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125 lines
3.6 KiB
Python
Executable file
125 lines
3.6 KiB
Python
Executable file
#!/usr/bin/env python3
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"""
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Markov chain simulation of words or characters.
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"""
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class Markov:
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def __init__(self, histsize, choice):
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self.histsize = histsize
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self.choice = choice
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self.trans = {}
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def add(self, state, next):
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self.trans.setdefault(state, []).append(next)
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def put(self, seq):
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n = self.histsize
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add = self.add
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add(None, seq[:0])
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for i in range(len(seq)):
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add(seq[max(0, i-n):i], seq[i:i+1])
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add(seq[len(seq)-n:], None)
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def get(self):
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choice = self.choice
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trans = self.trans
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n = self.histsize
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seq = choice(trans[None])
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while True:
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subseq = seq[max(0, len(seq)-n):]
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options = trans[subseq]
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next = choice(options)
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if not next:
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break
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seq += next
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return seq
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def test():
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import sys, random, getopt
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args = sys.argv[1:]
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try:
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opts, args = getopt.getopt(args, '0123456789cdwq')
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except getopt.error:
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print('Usage: %s [-#] [-cddqw] [file] ...' % sys.argv[0])
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print('Options:')
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print('-#: 1-digit history size (default 2)')
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print('-c: characters (default)')
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print('-w: words')
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print('-d: more debugging output')
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print('-q: no debugging output')
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print('Input files (default stdin) are split in paragraphs')
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print('separated blank lines and each paragraph is split')
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print('in words by whitespace, then reconcatenated with')
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print('exactly one space separating words.')
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print('Output consists of paragraphs separated by blank')
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print('lines, where lines are no longer than 72 characters.')
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sys.exit(2)
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histsize = 2
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do_words = False
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debug = 1
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for o, a in opts:
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if '-0' <= o <= '-9': histsize = int(o[1:])
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if o == '-c': do_words = False
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if o == '-d': debug += 1
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if o == '-q': debug = 0
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if o == '-w': do_words = True
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if not args:
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args = ['-']
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m = Markov(histsize, random.choice)
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try:
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for filename in args:
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if filename == '-':
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f = sys.stdin
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if f.isatty():
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print('Sorry, need stdin from file')
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continue
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else:
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f = open(filename, 'r')
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with f:
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if debug: print('processing', filename, '...')
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text = f.read()
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paralist = text.split('\n\n')
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for para in paralist:
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if debug > 1: print('feeding ...')
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words = para.split()
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if words:
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if do_words:
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data = tuple(words)
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else:
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data = ' '.join(words)
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m.put(data)
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except KeyboardInterrupt:
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print('Interrupted -- continue with data read so far')
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if not m.trans:
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print('No valid input files')
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return
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if debug: print('done.')
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if debug > 1:
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for key in m.trans.keys():
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if key is None or len(key) < histsize:
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print(repr(key), m.trans[key])
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if histsize == 0: print(repr(''), m.trans[''])
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print()
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while True:
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data = m.get()
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if do_words:
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words = data
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else:
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words = data.split()
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n = 0
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limit = 72
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for w in words:
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if n + len(w) > limit:
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print()
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n = 0
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print(w, end=' ')
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n += len(w) + 1
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print()
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print()
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if __name__ == "__main__":
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test()
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