Free Hero Mesh

this case, a warp occurs. The movement is restarted, using the specified
object as the origin of the movement, and that object's direction as the
direction of movement.


=== Pattern matching ===

Where an instruction is expected, you can have pattern matching. This can
be (P <pattern...>) or (,P <pattern...>) where the first one uses the
current location, and the second kind uses the position and direction of
the specified object as the matching. It pushes the found object to the
stack, or pushes zero if the pattern does not match.

<class>
  Match an object of the specified class.

<dir>
  Move in the specified direction. (This does not move any objects; it
  only moves the cursor for pattern matching.) The direction can be
  relative to the current direction (initially the Dir variable of the
  origin object) or absolute.

<message>
  Send the message to all objects at the current location. From is the
  position from which pattern matching started. Arg1 is the direction.
  Arg2 is the currently matched object (which may be zero). If the
  return value is zero, it continues normally; if one, the match fails;
  if two, it continues without sending more messages at this location;
  if an object, sets the matched object and current location.

<userflag>
  Match an object with the specified flag.

,<userflag>
  Fail if there are any objects having the specified flag here.

+
  Push the matched object to the stack.

-
  Push zero to the stack.

*
  Update the current choice point with the location and direction.

_
  Push a mark to the stack.

again
  End a block with begin or if, allowing it to occur more than once; it
  is repeated until it no longer matches. If the first word is begin,
  then it must match at least once; if it is if, then it can match zero
  or more times. The match is greedy; it will match as much as possible.

begin
  Begin a block.

Climb
  Fail the match if the origin object cannot climb here.

(Climb <number>)
  Fail the match if the height here is greater than this number.

cut
  Discards the most recent choice point.

else
  Delimits alternatives within a block.

Four
  Try four directions (E, N, W, and S).

Eight
  Try all eight directions.

Height
  Fail the match if the origin object can climb here.

(Height <number>)
  Fail the match if the height here isn't greater than this number.

if
  Begin a block that can optionally match.

ObjAbove
  Match the object above the currently matched object.

ObjBelow
  Match the object below the currently matched object.

ObjBottomAt
  Match the object at the bottom of this location.

ObjTopAt
  Match the object at the top of this location.

then
  Ends a block started with begin or if.

Trace
  Used for debugging.


=== Compatibility ===

Compatible objects have the following differences from the default:

* VisualOnly implies Stealthy.