RogerBW's Blog

The Weekly Challenge 181: Hot Sentence 08 September 2022

I’ve been doing the Weekly Challenges. The latest involved string splitting and data sorting. (Note that this is open until 11 September 2022.)

Task 1: Sentence Order

You are given a paragraph.

Write a script to order each sentence alphanumerically and print the whole paragraph.

I felt a strong lack of enthusiasm about this one – there's a certain amount of "why would anyone ever want to do this" – but I wrote it in Perl and Raku anyway. It ended up falling into multiple stages: wrapping the paragraph into a single string, splitting sentences, splitting words (and stripping punctuation at ends of words but not in mid-word), sorting, composing the output and then wrapping it.

Perl:

saywrap(reorder("
All he could think about was how it would all end. There was
still a bit of uncertainty in the equation, but the basics
were there for anyone to see. No matter how much he tried to
see the positive, it wasn't anywhere to be seen. The end was
coming and it wasn't going to be pretty.
"));

sub reorder($para0) {

Trim leading and trailing spaces.

  (my $para = $para0) =~ s/^\s*(.*?)\s*$/$1/;

Make single line.

  $para =~ s/\n/ /g;

Remove any multiple spaces

  $para =~ s/\s{2,}/ /g;
  my @o;

Split sentences by terminal . ! ?

  foreach my $s0 (split /[.?!] /, $para) {
    if ($s0) {
      my $s = $s0;

Remove trailing punctuation.

      $s =~ s/[^a-z]\s/ /gi;

And . at end of sentence.

      $s =~ s/\.$//g;

Trim leading/trailing spaces.

      $s =~ s/^\s*(.*?)\s*$/$1/;

Compress multiple spaces.

      $s =~ s/\s{2,}/ /g;

Split and sort.

      my @w = sort {lc($a) cmp lc($b)} split ' ',$s;

Reassemble.

      push @o,join(' ',@w) . '.';
    }
  }
  return join(' ',@o);
}

For the wrapper I'd normally use Text::Wrap but I had to write the algorithm anyway for the Raku version. Basically, scan backwards from the line length looking for a space.

sub saywrap($p0) {
  my $p = $p0;
  my $ll = 72;
  while (length($p) >= $ll) {
    my $c = $ll;
    while ($c > 0) {
      if (substr($p, $c, 1) eq ' ') {
        print substr($p, 0, $c),"\n";
        $p = substr($p, $c+1);
        $c = -1;
        last;
      }
      $c--;
    }
    if ($c == 0) {
      print substr($p, 0, $ll-1),"-\n";
      $p = substr($p, $ll);
    }
  }
  if (length($p) > 0) {
    print $p,"\n";
  }
}

Task 2: Hot Day

You are given file with daily temperature record in random order.

Write a script to find out days hotter than previous day.

Most languages make some sort of CSV parser available which I'd use for a real problem. But basically this is a matter of sorting items into order, then processing the series.

Python:

t = dict()

Read the file, store a hash of (date-string, temperature)

fh = open('temperature.txt','r')
for ll in fh:
  line = ll.rstrip()
  l = line.split(",")
  t[l[0].strip()] = int(l[1].strip())

Then go through the sorted date-strings and print the ones for which temperature is higher than the previous entry.

lt = 999
for k in sorted(t.keys()):
  if t[k] > lt:
    print(k)
  lt = t[k]

Full code on github.

Add A Comment

Your Name
Your Email
Your Comment

Your submission will be ignored if any field is left blank, but your email address will not be displayed. Comments will be processed through markdown.

Search
Archive
Tags 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 3d printing action aeronautics aikakirja anecdote animation anime army astronomy audio audio tech aviation base commerce battletech beer boardgaming book of the week bookmonth chain of command children chris chronicle church of no redeeming virtues cold war comedy computing contemporary cornish smuggler cosmic encounter coup covid-19 crime cycling dead of winter doctor who documentary drama driving drone ecchi economics espionage essen 2015 essen 2016 essen 2017 essen 2018 essen 2019 essen 2022 existential risk falklands war fandom fanfic fantasy feminism film firefly first world war flash point flight simulation food garmin drive gazebo genesys geocaching geodata gin gkp gurps gurps 101 gus harpoon historical history horror hugo 2014 hugo 2015 hugo 2016 hugo 2017 hugo 2018 hugo 2019 hugo 2020 hugo 2022 hugo-nebula reread in brief avoid instrumented life javascript julian simpson julie enfield kickstarter kotlin learn to play leaving earth linux liquor lovecraftiana lua mecha men with beards museum music mystery naval noir non-fiction one for the brow opera parody paul temple perl perl weekly challenge photography podcast politics postscript powers prediction privacy project woolsack pyracantha python quantum rail raku ranting raspberry pi reading reading boardgames social real life restaurant reviews romance rpg a day rpgs ruby rust science fiction scythe second world war security shipwreck simutrans smartphone south atlantic war squaddies stationery steampunk stuarts suburbia superheroes suspense television the resistance the weekly challenge thirsty meeples thriller tin soldier torg toys trailers travel type 26 type 31 type 45 vietnam war war wargaming weather wives and sweethearts writing about writing x-wing young adult
Special All book reviews, All film reviews
Produced by aikakirja v0.1