rewriting

问题 I'm currently working on a modified version of the Shunting Yard Algorithm that would work with variables, but I cant figure out how to get it to work. For example, I would want the algorithm to re-write 2 * (2x + 5) - 5 to 4x + 5. Any ideas / links to already implemented algorithms that does this already? 回答1: Take the expression: 2 * (2x + 5) - 5 Add the * symbol to make it more understandable for the computer: 2 * (2*x + 5) - 5 Parse it using the Shunting Yard Algorithm, it becomes: 2 2 x

问题 I am attempting to write a userspace application that can hook into an OS's network stack, sniff packets flying past and edit ones that its interested in. After much Googling, it appears to me that the simplest (yet reasonably robust) method of doing so (on any platform) is Linux's libnetfilter_queue project. However, I'm having trouble finding any reasonable documentation for the project, outside of the limited official documentation. Its main features (as stated by the first link are)

问题 I have written a function match-rewriter that is essentially match-lambda except that it returns its argument if no match is found: (define-syntax match-rewriter (syntax-rules () ((_ (patt body) ...) (λ (x) (match x (patt body) ... (_ x)))))) Now I would like to use match-rewriter to take strings representing source code for let* and rewrite it as nested unary lets : (define let*→nested-unary-lets (match-rewriter (`(let*((,<var> ,<val>) ...) ,<expr1> ,<expr2> ...) I am really stumped over how

问题 I am working on my website where URL is something like: http://mywebsite.com/series.php?sid=1&part=1&name=Introduction%20to%20HTML I have tried a rule in my htaccess which is: RewriteRule ^([^/]+)/([^/]+)/([^\.]+)\.html$ /series.php?sid=$1&part=$2&name=$3 In order to rewrite URL in form of: http://mywebsite.com/1/1/Introduction to html.html Unfortunately, it is not working for me. Please someone help me in sorting out the issue. I would also love it if someone makes me understand how it

问题 this is the first time i use nginx , and i have two problems with it, the first one is that i want to redirect http://localhost/project automatically to http://localhot/project/en/ and en is subdirectory on project. The second problem : in localhost/project/en/ i can see the index.php i mean the main page but every redirecting from the project give me 404 not found like localhost/project/en/people/ or localhost/project/en/people/article1 NB : i use nginx in windows with drupal and . here is

问题 I have been looking all over the place to find some code to work with my godaddy URL Rewriting, but no luck. I am trying to make my website with Friendly URLS with .htaccess e.g. domain.com/company/buy/items.php?fatherID=23 ==> into ==> domain.com/23 I tried almost all codes and the best i got to is removing the .php Sample Code: Options +FollowSymLinks -MultiViews Turn mod_rewrite on RewriteEngine On RewriteBase / RewriteRule ^/([0-9]+)/?$ company/items.php?fatherID=$1 [NC,L] Does anyone

问题 Before I go ahead and ask you my question, I understand that there are many methods on the internet to accomplish this sort of thing. I understand also that this process is called rewriting urls. However, since I am not a proffesional at coding, the process of these things seem very daunting and hard to understand. So, I thought I'd ask the StackOverflow community for help! Here's what I'd like. Currently, I have 2 main files. index.php and php.php . My site allows users to enter a username

问题 I was reading the paper authored by Simon Peyton Jones, et al. named “Playing by the Rules: Rewriting as a practical optimization technique in GHC”. In the second section, namely “The basic idea” they write: Consider the familiar map function, that applies a function to each element of a list. Written in Haskell, map looks like this: map f [] = [] map f (x:xs) = f x : map f xs Now suppose that the compiler encounters the following call of map : map f (map g xs) We know that this expression is