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view ply-3.8/build/lib.linux-x86_64-2.7/ply/ygen.py @ 9610:3b572502ce53
<oerjan> learn Dragons are fractal creatures of magic, capable of shrinking or expanding to any size. Taneb invented them to live inside his string diagrams, but they prefer to hover around pinheads and feed on angels.
author | HackBot |
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date | Wed, 02 Nov 2016 23:36:25 +0000 |
parents | a1845676eaa0 |
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# ply: ygen.py # # This is a support program that auto-generates different versions of the YACC parsing # function with different features removed for the purposes of performance. # # Users should edit the method LParser.parsedebug() in yacc.py. The source code # for that method is then used to create the other methods. See the comments in # yacc.py for further details. import os.path import shutil def get_source_range(lines, tag): srclines = enumerate(lines) start_tag = '#--! %s-start' % tag end_tag = '#--! %s-end' % tag for start_index, line in srclines: if line.strip().startswith(start_tag): break for end_index, line in srclines: if line.strip().endswith(end_tag): break return (start_index + 1, end_index) def filter_section(lines, tag): filtered_lines = [] include = True tag_text = '#--! %s' % tag for line in lines: if line.strip().startswith(tag_text): include = not include elif include: filtered_lines.append(line) return filtered_lines def main(): dirname = os.path.dirname(__file__) shutil.copy2(os.path.join(dirname, 'yacc.py'), os.path.join(dirname, 'yacc.py.bak')) with open(os.path.join(dirname, 'yacc.py'), 'r') as f: lines = f.readlines() parse_start, parse_end = get_source_range(lines, 'parsedebug') parseopt_start, parseopt_end = get_source_range(lines, 'parseopt') parseopt_notrack_start, parseopt_notrack_end = get_source_range(lines, 'parseopt-notrack') # Get the original source orig_lines = lines[parse_start:parse_end] # Filter the DEBUG sections out parseopt_lines = filter_section(orig_lines, 'DEBUG') # Filter the TRACKING sections out parseopt_notrack_lines = filter_section(parseopt_lines, 'TRACKING') # Replace the parser source sections with updated versions lines[parseopt_notrack_start:parseopt_notrack_end] = parseopt_notrack_lines lines[parseopt_start:parseopt_end] = parseopt_lines lines = [line.rstrip()+'\n' for line in lines] with open(os.path.join(dirname, 'yacc.py'), 'w') as f: f.writelines(lines) print('Updated yacc.py') if __name__ == '__main__': main()