From 7525905ca57bbd425f96a33768e3f6777ba86f7a Mon Sep 17 00:00:00 2001
From: Michael Denkowski <mdenkows@cs.cmu.edu>
Date: Wed, 4 Sep 2013 15:14:16 -0700
Subject: Detokenizer

---
 corpus/untok.pl | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100755 corpus/untok.pl

diff --git a/corpus/untok.pl b/corpus/untok.pl
new file mode 100755
index 00000000..723e78cb
--- /dev/null
+++ b/corpus/untok.pl
@@ -0,0 +1,63 @@
+#!/usr/bin/perl -w
+
+use IO::Handle;
+STDOUT->autoflush(1);
+
+while (<>) {
+  $output = "";
+  @tokens = split;
+  $lspace = 0;
+  $qflag = 0;
+  for ($i=0; $i<=$#tokens; $i++) {
+    $token = $tokens[$i];
+    $prev = $next = "";
+    $rspace = 1;
+    if ($i > 0) {
+      $prev = $tokens[$i-1];
+    }
+    if ($i < $#tokens) {
+      $next = $tokens[$i+1];
+    }
+
+    # possessives join to the left
+    if ($token =~ /^(n't|'(s|m|re|ll|ve|d))$/) {
+      $lspace = 0;
+    } elsif ($token eq "'" && $prev =~ /s$/) {
+      $lspace = 0;
+
+    # hyphen only when a hyphen, not a dash
+    } elsif ($token eq "-" && $prev =~ /[A-Za-z0-9]$/ && $next =~ /^[A-Za-z0-9]/) {
+      $lspace = $rspace = 0;
+
+    # quote marks alternate
+    } elsif ($token eq '"') {
+      if ($qflag) {
+        $lspace = 0;
+      } else {
+        $rspace = 0;
+      }
+      $qflag = !$qflag;
+
+    # period joins on both sides when a decimal point
+    } elsif ($token eq "." && $prev =~ /\d$/ && $next =~ /\d$/) {
+      $lspace = $rspace = 0;
+
+    # Left joiners
+    } elsif ($token =~ /^[.,:;?!%)\]]$/) {
+      $lspace = 0;
+    # Right joiners
+    } elsif ($token =~ /^[$(\[]$/) {
+      $rspace = 0;
+    # Joiners on both sides
+    } elsif ($token =~ /^[\/]$/) {
+      $lspace = $rspace = 0;
+    }
+
+    if ($lspace) {
+      $output .= " ";
+    }
+    $output .= $token;
+    $lspace = $rspace;
+  }
+  print "$output\n";
+}
-- 
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