Chapter 4.5: Comparisons & Logic
[TOP] [UP] [PREV] [NEXT]
- $and(a b ...)
- Evaluates to the logical "and" of a and b and ... May have any number of arguments.
- $or(a b ...)
- Evaluates to the logical "or" of a and b and ... May have any number of arguments.
- Evaluates to the logical negation of a.
- $equal(x y)
- If x and y are identical (they may be numbers or strings), evaluates to "1". Otherwise it is "0". Note: $equal() expects that x and y do not contain blanks; if they do, the results are unpredictable. If you must compare multi-word strings, see $quote().
- $not_equal(x y)
- Reverse of $equal().
- Evaluates to "1" if str is completely empty, and "0" otherwise.
- Evalutates to "1" if str is not empty, and "0" if it is completely empty.
- $if(a b c)
- If a is true, evaluates to b. Otherwise, evaluates to c. The classic triadic "if then else" operator. Arguments a and b must be only one word; c may be any length.
- $ifthen(a b)
- If a is a number != 0, evaluates to b; otherwise nothing. B may be of any length. (For some cases, this function may be more convenient than $if().) Note that an a of "Junk" or "0" is considered false, whereas "17" or "5words" are both "true".
- $gen_sort(direction words...)
- Sorts the list of words in ascending (direction > 0) alphabetical order, or descending (direction < 0) alphabetical order. Evaluates to a list of indices to the original list, in sorted order. I.e., $gen_sort (1 a c b) evaluates to "1 3 2".
- $num_sort(direction numbers...)
- If direction is > 0, evaluates to the list of numbers, sorted in ascending numerical order. If direction is < 0, descending numerical order is used.
- $triplet_sort(direction triplet_list...)
- If direction is > 0, evaluates to the list of item triplets, sorted in ascending numerical order. If direction is < 0, descending numerical order is used. In this case, numerical order means the conference number is considered first, then the item number, and finally the response number.
- $item_sort(direction code triplet_list...)
- Evaluates to a sorted triplet list of items. If direction is > 0, sorting is done in ascending order; if < 0, descending order.
Code selects the property used to sort the items. A value of 1 sorts the items alphabetically by title.  A value of 2 sorts alphabetically by the author's full name. A value of 3 sorts by the date of the last (undeleted) response to the item. (For code 1 and 2, the items must all be in the same conference, or the results will be unpredictable.)