--- /dev/null
+#!@PYTHON@
+#
+# yyout2grammar.py
+
+# This file is part of LilyPond, the GNU music typesetter.
+#
+# Copyright (C) 2005 by Carl D. Sorensen <c_sorensen@byu.edu>
+#
+# LilyPond is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# LilyPond is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
+
+
+# Convert from bison output file parser.output to
+# Grammar and index.
+# Drops all of the state information.
+# Converts \\ to \
+# Eliminates the @ variables created when {} is placed
+# in the middle of a rule
+# Eliminates all of the c-code stuff
+# Wraps lines that are longer than 78 characters for improved
+# formatting
+#
+# to create input file, run
+# bison -v parser.yy
+# this will create a file parser.output
+# then run
+# yyout2grammar.py parser.output your_output_file
+#
+
+import sys
+import re
+
+atre = re.compile('(@\d+):')
+
+intro_re = re.compile (r'(.*[:|])\s')
+keyword_re = re.compile (r'(\S+)\s')
+
+# strip extra backslashes that are inserted by the python
+# string handling routines
+def strip_backslash(input_string):
+ i=input_string.find(r'"\\')
+ while i > -1 :
+ input_string = input_string[:i+1]+input_string[i+2:]
+ i = input_string.find(r'"\\')
+ return input_string
+
+# write an output line, adjusting to make sure that max_line_length
+# is not exceeded
+def write_line (output_line, output_file):
+ max_line_length = 78
+ indent_value = 3
+ if len(output_line) > max_line_length:
+ intro = intro_re.match(output_line)
+ if intro:
+ output_file.write(intro.group(1)+" ")
+ indent_column = len(intro.group(1))
+ output_line = output_line[indent_column:]
+ keyword = keyword_re.search(output_line)
+ while keyword:
+ output_file.write(strip_backslash(keyword.group(1))+" \n")
+ output_line = output_line[keyword.end(1):]
+ keyword = keyword_re.search(output_line)
+ if keyword:
+ output_file.write("".rjust(indent_column + indent_value))
+ else:
+ output_file.write(strip_backslash(output_line))
+ return
+
+write_me = True
+
+if len(sys.argv)!=3:
+ print "Usage: yyout2grammar.py parser_output_file grammar_file."
+else:
+ in_name = sys.argv[1]
+ out_name = sys.argv[2]
+
+ print "input file name",in_name
+ print "output file name",out_name
+ in_file = open(in_name,'r')
+ out_file= open(out_name, 'w')
+
+ at_items=[]
+ inline = in_file.readline()
+
+ ## skip header material from file
+ while inline != '' and not(inline.startswith("Grammar")):
+ inline = in_file.readline()
+
+ ## process the Grammar lines
+ if inline != '':
+ write_line(inline, out_file)
+ inline = in_file.readline()
+ while inline != '' and not(inline.startswith("Terminals")):
+ i = inline.find("$accept:")
+ if i>-1:
+ write_me = False
+ inline = in_file.readline()
+ atfound = re.findall(atre,inline)
+ if len(atfound) > 0:
+ at_items.extend(atfound)
+ # print at_items
+ write_me = False
+ inline=in_file.readline()
+ else:
+ for at_item in at_items:
+ i=inline.find(at_item)
+ ## remove @ item
+ if i >= 0:
+ inline=inline[:i] + inline[i+len(at_item):]
+
+ if write_me:
+ write_line(inline, out_file)
+ inline = in_file.readline()
+ write_me = True
+ index_items = []
+
+ # Write the Terminals header line and the following blank line
+ write_line(inline, out_file)
+ inline = in_file.readline()
+ write_line(inline, out_file)
+ inline = in_file.readline()
+ while inline != '' and not(inline.startswith("Nonterminals")):
+ i=inline.find('"\\\\')
+ while i > -1 :
+ inline = inline[:i+1]+inline[i+2:]
+ i = inline.find('"\\\\')
+ index_items.append(inline)
+ inline = in_file.readline()
+ index_items.sort(lambda x,y:cmp(x.lower(),y.lower()))
+ for index_item in index_items:
+ write_line (index_item, out_file)
+ write_line ('\n', out_file)
+
+ # Write the Nonterminals header and the blank line
+ write_line(inline, out_file)
+ inline = in_file.readline()
+ write_line(inline, out_file)
+ index_items = []
+ index_item=in_file.readline()
+ inline=in_file.readline()
+ while inline != '' and not(inline.startswith("state")):
+ while inline.startswith(" "):
+ index_item = index_item + inline
+ inline = in_file.readline()
+ if not(index_item.startswith("@")) and \
+ not(index_item.startswith("$accept")):
+ index_items.append(index_item)
+ index_item = inline
+ inline=in_file.readline()
+ index_items.sort(lambda x,y:cmp(x.lower(),y.lower()))
+ for index_item in index_items:
+ write_line (index_item, out_file)
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