2699
2700
2701
2702
2703
2704
2705
2706
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2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
|
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
|
% Successful match; the result is the length of the matched slice.
A "delimited string" in this block is delimited by any printable
character on both sides (except a character with code less than 32).
(The above list of pattern codes maybe it isn't explained very well;
hopefully someone else know how to improve it better.)
After the instructions for a % block is executed, there should be only one
or zero items on the stack. If none, then this one is ignored; if there is
one, then it is added to the accumulation. For all three kinds, if only one
value is given it can use that even if it is not a number.
After the instructions for a : block is executed, the possible cases are:
* The stack is empty, or contains only a mark: The result is null.
* The stack contains only a number: The result is that number. It will be
treated as signed or unsigned according to the column type.
* The stack contains one or more items, of which the first (bottom) one is
a string: Concatenates all of them together, which can be strings, numbers
(treated as unsigned), or classes. All formatting codes of strings will be
stripped, so that the result will be a unformatted string.
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