Crunch CRiSP File Editor 6 - Manual (Page 25)

Page 25
Primitive Description
bookmark_list List of bookmarks (placeholders).
command_list List of primitives built into CRiSP.
dict_list List of all symbols defined in a dictionary.
file_glob List of files matching a wild card pattern.
key_list Get keyboard bindings.
list_of_bitmaps List of all bitmaps and pixmaps in a .xpl file.
list_of_buffers List of all buffer IDs.
list_of_dictionaries List of all object dictionaries..
list_of_keystroke_macros List of all defined keystroke macros.
list_of_objects List of all user defined dialog boxes.
list_of_screens List of all screens (peel off windows).
list_of_windows List of all windows in the current screen.
macro_list List of macros defined.
{button See Also, ALink(crunch,,,)}
The declare datatype
The declare keyword is used to create a polymorphic variable. A polymorphic variable is one in which the
type of the variable stored can be changed. These are normally used as function parameters when it is not
known until run-time what the actual type will be, or for looking at elements in a list. The actual type of a
polymorphic variable is frozen when a new value is assigned to it, and until a new value is assigned the
function can treat the type of the variable as if it were of the type frozen. For example:
declare var;
var = 1.0;
var += 2.3;
/* var now contains value 3.3 */
var = "string";
var += "fred";
var = NULL;
/* Variable contains no value. */
{button See Also, ALink(crunch,,,)}
Structures
CRUNCH supports a minimal 'struct' facility. A structure is represented internally as a list but the usual X.Y
syntax allows convenient access to elements of a list/structure without having to manually #define indices.
Structures can be nested as in C. The order of definition of members of a structure is used to access
particular indices into a list structure. There is no concept of 'structure' padding as a CRUNCH structure is
not directly mapped on to a memory block.
{button See Also, Alink(crunch,,,)}
Language Grammar
The CRUNCH language is very similar to ANSI C. The following sections describe features of the language
grammar:
→
Declarations(pg. 26).