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How would you go about parsing Markdown? [closed]
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Flex is really only half the parser; once you have tokenized the input, you need to determine what the tokens mean. This is what a parser generator is for. There are lots of them. ("Parser combinator", "recursive-descent" and "LALR(1)" are key words to google for.)
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What is exactly the base pointer and stack pointer? To what do they point?
... ; Create new frame pointer pointing to current stack top
sub esp, 20 ; allocate 20 bytes worth of locals on stack.
Then later in the function you may have code like (presuming both local variables are 4 bytes)
mov [ebp-4], eax ; Store eax in first local
mov ebx, [ebp - 8] ; Load ebx from ...
Convert a binary NodeJS Buffer to JavaScript ArrayBuffer
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From ArrayBuffer to Buffer:
function toBuffer(ab) {
var buf = Buffer.alloc(ab.byteLength);
var view = new Uint8Array(ab);
for (var i = 0; i < buf.length; ++i) {
buf[i] = view[i];
}
return buf;
}
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The definitive guide to form-based website authentication [closed]
...one of the most common pitfalls, DO NOT STORE THE PERSISTENT LOGIN COOKIE (TOKEN) IN YOUR DATABASE, ONLY A HASH OF IT! The login token is Password Equivalent, so if an attacker got their hands on your database, they could use the tokens to log in to any account, just as if they were cleartext login-...
What's the difference between VARCHAR and CHAR?
...n hold is 255 characters.
It's 50% faster than VARCHAR.
Uses static memory allocation.
VARCHAR
Used to store variable length alphanumeric data.
The maximum this data type can hold is up to
Pre-MySQL 5.0.3: 255 characters.
Post-MySQL 5.0.3: 65,535 characters shared for the row.
It's slower tha...
Virtual Memory Usage from Java under Linux, too much memory used
...is last item is either a file or "anon", which indicates a block of memory allocated via mmap.
Starting from the top, we have
The JVM loader (ie, the program that gets run when you type java). This is very small; all it does is load in the shared libraries where the real JVM code is stored.
A bun...
How can I send mail from an iPhone application
...:
MFMailComposeViewController* controller = [[MFMailComposeViewController alloc] init];
controller.mailComposeDelegate = self;
[controller setSubject:@"My Subject"];
[controller setMessageBody:@"Hello there." isHTML:NO];
if (controller) [self presentModalViewController:controller animated:YES];
[c...
Dynamically replace the contents of a C# method?
...they have some - for instance, '.call' has one argument: the called method token, and '.pop' has none)
Correspondence between IL codes and bytes you find in the returned array may be found using OpCodes.YourOpCode.Value (which is the real opcode byte value as saved in your assembly)
Arguments append...
Python - Create a list with initial capacity
...bject %d" % ( i, )
result.append(message)
return result
def doAllocate( size=10000 ):
result=size*[None]
for i in range(size):
message= "some unique object %d" % ( i, )
result[i]= message
return result
Results. (evaluate each function 144 times and average ...
Structs versus classes
...ject known to be alive as alive. The object on the stack can refer to heap-allocated objects that need to be kept alive, so the GC has to treat stack objects like living heap-allocated objects for the purposes of determining the live set. But obviously they are not treated as "live objects" for the...