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51 lines
2.4 KiB
Plaintext
51 lines
2.4 KiB
Plaintext
New features in CGOL 74. Please report any bugs to MJF;.
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[1] The lexical syntax has been cleaned up a little. An altmode
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may be included in a character string or in a comment by
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preceeding it with the escape character "?". An unprotected
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altmode now causes an error. To put a quote character (")
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into a character string, it must be doubled.
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[2] CGOLREAD now takes an argument which is treated just like
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the argument to READ. Namely, if CGOLREAD encounters an end-of-file
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as the first thing upon being called, the argument is returned;
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otherwise it is assumed that there follows a complete CGOL
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expression followed by the input terminator (an altmode or dollar).
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If not, an error is reported. If the argument is NIL, then
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initial end-of-files are passed over. Sometime in the future,
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the argument may become optional, but for now it is required.
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[3] The necessary changes for compatibility with [2] have been made
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in MAKLISP.
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[4] A new bracketing operator "OCT" allows the reading of a
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portion of CGOL text with IBASE=8 so numbers are read in octal
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(unless followed by a dot). The following text MUST be
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enclosed in parentheses. E.g. oct(12) $ prints 10., and
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oct(12+14) prints 22.
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[5] Tokens may now be composed of multiple characters. NEWTOK "foo" defines
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the string foo to be a token. It may then be used like any
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other token, e.g. appear in infix, prefix, and define statements,
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be used as a variable, etc. There are two points of caution.
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(i) The only characters which may appear as the FIRST character
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of such a token are special characters other than quote ("),
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percent (%), exclamation (!), dollar, altmode, and question mark (?).
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(ii) Every prefix of a multiple character token also becomes
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a token. Thus, defining NEWTOK "*-*" causes 2*-3 to parse
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incorrectly. Of course, 2* -3 will still work all right.
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[6] New bit-vector operators have been defined using the multiple
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character token feature described above. They are:
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.N. - complement;
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.A. - logical and;
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.V. - logical or;
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.X. - exclusive or;
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.^. - left shift.
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[7] The current version of CGOL may be fasloaded from COM: CGOL FASL.
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Two other ways of invoking it are: (i) Type
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(CGOL) or (CGOLREAD) at LISP (they have autoload
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properties); or (ii) Type :L CGOL; when you start
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your LISP.
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