From f125e1ec13d2f7a6478d2cdffd23e0fafcdf46b0 Mon Sep 17 00:00:00 2001
From: jluehrs2 <jluehrs2@uiuc.edu>
Date: Thu, 31 Jan 2008 16:31:52 -0500
Subject: add a caching option to random_word and is_word

---
 lib/Games/Word.pm | 42 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 40 insertions(+), 2 deletions(-)

diff --git a/lib/Games/Word.pm b/lib/Games/Word.pm
index 88d3d56..9ec9403 100644
--- a/lib/Games/Word.pm
+++ b/lib/Games/Word.pm
@@ -11,12 +11,36 @@ use Math::Combinatorics qw/factorial/;
 use Test::Deep::NoTest;
 
 my $word_list = '';
+my $cache = 1;
+my %words = ();
+my @words = ();
 
 sub set_word_list {
     $word_list = shift;
+    die "Can't read word list: $word_list" unless -r $word_list;
+    die "Empty word list: $word_list" unless -s $word_list;
+    my %args = (cache => 1, @_);
+    if ($args{cache}) {
+        open my $fh, $word_list or die "Opening $word_list failed";
+        for (<$fh>) {
+            chomp;
+            $words{$_} = 1;
+        }
+        @words = keys %words;
+        $cache = 1;
+    }
+    else {
+        $cache = 0;
+    }
+
 }
 
-sub random_word {
+sub _random_word_cache {
+    die "No words in word list" unless keys %words;
+    return $words[int(rand(@words))];
+}
+
+sub _random_word_nocache {
     my $word;
 
     open my $fh, '<', $word_list or die "Opening $word_list failed";
@@ -28,7 +52,16 @@ sub random_word {
     return $word;
 }
 
-sub is_word {
+sub random_word {
+    return _random_word_cache if $cache;
+    return _random_word_nocache;
+}
+
+sub _is_word_cache {
+    return $words{$_[0]};
+}
+
+sub _is_word_nocache {
     my $word = shift;
 
     open my $fh, '<', $word_list
@@ -41,6 +74,11 @@ sub is_word {
     return 0;
 }
 
+sub is_word {
+    return _is_word_cache(@_) if $cache;
+    return _is_word_nocache(@_);
+}
+
 sub random_permutation {
     my $word = shift;
     return '' if $word eq '';
-- 
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