/
parsers.py
345 lines (311 loc) · 13.4 KB
/
parsers.py
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import os
import copy
import collections
import math
from bs4 import BeautifulSoup
from resources import Resource, ResourceSet
from utils import correct_name_generator
# custom exception
class BadParsedNumPages(Exception):
pass
class BasePageParser:
DEFAULT_PARSER = 'lxml'
def __init__(self, html_stream):
self._html_stream = html_stream
correct_name_generator = staticmethod(correct_name_generator)
class MenuPageParser(BasePageParser):
def parse(self):
menu_dict = collections.OrderedDict()
soup = BeautifulSoup(self._html_stream, self.__class__.DEFAULT_PARSER)
divs = soup.find_all('div', {'id': 'heading1'})
for div in divs:
menu = {}
h4 = div.find('h4')
h4_verbose = h4.text.replace('\n', '').strip()
normalize_h4_verbose = self.__class__.correct_name_generator(h4_verbose)
inner_divs = div.find_next_siblings('div')
for inner_div in inner_divs:
lis = inner_div.find_all('li')
for li in lis:
a = li.find('a')
a_href = a['href']
a_verbose = a.get_text()
normalize_a_verbose = self.__class__.correct_name_generator(a_verbose)
menu_dict.setdefault(normalize_h4_verbose, []).append({
'name': normalize_a_verbose,
'url': a_href,
})
return menu_dict
class ListPageParser(BasePageParser):
ITEM_PER_PAGE = 100 # this is performance optimizer !!! reduce num requests !!! ~ 3x faster than 12 per page
PAGINATION_SUFFIX = '#list' # this is "fragment identified" SUFFIX for URL
def parse(self):
SECTION_ID = '#sectionId'
USAGES = '#usages'
resource_set = ResourceSet()
soup = BeautifulSoup(self._html_stream, self.__class__.DEFAULT_PARSER)
divs = soup.find_all('div', {'class': 'partTile'})
prev_url = None
for div in divs:
a = div.find('a')
a_href = a['href']
if USAGES in a_href:
continue
if SECTION_ID in a_href:
url = a_href.split('#')[0]
if prev_url is None:
resource = Resource(url=url)
resource_set.add(resource)
prev_url = url
continue
else:
if prev_url == url:
continue
else:
resource = Resource(url=url)
resource_set.add(resource)
prev_url = url
continue
resource = Resource(url=a_href)
resource_set.add(resource)
return resource_set
@classmethod
def get_num_pages(cls, html_stream):
soup = BeautifulSoup(html_stream, cls.DEFAULT_PARSER)
span = soup.find('span', {'class': 'resultCount'})
filtered = list(filter(None, span.get_text().split(' ')))
try:
get_number = filtered[-2]
try:
get_int = math.ceil(int(get_number) / cls.ITEM_PER_PAGE)
except ValueError:
get_number = get_number.replace(',', '')
get_int = math.ceil(int(get_number) / cls.ITEM_PER_PAGE)
return get_int
except IndexError:
raise BadParsedNumPages
@staticmethod
def generate_page_range(num_pages):
return range(1, num_pages+1)
@classmethod
def generate_valid_url(cls, url, page_num):
# URL: https://parts.ford.com/shop/en/us/accessories/electronics/<item_per_page>/<page>#list
return '{url}/{item_per_page}/{page_num}{suffix}'.format(
url=url,
item_per_page=cls.ITEM_PER_PAGE,
page_num=page_num,
suffix=cls.PAGINATION_SUFFIX
)
class JSParser:
LEFT_EXPRESSION = '['
COLON_EXPRESSION = ':'
ASSIGNMENT_EXPRESSION = '='
# SCHEMA's static variables are used only for testing purposes and prototyping...
SLIDER_SCHEMA = '''
<script type="text/javascript">
var imageServicesList = [];
imageServicesList = {
"imageData": [
{
"imageFolder": "047",
"imagePath": "https://parts.ford.com/images/photo-images/047/",
"imageName": "56047.jpg",
"imageSequence": "1.0"
},
{
"imageFolder": "046",
"imagePath": "https://parts.ford.com/images/photo-images/046/",
"imageName": "56046.jpg",
"imageSequence": "2.0"
},
{
"imageFolder": "045",
"imagePath": "https://parts.ford.com/images/photo-images/045/",
"imageName": "56045.jpg",
"imageSequence": "4.0"
},
{
"imageFolder": "045",
"imagePath": "https://parts.ford.com/images/photo-images/045/",
"imageName": "56045.jpg",
"imageSequence": "4.0"
},{
"imageFolder": "045",
"imagePath": "https://parts.ford.com/images/photo-images/045/",
"imageName": "56045.jpg",
"imageSequence": "4.0"
},
]
};
var imageHostName='https://parts.ford.com';
</script>
'''
SECTION_IDS_SCHEMA = '''
<script>
var recordSetTotal =0;
recordSetTotal= 2;
var vinDataComplete=true;
url = window.location.href;
var productDetailsSectionId ='4093766';
if(url.indexOf('#sectionId:') !=-1){
var usageItemsList = [];
usageItemsList = [
{
"xads_3sectiondescription": "Anti-Lock Braking System",
"displayDescription": "02/22/2010 - 07/05/2016, F250/350/450/550 Super Duty, Less Traction Control, With Trailer Sway Control (TSC)",
"xads_5sectionid": "4093766",
"mfName_ntk": "Ford",
"name": "Bracket ",
"buyable": 0,
"longDescription": ["02/22/2010 - 07/05/2016, F250/350/450/550 Super Duty, Less Traction Control, With Trailer Sway Control (TSC)"],
"catentry_id": "7003158",
"parentCatentry_id": [6596539],
"storeent_id": 1251,
"xillustration_thumb": "f020808502.png",
"partNumber_ntk": "1832512_991040_132_1",
"xillustration_full": "f020808502.svg",
"xbuyable_catentry_id": "6596540"
},
{
"xads_3sectiondescription": "Anti-Lock Braking System",
"displayDescription": "02/22/2010 - 07/05/2016, F250/350/450/550 Super Duty, Roll Stability Control Brk W/Betc",
"xads_5sectionid": "4067933",
"mfName_ntk": "Ford",
"name": "Bracket ",
"buyable": 0,
"longDescription": ["02/22/2010 - 07/05/2016, F250/350/450/550 Super Duty, Roll Stability Control Brk W/Betc"],
"catentry_id": "7003162",
"parentCatentry_id": [6596539],
"storeent_id": 1251,
"xillustration_thumb": "f022372602.png",
"partNumber_ntk": "1832512_994438_132_1",
"xillustration_full": "f022372602.svg",
"xbuyable_catentry_id": "6596540"
}
];
for(var i=0;i<usageItemsList.length;i++){
if(url.substring(url.indexOf('#sectionId:')+11) == usageItemsList[i].xads_5sectionid){
var productDetailsSectionId= url.substring(url.indexOf('#sectionId:')+11);
break;
}
}
}
</script>
'''
def __init__(self, soup):
self.soup = soup
def get_slider_script_tag(self):
scripts = self.soup.find_all('script')
for index, script in enumerate(scripts):
get_text = script.get_text()
if 'imageFolder' in get_text and \
'imagePath' in get_text and \
'imageName' in get_text and \
'imageSequence' in get_text:
return get_text
# implements JS source code parser
def get_slider_images(self):
get_text = self.get_slider_script_tag()
if get_text is None:
return []
tokens = filter(None, get_text.split('\n'))
pathes, names = [], []
for token in tokens:
if self.__class__.COLON_EXPRESSION in token and \
self.__class__.LEFT_EXPRESSION not in token and \
self.__class__.ASSIGNMENT_EXPRESSION not in token:
token = token.replace('"', '').replace(',', '').replace('\t', '').replace(' ', '')
if 'imagePath' in token:
path = token.split('imagePath:')[1]
pathes.append(path)
if 'imageName' in token:
name = token.split('imageName:')[1]
names.append(name)
make_zip = zip(pathes, names)
images = [os.path.join(path, name) for path, name in make_zip]
return images
def get_section_script_tag(self):
scripts = self.soup.find_all('script')
for index, script in enumerate(scripts):
get_text = script.get_text()
if '"xads_5sectionid"' in get_text:
return get_text
# implements JS source code parser
def get_section_ids(self):
get_text = self.get_section_script_tag()
section_ids = []
if get_text is None:
return section_ids
tokens = filter(None, get_text.split('\n'))
for token in tokens:
if token == '\t':
continue
token = token.replace('\t', '').replace(' ', '')
if not token:
continue
if '"xads_5sectionid"' in token:
token = token.split(':')[1].rstrip(',').replace('"', '') # this is sectionId
section_ids.append(token)
return section_ids
class ContentPageParser(BasePageParser):
def parse_related(self, soup):
inputs = soup.find('div', {'class': 'form-group search-filed'})
related = {'partnumber': ''}
for input_ in inputs.find_all('input'):
if 'partnumber' in input_['name']:
related[input_['name']] = input_['value']
elif 'vehicleId' in input_['name']:
related[input_['name']] = input_['value']
elif 'parent_category_rn' in input_['name']:
related[input_['name']] = input_['value']
elif 'categoryId' in input_['name']:
related[input_['name']] = input_['value']
elif 'catalogId' in input_['name']:
related[input_['name']] = input_['value']
elif 'langId' in input_['name']:
related[input_['name']] = input_['value']
elif 'storeId' in input_['name']:
related[input_['name']] = input_['value']
return related
def parse(self):
parsed_dict = {}
soup = BeautifulSoup(self._html_stream, self.__class__.DEFAULT_PARSER)
h2 = soup.find('h2', {'id': 'productName'})
span = soup.find('span', {'id': 'productPartNumber'})
image_list = soup.find_all('img', {'class': 'bdr img-responsive'})
images = [image['src'] for image in image_list]
js_parser = JSParser(soup)
slider_images = js_parser.get_slider_images()
section_ids = js_parser.get_section_ids()
xhr_request_body = self.parse_related(soup)
od_section = collections.OrderedDict()
sections_data = zip(section_ids, images)
for section_id, image in sections_data:
xhr_dict = copy.copy(xhr_request_body) # python's dict is mutable ! use shallow copy to avoid reference on same pointer !!!
xhr_dict.update({'sectionId': section_id})
od_section[section_id] = {
'image': image,
'xhr_request_body': xhr_dict,
'text': ''
}
number = self.__class__.parse_number(span.text.split('\n'))
title = h2.get_text().replace('\n', '').strip()
parsed_dict.update({
'title': title,
'number': number,
'slider_images': slider_images,
'section_data': od_section
})
return parsed_dict
@classmethod
def xhr_response_parser(cls, html_stream):
soup = BeautifulSoup(html_stream, cls.DEFAULT_PARSER)
h4s = soup.find_all('h4', {'class': 'panel-title'})
text = ''
for h4 in h4s:
text += h4.get_text().replace('\n', '').replace(' ', '').replace('\t', '') +'\n'
return text
@staticmethod
def parse_number(number_str):
filtered = list(filter(None, number_str))
return filtered[0]