// Get a statement
numvar getstatement(void) {
numvar retval = 0;
#if !defined(TINY_BUILD) && !defined(UNIX_BUILD)
chkbreak();
#endif
if (sym == s_while) {
// at this point sym is pointing at s_while, before the conditional expression
// save fetchptr so we can restart parsing from here as the while iterates
parsepoint fetchmark;
markparsepoint(&fetchmark);
for (;;) {
returntoparsepoint(&fetchmark, 0);
getsym(); // fetch the start of the conditional
if (getnum()) {
retval = getstatement();
if (sym == s_returning) break; // exit if we caught a return
}
else {
skipstatement();
break;
}
}
}
else if (sym == s_if) {
getsym(); // eat "if"
if (getnum()) {
retval = getstatement();
if (sym == s_else) {
getsym(); // eat "else"
skipstatement();
}
} else {
skipstatement();
if (sym == s_else) {
getsym(); // eat "else"
retval = getstatement();
}
}
}
else if (sym == s_lcurly) {
getsym(); // eat "{"
while ((sym != s_eof) && (sym != s_returning) && (sym != s_rcurly)) retval = getstatement();
if (sym == s_rcurly) getsym(); // eat "}"
}
else if (sym == s_return) {
getsym(); // eat "return"
if ((sym != s_eof) && (sym != s_semi)) retval = getnum();
sym = s_returning; // signal we're returning up the line
}
#if !defined(TINY_BUILD)
else if (sym == s_switch) retval = getswitchstatement();
#endif
else if (sym == s_function) cmd_function();
else if (sym == s_run) { // run macroname
getsym();
if ((sym != s_script_eeprom) && (sym != s_script_progmem) &&
(sym != s_script_file)) unexpected(M_id);
// address of macroid is in symval via parseid
// check for [,snoozeintervalms]
getsym(); // eat macroid to check for comma; symval untouched
if (sym == s_comma) {
vpush(symval);
getsym(); // eat the comma
getnum(); // get a number or else
startTask(vpop(), expval);
}
else startTask(symval, 0);
}
else if (sym == s_stop) {
getsym();
#if !defined(TINY_BUILD)
if (sym == s_mul) { // stop * stops all tasks
initTaskList();
getsym();
}
else if ((sym == s_semi) || (sym == s_eof)) {
if (background) stopTask(curtask); // stop with no args stops the current task IF we're in back
else initTaskList(); // in foreground, stop all
}
else
#endif
stopTask(getnum());
}
else if (sym == s_rm) { // rm "sym" or rm *
getsym();
if (sym == s_script_eeprom) {
eraseentry(idbuf);
}
#if !defined(TINY_BUILD)
else if (sym == s_mul) nukeeeprom();
#endif
else if (sym != s_undef) expected(M_id);
getsym();
}
else if (sym == s_ls) { getsym(); cmd_ls(); }
#if !defined(TINY_BUILD)
else if (sym == s_boot) cmd_boot();
else if (sym == s_ps) { getsym(); showTaskList(); }
else if (sym == s_peep) { getsym(); cmd_peep(); }
else if (sym == s_help) { getsym(); cmd_help(); }
#endif
else if (sym == s_print) { getsym(); cmd_print(); }
else if (sym == s_semi) { ; } // ;)
#ifdef HEX_UPLOAD
// a line beginning with a colon is treated as a hex record
// containing data to upload to eeprom
//
// TODO: verify checksum
//
else if (sym == s_colon) {
// fetchptr points at the byte count
byte byteCount = gethex(2); // 2 bytes byte count
int addr = gethex(4); // 4 bytes address
byte recordType = gethex(2); // 2 bytes record type; now fetchptr -> data
if (recordType == 1) reboot(); // reboot on EOF record (01)
if (recordType != 0) return; // we only handle the data record (00)
if (addr == 0) nukeeeprom(); // auto-clear eeprom on write to 0000
while (byteCount--) eewrite(addr++, gethex(2)); // update the eeprom
gethex(2); // discard the checksum
getsym(); // and re-prime the parser
}
#endif
else {
getexpression();
retval = expval;
}
if (sym == s_semi) getsym(); // eat trailing ';'
return retval;
}
// Parse and execute a list of statements separated by semicolons
//
//
numvar getstatementlist(void) {
numvar retval = 0;
while ((sym != s_eof) && (sym != s_returning)) retval = getstatement();
return retval;
}
