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#!/usr/bin/python
#
# exyapps - yet another python parser system
# Copyright 1999-2003 by Amit J. Patel <amitp@cs.stanford.edu>
# Copyright 2011 by Association of Universities for Research in Astronomy
#
# This software can be distributed under the terms of the MIT
# open source license, either found in the LICENSE file or at
# <http://www.opensource.org/licenses/mit-license.php>
import sys, re
import exyapps.runtime as runtime
import exyapps.parsetree as parsetree
def generate(inputfilename, outputfilename=None, dump=0, **flags):
"""Generate a grammar, given an input filename (X.g)
and an output filename (defaulting to X.py)."""
if not outputfilename:
# recognize *.g because that is what the old yapps used
if inputfilename.endswith('.g'):
outputfilename = inputfilename[:-2] + '.py'
# recognize *.exy for the new grammar
elif inputfilename.endswith('.exy'):
outputfilename = inputfilename[:-4] + '.py'
# cannot automatically generate the output file name if we don't recognize extension
else:
raise Exception('Must specify output filename if input filename is not *.exy or *.g')
DIVIDER = '\n%%\n' # This pattern separates the pre/post parsers
preparser, postparser = None, None # Code before and after the parser desc
# Read the entire file
s = open(inputfilename,'r').read()
# See if there's a separation between the pre-parser and parser
f = s.find(DIVIDER)
if f >= 0:
preparser, s = s[:f]+'\n\n', s[f+len(DIVIDER):]
# See if there's a separation between the parser and post-parser
f = s.find(DIVIDER)
if f >= 0:
s, postparser = s[:f], '\n\n'+s[f+len(DIVIDER):]
# Create the parser and scanner and parse the text
scanner = grammar.ParserDescriptionScanner(s, filename=inputfilename)
if preparser:
scanner.del_line += preparser.count('\n')
parser = grammar.ParserDescription(scanner)
t = runtime.wrap_error_reporter(parser, 'Parser')
if t is None:
return 1 # Failure
if preparser is not None:
t.preparser = preparser
if postparser is not None:
t.postparser = postparser
# Check the options
for f in t.options.keys():
for opt,_,_ in yapps_options:
if f == opt:
break
else:
print('Warning: unrecognized option', f, file=sys.stderr)
# Add command line options to the set
for f in flags.keys():
t.options[f] = flags[f]
# Generate the output
if dump:
t.dump_information()
else:
t.output = open(outputfilename, 'w')
t.generate_output()
return 0
def main() :
import doctest
doctest.testmod(sys.modules['__main__'])
doctest.testmod(parsetree)
# Someday I will use optparse, but Python 2.3 is too new at the moment.
yapps_options = [
('context-insensitive-scanner',
'context-insensitive-scanner',
'Scan all tokens (see docs)'),
]
import getopt
optlist, args = getopt.getopt(sys.argv[1:], 'f:', ['help', 'dump', 'use-devel-grammar'])
if not args or len(args) > 2:
print('Usage:', file=sys.stderr)
print(' python', sys.argv[0], '[flags] input.g [output.py]', file=sys.stderr)
print('Flags:', file=sys.stderr)
print((' --dump' + ' '*40)[:35] + 'Dump out grammar information', file=sys.stderr)
print((' --use-devel-grammar' + ' '*40)[:35] + 'Use the devel grammar parser from yapps_grammar.py instead of the stable grammar from grammar.py', file=sys.stderr)
for flag, _, doc in yapps_options:
print((' -f' + flag + ' '*40)[:35] + doc, file=sys.stderr)
return 1
else:
# Read in the options and create a list of flags
flags = {}
use_devel_grammar = 0
for opt in optlist:
for flag, name, _ in yapps_options:
if opt == ('-f', flag):
flags[name] = 1
break
else:
if opt == ('--dump', ''):
flags['dump'] = 1
elif opt == ('--use-devel-grammar', ''):
use_devel_grammar = 1
else:
print('Warning: unrecognized option', opt[0], opt[1], file=sys.stderr)
if use_devel_grammar:
import yapps_grammar as g2
else:
import exyapps.grammar as g2
global grammar
grammar = g2
return generate(*tuple(args), **flags)
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