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• Visualizing an AST created with ANTLR (in a .Net environment)

  - by Benjamin Podszun

  Hi there. For a pet project I started to fiddle with ANTLR. After following some tutorials I'm now trying to create the grammar for my very own language and to generate an AST. For now I'm messing around in ANTLRWorks mostly, but now that I have validated that the parse tree seems to be fine I'd like to (iteratively, because I'm still learning and still need to make some decisions regarding the final structure of the tree) create the AST. It seems that antlrworks won't visualize it (or at least not using the "Interpreter" feature, Debug's not working on any of my machines). Bottom line: Is the only way to visualize the AST the manual way, traversing/showing it or printing the tree in string representation to a console? What I'm looking for is a simple way to go from input, grammar - visual AST representation a la the "Interpreter" feature of ANTLRWorks. Any ideas?

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• Do different versions of Perl require different CPAN module installations?

  - by Leonard

  We have a server farm that we are slowly migrating to a new version of Perl (5.12.1). We are currently running 5.8.5. The OS will be upgraded from RedHat 4 to RedHat 5 as well, but RedHat 5 is still back on Perl 5.8.8. Thus for a while in our source tree we'll be supporting two versions of Perl. I have been told to install the new version of Perl into our source tree, and also all of the CPAN modules we currently use. I was actualy told to 'compile' the modules with the correct version of Perl. I'm confused by this. Do some modules actually configure themselves differently for different versions of Perl? Given this, I assume I should configure a CPAN directory for each version of Perl in our tree? Any information or 'gotchas' about this scenario?

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• What can cause legit MySql INSERT INTO command to fail?

  - by Makis

  I can't figure out what's causing my INSERT INTO's to fail to certain table in MySql. I can manage them to other tables. The table looks like: CREATE TABLE IF NOT EXISTS `Match` ( `id` int(11) NOT NULL AUTO_INCREMENT, `match_no` int(11) NOT NULL, `season` int(11) NOT NULL, `hometeam` int(11) NOT NULL, `awayteam` int(11) NOT NULL, PRIMARY KEY (`id`), KEY `match_no` (`match_no`), KEY `season` (`season`), KEY `hometeam` (`hometeam`), KEY `awayteam` (`awayteam`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ; And the command is INSERT INTO Match (`match_no`, `season`, `hometeam`, `awaytem`) VALUES (1, 1, 2, 3) All I get is: 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Match (match_no, season, hometeam, awaytem) VALUES (1, 1, 2, 3)' at line 1 I have checked the manual and half-a-dozen examples from the web and whatnought and tried all sorts of changes to the syntax in case there is some MySql specific oddity, but nothing seems to work.

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• Web scraping with Python

  - by Jack

  I'm currently trying to scrape a website that has fairly poorly-formatted HTML (often missing closing tags, no use of classes or ids so it's incredibly difficult to go straight to the element you want, etc.). I've been using BeautifulSoup with some success so far but every once and a while (though quite rarely), I run into a page where BeautifulSoup creates the HTML tree a bit differently from (for example) Firefox or Webkit. While this is understandable as the formatting of the HTML leaves this ambiguous, if I were able to get the same parse tree as Firefox or Webkit produces I would be able to parse things much more easily. The problems are usually something like the site opens a <b> tag twice and when BeautifulSoup sees the second <b> tag, it immediately closes the first while Firefox and Webkit nest the <b> tags. Is there a web scraping library for Python (or even any other language (I'm getting desperate)) that can reproduce the parse tree generated by Firefox or WebKit (or at least get closer than BeautifulSoup in cases of ambiguity).

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• Web scraping with Python

  - by Jack

  I'm currently trying to scrape a website that has fairly poorly-formatted HTML (often missing closing tags, no use of classes or ids so it's incredibly difficult to go straight to the element you want, etc.). I've been using BeautifulSoup with some success so far but every once and a while (though quite rarely), I run into a page where BeautifulSoup creates the HTML tree a bit differently from (for example) Firefox or Webkit. While this is understandable as the formatting of the HTML leaves this ambiguous, if I were able to get the same parse tree as Firefox or Webkit produces I would be able to parse things much more easily. The problems are usually something like the site opens a <b> tag twice and when BeautifulSoup sees the second <b> tag, it immediately closes the first while Firefox and Webkit nest the <b> tags. Is there a web scraping library for Python (or even any other language (I'm getting desperate)) that can reproduce the parse tree generated by Firefox or WebKit (or at least get closer than BeautifulSoup in cases of ambiguity).

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• create table from another table in different database in sql server 2005

  - by Greg

  Hi, I have a database "temp" with table "A". I created new database "temp2". I want to copy table "A" from "temp" to a new table in "temp2" . I tried this statement but it says I have incorrect syntax, here is the statement: CREATE TABLE B IN 'temp2' AS (SELECT * FROM A IN 'temp'); Here is the error: Msg 156, Level 15, State 1, Line 2 Incorrect syntax near the keyword 'IN'. Msg 156, Level 15, State 1, Line 3 Incorrect syntax near the keyword 'IN'. Anyone knows whats the problem? Thanks in advance, Greg

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• How can I get elements out of an array with Template Toolkit?

  - by Przemek

  I have an array of Paths which i want to read out with Template Toolkit. How can I access the array Elements of this array? The Situation is this: my @dirs; opendir(DIR,'./directory/') || die $!; @dirs = readdir(DIR); close DIR; $vars->{'Tree'} = @dirs; Then I call the Template Page like this: $template->process('create.tmpl', $vars) || die "Template process failed: ", $template->error(), "\n"; In this template I want to make an Tree of the directories in the array. How can I access them? My idea was to start with a foreach in the template like this [% FOREACH dir IN Tree.dirs %] $dir [% END %]

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• begin...end VS braces {...} VS indentation grouping

  - by Halst

  Hi, everyone. I don't want to fuel any holy-wars here, but I need to ask your opinion. Right now I'm in process of designing a Hardware Description Language as a project in my university. I decided to take VHDL language and just add some syntax-sugar 'coz VHDL is rather obese in syntax. I decided to use indentation to group blocks of code (like in Python), and I'm strongly criticized for that. Originally Begin...End; grouping is used in VHDL language. I have no clue what are cons and pros of these 3 types of grouping, the only thing I know is that I like Python style and I don't understand if it's usage could be erroneous or something? What do you think? What do you like? (hope that I can get some feedback from people who extensively used different languages with different code-grouping syntax, like Pasca, Ada, Delphi, C, C++, C#, Java, Python)

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• Help with Btree homework

  - by Phenom

  I need to do a preorder traversal of a Btree, and among other things, print the following information for each page (which is the same thing as a node): The B-Tree page number The value of each B-Tree page pointer (e.g., address, byte offset, RRN). My questions are: 1. How do you figure out the byte offset? What is it offset from? 2. Isn't the RRN the same as the page number? Note: A Btree is NOT A BINARY TREE. Btrees can have multiple keys in each node, and a node with n keys has n+1 child pointers.

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• Ruby Metaprogramming

  - by VP

  I'm trying to write a DSL that allows me to do Policy.name do author "Foo" reviewed_by "Bar" end The following code can almost process it: class Policy include Singleton def self.method_missing(name,&block) puts name puts "#{yield}" end def self.author(name) puts name end def self.reviewed_by(name) puts name end end Defining my method as class methods (self.method_name) i can access it using the following syntax: Policy.name do Policy.author "Foo" Policy.reviewed_by "Bar" end If i remove the "self" from the method names, and try to use my desired syntax, then i receive an error "Method not Found" in the Main so it could not find my function until the module Kernel. Its ok, i understand the error. But how can i fix it? How can i fix my class to make it work with my desired syntax that?

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• HTML5: HTML VS XHTML spec question regarding comments

  - by NoozNooz42

  In the W3C working draft for HTML5 here's a line I find confusing: http://www.w3.org/TR/html5/introduction.html#html-vs-xhtml Comments that contain the string "--" can be represented in the DOM but not in the HTML syntax or in XML. I can interpret this in two different ways: Comments that contain the string "--" can be represented in XML and in the DOM but not in the HTML syntax Comments that contain the string"--" can be represented in the DOM but neither in the HTML syntax nor in XML. I really find the original formulation highly confusing. Which one does it mean and is it even correct english? Who should I contact if I want to point out that I find such a wording highly confusing and that hence there's a high probability that other non-native english speaker would find this kind of formulation highly confusing too?

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• preg_match problem

  - by Biroka

  I'm trying to get some stuff from a string in php. In RegexBuddy and Regular expression tester (firefox addon) it works good, but php gives me the following: Warning: preg_match() [function.preg-match]: Compilation failed: unmatched parentheses at offset 34 in D:\path\example.php on line 62 my pattern is "/.{4}_tmp\\([A-Za-z0-9.\\]*)\(([0-9]*)\) : (.*)/i" an example string: C:\Temp\browseide\projects\32\821C_tmp\SourceFiles\main.c(8) : error C2143: syntax error : missing ';' before 'for' what RegexBuddy gets: 821C_tmp\SourceFiles\main.c(8) : error C2143: syntax error : missing ';' before 'for' Group 1: SourceFiles\main.c Group 2: 8 Group 3: error C2143: syntax error : missing ';' before 'for'

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• Error including image in Latex

  - by euphoria83

  I am getting the following error while compiling my Latex File : ! LaTeX Error: Cannot determine size of graphic in tree.jpg (no BoundingBox). Why do I get this error ? What has this to do with an .eps file ? Infact, I could compile it fine with MacTex on my machine. But when I submit it online to a scientific journal for publication, it compiles it on the server and sends me the resultant PDF which as all these error that prevent it from compiling. I am using the following syntax for including the images : \begin{figure}[!h] \begin{center} \scalebox{0.45}{ \includegraphics{tree.jpg}} \end{center} \caption{\small A sample} \label{tree} \end{figure} What should I do ? Could it be that their server is using an old compiler ? UPDATE : It finally worked. I converted the first image to PDF and the compilation happened perfectly. I guess it used the bounding box value from that PDF and applied it to all images.

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• Why can't I use 'django-admin.py makemessages -l cn'

  - by zjm1126

  print : D:\zjm_code\register2>python D:\Python25\Lib\site-packages\django\bin\django-adm in.py makemessages -l cn Error: This script should be run from the Django SVN tree or your project or app tree. If you did indeed run it from the SVN checkout or your project or applica tion, maybe you are just missing the conf/locale (in the django tree) or locale (for project and application) directory? It is not created automatically, you ha ve to create it by hand if you want to enable i18n for your project or applicati on. 2.i made a locale directory ,and D:\zjm_code\register2>python D:\Python25\Lib\site-packages\django\bin\django-adm in.py makemessages -l cn processing language cn Error: errors happened while running xgettext on __init__.py 'xgettext' ?????????,????????? ??????? D:\Python25\lib\site-packages\django\core\management\base.py:234: RuntimeWarning : tp_compare didn't return -1 or -2 for exception sys.exit(1) 3. ok http://hi.baidu.com/zjm1126/blog/item/f28e09deced15353ccbf1a82.html

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• Are there any purely functional Schemes or Lisps?

  - by nickname

  Over the past few months, I've put a lot of effort into learning (or attempting to learn) several functional programming languages. I really like math, so they have been very natural for me to use. Simply to be more specific, I have tried Common Lisp, Scheme, Haskell, OCaml, and (a little bit of) Erlang. I did not like the syntax of OCaml and do not have enough Erlang knowledge to make a judgment on it yet. Because of its consistent and beautiful (non-)syntax, I really like Scheme. However, I really do appreciate the stateless nature of purely functional programming languages such as Haskell. Haskell looks very interesting, but the amount of inconsistent and non-extendable syntax really bothered me. In the interest of preventing a Lisp vs Haskell flame war, just pretend that I can't use Haskell for some other reason. Therefore, my question is: Are there any purely functional Schemes (or Lisps in general)?

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• Linux Kernel - Slab Allocator Question

  - by Drex

  I am playing around with the kernel and am looking at the kmem_cache files_cachep belonging to fork.c. It detects the sizeof(files_struct). My question is this: I have altered files_struct and added a rb_root (red/black tree root) using the built-in functionality in linux/rbtree.h. I can properly insert values into this tree. However, at some point, a segfault occurs and GDB backtraces the following information: (gdb) backtrace 0 0x08066ad7 in page_ok (page=) at arch/um/os-Linux/sys-i386/task_size.c:31 1 0x08066bdf in os_get_top_address () at arch/um/os-Linux/sys-i386/task_size.c:100 2 0x0804a216 in linux_main (argc=1, argv=0xbfb05f14) at arch/um/kernel/um_arch.c:277 3 0x0804acdc in main (argc=1, argv=0xbfb05f14, envp=0xbfb05f1c) at arch/um/os-Linux/main.c:150 I have spent many hours trying to figure out why there is a segfault given that the red/black tree inserts properly. I'm thinking it's a memory allocation issue with new processes made by fork() of a parent process. Could this be the case and could it have something to do with kmem_cache files_cachep?

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• How to do a range query

  - by Walter H

  I have a bunch of numbers timestamps that I want to check against a range to see if they match a particular range of dates. Basically like a BETWEEN .. AND .. match in SQL. The obvious data structure would be a B-tree, but while there are a number of B-tree implementations on CPAN, they only seem to implement exact matching. Berkeley DB has the same problem; there are B-tree indices, but no range matching. What would be the simplest way to do this? I don't want to use an SQL database unless I have to. Clarification: I have a lot of these, so I'm looking for an efficient method, not just grep over an array.

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• Where is App.config?

  - by Zian Choy

  I'm trying to set up logging with Microsoft's Enterprise Library (log4net seems to be a dead project). I'm using VB .NET 2008 and VS 2008. I've searched all over the MSDN documentation, CodePlex docs (including the Hands-On labs that installed and then vanished), and online tutorials to no avail. They all refer to a mysterious "configuration file" or "App.config" that I can't find and can't seem to add. I even tried adding a new text file and renaming it "App.config" but that only made VS 2008 spit out a red wavy line on a blank file. Any suggestions for finding the elusive app.config would be greatly appreciated. (and, if that makes the EntLib configuration tool show up, I'll be absolutely delighted) Edit: I've been tricked! The tree in VS 2008 isn't a true superset-subset relationship, which is why I got so frustrated. To wit, the top of the tree: And a 'sub-section' of the tree.

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• Preventing what was/were previously copied on to my clipboard from appearing on R Console when using

  - by Bazon

  Hi all, I am having some problems with my clipboard contents when using R. When I run my scripts/commands in tinn-r, very often I would get something that I had ran earlier pasted onto my R Console instead of the command that I have just selected. To get over this, I would go to my clipboard and delete its content(text/syntax). However, the same text/syntax that I had just deleted would re-appear on my clipboard and would again appear on my R Console when trying to run a different syntax from my tinn-r. Any help would be appreciated. Bazon

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• sqlite3 date and interval functions

  - by umuthorax

  Hi, I wonder whether sqlite3 supports interval function. The following statement is accepted by PostgreSQL, however sqlite3 failed to parse it; select ... from orders where ... and o_orderdate < date '1995-03-01' + interval '3' month Error: near line 4: near "'1995-03-01'": syntax error Then, I modified the statement a little bit such as; and o_orderdate < date('1995-03-01') + interval '3' month This time the error was; Error: near line 4: near "'3'": syntax error Unfortunately, same trick did not work for the interval function i.e. and o_orderdate < date('1995-03-01') + interval('3' month) or and o_orderdate < date('1995-03-01') + interval('3') month or even and o_orderdate < date('1995-03-01') + interval(3 month) still gave me the syntax error. Maybe sqlite3 does not support interval function or am I missing something in its usage? Thanks a lot

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• How to get parent node in Stanford's JavaNLP?

  - by roddik

  Hello. Suppose I have such chunk of a sentence: (NP (NP (DT A) (JJ single) (NN page)) (PP (IN in) (NP (DT a) (NN wiki) (NN website)))) At a certain moment of time I have a reference to (JJ single) and I want to get the NP node binding A single page. If I get it right, that NP is the parent of the node, A and page are its siblings and it has no children (?). When I try to use the .parent() method of a tree, I always get null. The API says that's because the implementation doesn't know how to determine the parent node. Another method of interest is .ancestor(int height, Tree root), but I don't know how to get the root of the node. In both cases, since the parser knows how to indent and group trees, it must know the "parent" tree, right? How can I get it? Thanks

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• Hierarchical data table for JSF2 and RichFaces

  - by Iravanchi

  I'm using RichFaces on my JSF2 application, and I need a way to have something like a tree-column or tree-table. As far as I know, there's no support for such thing in RichFaces. Something's mentioned for RichFaces 4.0, but the priority of this in their plan isn't promising at all, and I don't think that it's going to be included in 4.0. I know there's a tree table available in IceFaces, but I'd rather not add another library to avoid conflicts and learning curve and ... So, I'm looking for the simplest way that I can achieve the same results with minimum efforts, maybe using sub-tables in RichFaces? Any ideas would be appreciated.

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• Vimrc: how to reuse code and definitions for differnt file types?

  - by sixtyfootersdude

  I have defined my own file types using vim. For example I have: .classNotes .reportJotNotes .homework These file types are defined in .vim files: ~/.vim/syntax/homework.vim ~/.vim/syntax/reportJotNotes.vim ~/.vim/syntax/homework.vim Many of these things have several of the same code in them. Ie they all have this for titles: syn region JakeTitle start=+=== + end=+===+ oneline highlight JakeTitle ctermbg=black ctermfg=Yellow syn region JakeMasterTitle start=+==== + end=+====+ oneline highlight JakeMasterTitle cterm=bold term=bold ctermbg=black ctermfg=LightBlue Instead of having this in all three .vim files I would rather have it in one file and then in each file could source it. How can I do this?

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• Git: removing selected commits from repository

  - by xk0der

  I would like to remove selected commits from a linear commit tree, so that the commits do not show in the commit log. My commit tree looks something like: R--A--B--C--D--E--HEAD I would like to remove the B and C commits. So that they do not show in the commit log, but changes from A to D should be preserved. Maybe by introducing a single commit, so that B and C become BC and the tree looks like. R--A--BC--D--E--HEAD Or, ideally, after A comes D directly. D' representing changes from A to B, B to C and C to D. R--A--D'--E--HEAD Is this possible? if yes, how? Some notes that might be helpful: This is a fairly new project so has no branches as of now, hence no merges as well. Side note: It's a personal project, so no, I'm not trying to destroy any evidence :)

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• Creating a MySQL trigger to verify data on another table

  - by Danny Herran

  I am trying to set up a MySQL trigger that does the following: When someone inserts data into databaseA.bills, it verifies if databaseB.bills already has that row, if it doesn't, then it does an additional insert into databaseB.bills. Here is what I have: CREATE TRIGGER ins_bills AFTER INSERT ON databaseA.bills FOR EACH ROW BEGIN IF NOT EXISTS (SELECT 1 FROM databaseB.bills WHERE billNumber=NEW.billNumber) THEN INSERT INTO databaseB.bills (billNumber) VALUES (NEW.billNumber) END IF END;// DELIMITER ; The problem is, I can't create it through mysql console or phpMyAdmin. It returns syntax errors near END IF END, and I am sure it's a delimiter problem. #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'END IF END' at line 6 What am I doing wrong?

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