EPUB CFI basically works. Now for the more comprehensive testing.

src/calibre/ebooks/oeb/display/cfi.coffee

@@ -58,16 +58,6 @@ get_current_time = (target) -> # {{{
     fstr(ans)
 # }}}
 
-set_current_time = (target, val) -> # {{{
-    if target.currentTime == undefined
-        return
-    if target.readyState == 4 or target.readyState == "complete"
-        target.currentTime = val
-    else
-        fn = -> target.currentTime = val
-        target.addEventListener("canplay", fn, false)
-
-#}}}
 
 class CanonicalFragmentIdentifier
 
@@ -76,13 +66,23 @@ class CanonicalFragmentIdentifier
 
     constructor: () ->
 
+    set_current_time: (target, val) -> # {{{
+        if target.currentTime == undefined
+            return
+        if target.readyState == 4 or target.readyState == "complete"
+            target.currentTime = val
+        else
+            fn = -> target.currentTime = val
+            target.addEventListener("canplay", fn, false)
+    #}}}
+
     encode: (doc, node, offset, tail) -> # {{{
         cfi = tail or ""
 
         # Handle the offset, if any
         switch node.nodeType
             when 1 # Element node
-                if typeoff(offset) == 'number'
+                if typeof(offset) == 'number'
                     node = node.childNodes.item(offset)
             when 3, 4, 5, 6 # Text/entity/CDATA node
                 offset or= 0
@@ -136,7 +136,7 @@ class CanonicalFragmentIdentifier
         node = doc
 
         until cfi.length < 1 or error
-            if ( (r = cfi.match(simple_node_regex)) is not null ) # Path step
+            if (r = cfi.match(simple_node_regex)) # Path step
                 target = parseInt(r[1])
                 assertion = r[2]
                 if assertion
@@ -318,22 +318,31 @@ class CanonicalFragmentIdentifier
                 try_list = [{start:0, end:0, a:0.5}, {start:0, end:1, a:1}, {start:-1, end:0, a:0}]
             else
                 try_list = [{start:0, end:0, a:0.5}, {start:-1, end:0, a:0}, {start:0, end:1, a:1}]
-            k = 0
             a = null
             rects = null
             node_len = node.nodeValue.length
-            until rects or rects.length or k >= try_list.length
-                t = try_list[k++]
-                start_offset = r.offset + t.start
-                end_offset = r.offset + t.end
-                a = t.a
-                if start_offset < 0 or end_offset >= node_len
-                    continue
-                range.setStart(node, start_offset)
-                range.setEnd(node, end_offset)
-                rects = range.getClientRects()
+            offset = r.offset
+            for i in [0, 1]
+                # Try reducing the offset by 1 if we get no match as if it refers to the position after the
+                # last character we wont get a match with getClientRects
+                offset = r.offset - i
+                if offset < 0
+                    offset = 0
+                k = 0
+                until rects?.length or k >= try_list.length
+                    t = try_list[k++]
+                    start_offset = offset + t.start
+                    end_offset = offset + t.end
+                    a = t.a
+                    if start_offset < 0 or end_offset >= node_len
+                        continue
+                    range.setStart(node, start_offset)
+                    range.setEnd(node, end_offset)
+                    rects = range.getClientRects()
+                if rects?.length
+                    break
 
-            if not rects or not rects.length
+            if not rects?.length
                 log("Could not find caret position: rects: #{ rects } offset: #{ r.offset }")
                 return null
 

src/calibre/ebooks/oeb/display/test/cfi-test.coffee

@@ -6,19 +6,59 @@
  Released under the GPLv3 License
 ###
 
+log = (error) ->
+    if error
+        if window?.console?.log
+            window.console.log(error)
+        else if process?.stdout?.write
+            process.stdout.write(error + '\n')
+
 viewport_top = (node) ->
     $(node).offset().top - window.pageYOffset
 
 viewport_left = (node) ->
     $(node).offset().left - window.pageXOffset
 
-window.onload = ->
-    h1 = document.getElementsByTagName('h1')[0]
-    x = h1.scrollLeft + 150
-    y = viewport_top(h1) + h1.offsetHeight/2
-    e = document.elementFromPoint x, y
-    if e.getAttribute('id') != 'first-h1'
-        alert 'Failed to find top h1'
-        return
-    alert window.cfi.at x, y
+show_cfi = (dont_seek) ->
+    if window.current_cfi
+        pos = window.cfi.point(window.current_cfi)
+        ms = document.getElementById("marker").style
+        if pos
+            ms.visibility = "visible"
+            ms.top = (pos.y - 30) + window.scrollY + "px"
+            ms.left = (pos.x - 1) + window.scrollX + "px"
+            if not dont_seek
+                if typeof pos.time == "number"
+                    window.cfi.set_current_time(pos.node, pos.time)
+                scrollTo(0, pos.y - 30)
+    null
+
+RELOAD = true
+
+mark_and_reload = (evt) ->
+    window.current_cfi = window.cfi.at(evt.clientX, evt.clientY)
+    if not RELOAD
+        show_cfi(true)
+    if window.current_cfi
+        fn = () ->
+            newloc = window.location.href.replace(/#.*$/, '') + "#epubcfi(#{ window.current_cfi })"
+            window.location.replace(newloc)
+            if RELOAD
+                window.location.reload()
+
+        setTimeout(fn, 1)
+    null
+
+window.onload = ->
+    window.onscroll = show_cfi
+    window.onresize = show_cfi
+    document.onclick = mark_and_reload
+    for iframe in document.getElementsByTagName("iframe")
+        iframe.contentWindow.onscroll = show_cfi
+    r = location.hash.match(/#epubcfi\((.+)\)$/)
+    if r
+        window.current_cfi = r[1]
+        setTimeout(show_cfi, 1)
+    null
+
 

src/calibre/ebooks/oeb/display/test/index.html

@@ -8,6 +8,8 @@
     </head>
     <body>
         <h1 id="first-h1" style="border: solid 1px red">Testing CFI functionality</h1>
+        <img id="marker" style="position: absolute; visibility: hidden;" src="marker.png" alt="Marker" />
+        <p>0123</p>
     </body>
 </html>
 

src/calibre/utils/coffeescript.py

@@ -10,7 +10,8 @@ __docformat__ = 'restructuredtext en'
 '''
 Utilities to help with developing coffeescript based apps
 '''
-import time, SimpleHTTPServer, SocketServer, os, subprocess, cStringIO
+import time, SimpleHTTPServer, SocketServer, os, subprocess
+from io import BytesIO
 
 class Handler(SimpleHTTPServer.SimpleHTTPRequestHandler):
 
@@ -28,7 +29,7 @@ class Handler(SimpleHTTPServer.SimpleHTTPRequestHandler):
             self.send_header("Content-Length", bytes(len(raw)))
             self.send_header("Last-Modified", self.date_time_string(int(mtime)))
             self.end_headers()
-            return cStringIO.StringIO(raw)
+            return BytesIO(raw)
 
         return SimpleHTTPServer.SimpleHTTPRequestHandler.send_head(self)