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|
% read
/_readline { print flush (%stdin) (r) file 99 string readline } def
/READ {
% just "return" the input string
/str exch def
str
} def
% eval
/EVAL {
% just "return" the "ast"
/env exch def
/ast exch def
ast
} def
% print
/PRINT {
% just "return" the expression
/exp exch def
exp
} def
% repl
/REP { READ (stub env) EVAL PRINT } def
% repl loop
{ %loop
(user> ) _readline
not { exit } if % exit if EOF
REP print (\n) print
} bind loop
(\n) print % final newline before exit for cleanliness
quit
|
