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ygen.py
# 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()
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