add fulltext search for EPUB documents

frontend/apps/reader/modules/readerhighlight.lua

@@ -111,19 +111,24 @@ function ReaderHighlight:onSetDimensions(dimen)
 end
 
 function ReaderHighlight:clear()
+    if self.ui.document.info.has_pages then
+        self.view.highlight.temp = {}
+    else
+        self.ui.document:clearSelection()
+    end
+    UIManager:setDirty(self.dialog, "partial")
     if self.hold_pos then
-        if self.ui.document.info.has_pages then
-            self.view.highlight.temp[self.hold_pos.page] = nil
-        else
-            self.ui.document:clearSelection()
-        end
         self.hold_pos = nil
         self.selected_text = nil
-        UIManager:setDirty(self.dialog, "partial")
         return true
     end
 end
 
+function ReaderHighlight:onClearHighlight()
+    self:clear()
+    return true
+end
+
 function ReaderHighlight:onTap(arg, ges)
     if not self:clear() then
         if self.ui.document.info.has_pages then
@@ -333,11 +338,10 @@ function ReaderHighlight:onHoldRelease()
                 },
                 {
                     {
-                        text = _("Share"),
-                        enabled = false,
+                        text = _("Search"),
                         callback = function()
-                            self:shareHighlight()
-                            self:onClose()
+                            self:onHighlightSearch()
+                            UIManager:close(self.highlight_dialog)
                         end,
                     },
                     {
@@ -357,16 +361,20 @@ function ReaderHighlight:onHoldRelease()
     return true
 end
 
-function ReaderHighlight:onHighlight()
+function ReaderHighlight:highlightFromHoldPos()
     if self.hold_pos then
         if not self.selected_text then
             self.selected_text = self.ui.document:getTextFromPositions(self.hold_pos, self.hold_pos)
             DEBUG("selected text:", self.selected_text)
         end
-        self:saveHighlight()
     end
 end
 
+function ReaderHighlight:onHighlight()
+    self:highlightFromHoldPos()
+    self:saveHighlight()
+end
+
 function ReaderHighlight:saveHighlight()
     DEBUG("save highlight")
     local page = self.hold_pos.page
@@ -427,6 +435,14 @@ function ReaderHighlight:lookupWikipedia()
     end
 end
 
+function ReaderHighlight:onHighlightSearch()
+    DEBUG("search highlight")
+    self:highlightFromHoldPos()
+    if self.selected_text then
+        self.ui:handleEvent(Event:new("ShowSearchDialog", self.selected_text.text))
+    end
+end
+
 function ReaderHighlight:shareHighlight()
     DEBUG("share highlight")
 end

frontend/apps/reader/modules/readersearch.lua

@@ -0,0 +1,100 @@
+local InputContainer = require("ui/widget/container/inputcontainer")
+local ButtonDialog = require("ui/widget/buttondialog")
+local UIManager = require("ui/uimanager")
+local Geom = require("ui/geometry")
+local Screen = require("ui/screen")
+local DEBUG = require("dbg")
+local _ = require("gettext")
+
+local ReaderSearch = InputContainer:new{
+    direction = 0, -- 0 for search forward, 1 for search backward
+    case_insensitive = 1, -- default to case insensitive
+}
+
+function ReaderSearch:init()
+    self.ui.menu:registerToMainMenu(self)
+end
+
+function ReaderSearch:addToMainMenu(tab_item_table)
+    table.insert(tab_item_table.plugins, {
+        text = _("Fulltext search"),
+        tap_input = {
+            title = _("Input text to search for"),
+            type = "text",
+            callback = function(input)
+                self:onShowSearchDialog(input)
+            end,
+        },
+    })
+end
+
+function ReaderSearch:onShowSearchDialog(text)
+    local do_search = function(search_func, text, param)
+        return function()
+            local res = search_func(self, text, param)
+            if res then
+                self.ui.link:onGotoLink(res[1].start)
+            end
+        end
+    end
+    self.search_dialog = ButtonDialog:new{
+        alpha = 0.5,
+        buttons = {
+            {
+                {
+                    text = "|<",
+                    callback = do_search(self.searchFromStart, text),
+                },
+                {
+                    text = "<",
+                    callback = do_search(self.searchNext, text, 1),
+                },
+                {
+                    text = ">",
+                    callback = do_search(self.searchNext, text, 0),
+                },
+                {
+                    text = ">|",
+                    callback = do_search(self.searchFromEnd, text),
+                },
+            }
+        },
+        tap_close_callback = function()
+            DEBUG("highlight clear")
+            self.ui.highlight:clear()
+        end,
+    }
+    local res = do_search(self.searchFromCurrent, text, 0)()
+    UIManager:show(self.search_dialog)
+    UIManager:setDirty(self.dialog, "partial")
+    return true
+end
+
+function ReaderSearch:search(pattern, origin)
+    local direction = self.direction
+    local case = self.case_insensitive
+    return self.ui.document:findText(pattern, origin, direction, case)
+end
+
+function ReaderSearch:searchFromStart(pattern)
+    self.direction = 0
+    return self:search(pattern, -1)
+end
+
+function ReaderSearch:searchFromEnd(pattern)
+    self.direction = 1
+    return self:search(pattern, -1)
+end
+
+function ReaderSearch:searchFromCurrent(pattern, direction)
+    self.direction = direction
+    return self:search(pattern, 0)
+end
+
+-- ignore current page and search next occurrence
+function ReaderSearch:searchNext(pattern, direction)
+    self.direction = direction
+    return self:search(pattern, 1)
+end
+
+return ReaderSearch

frontend/apps/reader/readerui.lua

@@ -37,9 +37,10 @@ local ReaderDictionary = require("apps/reader/modules/readerdictionary")
 local ReaderWikipedia = require("apps/reader/modules/readerwikipedia")
 local ReaderHyphenation = require("apps/reader/modules/readerhyphenation")
 local ReaderActivityIndicator = require("apps/reader/modules/readeractivityindicator")
+local FileManagerHistory = require("apps/filemanager/filemanagerhistory")
+local ReaderSearch = require("apps/reader/modules/readersearch")
 local ReaderLink = require("apps/reader/modules/readerlink")
 local PluginLoader = require("apps/reader/pluginloader")
-local FileManagerHistory = require("apps/filemanager/filemanagerhistory")
 
 --[[
 This is an abstraction for a reader interface
@@ -280,6 +281,12 @@ function ReaderUI:init()
             ui = self
         })
     end
+    -- fulltext search
+    self:registerModule("search", ReaderSearch:new{
+        dialog = self.dialog,
+        view = self.view,
+        ui = self
+    })
 
     -- koreader plugins
     for _,module in ipairs(PluginLoader:loadPlugins()) do

frontend/document/credocument.lua

@@ -312,6 +312,7 @@ function CreDocument:setFontFace(new_font_face)
 end
 
 function CreDocument:clearSelection()
+    DEBUG("clear selection")
     self._document:clearSelection()
 end
 
@@ -418,6 +419,11 @@ function CreDocument:setStatusLineProp(prop)
     self._document:setStringProperty("window.status.line", prop)
 end
 
+function CreDocument:findText(pattern, origin, reverse, caseInsensitive)
+    DEBUG("CreDocument: find text", pattern, origin, reverse, caseInsensitive)
+    return self._document:findText(pattern, origin, reverse, caseInsensitive)
+end
+
 function CreDocument:register(registry)
     registry:addProvider("txt", "application/txt", self)
     registry:addProvider("epub", "application/epub", self)

frontend/document/document.lua

@@ -217,6 +217,10 @@ function Document:getCoverPageImage()
     return nil
 end
 
+function Document:findText()
+    return nil
+end
+
 function Document:getFullPageHash(pageno, zoom, rotation, gamma, render_mode)
     return "renderpg|"..self.file.."|"..self.mod_time.."|"..pageno.."|"
                     ..zoom.."|"..rotation.."|"..gamma.."|"..render_mode

frontend/ui/widget/dictquicklookup.lua

@@ -187,10 +187,10 @@ function DictQuickLookup:update()
                     end,
                 },
                 {
-                    text = _("More"),
-                    enabled = false,
+                    text = _("Search"),
                     callback = function()
-                        self.ui:handleEvent(Event:new("HighlightMore"))
+                        self.ui:handleEvent(Event:new("HighlightSearch"))
+                        UIManager:close(self)
                     end,
                 },
             },

spec/unit/readersearch_spec.lua

@@ -0,0 +1,94 @@
+require("commonrequire")
+local DocumentRegistry = require("document/documentregistry")
+local ReaderUI = require("apps/reader/readerui")
+local DEBUG = require("dbg")
+
+local sample_epub = "spec/front/unit/data/juliet.epub"
+
+describe("Readersearch module", function()
+    describe("search API for EPUB documents", function()
+        local doc, search, rolling
+        setup(function()
+            local readerui = ReaderUI:new{
+                document = DocumentRegistry:openDocument(sample_epub),
+            }
+            doc = readerui.document
+            search = readerui.search
+            rolling = readerui.rolling
+        end)
+        it("should search backward", function()
+            rolling:gotoPage(10)
+            assert.truthy(search:searchFromCurrent("Verona", 1))
+            for i = 1, 100, 10 do
+                rolling:gotoPage(i)
+                local words = search:searchFromCurrent("Verona", 1)
+                if words then
+                    for _, word in ipairs(words) do
+                        local pageno = doc:getPageFromXPointer(word.start)
+                        --DEBUG("found at pageno", pageno)
+                        assert.truthy(pageno <= i)
+                    end
+                end
+            end
+        end)
+        it("should search forward", function()
+            rolling:gotoPage(10)
+            assert.truthy(search:searchFromCurrent("Verona", 0))
+            for i = 1, 100, 10 do
+                rolling:gotoPage(i)
+                local words = search:searchFromCurrent("Verona", 0)
+                if words then
+                    for _, word in ipairs(words) do
+                        local pageno = doc:getPageFromXPointer(word.start)
+                        --DEBUG("found at pageno", pageno)
+                        assert.truthy(pageno >= i)
+                    end
+                end
+            end
+        end)
+        it("should find the first occurrence", function()
+            for i = 10, 100, 10 do
+                rolling:gotoPage(i)
+                local words = search:searchFromStart("Verona")
+                assert.truthy(words)
+                local pageno = doc:getPageFromXPointer(words[1].start)
+                assert.are.equal(8, pageno)
+            end
+            for i = 1, 5, 1 do
+                rolling:gotoPage(i)
+                local words = search:searchFromStart("Verona")
+                assert(words == nil)
+            end
+        end)
+        it("should find the last occurrence", function()
+            for i = 100, 200, 10 do
+                rolling:gotoPage(i)
+                local words = search:searchFromEnd("Verona")
+                assert.truthy(words)
+                local pageno = doc:getPageFromXPointer(words[1].start)
+                assert.are.equal(208, pageno)
+            end
+            for i = 230, 235, 1 do
+                rolling:gotoPage(i)
+                local words = search:searchFromEnd("Verona")
+                assert(words == nil)
+            end
+        end)
+        it("should find all occurrences", function()
+            local count = 0
+            rolling:gotoPage(1)
+            local words = search:searchFromCurrent("Verona", 0)
+            while words do
+                count = count + #words
+                for _, word in ipairs(words) do
+                    --DEBUG("found word", word.start)
+                end
+                doc:gotoXPointer(words[1].start)
+                words = search:searchNext("Verona", 0)
+            end
+            assert.are.equal(13, count)
+        end)
+    end)
+    describe("search API for PDF documents", function()
+    end)
+end)