static void prefixexp (LexState *ls, expdesc *v) {
/* prefixexp -> NAME | '(' expr ')' */
switch (ls->t.token) {
case '(': {
int line = ls->linenumber;
next(ls);
expr(ls, v);
check_match(ls, ')', '(', line);
luaK_dischargevars(ls->fs, v);
return;
}
case TK_NAME: {
singlevar(ls, v, 1);
return;
}
#ifdef LUA_COMPATUPSYNTAX
case '%': { /* for compatibility only */
TString *varname;
int line = ls->linenumber;
next(ls); /* skip `%' */
varname = singlevar(ls, v, 1);
if (v->k != VUPVAL)
luaX_errorline(ls, "global upvalues are obsolete",
getstr(varname), line);
return;
}
#endif
default: {
luaX_syntaxerror(ls, "unexpected symbol");
return;
}
}
}
static void luaX_error (LexState *ls, const char *s, const char *token) {
luaX_errorline(ls, s, token, ls->linenumber);
}