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1 # ply: ygen.py
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2 #
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3 # This is a support program that auto-generates different versions of the YACC parsing
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4 # function with different features removed for the purposes of performance.
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5 #
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6 # Users should edit the method LParser.parsedebug() in yacc.py. The source code
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7 # for that method is then used to create the other methods. See the comments in
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8 # yacc.py for further details.
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9
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10 import os.path
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11 import shutil
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12
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13 def get_source_range(lines, tag):
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14 srclines = enumerate(lines)
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15 start_tag = '#--! %s-start' % tag
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16 end_tag = '#--! %s-end' % tag
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17
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18 for start_index, line in srclines:
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19 if line.strip().startswith(start_tag):
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20 break
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21
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22 for end_index, line in srclines:
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23 if line.strip().endswith(end_tag):
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24 break
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25
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26 return (start_index + 1, end_index)
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27
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28 def filter_section(lines, tag):
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29 filtered_lines = []
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30 include = True
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31 tag_text = '#--! %s' % tag
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32 for line in lines:
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33 if line.strip().startswith(tag_text):
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34 include = not include
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35 elif include:
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36 filtered_lines.append(line)
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37 return filtered_lines
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38
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39 def main():
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40 dirname = os.path.dirname(__file__)
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41 shutil.copy2(os.path.join(dirname, 'yacc.py'), os.path.join(dirname, 'yacc.py.bak'))
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42 with open(os.path.join(dirname, 'yacc.py'), 'r') as f:
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43 lines = f.readlines()
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44
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45 parse_start, parse_end = get_source_range(lines, 'parsedebug')
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46 parseopt_start, parseopt_end = get_source_range(lines, 'parseopt')
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47 parseopt_notrack_start, parseopt_notrack_end = get_source_range(lines, 'parseopt-notrack')
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48
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49 # Get the original source
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50 orig_lines = lines[parse_start:parse_end]
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51
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52 # Filter the DEBUG sections out
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53 parseopt_lines = filter_section(orig_lines, 'DEBUG')
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54
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55 # Filter the TRACKING sections out
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56 parseopt_notrack_lines = filter_section(parseopt_lines, 'TRACKING')
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57
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58 # Replace the parser source sections with updated versions
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59 lines[parseopt_notrack_start:parseopt_notrack_end] = parseopt_notrack_lines
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60 lines[parseopt_start:parseopt_end] = parseopt_lines
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61
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62 lines = [line.rstrip()+'\n' for line in lines]
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63 with open(os.path.join(dirname, 'yacc.py'), 'w') as f:
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64 f.writelines(lines)
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65
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66 print('Updated yacc.py')
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67
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68 if __name__ == '__main__':
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69 main()
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70
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