created basic structure of ChemSpider search parser

FourmiCrawler/parsers/ChemSpider.py

@@ -0,0 +1,32 @@
+from scrapy import log
+from scrapy.http import Request
+from scrapy.selector import Selector
+from FourmiCrawler.items import Result
+from ChemSpider_token import TOKEN #TODO: move the token elsewhere
+
+"""
+This parser will manage searching for chemicals through the ChemsSpider API,
+and parsing the resulting ChemSpider page. 
+The token required for the API should be in a configuration file somewhere.
+"""
+class ChemSpider:
+    
+    website = "http://www.chemspider.com/*"
+    __spider = 'ChemSpider'
+
+    search = "Search.asmx/SimpleSearch?query=%s&token=%s"
+
+    print "ChemSpider start"
+    log.msg('chemspider start', level=log.DEBUG)
+
+    def parse(self, response):
+        sel = Selector(response)
+        log.msg('chemspider parse', level=log.DEBUG)
+        print "ChemSpider parse"
+        pass
+    
+    def new_compound_request(self,compound):
+        searchurl = website[:-1] + search % (compound, TOKEN)
+        log.msg('chemspider compound', level=log.DEBUG)
+        print "ChemSpider compound"
+        return Request(url=searchurl, callback=self.parse)