// 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"
#include <memory>
#import "Alias.h"
#import "Command.h"
#import "Identifier.h"
#import "Variable.h"
void
itoa(char *s, int i)
{
sprintf_s(s)("%d", i);
}
char *
exchangestr(char *o, const char *n)
{
gp()->deallocstr(o);
return newstring(n);
}
// contains ALL vars/commands/aliases
static OFMutableDictionary<OFString *, __kindof Identifier *> *identifiers;
void
alias(OFString *name, OFString *action)
{
Alias *alias = identifiers[name];
if (alias == nil) {
alias = [[Alias alloc] initWithName:name
action:action
persisted:true];
if (identifiers == nil)
identifiers = [[OFMutableDictionary alloc] init];
identifiers[name] = alias;
} else {
if ([alias isKindOfClass:[Alias class]])
alias.action = action;
else
conoutf(
@"cannot redefine builtin %@ with an alias", name);
}
}
COMMAND(alias, ARG_2STR)
int
variable(OFString *name, int min, int cur, int max, int *storage,
void (*function)(), bool persisted)
{
Variable *variable = [[Variable alloc] initWithName:name
min:min
max:max
storage:storage
function:function
persisted:persisted];
if (identifiers == nil)
identifiers = [[OFMutableDictionary alloc] init];
identifiers[name] = variable;
return cur;
}
void
setvar(OFString *name, int i)
{
*[identifiers[name] storage] = i;
}
int
getvar(OFString *name)
{
return *[identifiers[name] storage];
}
bool
identexists(OFString *name)
{
return (identifiers[name] != nil);
}
OFString *
getalias(OFString *name)
{
Alias *alias = identifiers[name];
if ([alias isKindOfClass:[Alias class]])
return alias.action;
return nil;
}
bool
addcommand(OFString *name, void (*function)(), int argumentsTypes)
{
Command *command = [[Command alloc] initWithName:name
function:function
argumentsTypes:argumentsTypes];
if (identifiers == nil)
identifiers = [[OFMutableDictionary alloc] init];
identifiers[name] = command;
return false;
}
char *
parseexp(char *&p, int right) // parse any nested set of () or []
{
int left = *p++;
char *word = p;
for (int brak = 1; brak;) {
int c = *p++;
if (c == '\r')
*(p - 1) = ' '; // hack
if (c == left)
brak++;
else if (c == right)
brak--;
else if (!c) {
p--;
conoutf(@"missing \"%c\"", right);
return NULL;
}
}
char *s = newstring(word, p - word - 1);
if (left == '(') {
string t;
itoa(t,
execute(
s)); // evaluate () exps directly, and substitute result
s = exchangestr(s, t);
}
return s;
}
char *
parseword(char *&p) // parse single argument, including expressions
{
p += strspn(p, " \t\r");
if (p[0] == '/' && p[1] == '/')
p += strcspn(p, "\n\0");
if (*p == '\"') {
p++;
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, ']');
char *word = p;
p += strcspn(p, "; \t\r\n\0");
if (p - word == 0)
return NULL;
return newstring(word, p - word);
}
char *
lookup(char *n) // find value of ident referenced with $ in exp
{
@autoreleasepool {
__kindof Identifier *identifier = identifiers[@(n + 1)];
if ([identifier isKindOfClass:[Variable class]]) {
string t;
itoa(t, *[identifier storage]);
return exchangestr(n, t);
} else if ([identifier isKindOfClass:[Alias class]])
return exchangestr(n, [identifier action].UTF8String);
}
conoutf(@"unknown alias lookup: %s", n + 1);
return n;
}
int
execute(char *p, bool isdown) // all evaluation happens here, recursively
{
const int MAXWORDS = 25; // limit, remove
char *w[MAXWORDS];
int val = 0;
for (bool cont = true; cont;) // for each ; seperated statement
{
int numargs = MAXWORDS;
loopi(MAXWORDS) // collect all argument values
{
w[i] = "";
if (i > numargs)
continue;
char *s = parseword(p); // parse and evaluate exps
if (!s) {
numargs = i;
s = "";
}
if (*s == '$')
s = lookup(s); // substitute variables
w[i] = s;
}
p += strcspn(p, ";\n\0");
cont = *p++ !=
0; // more statements if this isn't the end of the string
char *c = w[0];
if (*c == '/')
c++; // strip irc-style command prefix
if (!*c)
continue; // empty statement
@autoreleasepool {
__kindof Identifier *identifier = identifiers[@(c)];
if (identifier == nil) {
val = ATOI(c);
if (!val && *c != '0')
conoutf(@"unknown command: %s", c);
} else {
if ([identifier
isKindOfClass:[Command class]]) {
// game defined commands
// use very ad-hoc function signature,
// and just call it
val = [identifier
callWithArguments:w
numArguments:numargs
isDown:isdown];
} else if ([identifier
isKindOfClass:[Variable
class]]) {
// game defined variables
if (isdown) {
if (!w[1][0])
[identifier printValue];
else
[identifier
setValue:ATOI(
w[1])];
}
} else if ([identifier
isKindOfClass:[Alias class]]) {
// alias, also used as functions and
// (global) variables
for (int i = 1; i < numargs; i++) {
@autoreleasepool {
// set any arguments as
// (global) arg values
// so functions can
// access them
OFString *t = [OFString
stringWithFormat:
@"arg%d", i];
alias(t, @(w[i]));
}
}
// create new string here because alias
// could rebind itself
char *action = newstring(
[identifier action].UTF8String);
val = execute(action, isdown);
gp()->deallocstr(action);
break;
}
}
}
loopj(numargs) gp()->deallocstr(w[j]);
}
return val;
}
// tab-completion of all identifiers
int completesize = 0, completeidx = 0;
void
resetcomplete()
{
completesize = 0;
}
void
complete(OFString *s_)
{
@autoreleasepool {
std::unique_ptr<char> copy(strdup(s_.UTF8String));
char *s = copy.get();
if (*s != '/') {
string t;
strcpy_s(t, s);
strcpy_s(s, "/");
strcat_s(s, t);
}
if (!s[1])
return;
if (!completesize) {
completesize = strlen(s) - 1;
completeidx = 0;
}
__block int idx = 0;
[identifiers enumerateKeysAndObjectsUsingBlock:^(
OFString *name, Identifier *identifier, bool *stop) {
if (strncmp(identifier.name.UTF8String, s + 1,
completesize) == 0 &&
idx++ == completeidx) {
strcpy_s(s, "/");
strcat_s(s, identifier.name.UTF8String);
}
}];
completeidx++;
if (completeidx >= idx)
completeidx = 0;
}
}
bool
execfile(OFString *cfgfile)
{
@autoreleasepool {
OFMutableData *data;
@try {
data = [OFMutableData dataWithContentsOfFile:cfgfile];
} @catch (id e) {
return false;
}
// Ensure \0 termination.
[data addItem:""];
execute((char *)data.mutableItems);
return true;
}
}
void
exec(OFString *cfgfile)
{
if (!execfile(cfgfile)) {
@autoreleasepool {
conoutf(@"could not read \"%@\"", cfgfile);
}
}
}
void
writecfg()
{
OFStream *stream;
@try {
OFIRI *IRI = [Cube.sharedInstance.userDataIRI
IRIByAppendingPathComponent:@"config.cfg"];
stream = [[OFIRIHandler handlerForIRI:IRI] openItemAtIRI:IRI
mode:@"w"];
} @catch (id e) {
return;
}
[stream writeString:
@"// 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"];
writeclientinfo(stream);
[stream writeString:@"\n"];
[identifiers enumerateKeysAndObjectsUsingBlock:^(
OFString *name, __kindof Identifier *identifier, bool *stop) {
if (![identifier isKindOfClass:[Variable class]] ||
![identifier persisted])
return;
[stream writeFormat:@"%@ %d\n", identifier.name,
*[identifier storage]];
}];
[stream writeString:@"\n"];
writebinds(stream);
[stream writeString:@"\n"];
[identifiers enumerateKeysAndObjectsUsingBlock:^(
OFString *name, __kindof Identifier *identifier, bool *stop) {
if (![identifier isKindOfClass:[Alias class]] ||
[identifier.name hasPrefix:@"nextmap_"])
return;
[stream writeFormat:@"alias \"%@\" [%@]\n", identifier.name,
[identifier action]];
}];
[stream close];
}
COMMAND(writecfg, ARG_NONE)
// below the commands that implement a small imperative language. thanks to the
// semantics of
// () and [] expressions, any control construct can be defined trivially.
void
intset(OFString *name, int v)
{
@autoreleasepool {
alias(name, [OFString stringWithFormat:@"%d", v]);
}
}
void
ifthen(OFString *cond, OFString *thenp, OFString *elsep)
{
@autoreleasepool {
std::unique_ptr<char> cmd(strdup(
(cond.UTF8String[0] != '0' ? thenp : elsep).UTF8String));
execute(cmd.get());
}
}
void
loopa(OFString *times, OFString *body_)
{
@autoreleasepool {
int t = (int)times.longLongValue;
std::unique_ptr<char> body(strdup(body_.UTF8String));
loopi(t)
{
intset(@"i", i);
execute(body.get());
}
}
}
void
whilea(OFString *cond_, OFString *body_)
{
@autoreleasepool {
std::unique_ptr<char> cond(strdup(cond_.UTF8String));
std::unique_ptr<char> body(strdup(body_.UTF8String));
while (execute(cond.get()))
execute(body.get());
}
}
void
onrelease(bool on, char *body)
{
if (!on)
execute(body);
}
void
concat(char *s)
{
@autoreleasepool {
alias(@"s", @(s));
}
}
void
concatword(char *s)
{
for (char *a = s, *b = s; *a = *b; b++)
if (*a != ' ')
a++;
concat(s);
}
int
listlen(char *a)
{
if (!*a)
return 0;
int n = 0;
while (*a)
if (*a++ == ' ')
n++;
return n + 1;
}
void
at(OFString *s_, OFString *pos)
{
@autoreleasepool {
int n = (int)pos.longLongValue;
std::unique_ptr<char> copy(strdup(s_.UTF8String));
char *s = copy.get();
loopi(n) s += strspn(s += strcspn(s, " \0"), " ");
s[strcspn(s, " \0")] = 0;
concat(s);
}
}
COMMANDN(loop, loopa, ARG_2STR)
COMMANDN(while, whilea, ARG_2STR)
COMMANDN(if, ifthen, ARG_3STR)
COMMAND(onrelease, ARG_DWN1)
COMMAND(exec, ARG_1STR)
COMMAND(concat, ARG_VARI)
COMMAND(concatword, ARG_VARI)
COMMAND(at, ARG_2STR)
COMMAND(listlen, ARG_1EST)
int
add(int a, int b)
{
return a + b;
}
COMMANDN(+, add, ARG_2EXP)
int
mul(int a, int b)
{
return a * b;
}
COMMANDN(*, mul, ARG_2EXP)
int
sub(int a, int b)
{
return a - b;
}
COMMANDN(-, sub, ARG_2EXP)
int
divi(int a, int b)
{
return b ? a / b : 0;
}
COMMANDN(div, divi, ARG_2EXP)
int
mod(int a, int b)
{
return b ? a % b : 0;
}
COMMAND(mod, ARG_2EXP)
int
equal(int a, int b)
{
return (int)(a == b);
}
COMMANDN(=, equal, ARG_2EXP)
int
lt(int a, int b)
{
return (int)(a < b);
}
COMMANDN(<, lt, ARG_2EXP)
int
gt(int a, int b)
{
return (int)(a > b);
}
COMMANDN(>, gt, ARG_2EXP)
int
strcmpa(char *a, char *b)
{
return strcmp(a, b) == 0;
}
COMMANDN(strcmp, strcmpa, ARG_2EST)
int
rndn(int a)
{
return a > 0 ? rnd(a) : 0;
}
COMMANDN(rnd, rndn, ARG_1EXP)
int
explastmillis()
{
return lastmillis;
}
COMMANDN(millis, explastmillis, ARG_1EXP)