# array.h | documentation

    #charset "us-ascii"

    /*
     *   Copyright (c) 2000, 2002 Michael J. Roberts
     *
     *   This file is part of TADS 3.
     */

    #ifndef _ARRAY_H_
    #define _ARRAY_H_

    /*
     *   'Array' intrinsic class
     */
    intrinsic class Array 'array/030006'
    {
        /*
         *   Create a list with the same elements as the array.  If 'start' is
         *   specified, it's the index of the first element we store; we'll
         *   store elements starting at index 'start'.  If 'cnt' is specified,
         *   it gives the maximum number of elements for the new list; by
         *   default, we'll store all of the elements from 'start' to the last
         *   element.
         */
        toList(start?, cnt?);

        /* get the number of elements in the array */
        length();

        /*
         *   Copy from another array or list.  Elements are copied from the
         *   source array or list starting at the element given by
         *   'src_start', and are copied into 'self' starting at the index
         *   given by 'dst_start'.  At most 'cnt' values are copied, but we
         *   stop when we reach the last element of either the source or
         *   destination values.
         */
        copyFrom(src, src_start, dst_start, cnt);

        /*
         *   fill with a given value, starting at the given element (the first
         *   element if not specified), and running for the given number of
         *   elements (the remaining elements of the array, if not not
         *   specified)
         */
        fillValue(val, start?, cnt?);

        /*
         *   Select a subset of the array.  Returns a new array consisting
         *   only of the elements of this array for which the callback
         *   function returns true.
         */
        subset(func);

        /*
         *   Apply a callback function to each element of the array.  For each
         *   element of the array, invokes the callback, and replaces the
         *   element with the return value of the callback.  Modifies the
         *   array in-place, and returns 'self'.
         */
        applyAll(func);

        /*
         *   Find the first element for which the given condition is true.
         *   Apply the callback function (which encodes the condition to
         *   evaluate) to each element in turn, starting with the first.  For
         *   each element, if the callback returns nil, proceed to the next
         *   element; otherwise, stop and return the index of the element.  If
         *   the callback never returns true for any element, we'll return
         *   nil.
         */
        indexWhich(cond);

        /*
         *   Invoke the callback on each element, in order from first to last.
         *   No return value.
         */
        forEach(func);

        /*
         *   Apply the callback function to each element of this array, and
         *   return a new array consisting of the results.  Effectively maps
         *   the array to a new array using the given function, leaving the
         *   original array unchanged.
         */
        mapAll(func);

        /* get the index of the first match for the given value */
        indexOf(val);

        /*
         *   Find the first element for which the given condition is true, and
         *   return the value of the element.
         */
        valWhich(cond);

        /* find the last element with the given value, and return its index */
        lastIndexOf(val);

        /*
         *   Find the last element for which the condition is true, and return
         *   the index of the element.  Applies the callback to each element
         *   in turn, starting with the last element and working backwards.
         *   For each element, if the callback returns nil, proceeds to the
         *   previous element; otherwise, stops and returns the index of the
         *   element.  If the callback never returns true for any element,
         *   we'll return nil.
         */
        lastIndexWhich(cond);

        /*
         *   Find the last element for which the condition is true, and return
         *   the value of the element
         */
        lastValWhich(cond);

        /* count the number of elements with the given value */
        countOf(val);

        /* count the number of elements for which the callback returns true */
        countWhich(cond);

        /* create a new array consisting of the unique elements of this array */
        getUnique();

        /*
         *   append the elements of the list or array 'val' to the elements of
         *   this array, then remove repeated elements in the result; returns
         *   a new array with the unique elements of the combination
         */
        appendUnique(val);

        /*
         *   Sort the array in place; returns 'self'.  If the 'descending'
         *   flag is provided and is not nil, we'll sort the array in
         *   descending order rather than ascending order.
         *
         *   If the 'comparisonFunction' argument is provided, it must be a
         *   callback function; the callback takes two arguments, and returns
         *   an integer less than zero if the first argument value is less
         *   than the second, zero if they're equal, and an integer greater
         *   than zero if the first is greater than the second.  If no
         *   'comparisonFunction' argument is provided, or it's provided and
         *   its value is nil, we'll simply compare the array elements as
         *   ordinary values.  The comparison function can be provided for
         *   caller-defined orderings, such as ordering a set of objects.
         */
        sort(descending?, comparisonFunction?);

        /*
         *   Append an element to the vector.  This works just like insertAt()
         *   with a starting index one higher than the length of the vector.
         *   This has almost the same effect as the '+' operator, but treats a
         *   list value like any other value by simply inserting the list as a
         *   single new element (rather than appending each item in the list
         *   individually, as the '+' operator would).
         */
        append(val);
    }

    #endif /* _ARRAY_H_ */

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