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1 #!/usr/local/bin/python
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2 # yply.py
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3 #
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4 # Author: David Beazley (dave@dabeaz.com)
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5 # Date : October 2, 2006
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6 #
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7 # Converts a UNIX-yacc specification file into a PLY-compatible
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8 # specification. To use, simply do this:
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9 #
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10 # % python yply.py [-nocode] inputfile.y >myparser.py
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11 #
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12 # The output of this program is Python code. In the output,
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13 # any C code in the original file is included, but is commented.
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14 # If you use the -nocode option, then all of the C code in the
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15 # original file is discarded.
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16 #
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17 # Disclaimer: This just an example I threw together in an afternoon.
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18 # It might have some bugs. However, it worked when I tried it on
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19 # a yacc-specified C++ parser containing 442 rules and 855 parsing
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20 # states.
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21 #
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22
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23 import sys
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24 sys.path.insert(0,"../..")
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25
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26 import ylex
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27 import yparse
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28
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29 from ply import *
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30
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31 if len(sys.argv) == 1:
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32 print "usage : yply.py [-nocode] inputfile"
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33 raise SystemExit
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34
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35 if len(sys.argv) == 3:
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36 if sys.argv[1] == '-nocode':
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37 yparse.emit_code = 0
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38 else:
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39 print "Unknown option '%s'" % sys.argv[1]
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40 raise SystemExit
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41 filename = sys.argv[2]
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42 else:
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43 filename = sys.argv[1]
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44
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45 yacc.parse(open(filename).read())
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46
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47 print """
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48 if __name__ == '__main__':
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49 from ply import *
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50 yacc.yacc()
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51 """
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52
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53
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