Add a basic regular expression engine to the dictiter, and to the UI add
the ability to filter for "starts with", "contains" and "ends with",
which translate into ANDed RE_*, _*RE_* and _*RE, respectively (with
_ standing for blank/wildcard). The engine's tightly integrated with the
next/prevWord() functions for greatest possible speed, but unless
there's no pattern does slow things down a bit (especially when "ENDS
WITH" is used.) The full engine is not exposed (users can't provide raw
REs), and while the parser will accept nesting (e.g. ([AB]_*[CD]){2,5}
to mean words from 2-5 tiles long starting with A or B and ending with C
or D) the engine can't handle it. Which is why filtering for word length
is handled separately from REs (but also tightly integrated.)
Users can enter strings that don't map to tiles. They now get an
error. It made sense for the error alert to have a "Show tiles"
button, so there's now a dialog listing all the tiles in a wordlist,
something the browser has needed all along.
Hungarian is unique (so far) in having two-letter tiles that can be
spelled with one-letter tiles AND in allowing words to be spelled both
ways. This crashed search based on strings because there were
duplicates. So now search is done by tile arrays. Strings are first
converted, and then IFF there is more than one tile array result AND the
wordlist has the new flag indicating that duplicates are possible, THEN
the user is asked to choose among the possible tile spellings of the
search string.
Fixing a problem with languages (like Hungarian) where it's legal to use
a two-letter tile or two single-letter tiles to play the same word. When
words are seen, or searched for, as char-arrays, there are
duplicates. Current code crashes, but there's also risk the user gets
unexpected behavior. Crash is fixed, and foundation laid for better UX,
by doing all searches for tile arrays. If a search string translates to
more than one tile array the user must choose. For that choice to make
sense it's now possible to translate tile[] to char[] with a delimiter
between the tile strings.
digraph tile when at the end of a prefix so that e.g. GORIL in Catalan
will list GORIL·LA (rather than nothing since GORIL, ending with the L
tile, is not a prefix.)
