c# 4.0 - Executing stored CSQueries -


i trying create crawler need able execute different queries extract different types of data crawled pages. i've been looking csquery extracing data, , seems work when have simple css-selector

h4:contains('texstring')

my problem need able evaluate complex queries following:

["h4:contains('textstring')"].parent().parent().find("div").find("span").text();

i haven't found great solution yet. csquery can above, if write in code, , since want able execute queries saved in database, need able load , execute queries dynamically. best idea make recursive function go through statement 1 dot @ time, result in 6 calls function able execute above query. seems end creating functionality present in csquery, can't figure out more elegant way solve problems.

any ideas appreciated.

there few ways this. first can use reflection , regular expressions convert c# string database expression. there lots of small projects this. option host scripting environment such iron python or jint , write expressions using 1 of those. third option use codedom , evaluate saved string converting assembly. each option has pros , cons.

the first option uses reflection can slow. can use c# natively. second option uses whole other language , requires setting scripting environment. can easier nonprogrammers develop expressions for. third option requires creating new assembly every time expression changes can't unloaded. option overall fastest in processing speed.

personally host jint keep learning curve down web folk , environment setup easy if need clr proper , csquery library access.


Comments

Post a Comment

Popular posts from this blog

android - Get AccessToken using signpost OAuth without opening a browser (Two legged Oauth) -

i using signpost oauth access data magento server. have read various tutorials on same , reach point open browser user can enter credentials. however, per requirement have automate part. hence, user should not browser page. have set-up done on server side ( magento ), hit url , returned call page. same through program in android. i have tried below, consumer = new commonshttpoauthconsumer(key, secret); provider = new commonshttpoauthprovider(oauth_init_url,access_token_url, authorize_url); try { provider.retrieverequesttoken(consumer, oauth.out_of_band); log.d("tokens" , consumer.gettoken() + " -- " + consumer.gettokensecret()); } and request tokens. dont know how bypass next step. tried directly accessing accesstoken (stupid of me) provider.retrieveaccesstoken(consumer, "mycallback://callback"); no luck, ends in oauth.signpost.exception.oauthnotauthorizedexception: authorization failed (server replied 401). ...
Read more

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: mockito -

getting error org.mockito.exceptions.misusing.invaliduseofmatchersexception: invalid use of argument matchers! 1 matchers expected, 2 recorded. exception may occur if matchers combined raw values: //incorrect: somemethod(anyobject(), "raw string"); when using matchers, arguments have provided matchers. example: //correct: somemethod(anyobject(), eq("string matcher")); at when( getprogramservice .callservice(any(getprogramtype.class))) .thenreturn(jaxbresponse); please explain error , possible resolution the code posted looks fine; don't see problem it. code before or above causing exception. key here: invalid use of argument matchers! 1 matchers expected, 2 recorded. any , used above, doesn't return "special kind of null" or "special kind of getprogramtype"; don't exist. instead, returns null , side effect puts matcher on stack. whe...
Read more

google shop client API returns 400 bad request error while adding an item -

i'm working on solution add items in google shopping market java application. following tutorial real mess because of missing classes of laste release, after setting 1.5-beta maven managed make base example typecheck correctly classes. still can make simple task of adding 1 item. instead of posting whole code i'm posting part creates product feed. private product createproduct(string id) { product product = new product(); product.title = "red wool sweater"; product.content = new content( "text", "comfortable , soft, sweater keep warm on " + "cold winter nights. red , blue stripes."); product.appcontrol = new appcontrol(); product.appcontrol.addrequireddestination("productads"); product.externalid = id; product.lang = "it"; product.country = "it"; product.condition = "nuovo"; product.price = new price("eu...
Read more