A quite distinct descendant of SNOBOL , developed by Griswold et al in 1967. SNOBOL4 is declarative with dynamic scope . Patterns are first-class data objects that can be constructed by concatenation and alternation. Success and failure are used for flow control . Delayed (unevaluated) expressions can be used to implement recursion . It has a table data type. Strings generated at run time can be treated as programs and executed.
See also vanilla .
ftp://apple.com/ArchiveVol1/Unix_lang .
["The SNOBOL4 Programming Language", Ralph E. Griswold et al, P-H 1971].
(1994-11-04)