54 lines
1.2 KiB
Python
54 lines
1.2 KiB
Python
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#!/usr/bin/python
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import re
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RE_RULE = re.compile(r'^(.*) => (.*)$')
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def read_file(filename):
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file = open(filename, 'r')
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while True:
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line = file.readline()
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if not line:
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break
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yield line.strip()
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def apply_rule(formula, key, value):
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keyLen = len(key)
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formulaPos = 0
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# print "formula: %s, key: %s, value: %s" % (formula, key, value)
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while True:
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pos = formula.find(key, formulaPos)
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# print " - pos: %d" % (pos)
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if pos < 0:
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break
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yield formula[0:pos] + value + formula[pos+keyLen:]
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formulaPos = pos + keyLen
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def main():
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formula = ""
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rules = dict()
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for line in read_file('input'):
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# skip empty lines
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if not line:
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continue
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match = re.match(RE_RULE, line)
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if match:
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if match.group(1) not in rules:
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rules[match.group(1)] = []
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rules[match.group(1)].append(match.group(2))
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else:
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formula = line
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for k1, v1 in rules.iteritems():
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for v2 in v1:
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for r in apply_rule(formula, k1, v2):
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print r
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if __name__ == "__main__":
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main()
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