54 lines
1.2 KiB
Python
54 lines
1.2 KiB
Python
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#!/usr/local/bin/python
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# yply.py
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#
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# Author: David Beazley (dave@dabeaz.com)
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# Date : October 2, 2006
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#
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# Converts a UNIX-yacc specification file into a PLY-compatible
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# specification. To use, simply do this:
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#
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# % python yply.py [-nocode] inputfile.y >myparser.py
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#
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# The output of this program is Python code. In the output,
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# any C code in the original file is included, but is commented.
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# If you use the -nocode option, then all of the C code in the
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# original file is discarded.
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#
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# Disclaimer: This just an example I threw together in an afternoon.
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# It might have some bugs. However, it worked when I tried it on
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# a yacc-specified C++ parser containing 442 rules and 855 parsing
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# states.
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#
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import sys
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sys.path.insert(0,"../..")
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import ylex
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import yparse
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from ply import *
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if len(sys.argv) == 1:
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print "usage : yply.py [-nocode] inputfile"
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raise SystemExit
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if len(sys.argv) == 3:
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if sys.argv[1] == '-nocode':
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yparse.emit_code = 0
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else:
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print "Unknown option '%s'" % sys.argv[1]
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raise SystemExit
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filename = sys.argv[2]
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else:
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filename = sys.argv[1]
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yacc.parse(open(filename).read())
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print """
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if __name__ == '__main__':
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from ply import *
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yacc.yacc()
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"""
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