PNLC

A toy functional language

PNLC is λ‑calculus in prefix notation plus normal-order semantics plus continuation-based I/O plus a small prelude.

<term> ::= "." <term> <term> ; application
         | "\\" <var> <term> ; abstraction
         | <var>             ; variable

Top-Level Term	Effect
$exit	Terminate the program normally.
$err …	Ignore any arguments, crash the program.
.$get cont	Read one bit from stdin, invoke cont with it. \s \n n means EOF, \s \n .s \t \f t means one, \s \n .s \t \f f means zero.
..$put bit cont	Write bit to stdout, invoke cont without arguments. A bit of \t \f t means one, \t \f f means zero.
..$eput bit cont	Write bit to stderr, invoke cont without arguments. A bit of \t \f t means one, \t \f f means zero.
..$dump term cont	Reduce term to weak head normal form, dump it to stderr, invoke cont without arguments.

To run some example programs:

make bin/pnlc
bin/pnlc examples/no-op.pnlc
bin/pnlc examples/raw-cat.pnlc
bin/pnlc prelude.pnlc examples/bit-cat.pnlc
bin/pnlc prelude.pnlc examples/chr-cat.pnlc
bin/pnlc prelude.pnlc examples/greeting.pnlc
bin/pnlc prelude.pnlc examples/truth-machine.pnlc
bin/pnlc prelude.pnlc examples/reverse.pnlc
bin/pnlc prelude.pnlc examples/rot13.pnlc
bin/pnlc prelude.pnlc examples/quine.pnlc
bin/pnlc io\ hook.pnlc prelude.pnlc examples/bit-cat.pnlc
bin/pnlc prelude.pnlc examples/brainfuck.pnlc

Some demos of the Brainfuck interpreter:

cat examples/bf/pnlc.bf | bin/pnlc prelude.pnlc examples/brainfuck.pnlc
cat examples/bf/bell.bf | bin/pnlc prelude.pnlc examples/brainfuck.pnlc
cat examples/bf/ascii.bf | bin/pnlc prelude.pnlc examples/brainfuck.pnlc
cat examples/bf/cat.bf bang - | bin/pnlc prelude.pnlc examples/brainfuck.pnlc
cat examples/bf/reverse.bf bang - | bin/pnlc prelude.pnlc examples/brainfuck.pnlc
cat examples/bf/beaver.bf | bin/pnlc prelude.pnlc examples/brainfuck.pnlc
cat examples/bf/clear.bf | bin/pnlc prelude.pnlc examples/brainfuck.pnlc
cat examples/bf/head.bf bang - | bin/pnlc prelude.pnlc examples/brainfuck.pnlc
cat examples/bf/strip.bf bang - | bin/pnlc prelude.pnlc examples/brainfuck.pnlc
cat examples/bf/truth-machine.bf bang - | bin/pnlc prelude.pnlc examples/brainfuck.pnlc
cat examples/bf/bin2text.bf bang - | bin/pnlc prelude.pnlc examples/brainfuck.pnlc
cat examples/bf/text2bf.bf bang - | bin/pnlc prelude.pnlc examples/brainfuck.pnlc
cat examples/bf/fib.bf | bin/pnlc prelude.pnlc examples/brainfuck.pnlc
cat examples/bf/squares.bf | bin/pnlc prelude.pnlc examples/brainfuck.pnlc
cat examples/bf/thuemorse.bf | bin/pnlc prelude.pnlc examples/brainfuck.pnlc
cat examples/bf/sierpinski.bf | bin/pnlc prelude.pnlc examples/brainfuck.pnlc
cat examples/bf/siercarpet.bf | bin/pnlc prelude.pnlc examples/brainfuck.pnlc