This document explains the SQL functions and SQL tables which are
available for the user customization in Free Hero Mesh. (You cannot
use SQL to define the rules of the game.)
=== Functions ===
Asterisks denote aggregate/window functions.
BASENAME()
The base name, which is a copy of the first command-line argument (not
counting the switches or the program name).
BCAT(...)
Concatenate several blobs. Nulls are skipped, if any.
BYTE(...)
Make a blob; each argument is a number, of which the low 8-bits are used
to make the value of one byte in the blob, so the size of the blob will
then be the same as the number of arguments.
CL(text)
Returns the class number, given the class name. If there is no such
class, then the result is null. (This may be useful as a shortcut when
used with the "OBJECTS" or "CLASSES" table.)
CLASS_DATA(id,info)
Returns data about a class.
0 = ID
1 = Temperature
2 = Shape
7 = First usable image
12 = Misc4
13 = Misc5
14 = Misc6
15 = Misc7
18 = Arrivals
19 = Departures
33 = Invisible
35 = UserState
37 = Player
39 = Stealthy
40 = VisualOnly
64 = Density
65 = Volume
66 = Strength
67 = Weight
69 = Height
70 = Climb
128 = Volume fraction
130 = CollisionLayers
132 = Compatible
CVALUE(number)
Makes a game value of type 'class', given the class number. You can also
specify the class name instead of the number.
HASH(data,algorithm)
Make the hash of the data as a binary blob. See hash.h for a list of the
valid numbers to use as the hash algorithm numbers.
HEROMESH_ESCAPE(blob)
Converts blob representation of a game string into escaped format.
HEROMESH_TYPE(value)
The type of a game value, given as a 64-bit integer. The types are
'class', 'number', 'string', 'object', and 'sound'.
HEROMESH_UNESCAPE(text)
Converts escaped representation of a game string into text format.
INRECT(x,y)
True if the coordinates are inside of the current selection rectangle.
If no selection rectangle is set, then the result is null.
LEVEL()
The one-based order number of the current level.
LEVEL_CACHEID()
The user cache ID of the level file.
LEVEL_ID()
The ID number of the current level.
LEVEL_TITLE()
The title of the current level, as a blob.
LOAD_LEVEL(level_id)
Only valid when Free Hero Mesh is invoked with the -x switch. Loads
the level with the specified ID number.
MAX_LEVEL()
The number of levels in this puzzle set (equal to the maximum valid
level order number).
MVALUE(number)
Makes a game value of type 'message'.
MODSTATE()
The SDL keyboard modifier state.
MOVE_LIST()
Return the current move list as a blob.
MOVENUMBER()
Return the number of moves executed so far since the level restarted.
NVALUE(number)
Makes a game value of type 'number'. Same as ZERO_EXTEND.
OVALUE(number)
Makes a game value of type 'object'. The argument is the ID number of
the object in the OBJECTS table.
PICTURE_SIZE()
Tell you the picture size.
PIPE(command)
Execute a operating system shell command and return the output of that
command as a blob.
READ_LUMP_AT(offset,ptr)
Used internally; there is no way to use this in user SQL codes.
RECT_X0()
X0 coordinate of selection rectangle.
RECT_X1()
X1 coordinate of selection rectangle.
RECT_Y0()
Y0 coordinate of selection rectangle.
RECT_Y1()
Y1 coordinate of selection rectangle.
RESOURCE(...)
Given the list of resource names, read a value from the X resource
manager. Returns null if there is no such resource value.
SIGN_EXTEND(number)
Sign extends a 32-bit number to 64-bits.
SOLUTION_CACHEID()
The user cache ID of the level file.
SOLUTION_MOVE_LIST(boolean)
Returns the solution move list. If the boolean value is true, then it
always loads it even if the level version number doesn't match.
TRACE_OFF()
Disables tracing when called.
TRACE_ON()
Enables tracing when called.
XY(x,y)
Many bindings require a position as their first argument; use this
function to combine X/Y coordinates into a single value for this.
Coordinates are one-based. This is the same as (x+y*64).
ZERO_EXTEND(number)
Zero extends a 32-bit number to 64-bits. Same as NVALUE.
=== Tables ===
Asterisks denote virtual tables. (The only disk tables are USERCACHEDATA
and USERCACHEINDEX; all others are eiter temporary or virtual.)
CREATE TABLE "BIZARRO_OBJECTS"("ID" INTEGER PRIMARY KEY, "CLASS" INT,
"MISC1" INT, "MISC2" INT, "MISC3" INT, "IMAGE" INT, "DIR" INT, "X" INT,
"Y" INT, "UP" INT, "DOWN" INT, "DENSITY" INT HIDDEN); *
See OBJECTS; this is for the bizarro world only.
CREATE TABLE "CLASSES"("ID" INTEGER PRIMARY KEY, "NAME" TEXT, "EDITORHELP"
TEXT, "HELP" TEXT, "INPUT" INT, "QUIZ" INT, "TRACEIN" INT, "TRACEOUT" INT,
"GROUP" TEXT, "PLAYER" INT); *
A list of classes in the current puzzle set; mostly read-only. Only
QUIZ, TRACEIN, and TRACEOUT are writable. If TRACEIN is true then it
will trace messages received by this class (if tracing is enabled). If
TRACEOUT is true then it will trace messages sent by this class (if
tracing is enabled).
CREATE TEMPORARY TABLE "DIVISIONS"("HEADING" BLOB NOT NULL, "FIRST" INT
NOT NULL);
The list of level divisions. The HEADING is the (unformatted) heading
text, and the FIRST is the order number (not ID number) of the first
level to which this heading applies. (Note: Writing to this table by
use of SQL statements will not automatically update the puzzle set.
However, if you use SQL and then use the level index editor, then that
will make the changes permanent.)
CREATE TABLE "INVENTORY"("ID" INTEGER PRIMARY KEY, "CLASS" INT, "IMAGE"
INT, "VALUE" INT); *
This table contains the current inventory, and is read-only. It is not
meaningful in the editor.
CREATE TEMPORARY TABLE "LEVELS"("ID" INTEGER PRIMARY KEY, "ORD" INT,
"CODE" INT, "WIDTH" INT, "HEIGHT" INT, "TITLE" BLOB, "SOLVED" INT,
"SOLVABLE" INT); *
This table contains a list of the levels in the current puzzle set. The
SOLVED column is 1 if the current user has solved the level or 0
otherwise; the SOLVABLE column is 1 if a solution is stored for this
level or 0 otherwise (it doesn't validate the solution; to do that, use
the -a switch instead). Although you can write to this table after it
has been read once (this table uses lazy loading), you should not do so,
since the changes will not be saved. There may be additional columns in
this table in some puzzle sets (defined in the (LevelTable) block in the
class definition file); if so, these extra columns come after the ones
listed above, and their names will always start with a underscore.
CREATE TABLE "MESSAGES"("ID" INTEGER PRIMARY KEY, "NAME" TEXT, "TRACE"
INT); *
The list of messages in the current puzzle set; mostly read-only. Only
TRACE is writable; if true, this message will be traced.
CREATE TABLE "OBJECTS"("ID" INTEGER PRIMARY KEY, "CLASS" INT, "MISC1" INT,
"MISC2" INT, "MISC3" INT, "IMAGE" INT, "DIR" INT, "X" INT, "Y" INT, "UP"
INT, "DOWN" INT, "DENSITY" INT HIDDEN); *
List of objects. Read-only during the game, writable in the editor.
CLASS is a class number (the ID in the CLASSES table), DIR is the
direction (where 0 is east, 7 is southeast), and MISC1, MISC2, MISC3
are the game values for the initial Misc values of this object; they
must be numbers, classes, messages, or strings. Once an object is
created, you cannot change its class; you must delete it and then add
a new object of the correct class. DENSITY is read-only, but you can
use ORDER BY DENSITY to sort in the stacking order of the objects.
UP and DOWN are also read-only.
CREATE TEMPORARY TABLE "PICTURES"("ID" INTEGER PRIMARY KEY, "NAME" TEXT
COLLATE NOCASE, "OFFSET" INT, "DEPENDENT" INT);
List of all pictures available in this puzzle set.
CREATE TABLE "PLAYFIELD"("X" INT, "Y" INT, "OBJ" INT, "BIZARRO_OBJ" INT); *
All playfield cells, with their coordinates and bottom objects.
CREATE TABLE "USERCACHEDATA"("ID" INTEGER PRIMARY KEY, "FILE" INT,
"LEVEL" INT, "NAME" TEXT COLLATE NOCASE, "OFFSET" INT, "DATA" BLOB,
"USERSTATE" BLOB);
Contains the user cache data for the .level and .solution files of each
puzzle set, in order to speed up loading and saving. The DATA will be
null unless the data has changed, in which case the new data is stored
here; it will later rewrite the Hamster archive with the new data and
then it will be set to null again. USERSTATE contains user data such as
the list of moves made by the player. FILE is the ID in the user cache
index, and indicates which Hamster archive file this lump belongs to.
(The USERSTATE column of this SQL table is not related to the UserState
variable of objects in the game.)
CREATE TABLE "USERCACHEINDEX"("ID" INTEGER PRIMARY KEY, "NAME" TEXT,
"TIME" INT);
The user cache index; contains one record for each .level and .solution
file of all puzzle sets which have been loaded. NAME is the full path,
and TIME is the UNIX timestamp. If you want to delete a record, then
you should also delete all records from USERCACHEDATA whose FILE value
is the same as the ID value in this table for which it is deleted. You
should not touch it while Free Hero Mesh is running, though. If it is a
composite puzzle set, then NAME consists of the full path prefixed by
L// for the level file or S// for the solution file (this will then
probably be followed by a third slash indicating the root directory).
CREATE TEMPORARY TABLE "VARIABLES"("ID" INTEGER PRIMARY KEY, "NAME" TEXT);
List of all global and local user variables used in the game.