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// 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>
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identifiers[name] = command;
return false;
}
// parse any nested set of () or []
char *
parseexp(char *&p, int right)
static char *
parseexp(char **p, int right)
{
int left = *p++;
char *word = p;
int left = *(*p)++;
char *word = *p;
for (int brak = 1; brak;) {
int c = *p++;
int c = *(*p)++;
if (c == '\r')
*(p - 1) = ' '; // hack
*(*p - 1) = ' '; // hack
if (c == left)
brak++;
else if (c == right)
brak--;
else if (!c) {
p--;
(*p)--;
conoutf(@"missing \"%c\"", right);
return NULL;
}
}
char *s = strndup(word, p - word - 1);
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
char *
parseword(char *&p)
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++;
(*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 == '(')
if (**p == '(')
return parseexp(p, ')');
if (*p == '[')
if (**p == '[')
return parseexp(p, ']');
char *word = p;
p += strcspn(p, "; \t\r\n\0");
if (p - word == 0)
char *word = *p;
*p += strcspn(*p, "; \t\r\n\0");
if (*p - word == 0)
return NULL;
return strndup(word, p - word);
return strndup(word, *p - word);
}
// find value of ident referenced with $ in exp
OFString *
lookup(OFString *n)
{
__kindof Identifier *identifier = identifiers[[n substringFromIndex:1]];
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return 0;
}
// all evaluation happens here, recursively
int
execute(OFString *string, bool isDown)
{
char *copy __attribute__((__cleanup__(cleanup))) =
std::unique_ptr<char> copy(strdup(string.UTF8String));
char *p = copy.get();
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;
loopi(MAXWORDS)
{
// collect all argument values
w[i] = @"";
if (i > numargs)
continue;
// parse and evaluate exps
char *s = parseword(p);
char *s = parseword(&p);
if (!s) {
numargs = i;
s = strdup("");
}
@try {
if (*s == '$')
// substitute variables
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return n + 1;
}
void
at(OFString *s_, OFString *pos)
{
int n = pos.cube_intValue;
char *copy __attribute__((__cleanup__(cleanup))) =
std::unique_ptr<char> copy(strdup(s_.UTF8String));
char *s = copy.get();
loopi(n) s += strspn(s += strcspn(s, " \0"), " ");
strdup(s_.UTF8String);
char *s = copy;
loopi(n)
{
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)
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