From 5144a0d26ccafc5a3f243a7828ea9f5b9717c352 Mon Sep 17 00:00:00 2001
From: Luigi Pinca <luigipinca@gmail.com>
Date: Thu, 4 Oct 2012 15:24:01 +0200
Subject: [PATCH] improved matching of featured artists

---
 lib/match.js | 66 +++++++++++++++++++++++++---------------------------
 lib/room.js  | 28 +++++++++++-----------
 2 files changed, 47 insertions(+), 47 deletions(-)

diff --git a/lib/match.js b/lib/match.js
index 196c6ca..a827441 100644
--- a/lib/match.js
+++ b/lib/match.js
@@ -6,6 +6,7 @@
  * See Algorithms on strings, trees, and sequences: computer science and computational biology.
  * Cambridge, UK: Cambridge University Press. pp 263-264. ISBN 0-521-58519-8.
  */
+
 var checkDistance = function(s1, s2, k) {
     if (k === 0) {
         return s1 === s2;
@@ -45,7 +46,7 @@ var checkDistance = function(s1, s2, k) {
 };
 
 /**
- * Return `amatch` function.
+ * Expose `amatch` function.
  */
 
 module.exports = function(allowederrors) {
@@ -61,76 +62,73 @@ module.exports = function(allowederrors) {
             return true;
         }
 
-        var splitted, trimmed;
-
         // Ignore dots
-        if (subject.match(/\./) && 
-            checkDistance(subject.replace(/\./g, ""), guess, threshold)) {
-            return true;
-        }
-        // Ignore commas
-        if (subject.match(/,/) && 
-            checkDistance(subject.replace(/,/g, ""), guess, threshold)) {
+        if (/\./.test(subject) && 
+            checkDistance(subject.replace(/\./g, ''), guess, threshold)) {
             return true;
         }
         // Ignore dashes
-        if (subject.match(/\-/) && 
-            checkDistance(subject.replace(/\-/g, ""), guess, threshold)) {
+        if (/\-/.test(subject) && 
+            checkDistance(subject.replace(/\-/g, ''), guess, threshold)) {
             return true;
         }
         // Allow to write "and" in place of "+"
-        if (subject.match(/\+/) && 
-            checkDistance(subject.replace(/\+/, "and"), guess, threshold)) {
+        if (/\+/.test(subject) && 
+            checkDistance(subject.replace(/\+/, 'and'), guess, threshold)) {
+            return true;
+        }
+        // Allow to write "and" in place of " & "
+        if (/ & /.test(subject) && !/\(/.test(subject) &&
+            checkDistance(subject.replace(/ & /, ' and '), guess, threshold)) {
             return true;
         }
 
         if (enableartistrules) {
             // Ignore "the" at the beginning of artist name
-            if (subject.match(/^the /)) {
-                var nothe = subject.replace(/^the /, "");
+            if (/^the /.test(subject)) {
+                var nothe = subject.replace(/^the /, '');
                 if (checkDistance(nothe, guess, threshold)) {
                     return true;
                 }
-                if (nothe.match(/jimi hendrix experience/) && 
-                    checkDistance(nothe.replace(/ experience/, ""), guess, threshold)) {
+                if (/jimi hendrix experience/.test(nothe) && 
+                    checkDistance(nothe.replace(/ experience/, ''), guess, threshold)) {
                     return true;
                 }
             }
-            // Split artist name on "&" (artist name can be composed by more names)
-            splitted = subject.split("&");
+            // Split artist name on " & " and ", " (artist name can be composed by more names)
+            var splitted = subject.split(/ & |, /);
             if (splitted.length !== 1) {
                 for (var i=0; i<splitted.length; i++) {
-                    trimmed = splitted[i].replace(/^ +/, "").replace(/ +$/, "");
-                    if (checkDistance(trimmed, guess, threshold)) {
+                    if (checkDistance(splitted[i], guess, threshold)) {
                         return true;
                     }
-                    if (trimmed.match(/^the /) && 
-                        checkDistance(trimmed.replace(/^the /, ""), guess, threshold)) {
+                    if (/^the /.test(splitted[i]) && 
+                        checkDistance(splitted[i].replace(/^the /, ''), guess, threshold)) {
                         return true;
                     }
                 }
             }
         }
         else {
-            // Allow to write "and" in place of "&"
-            if (subject.match(/ & /) && !subject.match(/\(/) &&
-                checkDistance(subject.replace(/ & /, " and "), guess, threshold)) {
+            // Ignore commas
+            if (/,/.test(subject) && 
+                checkDistance(subject.replace(/,/g, ''), guess, threshold)) {
                 return true;
             }
             // Ignore additional info e.g. "(Love Theme from Titanic)"
-            if (subject.match(/\(.+\)\??(?: \[.+\])?/)) {
-                var normalized = subject.replace(/\(.+\)\??(?: \[.+\])?/, "")
-                                        .replace(/^ +/, "").replace(/ +$/, "");
+            if (/\(.+\)\??(?: \[.+\])?/.test(subject)) {
+                var normalized = subject.replace(/\(.+\)\??(?: \[.+\])?/, '')
+                                        .replace(/^ +/, '').replace(/ +$/, '');
                 if (checkDistance(normalized, guess, threshold)) {
                     return true;
                 }
-                if (normalized.match(/ & /) && 
-                    checkDistance(normalized.replace(/ & /, " and "), guess, threshold)) {
+                if (/ & /.test(normalized) && 
+                    checkDistance(normalized.replace(/ & /, ' and '), guess, threshold)) {
                     return true;
                 }
             }
-            if (subject.match(/, [pP]t\. [0-9]$/) && 
-                checkDistance(subject.replace(/, [pP]t\. [0-9]$/, ""), guess, threshold)) {
+            if (/, [pP]t\. [0-9]$/.test(subject) && 
+                checkDistance(subject.replace(/, [pP]t\. [0-9]$/, ''), guess, threshold)) {
                 return true;
             }
         }
diff --git a/lib/room.js b/lib/room.js
index 52dea95..78ba92c 100644
--- a/lib/room.js
+++ b/lib/room.js
@@ -1,5 +1,5 @@
 /**
- * Return the `Room` class
+ * Expose the `Room` class.
  */
 
 module.exports = function(params) {
@@ -24,17 +24,18 @@ module.exports = function(params) {
     function Room(roomname) {
 
         var allowedguess = false
-            , artistlcase
+            , artist // Artists in lowercase
             , artistName
             , artworkUrl
             , collectionName
+            , feat // Featured artists
             , finishline = 1
             , playedtracks = [] // The list of already played songs
             , previewUrl
             , songcounter = 0
             , songtimeleft // Milliseconds
             , status
-            , tracklcase
+            , title // Title in lowercase
             , trackName
             , trackscount = 0
             , trackViewUrl
@@ -137,8 +138,8 @@ module.exports = function(params) {
             }
             // Censor answers from chat
             var msglcase = msg.toLowerCase();
-            if (allowedguess && (amatch(artistlcase, msglcase, true) || 
-                                amatch(tracklcase, msglcase))) {
+            if (allowedguess && (amatch(artist, msglcase, true) ||
+                    (feat && amatch(feat, msglcase, true)) || amatch(title, msglcase))) {
                 var notice = 'You are probably right, but you have to use the box above.';
                 socket.emit('chatmsg', notice, 'binb', socket.nickname);
                 return;
@@ -219,12 +220,12 @@ module.exports = function(params) {
         this.guess = function(socket, guess) {
             if (allowedguess) {
                 if (!usersData[socket.nickname].matched) { // No track no artist
-                    if ((artistlcase === tracklcase) && amatch(tracklcase, guess, true)) {
+                    if ((artist === title) && amatch(title, guess, true)) {
                         addPointsAndStats(socket.nickname, true);
                         socket.emit('bothmatched');
                         io.sockets.in(roomname).emit('updateusers', usersData);
                     }
-                    else if (amatch(artistlcase, guess, true)) {
+                    else if (amatch(artist, guess, true) || (feat && amatch(feat, guess, true))) {
                         usersData[socket.nickname].roundpoints++;
                         usersData[socket.nickname].points++;
                         usersData[socket.nickname].matched = 'artist';
@@ -235,7 +236,7 @@ module.exports = function(params) {
                             collectStats(socket.nickname, stats);
                         }
                     }
-                    else if (amatch(tracklcase, guess)) {
+                    else if (amatch(title, guess)) {
                         usersData[socket.nickname].roundpoints++;
                         usersData[socket.nickname].points++;
                         usersData[socket.nickname].matched = 'title';
@@ -252,7 +253,7 @@ module.exports = function(params) {
                 }
                 else if (usersData[socket.nickname].matched !== 'both') { // Track or artist
                     if (usersData[socket.nickname].matched === 'artist') {
-                        if (amatch(tracklcase, guess)) {
+                        if (amatch(title, guess)) {
                             addPointsAndStats(socket.nickname, false);
                             socket.emit('bothmatched');
                             io.sockets.in(roomname).emit('updateusers', usersData);
@@ -262,7 +263,7 @@ module.exports = function(params) {
                         }
                     }
                     else {
-                        if (amatch(artistlcase, guess, true)) {
+                        if (amatch(artist, guess, true) || (feat && amatch(feat, guess, true))) {
                             addPointsAndStats(socket.nickname, false);
                             socket.emit('bothmatched');
                             io.sockets.in(roomname).emit('updateusers', usersData);
@@ -306,11 +307,12 @@ module.exports = function(params) {
                 }
                 playedtracks.push(res);
                 songsdb.hmget('song:'+res, 'artistName', 'trackName', 'collectionName', 'previewUrl',
-                                'artworkUrl60', 'trackViewUrl', function(e, replies) {
+                        'artworkUrl60', 'trackViewUrl', function(e, replies) {
                     artistName = replies[0];
-                    artistlcase = artistName.toLowerCase();
+                    artist = artistName.toLowerCase();
                     trackName = replies[1];
-                    tracklcase = trackName.toLowerCase();
+                    title = trackName.toLowerCase();
+                    feat = /feat\. (.+?)[)\]]/.test(title) ? RegExp.$1 : null;
                     collectionName = replies[2];
                     previewUrl = replies[3];
                     artworkUrl = replies[4];
-- 
2.54.0