Idiomatically determine all the characters that can be used for symbols: Difference between revisions
Idiomatically determine all the characters that can be used for symbols (view source)
Revision as of 19:41, 26 April 2015
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Here, [http://www.jsoftware.com/help/dictionary/dadot.htm a.] is the set of chararacters we are testing. We prefix each of these with an arbitrary letter, and suffix each with an arbitrary character and then try counting how many parsed tokens are formed by the result. If the token count is 1, then that character was a legal word-forming character.
Of course, we also only need to do this once. Once we have a set of these characters, it's faster and easier to use a set membership test on the characters themselves than on the expression which generates them.
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