Convert to ObjC++
FossilOrigin-Name: 7c2704b3d77d6e63d960e315bfb601fddbf6fce538b7c5db6da664e04fbce4c2
This commit is contained in:
parent
04fa50a332
commit
133382170f
34 changed files with 87 additions and 79 deletions
627
src/command.mm
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627
src/command.mm
Normal file
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// command.cpp: implements the parsing and execution of a tiny script language
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// which is largely backwards compatible with the quake console language.
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#include "cube.h"
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enum { ID_VAR, ID_COMMAND, ID_ALIAS };
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struct ident {
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int type; // one of ID_* above
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char *name;
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int min, max; // ID_VAR
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int *storage; // ID_VAR
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void (*fun)(); // ID_VAR, ID_COMMAND
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int narg; // ID_VAR, ID_COMMAND
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char *action; // ID_ALIAS
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bool persist;
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};
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void
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itoa(char *s, int i)
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{
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sprintf_s(s)("%d", i);
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};
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char *
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exchangestr(char *o, char *n)
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{
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gp()->deallocstr(o);
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return newstring(n);
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};
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hashtable<ident> *idents = NULL; // contains ALL vars/commands/aliases
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void
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alias(char *name, char *action)
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{
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ident *b = idents->access(name);
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if (!b) {
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name = newstring(name);
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ident b = {
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ID_ALIAS, name, 0, 0, 0, 0, 0, newstring(action), true};
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idents->access(name, &b);
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} else {
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if (b->type == ID_ALIAS)
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b->action = exchangestr(b->action, action);
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else
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conoutf(
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"cannot redefine builtin %s with an alias", name);
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};
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};
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COMMAND(alias, ARG_2STR);
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// variable's and commands are registered through globals, see cube.h
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int
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variable(char *name, int min, int cur, int max, int *storage, void (*fun)(),
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bool persist)
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{
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if (!idents)
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idents = new hashtable<ident>;
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ident v = {ID_VAR, name, min, max, storage, fun, 0, 0, persist};
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idents->access(name, &v);
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return cur;
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};
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void
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setvar(char *name, int i)
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{
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*idents->access(name)->storage = i;
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};
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int
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getvar(char *name)
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{
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return *idents->access(name)->storage;
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};
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bool
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identexists(char *name)
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{
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return idents->access(name) != NULL;
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};
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char *
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getalias(char *name)
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{
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ident *i = idents->access(name);
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return i && i->type == ID_ALIAS ? i->action : NULL;
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};
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bool
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addcommand(char *name, void (*fun)(), int narg)
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{
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if (!idents)
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idents = new hashtable<ident>;
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ident c = {ID_COMMAND, name, 0, 0, 0, fun, narg, 0, false};
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idents->access(name, &c);
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return false;
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};
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char *
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parseexp(char *&p, int right) // parse any nested set of () or []
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{
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int left = *p++;
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char *word = p;
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for (int brak = 1; brak;) {
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int c = *p++;
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if (c == '\r')
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*(p - 1) = ' '; // hack
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if (c == left)
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brak++;
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else if (c == right)
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brak--;
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else if (!c) {
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p--;
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conoutf("missing \"%c\"", right);
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return NULL;
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};
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};
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char *s = newstring(word, p - word - 1);
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if (left == '(') {
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string t;
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itoa(t,
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execute(
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s)); // evaluate () exps directly, and substitute result
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s = exchangestr(s, t);
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};
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return s;
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};
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char *
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parseword(char *&p) // parse single argument, including expressions
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{
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p += strspn(p, " \t\r");
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if (p[0] == '/' && p[1] == '/')
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p += strcspn(p, "\n\0");
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if (*p == '\"') {
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p++;
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char *word = p;
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p += strcspn(p, "\"\r\n\0");
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char *s = newstring(word, p - word);
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if (*p == '\"')
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p++;
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return s;
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};
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if (*p == '(')
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return parseexp(p, ')');
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if (*p == '[')
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return parseexp(p, ']');
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char *word = p;
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p += strcspn(p, "; \t\r\n\0");
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if (p - word == 0)
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return NULL;
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return newstring(word, p - word);
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};
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char *
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lookup(char *n) // find value of ident referenced with $ in exp
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{
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ident *ID = idents->access(n + 1);
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if (ID)
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switch (ID->type) {
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case ID_VAR:
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string t;
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itoa(t, *(ID->storage));
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return exchangestr(n, t);
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case ID_ALIAS:
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return exchangestr(n, ID->action);
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};
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conoutf("unknown alias lookup: %s", n + 1);
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return n;
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};
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int
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execute(char *p, bool isdown) // all evaluation happens here, recursively
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{
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const int MAXWORDS = 25; // limit, remove
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char *w[MAXWORDS];
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int val = 0;
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for (bool cont = true; cont;) // for each ; seperated statement
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{
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int numargs = MAXWORDS;
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loopi(MAXWORDS) // collect all argument values
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{
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w[i] = "";
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if (i > numargs)
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continue;
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char *s = parseword(p); // parse and evaluate exps
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if (!s) {
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numargs = i;
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s = "";
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};
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if (*s == '$')
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s = lookup(s); // substitute variables
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w[i] = s;
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};
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p += strcspn(p, ";\n\0");
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cont = *p++ !=
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0; // more statements if this isn't the end of the string
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char *c = w[0];
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if (*c == '/')
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c++; // strip irc-style command prefix
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if (!*c)
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continue; // empty statement
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ident *ID = idents->access(c);
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if (!ID) {
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val = ATOI(c);
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if (!val && *c != '0')
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conoutf("unknown command: %s", c);
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} else
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switch (ID->type) {
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case ID_COMMAND: // game defined commands
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switch (ID->narg) // use very ad-hoc function
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// signature, and just call it
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{
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case ARG_1INT:
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if (isdown)
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((void(__cdecl *)(int))ID->fun)(
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ATOI(w[1]));
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break;
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case ARG_2INT:
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if (isdown)
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((void(__cdecl *)(
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int, int))ID->fun)(
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ATOI(w[1]), ATOI(w[2]));
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break;
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case ARG_3INT:
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if (isdown)
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((void(__cdecl *)(int, int,
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int))ID->fun)(ATOI(w[1]),
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ATOI(w[2]), ATOI(w[3]));
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break;
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case ARG_4INT:
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if (isdown)
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((void(__cdecl *)(int, int, int,
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int))ID->fun)(ATOI(w[1]),
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ATOI(w[2]), ATOI(w[3]),
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ATOI(w[4]));
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break;
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case ARG_NONE:
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if (isdown)
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((void(__cdecl *)())ID->fun)();
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break;
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case ARG_1STR:
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if (isdown)
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((void(__cdecl *)(
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char *))ID->fun)(w[1]);
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break;
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case ARG_2STR:
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if (isdown)
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((void(__cdecl *)(
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char *, char *))ID->fun)(
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w[1], w[2]);
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break;
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case ARG_3STR:
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if (isdown)
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((void(__cdecl *)(char *,
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char *, char *))ID->fun)(
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w[1], w[2], w[3]);
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break;
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case ARG_5STR:
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if (isdown)
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((void(__cdecl *)(char *,
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char *, char *, char *,
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char *))ID->fun)(w[1], w[2],
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w[3], w[4], w[5]);
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break;
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case ARG_DOWN:
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((void(__cdecl *)(bool))ID->fun)(
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isdown);
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break;
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case ARG_DWN1:
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((void(__cdecl *)(bool,
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char *))ID->fun)(isdown, w[1]);
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break;
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case ARG_1EXP:
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if (isdown)
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val = ((int(__cdecl *)(
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int))ID->fun)(
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execute(w[1]));
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break;
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case ARG_2EXP:
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if (isdown)
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val = ((int(__cdecl *)(int,
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int))ID->fun)(execute(w[1]),
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execute(w[2]));
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break;
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case ARG_1EST:
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if (isdown)
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val = ((int(__cdecl *)(
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char *))ID->fun)(w[1]);
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break;
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case ARG_2EST:
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if (isdown)
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val = ((int(__cdecl *)(
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char *, char *))ID->fun)(
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w[1], w[2]);
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break;
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case ARG_VARI:
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if (isdown) {
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string r; // limit, remove
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r[0] = 0;
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for (int i = 1; i < numargs;
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i++) {
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strcat_s(r,
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w[i]); // make
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// string-list
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// out of all
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// arguments
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if (i == numargs - 1)
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break;
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strcat_s(r, " ");
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};
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((void(__cdecl *)(
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char *))ID->fun)(r);
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break;
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}
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};
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break;
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case ID_VAR: // game defined variabled
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if (isdown) {
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if (!w[1][0])
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conoutf("%s = %d", c,
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*ID->storage); // var with
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// no value
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// just
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// prints its
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// current
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// value
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else {
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if (ID->min > ID->max) {
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conoutf("variable is "
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"read-only");
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} else {
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int i1 = ATOI(w[1]);
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if (i1 < ID->min ||
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i1 > ID->max) {
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i1 =
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i1 < ID->min
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? ID->min
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: ID->max; // clamp to valid range
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conoutf(
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"valid "
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"range for "
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"%s is "
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"%d..%d",
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c, ID->min,
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ID->max);
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}
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*ID->storage = i1;
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};
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if (ID->fun)
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((void(__cdecl *)())ID
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->fun)(); // call
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// trigger
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// function
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// if
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// available
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};
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};
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break;
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case ID_ALIAS: // alias, also used as functions and
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// (global) variables
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for (int i = 1; i < numargs; i++) {
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sprintf_sd(t)("arg%d",
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i); // set any arguments as (global)
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// arg values so functions can
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// access them
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alias(t, w[i]);
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};
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char *action = newstring(
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ID->action); // create new string here
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// because alias could rebind
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// itself
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val = execute(action, isdown);
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gp()->deallocstr(action);
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break;
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};
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loopj(numargs) gp()->deallocstr(w[j]);
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};
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return val;
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};
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// tab-completion of all idents
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int completesize = 0, completeidx = 0;
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void
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resetcomplete()
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{
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completesize = 0;
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};
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void
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complete(char *s)
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{
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if (*s != '/') {
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string t;
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strcpy_s(t, s);
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strcpy_s(s, "/");
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strcat_s(s, t);
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};
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if (!s[1])
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return;
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if (!completesize) {
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completesize = (int)strlen(s) - 1;
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completeidx = 0;
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};
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int idx = 0;
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enumerate(
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idents, ident *, id,
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if (strncmp(id->name, s + 1, completesize) == 0 &&
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idx++ == completeidx) {
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strcpy_s(s, "/");
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strcat_s(s, id->name);
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};);
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completeidx++;
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if (completeidx >= idx)
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completeidx = 0;
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};
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bool
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execfile(char *cfgfile)
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{
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string s;
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strcpy_s(s, cfgfile);
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char *buf = loadfile(path(s), NULL);
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if (!buf)
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return false;
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execute(buf);
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free(buf);
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return true;
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};
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void
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exec(char *cfgfile)
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{
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if (!execfile(cfgfile))
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conoutf("could not read \"%s\"", cfgfile);
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};
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void
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writecfg()
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{
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FILE *f = fopen("config.cfg", "w");
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if (!f)
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return;
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fprintf(f, "// automatically written on exit, do not modify\n// delete "
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"this file to have defaults.cfg overwrite these "
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"settings\n// modify settings in game, or put settings in "
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"autoexec.cfg to override anything\n\n");
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writeclientinfo(f);
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fprintf(f, "\n");
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enumerate(
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idents, ident *, ID, if (ID->type == ID_VAR && ID->persist) {
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fprintf(f, "%s %d\n", ID->name, *ID->storage);
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};);
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fprintf(f, "\n");
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writebinds(f);
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fprintf(f, "\n");
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enumerate(
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idents, ident *, ID,
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if (ID->type == ID_ALIAS && !strstr(ID->name, "nextmap_")) {
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fprintf(f, "alias \"%s\" [%s]\n", ID->name, ID->action);
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};);
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fclose(f);
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};
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COMMAND(writecfg, ARG_NONE);
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// below the commands that implement a small imperative language. thanks to the
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// semantics of
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// () and [] expressions, any control construct can be defined trivially.
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void
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intset(char *name, int v)
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{
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string b;
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itoa(b, v);
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alias(name, b);
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};
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void
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ifthen(char *cond, char *thenp, char *elsep)
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{
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execute(cond[0] != '0' ? thenp : elsep);
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};
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void
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loopa(char *times, char *body)
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{
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int t = atoi(times);
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loopi(t)
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{
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intset("i", i);
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execute(body);
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};
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};
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void
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whilea(char *cond, char *body)
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{
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while (execute(cond))
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execute(body);
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}; // can't get any simpler than this :)
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void
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onrelease(bool on, char *body)
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{
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if (!on)
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execute(body);
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};
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void
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concat(char *s)
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{
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alias("s", s);
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};
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void
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concatword(char *s)
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{
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for (char *a = s, *b = s; *a = *b; b++)
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if (*a != ' ')
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a++;
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concat(s);
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};
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int
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listlen(char *a)
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{
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if (!*a)
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return 0;
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int n = 0;
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while (*a)
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if (*a++ == ' ')
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n++;
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||||
return n + 1;
|
||||
};
|
||||
|
||||
void
|
||||
at(char *s, char *pos)
|
||||
{
|
||||
int n = atoi(pos);
|
||||
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);
|
||||
Loading…
Add table
Add a link
Reference in a new issue