symbian-qemu-0.9.1-12/python-win32-2.6.1/lib/robotparser.py
changeset 1 2fb8b9db1c86
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/symbian-qemu-0.9.1-12/python-win32-2.6.1/lib/robotparser.py	Fri Jul 31 15:01:17 2009 +0100
@@ -0,0 +1,215 @@
+""" robotparser.py
+
+    Copyright (C) 2000  Bastian Kleineidam
+
+    You can choose between two licenses when using this package:
+    1) GNU GPLv2
+    2) PSF license for Python 2.2
+
+    The robots.txt Exclusion Protocol is implemented as specified in
+    http://info.webcrawler.com/mak/projects/robots/norobots-rfc.html
+"""
+import urlparse
+import urllib
+
+__all__ = ["RobotFileParser"]
+
+
+class RobotFileParser:
+    """ This class provides a set of methods to read, parse and answer
+    questions about a single robots.txt file.
+
+    """
+
+    def __init__(self, url=''):
+        self.entries = []
+        self.default_entry = None
+        self.disallow_all = False
+        self.allow_all = False
+        self.set_url(url)
+        self.last_checked = 0
+
+    def mtime(self):
+        """Returns the time the robots.txt file was last fetched.
+
+        This is useful for long-running web spiders that need to
+        check for new robots.txt files periodically.
+
+        """
+        return self.last_checked
+
+    def modified(self):
+        """Sets the time the robots.txt file was last fetched to the
+        current time.
+
+        """
+        import time
+        self.last_checked = time.time()
+
+    def set_url(self, url):
+        """Sets the URL referring to a robots.txt file."""
+        self.url = url
+        self.host, self.path = urlparse.urlparse(url)[1:3]
+
+    def read(self):
+        """Reads the robots.txt URL and feeds it to the parser."""
+        opener = URLopener()
+        f = opener.open(self.url)
+        lines = [line.strip() for line in f]
+        f.close()
+        self.errcode = opener.errcode
+        if self.errcode in (401, 403):
+            self.disallow_all = True
+        elif self.errcode >= 400:
+            self.allow_all = True
+        elif self.errcode == 200 and lines:
+            self.parse(lines)
+
+    def _add_entry(self, entry):
+        if "*" in entry.useragents:
+            # the default entry is considered last
+            self.default_entry = entry
+        else:
+            self.entries.append(entry)
+
+    def parse(self, lines):
+        """parse the input lines from a robots.txt file.
+           We allow that a user-agent: line is not preceded by
+           one or more blank lines."""
+        # states:
+        #   0: start state
+        #   1: saw user-agent line
+        #   2: saw an allow or disallow line
+        state = 0
+        linenumber = 0
+        entry = Entry()
+
+        for line in lines:
+            linenumber += 1
+            if not line:
+                if state == 1:
+                    entry = Entry()
+                    state = 0
+                elif state == 2:
+                    self._add_entry(entry)
+                    entry = Entry()
+                    state = 0
+            # remove optional comment and strip line
+            i = line.find('#')
+            if i >= 0:
+                line = line[:i]
+            line = line.strip()
+            if not line:
+                continue
+            line = line.split(':', 1)
+            if len(line) == 2:
+                line[0] = line[0].strip().lower()
+                line[1] = urllib.unquote(line[1].strip())
+                if line[0] == "user-agent":
+                    if state == 2:
+                        self._add_entry(entry)
+                        entry = Entry()
+                    entry.useragents.append(line[1])
+                    state = 1
+                elif line[0] == "disallow":
+                    if state != 0:
+                        entry.rulelines.append(RuleLine(line[1], False))
+                        state = 2
+                elif line[0] == "allow":
+                    if state != 0:
+                        entry.rulelines.append(RuleLine(line[1], True))
+                        state = 2
+        if state == 2:
+            self.entries.append(entry)
+
+
+    def can_fetch(self, useragent, url):
+        """using the parsed robots.txt decide if useragent can fetch url"""
+        if self.disallow_all:
+            return False
+        if self.allow_all:
+            return True
+        # search for given user agent matches
+        # the first match counts
+        url = urllib.quote(urlparse.urlparse(urllib.unquote(url))[2]) or "/"
+        for entry in self.entries:
+            if entry.applies_to(useragent):
+                return entry.allowance(url)
+        # try the default entry last
+        if self.default_entry:
+            return self.default_entry.allowance(url)
+        # agent not found ==> access granted
+        return True
+
+
+    def __str__(self):
+        return ''.join([str(entry) + "\n" for entry in self.entries])
+
+
+class RuleLine:
+    """A rule line is a single "Allow:" (allowance==True) or "Disallow:"
+       (allowance==False) followed by a path."""
+    def __init__(self, path, allowance):
+        if path == '' and not allowance:
+            # an empty value means allow all
+            allowance = True
+        self.path = urllib.quote(path)
+        self.allowance = allowance
+
+    def applies_to(self, filename):
+        return self.path == "*" or filename.startswith(self.path)
+
+    def __str__(self):
+        return (self.allowance and "Allow" or "Disallow") + ": " + self.path
+
+
+class Entry:
+    """An entry has one or more user-agents and zero or more rulelines"""
+    def __init__(self):
+        self.useragents = []
+        self.rulelines = []
+
+    def __str__(self):
+        ret = []
+        for agent in self.useragents:
+            ret.extend(["User-agent: ", agent, "\n"])
+        for line in self.rulelines:
+            ret.extend([str(line), "\n"])
+        return ''.join(ret)
+
+    def applies_to(self, useragent):
+        """check if this entry applies to the specified agent"""
+        # split the name token and make it lower case
+        useragent = useragent.split("/")[0].lower()
+        for agent in self.useragents:
+            if agent == '*':
+                # we have the catch-all agent
+                return True
+            agent = agent.lower()
+            if agent in useragent:
+                return True
+        return False
+
+    def allowance(self, filename):
+        """Preconditions:
+        - our agent applies to this entry
+        - filename is URL decoded"""
+        for line in self.rulelines:
+            if line.applies_to(filename):
+                return line.allowance
+        return True
+
+class URLopener(urllib.FancyURLopener):
+    def __init__(self, *args):
+        urllib.FancyURLopener.__init__(self, *args)
+        self.errcode = 200
+
+    def prompt_user_passwd(self, host, realm):
+        ## If robots.txt file is accessible only with a password,
+        ## we act as if the file wasn't there.
+        return None, None
+
+    def http_error_default(self, url, fp, errcode, errmsg, headers):
+        self.errcode = errcode
+        return urllib.FancyURLopener.http_error_default(self, url, fp, errcode,
+                                                        errmsg, headers)