count only leaf nodes of toc tree when level is zero

frontend/apps/reader/modules/readertoc.lua

@@ -101,7 +101,8 @@ end
 --[[
 TOC ticks is a list of page number in ascending order of TOC nodes at certain level
 positive level counts nodes of the depth level (level 1 for depth 1)
-non-positive level counts nodes of reversed depth level (level -1 for max_depth-1)
+negative level counts nodes of reversed depth level (level -1 for max_depth)
+zero level counts leaf nodes of the toc tree
 --]]
 function ReaderToc:getTocTicks(level)
     if self.ticks[level] then return self.ticks[level] end
@@ -110,15 +111,26 @@ function ReaderToc:getTocTicks(level)
     local ticks = {}
 
     if #self.toc > 0 then
-        local depth = nil
-        if level > 0 then
-            depth = level
+        if level == 0 then
+            local depth = 0
+            for i = #self.toc, 1, -1 do
+                local v = self.toc[i]
+                if v.depth >= depth then
+                    table.insert(ticks, v.page)
+                end
+                depth = v.depth
+            end
         else
-            depth = self:getMaxDepth() + level
-        end
-        for _, v in ipairs(self.toc) do
-            if v.depth == depth then
-                table.insert(ticks, v.page)
+            local depth = nil
+            if level > 0 then
+                depth = level
+            else
+                depth = self:getMaxDepth() + level + 1
+            end
+            for _, v in ipairs(self.toc) do
+                if v.depth == depth then
+                    table.insert(ticks, v.page)
+                end
             end
         end
         -- normally the ticks are sorted already but in rare cases

spec/unit/readertoc_spec.lua

@@ -25,21 +25,26 @@ describe("Readertoc module", function()
         it("should get ticks of level 0", function()
             ticks_level_0 = toc:getTocTicks(0)
             DEBUG("ticks", ticks_level_0)
-            assert.are.same(26, #ticks_level_0)
+            assert.are.same(28, #ticks_level_0)
         end)
         local ticks_level_1 = nil
         it("should get ticks of level 1", function()
             ticks_level_1 = toc:getTocTicks(1)
             assert.are.same(7, #ticks_level_1)
         end)
+        local ticks_level_2 = nil
+        it("should get ticks of level 2", function()
+            ticks_level_2 = toc:getTocTicks(2)
+            assert.are.same(26, #ticks_level_2)
+        end)
         local ticks_level_m1 = nil
         it("should get ticks of level -1", function()
-            ticks_level_m1 = toc:getTocTicks(1)
-            assert.are.same(7, #ticks_level_m1)
+            ticks_level_m1 = toc:getTocTicks(-1)
+            assert.are.same(26, #ticks_level_m1)
         end)
-        it("should get the same ticks of level -1 and level 1", function()
+        it("should get the same ticks of level -1 and level 2", function()
             if toc_max_depth == 2 then
-                assert.are.same(ticks_level_1, ticks_level_m1)
+                assert.are.same(ticks_level_2, ticks_level_m1)
             end
         end)
     end)