From e63434f437f0017c08b1493e7e8d27a4cdc594ae Mon Sep 17 00:00:00 2001
From: Tom MacWright <tom@macwright.org>
Date: Wed, 30 Jan 2013 17:41:06 -0500
Subject: [PATCH] Rename, titles, edit distance

---
 index.html                          |  2 +-
 js/id/{presets.js => presetdata.js} |  6 ++++++
 js/id/util.js                       | 20 ++++++++++++++++++++
 presets/presets.json                |  2 ++
 4 files changed, 29 insertions(+), 1 deletion(-)
 rename js/id/{presets.js => presetdata.js} (69%)

diff --git a/index.html b/index.html
index 5caa49254..438b54e90 100644
--- a/index.html
+++ b/index.html
@@ -31,7 +31,7 @@
         <script src='js/id/id.js'></script>
         <script src='js/id/util.js'></script>
         <script src='js/id/oauth.js'></script>
-        <script src='js/id/presets.js'></script>
+        <script src='js/id/presetdata.js'></script>
         <script src='js/id/services/taginfo.js'></script>
 
         <script src="js/id/geo.js"></script>
diff --git a/js/id/presets.js b/js/id/presetdata.js
similarity index 69%
rename from js/id/presets.js
rename to js/id/presetdata.js
index 694f7cae4..df07e732b 100644
--- a/js/id/presets.js
+++ b/js/id/presetdata.js
@@ -8,6 +8,12 @@ iD.presetData = function() {
         return presets;
     };
 
+    presets.search = function(str) {
+        var edits = _.sortBydata.map(function(d) {
+            return iD.util.editDistance(d.title, str);
+        });
+    };
+
     presets.match = function(entity) {
         return data.filter(function(d) {
             return _.contains(d.match.type, entity.type);
diff --git a/js/id/util.js b/js/id/util.js
index da31a162b..fac92fba0 100644
--- a/js/id/util.js
+++ b/js/id/util.js
@@ -74,3 +74,23 @@ iD.util.getStyle = function(selector) {
         }
     }
 };
+
+iD.util.editDistance = function(a, b) {
+    if (a.length === 0) return b.length;
+    if (b.length === 0) return a.length;
+    var matrix = [];
+    for (var i = 0; i <= b.length; i++) { matrix[i] = [i]; }
+    for (var j = 0; j <= a.length; j++) { matrix[0][j] = j; }
+    for (i = 1; i <= b.length; i++) {
+        for (j = 1; j <= a.length; j++) {
+            if (b.charAt(i-1) == a.charAt(j-1)) {
+                matrix[i][j] = matrix[i-1][j-1];
+            } else {
+                matrix[i][j] = Math.min(matrix[i-1][j-1] + 1, // substitution
+                    Math.min(matrix[i][j-1] + 1, // insertion
+                    matrix[i-1][j] + 1)); // deletion
+            }
+        }
+    }
+    return matrix[b.length][a.length];
+};
diff --git a/presets/presets.json b/presets/presets.json
index af7efaaa5..a4f25bd42 100644
--- a/presets/presets.json
+++ b/presets/presets.json
@@ -1,5 +1,6 @@
 [
     {
+        "title": "Highway",
         "name": "highway",
         "match": {
             "type": ["line"],
@@ -17,6 +18,7 @@
         ]
     },
     {
+        "title": "Cafe",
         "name": "cafe",
         "match": {
             "type": ["node", "area"],