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Commit dc8b7980 authored by Guido van Rossum's avatar Guido van Rossum
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Skip Montanaro: 

The robotparser.py module currently lives in Tools/webchecker.  In
preparation for its migration to Lib, I made the following changes:

    * renamed the test() function _test
    * corrected the URLs in _test() so they refer to actual documents
    * added an "if __name__ == '__main__'" catcher to invoke _test()
      when run as a main program
    * added doc strings for the two main methods, parse and can_fetch
    * replaced usage of regsub and regex with corresponding re code
parent 0c3baaf1
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Showing with 34 additions and 34 deletions
Lib/robotparser.py
View file @ dc8b7980
......@@ -23,15 +23,14 @@ class RobotFileParser:
def set_url(self, url):
self.url = url
## import urlmisc
## self.url = urlmisc.canonical_url(url)
def read(self):
import urllib
self.parse(urllib.urlopen(self.url).readlines())
def parse(self, lines):
import regsub, string, regex
"""parse the input lines from a robot.txt file"""
import string, re
active = []
for line in lines:
if self.debug: print '>', line,
......@@ -43,7 +42,7 @@ class RobotFileParser:
line = string.strip(line[:string.find(line, '#')])
if not line:
continue
line = regsub.split(line, ' *: *')
line = re.split(' *: *', line)
if len(line) == 2:
line[0] = string.lower(line[0])
if line[0] == 'user-agent':
......@@ -56,7 +55,7 @@ class RobotFileParser:
if line[1]:
if self.debug: print '>> disallow:', line[1]
for agent in active:
self.rules[agent].append(regex.compile(line[1]))
self.rules[agent].append(re.compile(line[1]))
else:
pass
for agent in active:
......@@ -68,30 +67,31 @@ class RobotFileParser:
self.modified()
# returns true if agent is allowed to fetch url
def can_fetch(self, agent, url):
def can_fetch(self, useragent, url):
"""using the parsed robots.txt decide if useragent can fetch url"""
import urlparse
ag = agent
ag = useragent
if not self.rules.has_key(ag): ag = '*'
if not self.rules.has_key(ag):
if self.debug: print '>> allowing', url, 'fetch by', agent
if self.debug: print '>> allowing', url, 'fetch by', useragent
return 1
path = urlparse.urlparse(url)[2]
for rule in self.rules[ag]:
if rule.match(path) != -1:
if self.debug: print '>> disallowing', url, 'fetch by', agent
if rule.match(path) is not None:
if self.debug: print '>> disallowing', url, 'fetch by', useragent
return 0
if self.debug: print '>> allowing', url, 'fetch by', agent
if self.debug: print '>> allowing', url, 'fetch by', useragent
return 1
def test():
def _test():
rp = RobotFileParser()
rp.debug = 1
rp.set_url('http://www.automatrix.com/robots.txt')
rp.set_url('http://www.musi-cal.com/robots.txt')
rp.read()
print rp.rules
print rp.can_fetch('*', 'http://www.calendar.com/concerts/')
print rp.can_fetch('*', 'http://www.musi-cal.com.com/')
print rp.can_fetch('Musi-Cal-Robot',
'http://dolphin:80/cgi-bin/music-search?performer=Rolling+Stones')
'http://www.musi-cal.com/cgi-bin/event-search?city=San+Francisco')
print rp.can_fetch('Lycos', 'http://www/~skip/volkswagen/')
print rp.can_fetch('Lycos', 'http://www/~skip/volkswagen/vanagon-list-001')
if __name__ == "__main__":
_test()
Tools/webchecker/robotparser.py
View file @ dc8b7980
......@@ -23,15 +23,14 @@ class RobotFileParser:
def set_url(self, url):
self.url = url
## import urlmisc
## self.url = urlmisc.canonical_url(url)
def read(self):
import urllib
self.parse(urllib.urlopen(self.url).readlines())
def parse(self, lines):
import regsub, string, regex
"""parse the input lines from a robot.txt file"""
import string, re
active = []
for line in lines:
if self.debug: print '>', line,
......@@ -43,7 +42,7 @@ class RobotFileParser:
line = string.strip(line[:string.find(line, '#')])
if not line:
continue
line = regsub.split(line, ' *: *')
line = re.split(' *: *', line)
if len(line) == 2:
line[0] = string.lower(line[0])
if line[0] == 'user-agent':
......@@ -56,7 +55,7 @@ class RobotFileParser:
if line[1]:
if self.debug: print '>> disallow:', line[1]
for agent in active:
self.rules[agent].append(regex.compile(line[1]))
self.rules[agent].append(re.compile(line[1]))
else:
pass
for agent in active:
......@@ -68,30 +67,31 @@ class RobotFileParser:
self.modified()
# returns true if agent is allowed to fetch url
def can_fetch(self, agent, url):
def can_fetch(self, useragent, url):
"""using the parsed robots.txt decide if useragent can fetch url"""
import urlparse
ag = agent
ag = useragent
if not self.rules.has_key(ag): ag = '*'
if not self.rules.has_key(ag):
if self.debug: print '>> allowing', url, 'fetch by', agent
if self.debug: print '>> allowing', url, 'fetch by', useragent
return 1
path = urlparse.urlparse(url)[2]
for rule in self.rules[ag]:
if rule.match(path) != -1:
if self.debug: print '>> disallowing', url, 'fetch by', agent
if rule.match(path) is not None:
if self.debug: print '>> disallowing', url, 'fetch by', useragent
return 0
if self.debug: print '>> allowing', url, 'fetch by', agent
if self.debug: print '>> allowing', url, 'fetch by', useragent
return 1
def test():
def _test():
rp = RobotFileParser()
rp.debug = 1
rp.set_url('http://www.automatrix.com/robots.txt')
rp.set_url('http://www.musi-cal.com/robots.txt')
rp.read()
print rp.rules
print rp.can_fetch('*', 'http://www.calendar.com/concerts/')
print rp.can_fetch('*', 'http://www.musi-cal.com.com/')
print rp.can_fetch('Musi-Cal-Robot',
'http://dolphin:80/cgi-bin/music-search?performer=Rolling+Stones')
'http://www.musi-cal.com/cgi-bin/event-search?city=San+Francisco')
print rp.can_fetch('Lycos', 'http://www/~skip/volkswagen/')
print rp.can_fetch('Lycos', 'http://www/~skip/volkswagen/vanagon-list-001')
if __name__ == "__main__":
_test()
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