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executable file
·333 lines (288 loc) · 9.4 KB
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#!/usr/bin/python
# Process lines from stdin with python functions
# Functions are either predefined or user supplied,
# the latter being similar to perl -n -e 'expression'.
# Update June 9 2009, I noticed a similar script called pyline:
# http://code.activestate.com/recipes/437932/
# Author:
# http://www.pixelbeat.org/
# Notes:
# This util uses python's functional attributes to be:
# 1. scalable (don't build lists in mem so arbitrary length input supported)
# 2. efficient (as many operations done in compiled code as possible)
# Changes:
# V1.0, 01 Nov 2006, Initial release
# V1.1, 30 Nov 2007, Added 'uniq' (example of many to many)
# V1.6, 11 Jul 2011, http://github.com/pixelb/scripts/commits/master/scripts/funcpy
# Examples:
#
# add numbers
# echo -e "1234\n433" | ./funcpy add
#
# The rest of the examples use user supplied expressions
# (where the input line is represented by x)
#
# transform numbers
# echo -e "1234\n433" | ./funcpy "hex(int(x))[2:]"
#
# operate on single column
# echo "1,2,3" | ./funcpy "int(x.split(',')[1])**2"
#
# reiterate over sub items (only reducable functions)
# echo "1,2,3" | ./funcpy "add(int(i) for i in x.split(','))"
#
# swartzian transform (to sort by line len) (note sort not as efficient or scalable as max)
# ls | ./funcpy "str(len(x))+'\t'+x" | sort -k1,1n | cut -f2
#
# filtering input (odd numbers) (note "or None" at end)
# echo -e "1\n2\n3" | ./funcpy "int(x)%2 and x or None"
#
# formating with printf
# echo "12341234.432142" | ./funcpy '"%g" % float(x)'
#
# arbitrary modules
# ls | ./funcpy --import=base64 "base64.encodestring(x)[:-1]"
#
# similar to perl
# echo -e "1\n5" | perl -n -e 'print $_**2,"\n"'
import itertools
import operator
import math
import sys
used_compiled=True #Turn off for comparison
#is swartzian transform functional?
#can we add reducable decorator to functions?
#TODO: allow option=expression to filter input if true rather than and or hack?
#TODO: put human() in here?
def reduce(func, items, start=None): #foldl
try:
items=iter(items)
except:
raise TypeError("reduce() arg 2 must support iteration")
if start==None:
try:
state=items.next()
except StopIteration:
raise TypeError("reduce() of empty sequence with no initial value")
else:
state=start
for i in items:
state = func(state,i)
return state
if used_compiled:
try: #builtin removed in python 3.0
reduce=__builtins__.reduce
except: #here in python 2.6, only here in python 3.0
import functools
reduce=functools.reduce
def imap(func, iter):
for i in iter:
yield func(i)
if used_compiled:
if sys.version_info < (3,):
imap=itertools.imap
else:
imap=map
def izip(iter1, iter2):
for i in iter1:
yield (i, iter2.next()) #exception raised if either exhausted as required
if used_compiled:
if sys.version_info < (3,):
izip=itertools.izip
else:
izip=zip
def irange(*args):
start=0
step=1
if len(args) == 0:
raise TypeError("irange expected at least 1 argument, got 0")
elif len(args) == 1:
(stop,) = args
elif len(args) == 2:
(start,stop) = args
elif len(args) == 3:
(start,stop,step) = args
else:
raise TypeError("irange expected at most 3 arguments, got %d" % len(args))
while start < stop:
yield start
start += step
if used_compiled:
if sys.version_info < (3,):
irange=xrange
else:
irange=range
def all(iter): #every?
return False not in imap(bool,iter)
def any(iter): #some?
return True in imap(bool,iter)
if used_compiled:
try: # any() and all() are available since python 2.5
all=__builtins__.all
any=__builtins__.any
except:
pass
def factorial(x):
return reduce(operator.mul, irange(1,int(x)+1))
def add(iter):
return reduce(operator.add, iter)
if used_compiled:
add=__builtins__.sum #should be slightly more specific (faster)
def head(iterator, n=10):
return (x for x,i in izip(iterator, irange(n)))
# Note the following more general inspector
# return itertools.islice(iterator,n)
#def tail(iterator, n=10):
# import collections
# return collections.deque(iterator, maxlen=n)
def count(iterator):
return add(1 for x in iterator)
def uniq(iterator):
state=None
for line in iterator:
if line != state:
yield line
state=line
# Using the groupby equivalent is slightly slower:
# return (k for k, g in itertools.groupby(iterator))
def uniq_c(iterator):
return ("%7d %s" % (count(g), k)
for k, g in itertools.groupby(iterator))
def uniq_d(iterator):
return (k for k, g in itertools.groupby(iterator) if count(head(g,2)) > 1)
def min(iter):
state=None
for i in iter:
if state > i: state=i
return state
if used_compiled:
min=__builtins__.min
def max(iter):
state=None
for i in iter:
if i > state: state=i
return state
if used_compiled:
max=__builtins__.max
def avg(iterator):
try:
# Note math.fsum (available since 2.6) doesn't lose precision
# while adding lots of small numbers
iter1, iter2 = itertools.tee(iterator)
return math.fsum(iter1)/count(iter2)
except:
total=0
lenth=0
for i in iterator:
total+=i
length+=1
return total/length
def dec2hex(i):
return __builtins__.hex(int(i))[2:]
def hex2dec(i):
return int(i,16)
def bits(i):
if i<0: raise ValueError("negative number [%d]" % i)
if i==0: return 1
#shift operator slower
return int(math.log(i,2))+1
#=============================================================
import os, errno
# The following exits cleanly on Ctrl-C or EPIPE
# while treating other exceptions as before.
def std_exceptions(etype, value, tb):
sys.excepthook=sys.__excepthook__
if issubclass(etype, KeyboardInterrupt):
pass
elif issubclass(etype, IOError) and value.errno == errno.EPIPE:
pass
else:
sys.__excepthook__(etype, value, tb)
sys.excepthook=std_exceptions
functions={
#name: (func, input, type)
'add': (add, float, 'mto1'),
'max': (max, float, 'mto1'),
'min': (min, float, 'mto1'),
'avg': (avg, float, 'mto1'),
'all': (all, float, 'mto1'),
'any': (any, float, 'mto1'),
'count': (count, str, 'mto1'),
'head': (head, str, 'mtom'),
'uniq': (uniq, str, 'mtom'),
'uniq_c': (uniq_c, str, 'mtom'),
'uniq_d': (uniq_d, str, 'mtom'),
#Following really of minimal use
#'dec2hex': (dec2hex, str, '1to1'),
#'hex2dec': (hex2dec, str, '1to1'),
#'factorial': (factorial, int, '1to1'),
#'log10': (math.log10, float, '1to1'),
#'bits': (bits, long, '1to1'),
}
def Usage():
sys.stderr.write("Usage: " + os.path.split(sys.argv[0])[1] + " [OPTIONS] <" + '|'.join(sorted(functions.keys())) + ">\n")
sys.stderr.write(" " + os.path.split(sys.argv[0])[1] + " [OPTIONS] <" + "python expression where input is x>\n")
sys.stderr.write("Input is taken from stdin, and is processed per line\n")
sys.stderr.write("Note python expressions must be stateless (no ifs or assigments)\n")
sys.stderr.write(" --imports=mod1,mod2,... modules to import for use in python expression\n")
sys.stderr.write(" --help display this help\n")
sys.stderr.close()
sys.exit(1)
import getopt
try:
lOpts, lArgs = getopt.getopt(sys.argv[1:], "", ["help","imports="])
if len(lArgs) == 1:
mode=lArgs[0]
else:
Usage()
sys.exit(1)
if ("--help","") in lOpts:
Usage()
sys.exit(None)
for opt in lOpts:
if opt[0] == "--imports":
for mod in opt[1].split(","):
globals()[mod]=__import__(mod)
except getopt.error:
msg = sys.exc_info()[1]
sys.stdout.write("%s\n" % msg)
Usage()
sys.exit(2)
#=============================================================
try:
func=functions[mode][0]
conv=functions[mode][1]
ftype=functions[mode][2]
except:
#shows the flexibility of interpretation over compilation
code=compile(mode,"<expression>","eval")
func=lambda x: eval(code)
conv=lambda x: x[-1]=='\n' and x[:-1] or x #strip EOL
ftype='1to1'
def convert(iterator):
if conv==str: #shortcut for speed
return iterator
else:
return (conv(line) for line in iterator)
try:
if ftype=='mto1': #many to one
result = func(convert(sys.stdin))
if type(result)==bool:
sys.exit(not result)
else:
sys.stdout.write("%s\n" % result)
elif ftype=='mtom': #many to many
#for result in func(convert(sys.stdin)):
# sys.stdout.write(result)
#note the following is faster but it buffers output
#even if stdout is a terminal. writelines really shouldn't do that.
sys.stdout.writelines(func(convert(sys.stdin)))
else: #one to one
for num in convert(sys.stdin):
result = func(num)
if result!=None:
sys.stdout.write("%s\n" % result)
except ValueError:
value = sys.exc_info()[1]
sys.stderr.write(str(value)+"\n")
sys.exit(1)
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