(*
* <COPYRIGHT>
* Copyright 2002 Joachim Schrod Network and Publication Consultance GmbH, Gerd Stolpmann
*
* <GPL>
* This file is part of WDialog.
*
* WDialog is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* WDialog is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with WDialog; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* </>
*)
(* $Id: wd_var_functions.mli,v 1.6 2005-06-11 14:24:14 stolpmann Exp $
* ----------------------------------------------------------------------
*
*)
(** This module defines the "variable functions" that can be called in
* [$[...]] expressions. All these functions take formally a list of
* [var_value] arguments and return a [var_value]. Actually, they are
* often only defined for a certain number of arguments, and for arguments
* of certain type.
*
* The functions raise a [Failure] exception if something is wrong.
*)
open Wd_types
val id : dialog_type -> var_value list -> var_value
(** Returns the first argument *)
val length : dialog_type -> var_value list -> var_value
(** Returns the length of the single string argument in characters.
*)
val card : dialog_type -> var_value list -> var_value
(** Returns the cardinality of the single argument. The cardinality are the
* number of iterations <ui:iterate> or <ui:enumerate> would do for a
* variable with the given value:
* - For a string: the number of words of the string
* - For an enumerator: the number of elements
* - For an association: the number of elements
*)
val size : dialog_type -> var_value list -> var_value
(** Returns the size of the single argument, which may be a [String_value],
* [Enum_value], [Dyn_enum_value], or an [Alist_value].
* The returned size is encoded as [String_value].
*
* {b [size] is deprecated! Use either [length] or [card] instead!}
*)
val add : dialog_type -> var_value list -> var_value
(** Adds the numbers encoded as [String_value], and returns the sum as
* [String_value].
*)
val sub : dialog_type -> var_value list -> var_value
(** Subtracts the following numbers from the first number. All numbers
* must be encoded as [String_value]. Returns the result as
* [String_value].
*)
val mul : dialog_type -> var_value list -> var_value
(** Multiplies the numbers encoded as [String_value], and returns the product
* as [String_value].
*)
val div : dialog_type -> var_value list -> var_value
(** Divides the first number through the following numbers. All numbers
* must be encoded as [String_value]. Returns the result as
* [String_value].
*)
val modulo : dialog_type -> var_value list -> var_value
(** The first number module the second number. Both numbers
* must be encoded as [String_value]. Returns the result as
* [String_value].
*)
val assoc : dialog_type -> var_value list -> var_value
(** Looks the second argument up in the first argument, which must be
* an [Alist_value]. The index, i.e. second argument, must be an
* [String_value].
*)
val nth : dialog_type -> var_value list -> var_value
(** Returns the nth element of the first argument which must be an
* [Alist_value]. The second argument is the position, a number encoded
* as [String_value].
*)
val contains : dialog_type -> var_value list -> var_value
(** Returns 1 if the first argument contains the second argument, and 0 otherwise.
* The second argument must be a string value. The function is defined as follows:
* - If the first argument is a string, it is split up into a list of words,
* and it is tested whether the second string occurs in the list of words.
* - If the first argument is a declared enumerator, it is tested whether
* the value includes the string as item.
* - If the first argument is a dynamic enumerator, it is tested whether
* the value includes the string as internal item.
* - If the first argument is an associative list, it is tested whether
* the value includes the string as index.
*)
val mentions : dialog_type -> var_value list -> var_value
(** Returns 1 if the first argument contains the second argument, and 0 otherwise.
* The second argument must be a string value. The function is defined as follows:
* - If the first argument is a dynamic enumerator, it is tested whether
* the value includes the string as external item.
* - If the first argument is an associative list, it is tested whether
* the value includes the string as mapped value.
*)
val translate : dialog_type -> var_value list -> var_value
(** Like ui:translate maps internal values of enumerators to external
* values. The function takes two arguments:
*
* - [translate [dyn; int]]: The first argument is a dynamic enumerator,
* and the second argument is the internal value to translate to the
* external value
* - [translate [type; int]]: The first argument denotes a declared
* enumerator (as a string), and the second argument is the internal
* value to translate to the external value
*)
val rev_translate : dialog_type -> var_value list -> var_value
(** Maps external values to internal values:
*
* - [rev_translate [dyn; int]]: The first argument is a dynamic enumerator,
* and the second argument is the external value to translate to the
* internal value
* - [translate [type; int]]: The first argument denotes a declared
* enumerator (as a string), and the second argument is the external
* value to translate to the internal value
*)
val eq : dialog_type -> var_value list -> var_value
(** Compares two strings, and returns 1 when equal and 0 when not equal *)
val ne : dialog_type -> var_value list -> var_value
(** Compares two strings, and returns 0 when equal and 1 when not equal *)
val match_ : dialog_type -> var_value list -> var_value
(** Checks whether the first string matches the regular expression in the
* second string, and returns 1 on match and 0 otherwise
*)
val nomatch : dialog_type -> var_value list -> var_value
(** Checks whether the first string matches the regular expression in the
* second string, and returns 0 on match and 1 otherwise
*)
val substring : dialog_type -> var_value list -> var_value
(** Returns a substring of the first argument, a [String_value]. The
* following forms are accepted:
*
* - [substring [s; pos; length]]: The second argument is the position,
* and the third argument is the length. The length can be negative.
* - [substring [s; pos]]: Only the position is passed. Returns the
* substring beginning at this position until the end of the string.
*
* If the start position or end position of the substring is outside
* the possible range, only the part of the substring is returned that
* is inside the possible range.
*)
val concat : dialog_type -> var_value list -> var_value
(** Concatenates all the [String_value] arguments, and returns the
* result as [String_value].
*)
val int_eq : dialog_type -> var_value list -> var_value
val int_ne : dialog_type -> var_value list -> var_value
val int_lt : dialog_type -> var_value list -> var_value
val int_le : dialog_type -> var_value list -> var_value
val int_gt : dialog_type -> var_value list -> var_value
val int_ge : dialog_type -> var_value list -> var_value
(** These functions compare two strings as integers, and return 1 if the
* condition is fulfilled, and 0 if not. The conditions are:
* - int_eq: The integers are equal
* - int_ne: The integers are not equal
* - int_lt: The first integer is less than the second integer
* - int_le: The first integer is less or equal than the second integer
* - int_gt: The first integer is greater than the second integer
* - int_ge: The first integer is greater or equal than the second integer
*)
val int_min : dialog_type -> var_value list -> var_value
val int_max : dialog_type -> var_value list -> var_value
(** These functions compute the minimum/maximum of all integer arguments *)
val int_abs : dialog_type -> var_value list -> var_value
val int_sign : dialog_type -> var_value list -> var_value
(** These functions compute the absolute value/the sign of the first integer
* argument
*)
val card_eq : dialog_type -> var_value list -> var_value
val card_ne : dialog_type -> var_value list -> var_value
val card_lt : dialog_type -> var_value list -> var_value
val card_le : dialog_type -> var_value list -> var_value
val card_gt : dialog_type -> var_value list -> var_value
val card_ge : dialog_type -> var_value list -> var_value
(** These functions compare the cardinality of the first argument with a string taken
* as integer, and return 1 if the condition is fulfilled, and 0 if not.
* The cardinality is defined as for the [card] function.
* The conditions are:
* - int_eq: The cardinality is equal to the integer
* - int_ne: The cardinality is not equal to the integer
* - int_lt: The cardinality is less than the integer
* - int_le: The cardinality is less or equal than the integer
* - int_gt: The cardinality is greater than the integer
* - int_ge: The cardinality is greater or equal than the integer
*)
val height : dialog_type -> var_value list -> var_value
(** Returns the height of the [String_value] argument. The height is
* the number of lines, i.e. the number of LF/CR/CRLF occurrences
* plus 1.
*)
val width : dialog_type -> var_value list -> var_value
(** Returns the width of the [String_value] argument. The width is
* the length of the longest line (not counting the line separators).
*)
val dialog_exists : dialog_type -> var_value list -> var_value
(** When called with only one argument: The function returns 1 if the
* argument is an existing dialog (i.e. [Dialog_value(Some _)]) and
* 0 if the dialog does not exist (i.e. [Dialog_value None]).
*
* When called with two arguments (legacy mode): The first argument must
* be a dialog value as before, and the second argument must be either
* the string "yes" or the string "no". The function returns 1 if the
* existence of the dialog is equivalent to the boolean value of the
* string.
*)
val and_ : dialog_type -> var_value Lazy.t list -> var_value
(** Calculates the logical AND operation for all its arguments: Returns 1 if
* all arguments are non-zero integers, and 0 otherwise.
*)
val or_ : dialog_type -> var_value Lazy.t list -> var_value
(** Calculates the logical OR operation for all its arguments: Returns 1 if
* there is a non-zero integer as argument, and 0 otherwise.
*)
val not_ : dialog_type -> var_value list -> var_value
(** Calculates the logical NOT operation of its single argument: Returns 1
* if the argument is 0, and 0 if the argument is non-zero.
*)
val true_ : dialog_type -> var_value list -> var_value
(** Returns the constant 1 *)
val false_ : dialog_type -> var_value list -> var_value
(** Returns the constant 0 *)
val if_ : dialog_type -> var_value Lazy.t list -> var_value
(** Evaluates the first argument (which must be an integer). If the integer is
* non-zero, the result is the second argument. If the integer is 0, the result
* is the third argument.
*)
val var : dialog_type -> var_value list -> var_value
(** Returns the contents of the variable whose name is passed as
* first argument, a [String_value].
*)
val dialog : dialog_type -> var_value list -> var_value
(** Returns the name of the current dialog (no arguments) *)
val self : dialog_type -> var_value list -> var_value
(** Returns the current dialog (no arguments) *)
val page : dialog_type -> var_value list -> var_value
(** Returns the name of the current page (no arguments) *)
val language : dialog_type -> var_value list -> var_value
(** Returns the current language, or "" if none selected (no arguments) *)
val self_base_url : dialog_type -> var_value list -> var_value
(** Returns the URL pointing to the current script without session state *)
val session_id : dialog_type -> var_value list -> var_value
(** Returns the session ID without checksum *)
val create_anchor_event : dialog_type -> var_value list -> var_value
(** Add an anchor event and return the identifier *)
val create_xanchor_event : dialog_type -> var_value list -> var_value
(** Add an indexed anchor event and return the identifier *)
(* ======================================================================
* History:
*
* $Log: wd_var_functions.mli,v $
* Revision 1.6 2005-06-11 14:24:14 stolpmann
* Extension of bracket expressions: many new functions.
* Functions in bracket expressions may now lazily evaluate their arguments.
* ui:if and ui:ifvar may refer to any functions defined for bracket
* expressions.
* New: ui:ifexpr
* Parsing of bracket expressions is now done with ulex. Private interfaces
* of PXP are no longer used for this purpose.
* Serialization has been rewritten, and it is now safe.
* Fix: In ui:context there may now be macro references at any location.
* Also documented all these changes.
*
* Revision 1.5 2005/06/02 21:14:35 stolpmann
* Improved the configure script a bit.
*
* Revision 1.4 2004/12/12 17:57:32 stolpmann
* Added <q:wd-link> and <q:wd-xlink> to generate links for
* applications that cannot use Javascript. Limited functionality, however.
* See stdlib.xml for details.
*
* Revision 1.3 2003/02/16 01:07:03 stolpmann
* size, substring, width: string positions are measured as
* the number of characters, not as the number of bytes
*
* Revision 1.2 2002/11/03 20:56:56 stolpmann
* New functions: translate, rev_translate
*
* Revision 1.1 2002/10/20 19:38:18 stolpmann
* Initial revision
*
*
*)
