// 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"
#import "Alias.h"
#import "Command.h"
#import "Identifier.h"
#import "OFString+Cube.h"
#import "Variable.h"
// contains ALL vars/commands/aliases
static OFMutableDictionary<OFString *, __kindof Identifier *> *identifiers;
static void
cleanup(char **string)
{
free(*string);
}
void
alias(OFString *name, OFString *action)
{
Alias *alias = identifiers[name];
if (alias == nil) {
alias = [Alias aliasWithName: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 variableWithName: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 commandWithName:name
function:function
argumentsTypes:argumentsTypes];
if (identifiers == nil)
identifiers = [[OFMutableDictionary alloc] init];
identifiers[name] = command;
return false;
}
// parse any nested set of () or []
static char *
parseexp(char **p, int right)
{
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 = strndup(word, *p - word - 1);
if (left == '(') {
OFString *t;
@try {
t = [OFString
stringWithFormat:@"%d", execute(@(s), true)];
} @finally {
free(s);
}
s = strdup(t.UTF8String);
}
return s;
}
// parse single argument, including expressions
static char *
parseword(char **p)
{
(*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 = strndup(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 strndup(word, *p - word);
}
// find value of ident referenced with $ in exp
OFString *
lookup(OFString *n)
{
__kindof Identifier *identifier = identifiers[[n substringFromIndex:1]];
if ([identifier isKindOfClass:Variable.class]) {
return [OFString stringWithFormat:@"%d", *[identifier storage]];
} else if ([identifier isKindOfClass:Alias.class])
return [identifier action];
conoutf(@"unknown alias lookup: %@", [n substringFromIndex:1]);
return n;
}
int
executeIdentifier(__kindof Identifier *identifier,
OFArray<OFString *> *arguments, bool isDown)
{
if (identifier == nil) {
@try {
return [arguments[0] intValueWithBase:0];
} @catch (OFInvalidFormatException *e) {
conoutf(@"unknown command: %@", arguments[0]);
return 0;
} @catch (OFOutOfRangeException *e) {
conoutf(@"invalid value: %@", arguments[0]);
return 0;
}
}
if ([identifier isKindOfClass:Command.class])
// game defined commands use very ad-hoc function signature,
// and just call it
return [identifier callWithArguments:arguments isDown:isDown];
if ([identifier isKindOfClass:Variable.class]) {
if (!isDown)
return 0;
// game defined variables
if (arguments.count < 2 || arguments[1].length == 0)
[identifier printValue];
else
[identifier
setValue:[arguments[1] cube_intValueWithBase:0]];
}
if ([identifier isKindOfClass:Alias.class]) {
// alias, also used as functions and (global) variables
for (int i = 1; i < arguments.count; i++) {
// set any arguments as (global) arg values so
// functions can access them
OFString *t = [OFString stringWithFormat:@"arg%d", i];
alias(t, arguments[i]);
}
return execute([identifier action], isDown);
}
return 0;
}
// all evaluation happens here, recursively
int
execute(OFString *string, bool isDown)
{
char *copy __attribute__((__cleanup__(cleanup))) =
strdup(string.UTF8String);
char *p = copy;
const int MAXWORDS = 25; // limit, remove
OFString *w[MAXWORDS];
int val = 0;
for (bool cont = true; cont;) {
// for each ; seperated statement
int numargs = MAXWORDS;
for (int i = 0; i < MAXWORDS; i++) {
// collect all argument values
w[i] = @"";
if (i > numargs)
continue;
// parse and evaluate exps
char *s = parseword(&p);
if (!s) {
numargs = i;
s = strdup("");
}
@try {
if (*s == '$')
// substitute variables
w[i] = lookup(@(s));
else
w[i] = @(s);
} @finally {
free(s);
}
}
p += strcspn(p, ";\n\0");
// more statements if this isn't the end of the string
cont = *p++ != 0;
OFString *c = w[0];
// strip irc-style command prefix
if ([c hasPrefix:@"/"]) {
c = [c substringFromIndex:1];
w[0] = c;
}
// empty statement
if (c.length == 0)
continue;
val = executeIdentifier(identifiers[c],
[OFArray arrayWithObjects:w count:numargs], isDown);
}
return val;
}
// tab-completion of all identifiers
int completesize = 0, completeidx = 0;
void
resetcomplete()
{
completesize = 0;
}
void
complete(OFMutableString *s)
{
if (![s hasPrefix:@"/"])
[s insertString:@"/" atIndex:0];
if (s.length == 1)
return;
if (!completesize) {
completesize = s.length - 1;
completeidx = 0;
}
__block int idx = 0;
[identifiers enumerateKeysAndObjectsUsingBlock:^(
OFString *name, Identifier *identifier, bool *stop) {
if (strncmp(identifier.name.UTF8String, s.UTF8String + 1,
completesize) == 0 &&
idx++ == completeidx)
[s replaceCharactersInRange:OFMakeRange(1, s.length - 1)
withString:identifier.name];
}];
completeidx++;
if (completeidx >= idx)
completeidx = 0;
}
bool
execfile(OFIRI *cfgfile)
{
OFString *command;
@try {
command = [OFString stringWithContentsOfIRI:cfgfile];
} @catch (OFOpenItemFailedException *e) {
return false;
} @catch (OFReadFailedException *e) {
return false;
}
execute(command, true);
return true;
}
void
exec(OFString *cfgfile)
{
if (!execfile([Cube.sharedInstance.userDataIRI
IRIByAppendingPathComponent:cfgfile]) &&
!execfile([Cube.sharedInstance.gameDataIRI
IRIByAppendingPathComponent:cfgfile]))
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)
{
alias(name, [OFString stringWithFormat:@"%d", v]);
}
void
ifthen(OFString *cond, OFString *thenp, OFString *elsep)
{
execute((![cond hasPrefix:@"0"] ? thenp : elsep), true);
}
void
loopa(OFString *times, OFString *body)
{
int t = times.cube_intValue;
for (int i = 0; i < t; i++) {
intset(@"i", i);
execute(body, true);
}
}
void
whilea(OFString *cond, OFString *body)
{
while (execute(cond, true))
execute(body, true);
}
void
onrelease(bool on, OFString *body)
{
if (!on)
execute(body, true);
}
void
concat(OFString *s)
{
alias(@"s", s);
}
void
concatword(OFString *s)
{
concat([s stringByReplacingOccurrencesOfString:@" " withString:@""]);
}
int
listlen(OFString *a_)
{
const char *a = a_.UTF8String;
if (!*a)
return 0;
int n = 0;
while (*a)
if (*a++ == ' ')
n++;
return n + 1;
}
void
at(OFString *s_, OFString *pos)
{
int n = pos.cube_intValue;
char *copy __attribute__((__cleanup__(cleanup))) =
strdup(s_.UTF8String);
char *s = copy;
for (int i = 0; i < n; i++) {
s += strcspn(s, " \0");
s += strspn(s, " ");
}
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(OFString *a, OFString *b)
{
return [a isEqual:b];
}
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)