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-rwxr-xr-x[-rw-r--r--]bytetunes.py12
-rw-r--r--expr.py111
-rw-r--r--notes.txt3
3 files changed, 110 insertions, 16 deletions
diff --git a/bytetunes.py b/bytetunes.py
index 1d2a8a7..8ed9641 100644..100755
--- a/bytetunes.py
+++ b/bytetunes.py
@@ -1,17 +1,25 @@
+#!/usr/bin/env python
from expr import *
import sys
def play(s):
- machine = parse(preparse(tokenize(s))[0])
+ machine = parse(preparse(tokenize(s)))
t = 0
while True:
t += 1
sys.stdout.write(chr(execute(machine, t) & 0x000000FF))
def main():
- play("(t>>6)&(2*t)&(t>>1)")
+ if len(sys.argv) <= 1:
+ play("(t>>6)&(2*t)&(t>>1)")
+ elif sys.argv[1] == '--test':
+ test_tokenize()
+ test_preparse()
+ test_parse()
+ else:
+ play(sys.argv[1])
if __name__=='__main__':
main()
diff --git a/expr.py b/expr.py
index 00435e9..0336ddd 100644
--- a/expr.py
+++ b/expr.py
@@ -45,7 +45,10 @@ def car(l):
def cdr(l):
return l[1:]
-def preparse(l, depth=0):
+def preparse(l):
+ return preparseh(l)[0]
+
+def preparseh(l, depth=0):
"""
match parens and set types
"""
@@ -53,11 +56,14 @@ def preparse(l, depth=0):
for i in range(len(l)):
if l[i] == '(':
#print "%sleft: %s" % (" "*depth, ret)
- middle, remains = preparse(l[i+1:], depth+1)
+ middle, remains = preparseh(l[i+1:], depth+1)
#print "%smiddle: %s" % (" "*depth, middle)
- right, moreright = preparse(remains, depth)
+ right, moreright = preparseh(remains, depth)
#print "%sright: %s" % (" "*depth, right)
- return ret + [tuple(cons('PARENS', middle))] + right, moreright
+ if middle:
+ return ret + [tuple(cons('PARENS', middle))] + right, moreright
+ else:
+ return ret + right, moreright
elif l[i] == ')':
if depth == 0:
Exception("preparse: unexpected parens")
@@ -77,35 +83,44 @@ def preparse(l, depth=0):
raise Exception("preparse: unmatched parens")
return ret, []
+def lastindex(l, item):
+ for i in range(len(l)-1, -1, -1):
+ if l[i] == item:
+ return i
+ return -1
+
def parse(l):
#print l
if not l or len(l) == 0:
- return []
+ return tuple()
if len(l) == 1:
if car(car(l)) in ('VAR', 'NUM'):
return ('ATOM', car(l))
elif car(car(l)) == 'PARENS':
return parse(cdr(car(l)))
+ elif car(car(l)) == 'NOT':
+ # special case of NOT-NOT; already parsed
+ return l[0]
else:
raise Exception("parse error: %s" % l)
# ~ has highest priority
if ('NOTOPER',) in l:
- i = l.index(('NOTOPER',))
+ i = lastindex(l, ('NOTOPER',))
if i == len(l)-1:
raise Exception("parse error: trailing ~")
- return parse(l[:i] + ('NOT', parse(l[i+1])) + l[i+2:])
+ return parse(l[:i] + [('NOT', parse([l[i+1]]))] + l[i+2:])
# helper function
def hunt_opers(l, operlist):
for i in range(1, len(l) - 1):
if car(l[i]) == 'OPER' and l[i][1] in operlist:
left = parse(l[:i])
right = parse(l[i+1:])
- if not car(left) in ['ATOM', 'BINARY', 'NOT']:
+ if not left[0] in ['ATOM', 'BINARY', 'NOT']:
raise Exception("parse error: not a binary operand: %s" %
- left)
- if not car(right) in ['ATOM', 'BINARY', 'NOT']:
+ str(left))
+ if not right[0] in ['ATOM', 'BINARY', 'NOT']:
raise Exception("parse error: not a binary operand: %s" %
- right)
+ str(right))
return ('BINARY', l[i][1], left, right)
for operlist in binaryoper_priority:
match = hunt_opers(l, operlist)
@@ -125,8 +140,6 @@ def schemify(ast):
def test_parse():
"""
- ()
- ~~1
"""
def tokenize(s):
@@ -162,6 +175,9 @@ def tokenize(s):
raise Exception("tokenization error: %s" % s)
def execute(ast, t):
+ if ast == tuple():
+ # null machine evals to 0; machine should have no null sub-expressions
+ return 0
if car(ast) == 'ATOM':
if car(ast[1]) == 'VAR':
return t
@@ -196,9 +212,75 @@ def execute(ast, t):
return left & right
raise Exception("execute: unexpected node: %s" % car(ast))
-
+def strmachine(ast):
+ if ast == tuple():
+ return ""
+ if car(ast) == 'ATOM':
+ if car(ast[1]) == 'VAR':
+ return "t"
+ if car(ast[1]) == 'NUM':
+ return "%d" % ast[1][1]
+ elif car(ast) == 'NOT':
+ return "(~ %s)" % strmachine(ast[1])
+ elif car(ast) == 'BINARY':
+ # UGH
+ oper, left, right = ast[1:4]
+ left = strmachine(ast[2])
+ right = strmachine(ast[3])
+ oper = oper.replace('r','>>').replace('l','<<')
+ return "(%s %s %s)" % (oper, left, right)
+ raise Exception("execute: unexpected node: %s" % car(ast))
+
# ==============================
+def test_preparse():
+ """
+ 0
+ ()()()()()()
+ (((((())))))
+ (1 + (2 >> 3) / 5)
+ """
+ print "------ test_preparse"
+ assert preparse(tokenize("0")) == [('NUM', 0)]
+ assert preparse(tokenize("()()()()()()")) == []
+ assert preparse(tokenize("(((((())))))")) == []
+ assert preparse(tokenize("(1 + (2 >> 3) / 5)")) == \
+ [('PARENS', ('NUM', 1), ('OPER', '+'), ('PARENS', ('NUM', 2), ('OPER', 'r'), ('NUM', 3)), ('OPER', '/'), ('NUM', 5))]
+ print "\tall passed!"
+
+def test_parse():
+ """
+ 0
+ ()
+ ~~1
+ 1 + 2 * 3 ^ 5 | 6 & 7 >> 8 + ~ 9
+ 1 + ~ 3
+ anti: 1 (+ 3)
+ """
+ print "------ test_parse"
+ assert parse(preparse(tokenize("()"))) == tuple()
+ assert parse(preparse(tokenize("0"))) == ('ATOM', ('NUM', 0))
+ assert parse(preparse(tokenize("~1"))) == ('NOT', ('ATOM', ('NUM', 1)))
+ assert parse(preparse(tokenize("~~1"))) == ('NOT', ('NOT', ('ATOM', ('NUM', 1))))
+ assert parse(preparse(tokenize("~~t"))) == ('NOT', ('NOT', ('ATOM', ('VAR',))))
+ assert parse(preparse(tokenize("1<<1"))) == \
+ ('BINARY', 'l', ('ATOM', ('NUM', 1)), ('ATOM', ('NUM', 1)))
+ assert parse(preparse(tokenize("1^1"))) == \
+ ('BINARY', '^', ('ATOM', ('NUM', 1)), ('ATOM', ('NUM', 1)))
+ assert parse(preparse(tokenize("1 + ~ 3"))) == \
+ ('BINARY', '+', ('ATOM', ('NUM', 1)), ('NOT', ('ATOM', ('NUM', 3))))
+ try:
+ assert parse(preparse(tokenize("1 (+ 3)"))) == "SHOULD FAIL"
+ except:
+ pass
+ try:
+ assert parse(preparse(tokenize("1 ~"))) == "SHOULD FAIL"
+ except:
+ pass
+ assert strmachine(parse(preparse(tokenize("1 + 2 * 3 ^ 5 | 6 & 7 >> 8 + ~ 9")))) == \
+ "(| (^ (+ 1 (* 2 3)) 5) (& 6 (>> 7 (+ 8 (~ 9)))))"
+
def test_tokenize():
+ print "------ test_tokenize"
assert tokenize("(t>>4)") == ['(','t','r',4,')']
assert tokenize("t") == ['t']
assert tokenize("i") == ['t']
@@ -232,4 +314,5 @@ def test_tokenize():
assert tokenize("x123") is "TOKENIZE ERROR"
except:
pass
+ print "\tall passed!"
diff --git a/notes.txt b/notes.txt
index 80773b8..102da5a 100644
--- a/notes.txt
+++ b/notes.txt
@@ -29,6 +29,9 @@ bytetros?
original (to me):
echo "main(i){for(i=0;;i++)putchar((i*(i>>8|i>>9)&46&i>>8)^(i&i>>13|i>>6));}" | gcc -x c - && ./a.out | aplay
+favorite:
+ (t*9&t>>4|t*5&t>>7|t*3&t/1024)-1
+
from http://countercomplex.blogspot.de/2011/10/algorithmic-symphonies-from-one-line-of.html
main(t){for(t=0;;t++)putchar(t*(((t>>12)|(t>>8))&(63&(t>>4))));}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-21 12:19:47 +0000