refs #27: fix 'failed to load problem' error

* leetcode.com has changed the html thus we have to update accordingly

Signed-off-by: Eric Wang <skygragon@gmail.com>

Author: skygragon

lib/leetcode_client.js

@@ -133,16 +133,17 @@ leetcodeClient.getProblem = function(problem, cb) {
     problem.desc = $('meta[property="og:description"]').attr('content');
     problem.desc = he.decode(problem.desc);
 
-    var raw = $('div[ng-controller="AceCtrl as aceCtrl"]').attr('ng-init');
-    if (!raw)
+    var pageData;
+    var r = /(var pageData[^;]+;)/m;
+    var result = body.match(r);
+    if (!result)
       return cb('failed to load' + (problem.locked ? ' locked ' : ' ') +
                 'problem!');
 
-    raw = raw.replace(/\n/g, '');
-    var args = eval(raw);
-    problem.templates = args[0];
-    problem.testcase = args[8];
-    problem.testable = args[10];
+    eval(result[1]);
+    problem.templates = pageData.codeDefinition;
+    problem.testcase = pageData.sampleTestCase;
+    problem.testable = pageData.enableRunCode;
 
     return cb(null, problem);
   });

test/mock/find-the-difference.html.20170424

@@ -123,12 +123,12 @@ describe('leetcode_client', function() {
     it('should ok', function(done) {
       nock('https://leetcode.com')
         .get('/problems/find-the-difference')
-        .replyWithFile(200, './test/mock/find-the-difference.html.20160911');
+        .replyWithFile(200, './test/mock/find-the-difference.html.20170424');
 
       client.getProblem(PROBLEM, function(e, problem) {
         assert.equal(e, null);
-        assert.equal(problem.totalAC, 15674);
-        assert.equal(problem.totalSubmit, 32141);
+        assert.equal(problem.totalAC, 63380);
+        assert.equal(problem.totalSubmit, 123178);
         assert.equal(problem.desc,
           [
             '',
@@ -187,7 +187,8 @@ describe('leetcode_client', function() {
             '        :type s: str',
             '        :type t: str',
             '        :rtype: str',
-            '        """'
+            '        """',
+            '        '
           ].join('\r\n'));
 
         assert.equal(problem.templates[3].value, 'c');
@@ -566,3 +567,4 @@ describe('leetcode_client', function() {
     });
   }); // #login
 });
+