晋太元中,武陵人捕鱼为业。缘溪行,忘路之远近。忽逢桃花林,夹岸数百步,中无杂树,芳草鲜美,落英缤纷。渔人甚异之,复前行,欲穷其林。 林尽水源,便得一山,山有小口,仿佛若有光。便舍船,从口入。初极狭,才通人。复行数十步,豁然开朗。土地平旷,屋舍俨然,有良田、美池、桑竹之属。阡陌交通,鸡犬相闻。其中往来种作,男女衣着,悉如外人。黄发垂髫,并怡然自乐。 见渔人,乃大惊,问所从来。具答之。便要还家,设酒杀鸡作食。村中闻有此人,咸来问讯。自云先世避秦时乱,率妻子邑人来此绝境,不复出焉,遂与外人间隔。问今是何世,乃不知有汉,无论魏晋。此人一一为具言所闻,皆叹惋。余人各复延至其家,皆出酒食。停数日,辞去。此中人语云:“不足为外人道也。”(间隔 一作:隔绝) 既出,得其船,便扶向路,处处志之。及郡下,诣太守,说如此。太守即遣人随其往,寻向所志,遂迷,不复得路。 南阳刘子骥,高尚士也,闻之,欣然规往。未果,寻病终。后遂无问津者。
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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()