Using keep-left/right combinator is not working with result converter

Using keep-left/right combinator is not working with result converter

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Using keep-left/right combinator is not working with result converter
Tag : scala , By : eataix
Date : November 29 2020, 04:01 AM

like below fixes the issue Since you didn't insert any parentheses in the chain of ~ and <~, most matched subexpressions are thrown out "with the bathwater" (or rather "with the whitespace and arrows"). Just insert some parentheses.
Here is the general pattern what it should look like:
(irrelevant ~> irrelevant ~> RELEVANT <~ irrelevant <~ irrelevant) ~
(irrelevant ~> RELEVANT <~ irrelevant <~ irrelevant) ~ 
import scala.util.parsing.combinator._
import scala.util.{Either, Left, Right}

case class SubtitleBlock(startTime: String, endTime: String, text: List[String])

object YourParser extends RegexParsers {

  def subtitleHeader: Parser[SubtitleBlock] = {
    (subtitleNumber.? ~> time <~ arrow) ~ 
    time ~
    (opt(textLine) <~ eol)
  } ^^ {
    case startTime ~ endTime ~ _ => SubtitleBlock(startTime, endTime, Nil)

  override val whiteSpace = "[ \t]+".r
  def arrow: Parser[String] = "-->".r
  def subtitleNumber: Parser[String] = "\\d+".r
  def time: Parser[String] = "\\d{2}:\\d{2}:\\d{2}.\\d{3}".r
  def textLine: Parser[String] = ".*".r
  def eol: Parser[String] = "\n".r

  def parseStuff(s: String): scala.util.Either[String, SubtitleBlock] = 
  parseAll(subtitleHeader, s) match {
    case Success(t, _) => scala.util.Right(t)
    case f => scala.util.Left(f.toString)

  def main(args: Array[String]): Unit = {
    val examples: List[String] = List(
      "2 00:00:01.610 --> 00:00:02.620 align:start position:0%\n"
    ) ++ args.map(_ + "\n")

    for (x <- examples) {

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Always discard result for a parser combinator

Tag : scala , By : leorick
Date : March 29 2020, 07:55 AM
should help you out In earlier versions of scala the discard method existed to throw away the results of a parser: , You can simply reference the extra parser result but not use it:
otherParser ~ throwThisAway ~ anotherParser ^^ { case a ~ x ~ b => // eg.: SomeCaseClass(a,b)
otherParser ~ throwThisAway ~ anotherParser ^^ { case a ~ _ ~ b => ...

Haskell parsec: `many` combinator inside an `optional` combinator

Tag : haskell , By : Johannes
Date : March 29 2020, 07:55 AM
this one helps. We can also state this slightly different: c in your parser may only succeed if it's followed by any token, which can be done with a single lookAhead:
myParser = many (a <|> b <|> (c <* (lookAhead anyToken <?> "non C token"))) <* eof

Fixed point combinator and explicit result type

Tag : cpp , By : Brian Cupps
Date : March 29 2020, 07:55 AM
Does that help The rule in [dcl.spec.auto] is:
print(print, {1, {{2, {{8}}}, {3, {{5, {{7}}}, {6}}}, {4}}});

When working with css child combinator on list i'm not getting the result I expected

Tag : html , By : Al Dimond
Date : March 29 2020, 07:55 AM
it should still fix some issue You forgot 2 lines in the html. After that, your style will work fine but it will also change the color of D, E and F because they are on the same level as H.
<aside class="sitemap">
  <ul class="pages">
        <li class="featured">E</li>
    </li> <!-- add this line -->
    <li> <!-- add this line -->
            <li class="featured">I</li>

CSS > combinator not getting result I expected

Tag : css , By : wraith
Date : March 29 2020, 07:55 AM
I wish did fix the issue. The > operator only selects the direct (first gen) children of the element. In the case of color, the child elements of that targeted element inherit that style rule:
#outside>li {
  color: green;
<ul id="outside">


#three>#two {
  color: green;
<div id="three">
  <div id="two">
    <header id="one">
      <footer id="zero">
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