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lexers vs parsers
...sarily have to be of letters. But it
has to be of symbols which are atomic for the language
understood by parser/lexer.
Symbols for the lexer: ASCII characters.
Symbols for the parser: the particular tokens, which are terminal symbols of their grammar.
They analyse these symbols and try to match th...
HTTP 401 - what's an appropriate WWW-Authenticate header value?
...n at the moment has a session timeout value. If the user hasn't interacted for longer than this value, the next page they try to load, they will be prompted to log in.
...
Editing the git commit message in GitHub
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No, this is not directly possible. The hash for every Git commit is also calculated based on the commit message. When you change the commit message, you change the commit hash. If you want to push that commit, you have to force that push (git push -f). But if already s...
Showing commits made directly to a branch, ignoring merges in Git
...o merge back into a principal branch then the easiest thing to do is to perform the merge on a local clone and then just look at the diff with the first parent before publishing the merge.
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What issues should be considered when overriding equals and hashCode in Java?
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The theory (for the language lawyers and the mathematically inclined):
equals() (javadoc) must define an equivalence relation (it must be reflexive, symmetric, and transitive). In addition, it must be consistent (if the objects are not ...
PDO Prepared Inserts multiple rows in single query
...=0, $separator=","){
$result = array();
if($count > 0){
for($x=0; $x<$count; $x++){
$result[] = $text;
}
}
return implode($separator, $result);
}
$pdo->beginTransaction(); // also helps speed up your inserts.
$insert_values = array();
foreach($d...
Embedding SVG into ReactJS
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Update 2016-05-27
As of React v15, support for SVG in React is (close to?) 100% parity with current browser support for SVG (source). You just need to apply some syntax transformations to make it JSX compatible, like you already have to do for HTML (class → classNam...
What's the difference between integer class and numeric class in R
...uped together as "numeric" classes, the 2 most common of which are double (for double precision floating point numbers) and integer. R will automatically convert between the numeric classes when needed, so for the most part it does not matter to the casual user whether the number 3 is currently sto...
Polymorphism with gson
...eAdapter. And you certainly don't need to do instanceofs or write adapters for the derived classes: just one adapter for the base class or interface, provided of course that you are happy with the default serialization of the derived classes. Anyway, here's the code (package and imports removed) (al...
Escaping keyword-like column names in Postgres
...table has the name year , how should look INSERT query to set the value for that column?
3 Answers
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