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|
### GOOGLE ###########################################################################################
# Code for querying Google for search terms, images, news and spelling.
# Also contains the searchenginesort algorithm originally used in Prism for NodeBox.
# Author: Tom De Smedt.
# Copyright (c) 2008 by Tom De Smedt.
# See LICENSE.txt for details.
import urllib
import simplejson
from url import URLAccumulator
from html import replace_entities, strip_tags, collapse_spaces
from cache import Cache
def clear_cache():
Cache("google").clear()
### GOOGLE SETTINGS ##################################################################################
GOOGLE_ID = "ABQIAAAAsHTxlz1n7jNlYECDj_EF1BT1NOe6bJHqZiq60f1JJ3OzEzDM5BQcAozHwWvFrwx2DDlP6xlTRnS6Cw"
### GOOGLE SERVICES ##################################################################################
GOOGLE_SEARCH = "search"
GOOGLE_IMAGES = "images"
GOOGLE_NEWS = "news"
GOOGLE_BLOGS = "blogs"
### GOOGLEERROR ######################################################################################
class GoogleError(Exception):
def __str__(self): return str(self.__class__)
### GOOGLE LICENSE ###################################################################################
def license_key(id=None):
global GOOGLE_ID
if id != None:
GOOGLE_ID = id
return GOOGLE_ID
### GOOGLE UNICODE ###################################################################################
def format_data(s):
""" Gogole library returns Unicode strings.
"""
return s.encode("utf-8")
### GOOGLE IMAGES ####################################################################################
SIZE_SMALL = "icon"
SIZE_MEDIUM = "medium"
SIZE_LARGE = "xxlarge"
SIZE_XLARGE = "huge"
def disambiguate_size(size):
if size.lower() in ("small", "s", "thumbnail", "thumb", "th", "t", "icon"):
return SIZE_SMALL
if size.lower() in ("medium", "m"):
return SIZE_MEDIUM
if size.lower() in ("large", "l"):
return SIZE_LARGE
if size.lower() in ("xlarge", "xl", "huge", "wallpaper"):
return SIZE_XLARGE
return size
### GOOGLERESULT #####################################################################################
class GoogleResult:
""" Creates an item in a GoogleSearch list object.
"""
def __init__(self):
self.title = None
self.url = None
self.description = None
self.date = None # news, blogs
self.author = None # news, blogs
self.location = None # news
def __repr__(self):
s = format_data(self.url)
return s
### GOOGLERESULTS ####################################################################################
class GoogleResults(list):
""" Creates a list of results from a Google query.
The total number of available results is stored in the results property.
Each item in the list is a GoogleResult object.
"""
def __init__(self, q, data, service=GOOGLE_SEARCH):
self.query = q
self.total = 0
if data == "": return
dict = simplejson.loads(data)
if dict["responseData"] == None: return
if service != GOOGLE_BLOGS:
try: self.total = int(dict["responseData"]["cursor"]["estimatedResultCount"])
except:
self.total = 0
for r in dict["responseData"]["results"]:
item = GoogleResult()
self.append(item)
item.title = self._parse(r["title"])
item.description = self._parse(r["content"])
if service != GOOGLE_BLOGS:
item.url = r["url"]
if service == GOOGLE_NEWS:
item.date = r["publishedDate"]
item.author = r["publisher"]
item.location = r["location"]
if service == GOOGLE_BLOGS:
item.url = r["blogUrl"]
item.date = r["publishedDate"]
if r["author"] != "unknown":
item.author = r["author"]
def _parse(self, str):
""" Parses the text data from an XML element defined by tag.
"""
str = replace_entities(str)
str = strip_tags(str)
str = collapse_spaces(str)
return str
def __cmp__(self, other):
""" Compares with another GoogleSearch based on the number of results.
"""
if self.total > other.total:
return 1
elif self.total < other.total:
return -1
else:
return 0
#### GOOGLESEARCH ####################################################################################
class GoogleSearch(GoogleResults, URLAccumulator):
def __init__(self, q, start=0, service=GOOGLE_SEARCH, size="",
wait=10, asynchronous=False, cached=True):
""" Searches Google for the given query.
By default, return cached results whenever possible.
Otherwise, go online and update the local cache.
The number of results is limited to 8 and starts at the given index.
You can only return up to 32 results.
The returned results depend on the service used:
web pages, images, news or blogs.
"""
self.query = q
self.service = service
if cached:
cache = "google"
else:
cache = None
url = "http://search.yahooapis.com/"
url = "http://ajax.googleapis.com/ajax/services/search/"
if service == GOOGLE_SEARCH : url += "web?"
if service == GOOGLE_IMAGES :
url += "images?"
if service == GOOGLE_NEWS : url += "news?"
if service == GOOGLE_BLOGS : url += "blogs?"
arg = urllib.urlencode((("v", 1.0),
("q", q),
("start", start),
("rsz", "large"),
("key", GOOGLE_ID),
("imgsz", disambiguate_size(size))))
url += arg
URLAccumulator.__init__(self, url, wait, asynchronous, cache, ".txt")
def load(self, data):
#if str(self.error.__class__) == str(HTTP403Forbidden().__class__):
# self.error = GoogleLimitError()
GoogleResults.__init__(self, self.query, data, self.service)
######################################################################################################
def search(q, start=0, wait=10, asynchronous=False, cached=False):
""" Returns a Google web query formatted as a GoogleSearch list object.
"""
service = GOOGLE_SEARCH
return GoogleSearch(q, start, service, "", wait, asynchronous, cached)
def search_images(q, start=0, size="", wait=10, asynchronous=False, cached=False):
""" Returns a Google images query formatted as a GoogleSearch list object.
"""
service = GOOGLE_IMAGES
return GoogleSearch(q, start, service, size, wait, asynchronous, cached)
def search_news(q, start=0, wait=10, asynchronous=False, cached=False):
""" Returns a Google news query formatted as a GoogleSearch list object.
"""
service = GOOGLE_NEWS
return GoogleSearch(q, start, service, "", wait, asynchronous, cached)
def search_blogs(q, start=0, wait=10, asynchronous=False, cached=False):
""" Returns a Google blogs query formatted as a GoogleSearch list object.
"""
service = GOOGLE_BLOGS
return GoogleSearch(q, start, service, "", wait, asynchronous, cached)
#### GOOGLE SORT #####################################################################################
def sort(words, context="", strict=True, relative=True, service=GOOGLE_SEARCH,
wait=10, asynchronous=False, cached=False):
"""Performs a Google sort on the given list.
Sorts the items in the list according to
the result count Google yields on an item.
Setting a context sorts the items according
to their relation to this context;
for example sorting [red, green, blue] by "love"
yields red as the highest results,
likely because red is the color commonly associated with love.
"""
results = []
for word in words:
q = word + " " + context
q.strip()
if strict: q = "\""+q+"\""
r = GoogleSearch(q, 1, service, "", wait, asynchronous, cached)
results.append(r)
results.sort(GoogleResults.__cmp__)
results.reverse()
if relative and len(results) > 0:
sum = 0.000000000000000001
for r in results: sum += r.total
for r in results: r.total /= float(sum)
results = [(r.query, r.total) for r in results]
return results
######################################################################################################
#r = search("food", cached=True, start=0)
#print r.total
#for item in r:
# print item
#print sort(["green", "blue", "red"], "apple")
#r = search_images("nodebox", cached=False, start=1)
#print r.total
#for item in r:
# print item, item.width, "x", item.height
#r = search_news("apple", cached=False, start=1, asynchronous=True)
#import time
#while not r.done:
# print "waiting..."
# time.sleep(0.1)
#print r.total
#for item in r:
# print item, item.source, item.language
#print suggest_spelling("amazoon")
#results = sort(["green", "blue", "red"], "sky", strict=False, cached=True)
#for word, count in results:
# print word, count
#ctx = '''
#The apple tree was perhaps the earliest tree to be cultivated,
#and apples have remained an important food in all cooler climates.
#To a greater degree than other tree fruit, except possibly citrus,
#apples store for months while still retaining much of their nutritive value.
#We are not looking for a company named Apple.
#'''
#r = search("apple", cached=False, start=1, context=ctx)
#print r.total
#for item in r:
# print item.title
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