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How do I turn this regex into a Megaparsec parser without making a mess?

By : Zach R
Date : September 15 2020, 07:00 PM
I wish this helpful for you Without reading carefully, I guess the bit that's giving you trouble is this part:
code :
sepBy (many (noneOf ",")) (string ",")
slashPath = string "/" <++> path
path = string "baz=" <|> (many (noneOf "=/") <++> slashPath)
(<++>) = liftA2 (++)

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FParsec combinator to turn Parser<char,_> until Parser<string,_>?

By : ajolson1964
Date : March 29 2020, 07:55 AM
Hope that helps The |>> operator is what you're looking for. I quote the FParsec reference:
code :
val (|>>): Parser<'a,'u> -> ('a -> 'b) -> Parser<'b,'u> 
let jnumber =
    let neg = stringReturn "-" -1 <|> preturn 1
    let digit = satisfy (isDigit)
    let digit19 = satisfy (fun c -> isDigit c && c <> '0')
    let digits = many1 digit
    (digit |>> string) (* The operator is used here *)
    <|> (many1Satisfy2 (fun c -> isDigit c && c <> '0') isDigit)

regex issue in making a markdown parser

By : wwhite
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further You could make sure to only match the wanted number of hash signs by making sure that the first character of the heading text isn't a hash sign. This can be done by using [^#] like this:
code :
string = re.sub('^#{1}([^#].*)$', '<h1>\\1</h1>', string, flags=re.MULTILINE)
string = re.sub('^#{2}([^#].*)$', '<h2>\\1</h2>', string, flags=re.MULTILINE)

How can I turn this mess in a single loop?

By : naren vivek
Date : March 29 2020, 07:55 AM
seems to work fine I want to change this long piece of code in a single loop: Please help me. , You can use .forEach():
code :
itemAll.forEach(function(item, i) {
  item.addEventListener("click", klick.bind(undefined, i));

How to use async and await to turn an active (Pull-) Parser into a passive Push-Parser?

By : Elm Ahdy
Date : March 29 2020, 07:55 AM
Does that help for your efforts. What I'm trying to achieve here is an Inversion of Control Flow and that is what yield and also async/await are made for. They build a State machine that can return directly after the 'yield' or 'await' Command. 'yield' returns Values, 'await' retrieves Values, so using these Constructs you can switch Control Flow both in Read-Scenarios as well as in Write-Scenarios. In this case I can provide a Task-Factory that creates a new Task for each Character I want to consume:
code :
public class TaskFactory<T> {
    public TaskCompletionSource<T> Task { get; private set; }

    public Task<T> GetTask() {
        Task = new TaskCompletionSource<T>();
        return Task.Task;
var completion = new TaskFactory<char>();
var isFound = searcher.IsFound(completion.GetTask);
foreach(var chr in hayStack) {
    if (isFound.IsCompleted) {
return isFound.Result;

My Megaparsec parser gets stuck and ghci debugging isn't helping either

By : Anuoluwapo Phillips
Date : March 29 2020, 07:55 AM
it fixes the issue The sepEndBy sourceline scn will keep iterating as long as it can get the sourceLine and scn parsers to match. However, both of those parsers can complete successfully without consuming any input, so they will always match. Since all of the branches of sourceLine have a try, any parse error will cause the parser to back off and just match an infinite number of empty source lines. Even without a parse error, reaching eof will produce an infinite number of source lines.
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