Fixes but 960409 and adresses review comments including removal of do-while construct

web/pdf_find_controller.js

@@ -52,8 +52,6 @@ var PDFFindController = {
 
   resumePageIdx: null,
 
-  resumeCallback: null,
-
   state: null,
 
   dirtyMatch: false,
@@ -66,7 +64,7 @@ var PDFFindController = {
 
   initialize: function(options) {
     if(typeof PDFFindBar === 'undefined' || PDFFindBar === null) {
-        throw 'PDFFindController cannot be initialized ' +
+      throw 'PDFFindController cannot be initialized ' +
             'without a PDFFindController instance';
     }
 
@@ -126,10 +124,8 @@ var PDFFindController = {
     this.pageMatches[pageIndex] = matches;
     this.updatePage(pageIndex);
     if (this.resumePageIdx === pageIndex) {
-      var callback = this.resumeCallback;
       this.resumePageIdx = null;
-      this.resumeCallback = null;
-      callback();
+      this.nextPageMatch();
     }
   },
 
@@ -220,7 +216,6 @@ var PDFFindController = {
       this.offset.pageIdx = currentPageIndex;
       this.offset.matchIdx = null;
       this.hadMatch = false;
-      this.resumeCallback = null;
       this.resumePageIdx = null;
       this.pageMatches = [];
       var self = this;
@@ -247,7 +242,7 @@ var PDFFindController = {
     }
 
     // If we're waiting on a page, we return since we can't do anything else.
-    if (this.resumeCallback) {
+    if (this.resumePageIdx) {
       return;
     }
 
@@ -273,48 +268,51 @@ var PDFFindController = {
     this.nextPageMatch();
   },
 
+  matchesReady: function(matches) {
+    var offset = this.offset;
+    var numMatches = matches.length;
+    var previous = this.state.findPrevious;
+    if (numMatches) {
+      // There were matches for the page, so initialize the matchIdx.
+      this.hadMatch = true;
+      offset.matchIdx = previous ? numMatches - 1 : 0;
+      this.updateMatch(true);
+      // matches were found
+      return true;
+    } else {
+      // No matches attempt to search the next page.
+      this.advanceOffsetPage(previous);
+      if (offset.wrapped) {
+        offset.matchIdx = null;
+        if (!this.hadMatch) {
+          // No point in wrapping there were no matches.
+          this.updateMatch(false);
+          // while matches were not found, searching for a page 
+          // with matches should nevertheless halt.
+          return true;
+        }
+      }
+      // matches were not found (and searching is not done)
+      return false;
+    }
+  },
+
   nextPageMatch: function() {
     if (this.resumePageIdx !== null)
       console.error('There can only be one pending page.');
-
-    var matchesReady = function(matches) {
-      var offset = this.offset;
-      var numMatches = matches.length;
-      var previous = this.state.findPrevious;
-      if (numMatches) {
-        // There were matches for the page, so initialize the matchIdx.
-        this.hadMatch = true;
-        offset.matchIdx = previous ? numMatches - 1 : 0;
-        this.updateMatch(true);
-      } else {
-        // No matches attempt to search the next page.
-        this.advanceOffsetPage(previous);
-        if (offset.wrapped) {
-          offset.matchIdx = null;
-          if (!this.hadMatch) {
-            // No point in wrapping there were no matches.
-            this.updateMatch(false);
-            return;
-          }
-        }
-        // Search the next page.
-        this.nextPageMatch();
+    // done boolean to remove do-while construct per review of PR 4131
+    var done = false;
+    while (!done) {
+      var pageIdx = this.offset.pageIdx;
+      var matches = this.pageMatches[pageIdx];
+      if (!matches) {
+        // The matches don't exist yet for processing by "matchesReady",
+        // so set a resume point for when they do exist.
+        this.resumePageIdx = pageIdx;
+        break;
       }
-    }.bind(this);
-
-    var pageIdx = this.offset.pageIdx;
-    var pageMatches = this.pageMatches;
-    if (!pageMatches[pageIdx]) {
-      // The matches aren't ready setup a callback so we can be notified,
-      // when they are ready.
-      this.resumeCallback = function() {
-        matchesReady(pageMatches[pageIdx]);
-      };
-      this.resumePageIdx = pageIdx;
-      return;
+      done = this.matchesReady(matches);
     }
-    // The matches are finished already.
-    matchesReady(pageMatches[pageIdx]);
   },
 
   advanceOffsetPage: function(previous) {