The Star Fox barrel roll effect is achieved using a script which spawns a new ship. The script sets no-collide on this spawned ship, but it also tries to set the ship flag for all future ships -- and future ships require a parse object, which doesn't exist for a created ship. This patches the FALLTHROUGH in the sexp code to account for that possibility.
Separately, there are other ways a parse object pointer could become null through unusual code states, so this adds an INVALID status and several additional checks to defend against this crash in other circumstances.
Adds a `DEATH_ROLL` status to specifically cover the state after ships have been destroyed but before they exit. I've also audited all code that interacts with the ship registry to use the correct state with this new state taken into consideration.
This fixes access to exploding ships that was broken when the ship registry framework was introduced. In particular, the `when destroyed X beam-lock-all X` QoL feature now works again.
The `collides` and `no_collide` flags are equivalent, but opposite. So when sexps or scripts get or set those flags, allow each to be used as an anti-synonym (not exactly an antonym) for the other.
As reported by Colt, there was a crash in the in-mission jump sequence in Shepherds where the mission previously worked. The proximate cause was a handwritten SEXP called via script that omitted whitespace before an opening parenthesis. This was incorrectly recognized by the upgraded SEXP parser as an invalid SEXP. Unfortunately, a separate bug in `get_line_num()` caused a crash when the parser tried to display a warning, because the function tried to calculate the line number of a SEXP that did not come from a parsed file.
This commit fixes the parser to recognize opening parentheses even when no whitespace precedes them, moves the output to the 'unexpected end of sexp' warnings will they will now be seen, and fixes `get_line_num()` to work when there is no parsed text.
Follow-up to #5520.
Three fixes:
1. In commit fa0878b6b3 for PR #5338, the optional distance parameter was inadvertently changed to a bool. This fixes the parameter.
2. The distance parameter was previously parsed using `atoi` which works for number literals, so change to `eval_num` to allow sexp return values.
3. Make `eval_num` consistent with `eval_sexp` in the sense that evaluating an empty list is valid and returns false or 0.
Also takes advantage of the fact that `is_sexp_true` works for empty lists to streamline optional arguments in `ai_add_goal_sub_sexp`.
The hud-set-coords SEXP has always used exact pixels, without regard for the current screen resolution. This adds a similar scaling mechanism as is used for show-subtitle.
Fixes#5525.
* fast version of setting position and orientation
* preliminary stale collide time
* add global collision cache stale flag instead
* clean up
* more clean up
* no periods >.>
* bring back single object version
* rename and bring back stale object list
* use a set
In at least two instances, `split_str_once()` can be called with width values derived from mod-supplied values that can be 0 or less (specifically, two hud gauges: if `+Messages:` has a `Max Width:` that's too small, or `+Directives:` has a `Max Line Width:` of 0 or less). Since user-supplied code shouldn't be tripping assertions, I looked into adding security around the calling sites when I realized that the assertion wasn't actually protecting against anything; the function would run just fine with a negative pixel width, it would just break with every whitespace. Since both calling sites that could trip the assertion already treat getting `src` back as output as an "I can't split this" error condition, it's perfectly fine (and skips iterating through the string) to just `return src` if the maximum pixel width is 0 or less, so let's just do that instead. Technically this is a behavior change in Release code, but the result of the old code would've been to spam the message log with every individual word in every message (if `Max Width:` was too small), and for directives to seemingly-randomly split only after the first word (if `Max Line Width:` was 0 or less). Not splitting at all is at least as correct, saves some pointless processing, and *should* still be obviously wrong if there was supposed to be a reasonable width value.
1. Deprecate the old set-jumpnode-name sexp now that there is a set-jumpnode-display-name
2. Make the display name design consistent with ships and weapons; in particular add a `HasDisplayName()` function and automatically generate the display name for hash-truncated names
3. Keep the display name in sync when the name is changed in the FRED dialog
4. Fix the overriding of hash-truncated names with display names on the HUD
5. Fix the incorrect setting of the alphacolor flag when using FRED
6. Fix array out-of-bounds access when no object is selected
Follow-up to #5401.
1. Add a function to retime *only* the collision pairs involving a specific object. This is useful when only one object has moved, since only collisions involving that object are affected.
2. Use this function when objects are moved for autopilot, via sexp, and via script.
Previously collision pairs were not retimed when objects were moved via script, leading to bugs. This fixes that.
* refactor how asteroid wrapping is done and setup for allowing or disallowing range check
* allow fred to toggle enhanced spawn checking
* field naming adjustment
* some minor tweaks
* Add sexp compatibility
* We don't need to save the boolean, just the string.
* full qtFRED support
The `SCP_string_lcase_equal_to()()` and `SCP_string_lcase_less_than()()` functors are rather unwieldy to use in non-functor situations, so this adds conventional function equivalents.
Related to #5267, and again concerned with the original check for event delay:
```
if ( (fix) Mission_events[i].timestamp + delay >= Missiontime )
return SEXP_FALSE;
```
For events that were never evaluated at all, their timestamp remained 0. Thus the function did not return and the status of the event (which by definition was incomplete) was always checked.
After the timestamp refactoring, this comparison always returned SEXP_FALSE for these events. The correct behavior is to bypass invalid timestamps so that the status of the event is always checked.
This fixes the behavior of `is-event-false-delay` in debriefings.
In retail, number parsing picked up immediately at the character after the number parsed, so parsing `0.50` as an int would yield 0, and then the next available characters would be `.50`. Even though parsing has been tightened up and made stricter, we can still "fail gracefully" by simulating the old behavior. And when failing gracefully, the message can be a warning.
Since `rand_sexp` also writes text into the sexp node for the seed value, its cache should be cleared too. And since this is a pretty common operation, wrap it in a `clear_cache` function.
Follow-up to #5381.
The `rand` SEXP stores the result of its first call in the "low" node. Prior to PR #2402, this worked fine, but after that, the value is cached when first evaluated, meaning that subsequent calls to the `rand` SEXP will always return the lowest value in the range, not whatever number was rolled the first time.
This commit makes it so that writing the rolled value to the node's `text` attribute is immediately followed by deleting the no-longer cached value, so that the SEXP continues to work as intended.
* Fix max Z speed when using ETS and engine damage tracking
Follow up for #5137 and #5292. This engine strength check thus needs to be added to all instances where `max_vel.xyz.z` is updated, so a function was created and added in respective locations. Fixes#5367.
* cleanup and adding validity assertations
* cleanup outdated comments
* might as well make the cleanup look nice
* update to account for more edge cases
* cleanup
Tyler Blount