75 lines
2.2 KiB
Python
75 lines
2.2 KiB
Python
# 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()
|
|
|
|
|
|
|
|
|
|
|