On Wednesday 24 December 2008 16:23, Abhishek Reddy wrote: > Hi, > > http://clojure.org/reader says symbols "begin with a non-numeric > character and can contain alphanumeric characters and *, + ..." > > What are the numeric characters? It seems to include '+' and '-' as > well as digits -- is that correct, and are there any more? > > Cheers
For something as simple as this (as well as things far more complex), it never hurts to include a few examples (transcripts of Clojure REPL interactions) that illustrate you issue. Anyway, it seems that if a token begins with '+' or '-' and is immediately followed by a digit or a decimal point, then the parser is committed to decoding a number and if the sequence of characters so beginning and continuing through until a white-space character (including ',') cannot be validly construed as or decoded to a number, then some sort of failure results. The only possible anomaly I've been able to detect is this: user=> +.0 java.lang.ClassNotFoundException: +.0 As far as I can tell, any input subsequence (either initial or following a white-space or comma separator) that begins with '+' or '-' and whose next character is a decimal point will yield this error. A sequence beginning with '+' or '-' and followed by a (non-white-space) character that is not a digit and not a decimal point will be decoded as a symbol. Considering the particular error elicited, I suspect some sort of bug. At a minimum, it seems a "sub-optimal" indication of an unacceptable input sequence. Randall Schulz --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
