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|
#!/usr/bin/perl
use strict;
use warnings;
use Storable qw(retrieve);
use Encode qw(decode_utf8);
use HTML::Escape qw(escape_html);
use Time::HiRes qw(gettimeofday tv_interval);
use BSD::Resource;
use Sys::Mmap;
my $sa_file = 'sa.bin'; # Suffix Array index
my $cp_file = 'corpus.bin'; # Raw text corpus
my $map_file = 'file_map.dat'; # File metadata
# 1. Start Benchmark Timer
my $start_time = [gettimeofday];
my $files_read = 0; # Track IO Activity
# Decode search text
my $search_text = '';
if (($ENV{QUERY_STRING} || '') =~ /^q=([^&]*)/) {
$search_text = decode_utf8($1 // "");
$search_text =~ s/\P{Print}//g;
$search_text = substr($search_text, 0, 64);
$search_text =~ s/^\s+|\s+$//g;
}
# We search using lowercase for the case-insensitive index
my $query = lc($search_text);
my $query_len = length($query);
my @results;
if ($query_len >= 3 && -f 'sa.bin' && -f 'corpus.bin') {
open(my $fh_sa, '<', $sa_file) or die $!;
open(my $fh_cp, '<', $cp_file) or die $!;
binmode($fh_sa);
binmode($fh_cp);
# Memory map files
my ($sa_mapped, $cp_mapped);
mmap($sa_mapped, 0, PROT_READ, MAP_SHARED, $fh_sa) or die "Could not map SA: $!";
mmap($cp_mapped, 0, PROT_READ, MAP_SHARED, $fh_cp) or die "Could not map Corpus: $!";
my $file_map = retrieve($map_file);
$files_read += 3;
my $total_suffixes = (-s $sa_file) / 4;
# Range Search: Find Left and Right boundaries
my ($low, $high) = (0, $total_suffixes - 1);
my $first_hit = -1;
while ($low <= $high) {
my $mid = int(($low + $high) / 2);
my $off = unpack("L", substr($sa_mapped, $mid * 4, 4));
my $text = substr($cp_mapped, $off, $query_len);
my $cmp = $text cmp $query;
if ($cmp >= 0) {
$first_hit = $mid if $cmp == 0;
$high = $mid - 1;
} else {
$low = $mid + 1;
}
}
if ($first_hit != -1) {
($low, $high) = ($first_hit, $total_suffixes - 1);
my $last_hit = $first_hit;
while ($low <= $high) {
my $mid = int(($low + $high) / 2);
my $off = unpack("L", substr($sa_mapped, $mid * 4, 4));
my $text = substr($cp_mapped, $off, $query_len);
if (($text cmp $query) <= 0) {
$last_hit = $mid if $text eq $query;
$low = $mid + 1;
} else {
$high = $mid - 1;
}
}
# Collect unique file results
my %seen;
for my $i ($first_hit .. $last_hit) {
my $offset = unpack("L", substr($sa_mapped, $i * 4, 4));
foreach my $m (@$file_map) {
if ($offset >= $m->{start} && $offset < $m->{end}) {
if (!$seen{$m->{path}}++) {
# Capture more than 50 chars for trimming
my $snip_start = ($offset - 30 < $m->{start}) ? $m->{start} : $offset - 30;
my $max_len = $m->{end} - $snip_start;
my $read_len = ($max_len > 120) ? 120 : $max_len;
my $raw_snip = substr($cp_mapped, $snip_start, $read_len);
my $snippet = decode_utf8($raw_snip, Encode::FB_QUIET) // $raw_snip;
$snippet =~ s/\s+/ /g; # Normalize whitespace
# Trim start: Partial word removal
if ($snip_start > $m->{start}) {
$snippet =~ s/^[^\s]*\s//;
}
# Trim end: Length limit and partial word removal
my $has_more = 0;
if (length($snippet) > 50) {
$snippet = substr($snippet, 0, 50);
$has_more = 1 if $snippet =~ s/\s+[^\s]*$//;
}
elsif ($snip_start + $read_len < $m->{end}) {
# This check handles snippets that are naturally short but
# there's still more text in the article we didn't read
$has_more = 1;
}
# Cleanup & capitalize
$snippet = ucfirst($snippet);
$snippet = escape_html($snippet) . ($has_more ? "..." : "");
my $clean_path = $m->{path};
$clean_path =~ s|^\.\./_site/||;
push @results, {
path => $clean_path,
title => $m->{title},,
snippet => $snippet
};
}
last;
}
}
last if scalar @results >= 1000;
}
}
close($fh_sa);
close($fh_cp);
}
# 2. Calculate Metrics
my $end_time = [gettimeofday];
my $elapsed = tv_interval($start_time, $end_time);
my $rusage = getrusage();
my $user_cpu = $rusage->utime;
my $system_cpu = $rusage->stime;
my $max_rss = $rusage->maxrss;
# 3. Output
print "Content-Type: text/html\n\n";
my $list;
if ($search_text eq '') {
$list = "<p>Please enter a search term above.</p>";
} elsif (@results == 0) {
$list = "<p>No results found for \"<b>" . escape_html($search_text) . "</b>\".</p>";
} else {
$list = "<ul>";
foreach my $res (@results) {
$list .= "<li><a href=\"/$res->{path}\">$res->{title}</a><br><small>$res->{snippet}</small></li>";
}
$list .= "</ul>";
}
my $safe_search_text = escape_html($search_text);
my $year = (localtime)[5] + 1900;
print <<"HTML";
<!DOCTYPE html>
<html lang="en-us">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Search</title>
<link rel="stylesheet" href="/assets/css/main.css">
<link rel="stylesheet" href="/assets/css/skeleton.css">
</head>
<body>
<div id="nav-container" class="container">
<ul id="navlist" class="left">
<li><a href="/" class="link-decor-none">hme</a></li>
<li><a href="/log/" class="link-decor-none">log</a></li>
<li><a href="/projects/" class="link-decor-none">poc</a></li>
<li><a href="/about/" class="link-decor-none">abt</a></li>
<li class="active"><a href="/cgi-bin/find.cgi" class="link-decor-none">sws</a></li>
<li><a href="/feed.xml" class="link-decor-none">rss</a></li>
</ul>
</div>
<main class="container" id="main">
<div class="container">
<h2>Search</h2>
<form action="" method="GET">
<input id="search-box" type="text" name="q" value="$safe_search_text">
<input id="search-btn" type="submit" value="Search">
</form>
$list
<div style="background: #f4f4f4; padding: 10px; border-radius: 5px; font-family: monospace; font-size: 0.85em; margin-top: 20px; border: 1px solid #ddd;">
<strong>Performance Metrics:</strong><br>
Total Time: @{[ sprintf("%.4f", $elapsed) ]} seconds<br>
User CPU: $user_cpu s<br>
System CPU: $system_cpu s<br>
Peak RAM: $max_rss KB<br>
Files Read: $files_read (IO Activity)
</div>
</div>
</main>
<div class="footer">
<div class="container">
<div class="twelve columns right container-2">
<p id="footer-text">© ASCIIMX - $year</p>
</div>
</div>
</div>
</body>
</html>
HTML
|
