorecase(const char **a, const char **b) { return strcasecmp(*a, *b); }

void sortlist(char *list)
{
    char* buf;
    buf = new char [strlen(list)]; strcpy(buf, ""); //output

    if(*list == '\0')
    {
        //no input
        result(buf);
        delete [] buf;
        return;
    }

    vector<char *> elems;
    explodelist(list, elems);    // FIXME (leaking memory)
    elems.sort(stringsort);

    strcpy(buf, elems[0]);
    for(int i = 1; i < elems.length(); i++)
    {
        strcat(buf, " ");
        strcat(buf, elems[i]);
    }

    result(buf); //result
    delete [] buf;
 }

 void swapelements(char *list, char *v)
 {
    char* buf;
    buf = new char [strlen(list)]; strcpy(buf, ""); //output

    if(*list == '\0')
    {
        // no input
         result(buf);
         delete [] buf;
         return;
    }

    vector<char *> elems;
    explodelist(list, elems);

    vector<char *> swap;
    explodelist(v, swap);

    if(*v == '\0' || //no input
       swap.length()%2 != 0) //incorrect input
    {
        result(buf);
        delete [] buf;
        return;  // FIXME (leaking memory)
    }

    char tmp[255]; strcpy (tmp, "");

    for(int i = 0; i < swap.length(); i+=2)
    {
        if (elems.inrange(atoi(swap[i])) && elems.inrange(atoi(swap[i + 1])))
        {
            strcpy(tmp, elems[atoi(swap[i])]);
            strcpy(elems[atoi(swap[i])], elems[atoi(swap[i+1])]);
            strcpy(elems[atoi(swap[i+1])], tmp);
        }
    }

    strcpy(buf, elems[0]);
    for(int i = 1; i < elems.length(); i++)
    {
        strcat(buf, " ");
        strcat(buf, elems[i]);
    }

    result(buf); //result
    delete [] buf;
    // FIXME (leaking memory)
 }

COMMANDN(c, colora, "s");
COMMANDN(loop, loopa, "sis");
COMMAND(looplist, "sss");
COMMANDN(while, whilea, "ss");
COMMANDN(break, breaka, "");
COMMANDN(continue, continuea, "");
COMMANDN(if, ifthen, "sss");
COMMAND(exec, "s");
COMMAND(concat, "c");
COMMAND(concatword, "w");
COMMAND(format, "v");
COMMAND(result, "s");
COMMAND(execute, "s");
COMMAND(at, "si");
COMMANDF(listlen, "s", (char *l) { intret(listlen(l)); });
COMMAND(findlist, "ss");
COMMAND(addpunct, "si");
COMMANDN(tolower, toLower, "s");
COMMANDN(toupper, toUpper, "s");
COMMAND(testchar, "si");
COMMAND(sortlist, "c");
COMMANDF(strreplace, "sss", (const char *source, const char *search, const char *replace) { string d; result(strreplace(d, source, search, replace)); });
COMMAND(swapelements, "ss");

void add(int *a, int *b)   { intret(*a + *b); }            COMMANDN(+, add, "ii");
void mul(int *a, int *b)   { intret(*a * *b); }            COMMANDN(*, mul, "ii");
void sub(int *a, int *b)   { intret(*a - *b); }            COMMANDN(-, sub, "ii");
void div_(int *a, int *b)  { intret(*b ? (*a)/(*b) : 0); }    COMMANDN(div, div_, "ii");
void mod_(int *a, int *b)   { intret(*b ? (*a)%(*b) : 0); }    COMMANDN(mod, mod_, "ii");
void addf(float *a, float *b)   { floatret(*a + *b); }            COMMANDN(+f, addf, "ff");
void mulf(float *a, float *b)   { floatret(*a * *b); }            COMMANDN(*f, mulf, "ff");
void subf(float *a, float *b)   { floatret(*a - *b); }            COMMANDN(-f, subf, "ff");
void divf_(float *a, float *b)  { floatret(*b ? (*a)/(*b) : 0); }    COMMANDN(divf, divf_, "ff");
void modf_(float *a, float *b)   { floatret(*b ? fmod(*a, *b) : 0); }    COMMANDN(modf, modf_, "ff");
void powf_(float *a, float *b)   { floatret(powf(*a, *b)); }    COMMANDN(powf, powf_, "ff");
void not_(int *a) { intret((int)(!(*a))); }              COMMANDN(!, not_, "i");
void equal(int *a, int *b) { intret((int)(*a == *b)); }    COMMANDN(=, equal, "ii");
void notequal(int *a, int *b) { intret((int)(*a != *b)); } COMMANDN(!=, notequal, "ii");
void lt(int *a, int *b)    { intret((int)(*a < *b)); }     COMMANDN(<, lt, "ii");
void gt(int *a, int *b)    { intret((int)(*a > *b)); }     COMMANDN(>, gt, "ii");
void lte(int *a, int *b)    { intret((int)(*a <= *b)); }   COMMANDN(<=, lte, "ii");
void gte(int *a, int *b)    { intret((int)(*a >= *b)); }   COMMANDN(>=, gte, "ii");

COMMANDF(round, "f", (float *a) { intret((int)round(*a)); });
COMMANDF(ceil,  "f", (float *a) { intret((int)ceil(*a)); });
COMMANDF(floor, "f", (float *a) { intret((int)floor(*a)); });

#define COMPAREF(opname, func, op) \
    void func(float *a, float *b) { intret((int)((*a) op (*b))); } \
    COMMANDN(opname, func, "ff")
COMPAREF(=f, equalf, ==);
COMPAREF(!=f, notequalf, !=);
COMPAREF(<f, ltf, <);
COMPAREF(>f, gtf, >);
COMPAREF(<=f, ltef, <=);
COMPAREF(>=f, gtef, >=);

void anda (char *a, char *b) { intret(execute(a)!=0 && execute(b)!=0); }
void ora  (char *a, char *b) { intret(execute(a)!=0 || execute(b)!=0); }

COMMANDN(&&, anda, "ss");
COMMANDN(||, ora, "ss");

COMMANDF(strcmp, "ss", (char *a, char *b) { intret((strcmp(a, b) == 0) ? 1 : 0); });

COMMANDF(rnd, "i", (int *a) { intret(*a>0 ? rnd(*a) : 0); });

#ifndef STANDALONE
void writecfg()
{
    filerotate("config/saved", "cfg", CONFIGROTATEMAX); // keep five old config sets
    stream *f = openfile(path("config/saved.cfg", true), "w");
    if(!f) return;
    f->printf("// automatically written on exit, DO NOT MODIFY\n// delete this file to have defaults.cfg overwrite these settings\n// modify settings in game, or put settings in autoexec.cfg to override anything\n\n");
    f->printf("// basic settings\n\n");
    f->printf("name \"%s\"\n", player1->name);
    extern const char *crosshairnames[CROSSHAIR_NUM];
    extern Texture *crosshairs[CROSSHAIR_NUM];
    loopi(CROSSHAIR_NUM) if(crosshairs[i] && crosshairs[i]!=notexture)
    {
        const char *fname = crosshairs[i]->name+strlen("packages/crosshairs/");
        if(i==CROSSHAIR_DEFAULT) f->printf("loadcrosshair %s\n", fname);
        else f->printf("loadcrosshair %s %s\n", fname, crosshairnames[i]);
    }
    extern int lowfps, highfps;
    f->printf("fpsrange %d %d\n", lowfps, highfps);
    extern string myfont;
    f->printf("setfont %s\n", myfont);
    f->printf("\n");
    audiomgr.writesoundconfig(f);
    f->printf("\n");
    f->printf("// kill messages for each weapon\n");
    loopi(NUMGUNS)
    {
        const char *fragmsg = killmessage(i, false);
        const char *gibmsg = killmessage(i, true);
        f->printf("\nfragmessage %d [%s]", i, fragmsg);
        f->printf("\ngibmessage %d [%s]", i, gibmsg);
    }
    f->printf("\n\n// client variables\n\n");
    enumerate(*idents, ident, id,
        if(!id.persist) continue;
        switch(id.type)
        {
            case ID_VAR: f->printf("%s %d\n", id.name, *id.storage.i); break;
            case ID_FVAR: f->printf("%s %s\n", id.name, floatstr(*id.storage.f)); break;
            case ID_SVAR: f->printf("%s [%s]\n", id.name, *id.storage.s); break;
        }
    );
    f->printf("\n// weapon settings\n\n");
    loopi(NUMGUNS) if(guns[i].isauto)
    {
        f->printf("burstshots %d %d\n", i, burstshotssettings[i]);
    }
    f->printf("\n// key binds\n\n");
    writebinds(f);
    f->printf("\n// aliases\n\n");
    enumerate(*idents, ident, id,
        if(id.type==ID_ALIAS && id.persist && id.action[0] && strncmp(id.name, "demodesc_", 9))
        {
            f->printf("%s = [%s]\n", id.name, id.action);
        }
    );
    f->printf("\n// demo descriptions\n\n");
    enumerate(*idents, ident, id,
        if(id.type==ID_ALIAS && id.persist && id.action[0] && !strncmp(id.name, "demodesc_", 9) && id.action)
        {
            f->printf("%s = [%s]\n", id.name, id.action);
        }
    );
    f->printf("\n");
    delete f;
}

COMMAND(writecfg, "");

void deletecfg()
{
    string configs[] = { "config/saved.cfg", "config/init.cfg" };
    loopj(2) // delete files in homedir and basedir if possible
    {
        loopi(sizeof(configs)/sizeof(configs[0]))
        {
            const char *file = findfile(path(configs[i], true), "r");
            if(!file) continue;
            delfile(file);
        }
    }
}
#endif

void identnames(vector<const char *> &names, bool builtinonly)
{
    enumeratekt(*idents, const char *, name, ident, id,
    {
        if(!builtinonly || id.type != ID_ALIAS) names.add(name);
    });
}

void pushscontext(int newcontext)
{
    contextstack.add(execcontext);
    execcontext = newcontext;
}

int popscontext()
{
    ASSERT(contextstack.length() > 0);
    int old = execcontext;
    execcontext = contextstack.pop();

    if(execcontext < old && old >= IEXC_MAPCFG) // clean up aliases created in the old (map cfg) context
    {
        int limitcontext = max(execcontext + 1, (int) IEXC_MAPCFG);  // don't clean up below IEXC_MAPCFG
        enumeratekt(*idents, const char *, name, ident, id,
        {
            if(id.type == ID_ALIAS && id.context >= limitcontext)
            {
                while(id.stack && id.stack->context >= limitcontext)
                    popident(id);
                if(id.context >= limitcontext)
                {
                    if(id.action != id.executing) delete[] id.action;
                    idents->remove(name);
                }
            }
        });
    }
    return execcontext;
}

void scriptcontext(int *context, char *idname)
{
    if(contextsealed) return;
    ident *id = idents->access(idname);
    if(!id) return;
    int c = *context;
    if(c >= 0 && c < IEXC_NUM) id->context = c;
}

void isolatecontext(int *context)
{
    if(*context >= 0 && *context < IEXC_NUM && !contextsealed) contextisolated[*context] = true;
}

void sealcontexts() { contextsealed = true; }

bool allowidentaccess(ident *id) // check if ident is allowed in current context
{
    ASSERT(execcontext >= 0 && execcontext < IEXC_NUM);
    if(!id) return false;
    if(!contextisolated[execcontext]) return true; // only check if context is isolated
    return execcontext <= id->context;
}

COMMAND(scriptcontext, "is");
COMMAND(isolatecontext, "i");
COMMAND(sealcontexts, "");

#ifndef STANDALONE
COMMANDF(watchingdemo, "", () { intret(watchingdemo); });

void systime()
{
    result(numtime());
}

void timestamp_()
{
    result(timestring(true, "%Y %m %d %H %M %S"));
}

void datestring()
{
    result(timestring(true, "%c"));
}

void timestring_()
{
    const char *res = timestring(true, "%H:%M:%S");
    result(res[0] == '0' ? res + 1 : res);
}

extern int millis_() { extern int totalmillis; return totalmillis; }
void strlen_(char *s) { intret(strlen(s)); }

void substr_(char *fs, int *pa, int *len)
{
    int ia = *pa;
    int ilen = *len;
    int fslen = (int)strlen(fs);
    if(ia<0) ia += fslen;
    if(ia>fslen || ia < 0 || ilen < 0) return;

    if(!ilen) ilen = fslen-ia;
    if(ilen >= 0 && ilen < int(strlen(fs+ia))) (fs+ia)[ilen] = '\0';
    result(fs+ia);
}

void strpos_(char *haystack, char *needle, int *occurence)
{
    int position = -1;
    char *ptr = haystack;

    if(haystack && needle)
    for(int iocc = *occurence; iocc >= 0; iocc--)
    {
        ptr = strstr(ptr, needle);
        if (ptr)
        {
            position = ptr-haystack;
            ptr += strlen(needle);
        }
        else
        {
            position = -1;
            break;
        }
    }
    intret(position);
}

void l0(int *p, int *v) { string f; string r; formatstring(f)("%%0%dd", *p); formatstring(r)(f, *v); result(r); }

void getscrext()
{
    switch(screenshottype)
    {
        case 2: result(".png"); break;
        case 1: result(".jpg"); break;
        case 0:
        default: result(".bmp"); break;
    }
}

COMMANDF(millis, "", () { intret(millis_()); });
COMMANDN(strlen, strlen_, "s");
COMMANDN(substr, substr_, "sii");
COMMANDN(strpos, strpos_, "ssi");
COMMAND(l0, "ii");
COMMAND(systime, "");
COMMANDN(timestamp, timestamp_, "");
COMMAND(datestring, "");
COMMANDN(timestring, timestring_, "");
COMMANDF(getmode, "i", (int *acr) { result(modestr(gamemode, *acr != 0)); });
COMMAND(getscrext, "");

const char *currentserver(int i) // [client version]
{
    static string curSRVinfo;
    // using the curpeer directly we can get the info of our currently connected server
    string r;
    r[0] = '\0';
    extern ENetPeer *curpeer;
    if(curpeer)
    {
        switch(i)
        {
            case 1: // IP
            {
                uchar *ip = (uchar *)&curpeer->address.host;
                formatstring(r)("%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
                break;
            }
            case 2: // HOST
            {
                char hn[1024];
                formatstring(r)("%s", (enet_address_get_host(&curpeer->address, hn, sizeof(hn))==0) ? hn : "unknown");
                break;
            }
            case 3: // PORT
            {
                formatstring(r)("%d", curpeer->address.port);
                break;
            }
            case 4: // STATE
            {
                const char *statenames[] =
                {
                    "disconnected",
                    "connecting",
                    "acknowledging connect",
                    "connection pending",
                    "connection succeeded",
                    "connected",
                    "disconnect later",
                    "disconnecting",
                    "acknowledging disconnect",
                    "zombie"
                };
                if(curpeer->state>=0 && curpeer->state<int(sizeof(statenames)/sizeof(statenames[0])))
                    copystring(r, statenames[curpeer->state]);
                break; // 5 == Connected (compare ../enet/include/enet/enet.h +165)
            }
            // CAUTION: the following are only filled if the serverbrowser was used or the scoreboard shown
            // SERVERNAME
            case 5: { serverinfo *si = getconnectedserverinfo(); if(si) copystring(r, si->name); break; }
            // DESCRIPTION (3)
            case 6: { serverinfo *si = getconnectedserverinfo(); if(si) copystring(r, si->sdesc); break; }
            case 7: { serverinfo *si = getconnectedserverinfo(); if(si) copystring(r, si->description); break; }
            // CAUTION: the following is only the last full-description _seen_ in the serverbrowser!
            case 8: { serverinfo *si = getconnectedserverinfo(); if(si) copystring(r, si->full); break; }
            // just IP & PORT as default response - always available, no lookup-delay either
             default:
            {
                uchar *ip = (uchar *)&curpeer->address.host;
                formatstring(r)("%d.%d.%d.%d %d", ip[0], ip[1], ip[2], ip[3], curpeer->address.port);
                break;
            }
        }
    }
    copystring(curSRVinfo, r);
    return curSRVinfo;
}

COMMANDF(curserver, "i", (int *i) { result(currentserver(*i)); });
#endif

void debugargs(char **args, int numargs)
{
    printf("debugargs: ");
    loopi(numargs)
    {
        if(i) printf(", ");
        printf("\"%s\"", args[i]);
    }
    printf("\n");
}

COMMAND(debugargs, "v");