add some useless file ;)

diff --git a/bf.cfg b/bf.cfg
new file mode 100644 (file)
index 0000000..4195aeb
--- /dev/null
+++ b/bf.cfg
@@ -0,0 +1,98 @@
+// DP console is TURING COMPLETE!
+
+alias _bf_vcall "${$1} ${2- ?}"
+
+// number system
+// Xon RPN: set $_bf_zero 0
+// Xon RPN: alias _bf_inc "rpn /$1 $2 1 add def"
+// Xon RPN: alias _bf_dec "rpn /$1 $2 1 sub def"
+
+// unary
+// decimal | unary
+//       0 | 0
+//       1 | +
+//       2 | ++
+//      -1 | -
+//      -2 | --
+alias _bf_zero "set $1 0"
+alias _bf_one "set $1 +"
+alias _bf_minus_one "set $1 -"
+alias _bf_return_3 "set $1 $3"
+alias _bf_return_4 "set $1 $4"
+set _bf_zero "0"
+alias _bf_inc_loop1 "set _bf_tmp_$3 _bf_inc_loop2; set _bf_tmp_+$2 _bf_return_3; _bf_vcall _bf_tmp_$3 $*"
+alias _bf_inc_loop2 "set _bf_tmp_$2 _bf_inc_loop3; set _bf_tmp_-$4 _bf_return_4; _bf_vcall _bf_tmp_$2 $*"
+alias _bf_inc_loop3 "_bf_inc_loop1 $1 $2 +$3 -$4"
+alias _bf_inc "set _bf_tmp_$2 _bf_inc_loop1; set _bf_tmp_0 _bf_one; set _bf_tmp_- _bf_zero; _bf_vcall _bf_tmp_$2 $1 $2 + -"
+alias _bf_dec_loop1 "set _bf_tmp_$3 _bf_dec_loop2; set _bf_tmp_-$2 _bf_return_3; _bf_vcall _bf_tmp_$3 $*"
+alias _bf_dec_loop2 "set _bf_tmp_$2 _bf_dec_loop3; set _bf_tmp_+$4 _bf_return_4; _bf_vcall _bf_tmp_$2 $*"
+alias _bf_dec_loop3 "_bf_dec_loop1 $1 $2 -$3 +$4"
+alias _bf_dec "set _bf_tmp_$2 _bf_dec_loop1; set _bf_tmp_0 _bf_minus_one; set _bf_tmp_+ _bf_zero; _bf_vcall _bf_tmp_$2 $1 $2 - +"
+// end of unary
+
+// interpreter state
+set bf_input ""
+alias _bf_clearstate "set _bf_left \"\"; set _bf_right \"\"; set _bf_register $_bf_zero; set _bf_execstack \"\""
+alias _bf_dumpstate "echo rev($_bf_left) < $_bf_register > $_bf_right"
+
+// a STACK!
+alias _bf_pop_get "set $2 \"${3 ?}\"; set $1 \"${4- ?}\""
+alias _bf_pop_dispatch "_bf_pop_get $1 $2 $_bf_popstack_"
+// usage: _bf_pop stackvar outvar defaultvalue
+alias _bf_pop "set _bf_popstack_ \"${$1 ?}\"; set \"_bf_popstack_${$1 ?}\" \"${3 ?}\"; _bf_pop_dispatch $*"
+// usage: _bf_push stackvar value
+alias _bf_push "set $1 \"$2 ${$1 ?}\""
+
+// skip mode: skip until matching ] (1 on _bf_execstack), then continue executing
+alias _bf_skip_ "echo PROGRAMM FELL OFF THE EDGE"
+alias _bf_skip_+ "_bf_skip_${* ?}"
+alias _bf_skip_- "_bf_skip_${* ?}"
+alias _bf_skip_< "_bf_skip_${* ?}"
+alias _bf_skip_> "_bf_skip_${* ?}"
+alias _bf_skip_. "_bf_skip_${* ?}"
+alias _bf_skip_, "_bf_skip_${* ?}"
+alias _bf_skip_endloop_0 "_bf_skip_${* ?}" // continue skipping
+alias _bf_skip_endloop_1 "bf_${* ?}" // back to execution
+alias _bf_skip_endloop_dispatch "_bf_skip_endloop_$_bf_stackval ${* ?}"
+alias _bf_skip_] "_bf_pop _bf_execstack _bf_stackval; _bf_skip_endloop_dispatch ${* ?}"
+alias _bf_skip_[ "_bf_push _bf_execstack 0; _bf_skip_${* ?}"
+// enter
+alias _bf_skiploop "_bf_push _bf_execstack 1; _bf_skip_${* ?}"
+
+// run mode: execute until matching ] (1 on _bf_execstack), then exit
+alias bf_ "echo PROGRAMM FELL OFF THE EDGE"
+alias bf_+ "_bf_inc _bf_register $_bf_register; bf_${* ?}"
+alias bf_- "_bf_dec _bf_register $_bf_register; bf_${* ?}"
+alias bf_< "_bf_push _bf_left $_bf_register; _bf_pop _bf_right _bf_register $_bf_zero; bf_${* ?}"
+alias bf_> "_bf_push _bf_right $_bf_register; _bf_pop _bf_left _bf_register $_bf_zero; bf_${* ?}"
+alias bf_. "echo $_bf_register; bf_${* ?}"
+// note: on EOF, we don't change the register value!
+alias _bf_input_get "set _bf_register $_bf_inputval; bf_${* ?}" // read input
+alias _bf_input_eof "bf_${* ?}" // at EOF, just continue
+alias _bf_input_dispatch "set _bf_inputval_ _bf_input_get; set _bf_inputval_$_bf_inputval _bf_input_eof; _bf_vcall _bf_inputval_ ${* ?}"
+alias bf_, "_bf_pop bf_input _bf_inputval; _bf_input_dispatch ${* ?}"
+alias _bf_endloop_0 "echo _bf_endloop_0 WTF?; bf_${* ?}" // continue executing
+alias _bf_endloop_1 "" // back to caller
+alias _bf_endloop_ "echo PROGRAMM FELL OFF THE EDGE" // back to caller
+alias _bf_endloop_dispatch "_bf_endloop_$_bf_stackval ${* ?}"
+alias bf_] "_bf_pop _bf_execstack _bf_stackval; _bf_endloop_dispatch ${* ?}"
+// enter
+alias _bf_runloop "_bf_push _bf_execstack 1; bf_$*; bf_[ ${* ?}"
+// loop dispatcher
+alias bf_[ "set _bf_runloop_$_bf_zero _bf_runloop; set _bf_runloop_$_bf_register _bf_skiploop; _bf_vcall _bf_runloop_$_bf_zero ${* ?}"
+
+// start it
+alias bf_exec "_bf_clearstate; _bf_push _bf_execstack 1; bf_$1 ]"
+
+// "cat"
+// Xon RPN: bf_input "1 2 3 4 5"
+bf_input "+ ++ +++ ++++ +++++"
+bf_exec "[ - ] - , + [ - . + [ - ] - , + ]"
+
+// output 42
+// Xon RPN: bf_input "12 6 9"
+bf_input "++++++++++++ ++++++ +++++++++"
+bf_exec ", > , > , < [ > [ - > + > + < < ] > > [ - < < + > > ] < < < - ] < [ - > > > - < < < ] > > > ."
+
+// hello world
+bf_exec "+ + + + + + + + + + [ > + + + + + + + > + + + + + + + + + + > + + + > + < < < < - ] > + + . > + . + + + + + + + . . + + + . > + + . < < + + + + + + + + + + + + + + + . > . + + + . - - - - - - . - - - - - - - - . > + . > ."