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authorNorbert Preining <norbert@preining.info>2020-09-08 03:02:12 +0000
committerNorbert Preining <norbert@preining.info>2020-09-08 03:02:12 +0000
commitbc2d0660f4f460b55009ab4e525f2a0e4cde6187 (patch)
treed35815089faf23c45f4f21690e42cfcc7c65a5fd /support/tex4ebook/tex4ebook-exec_epub.lua
parent57edbaffbe7daad894e3036a4123acd03e0fdb9b (diff)
CTAN sync 202009080302
Diffstat (limited to 'support/tex4ebook/tex4ebook-exec_epub.lua')
-rw-r--r--support/tex4ebook/tex4ebook-exec_epub.lua113
1 files changed, 113 insertions, 0 deletions
diff --git a/support/tex4ebook/tex4ebook-exec_epub.lua b/support/tex4ebook/tex4ebook-exec_epub.lua
index 52e2ab6134..b0ccee6202 100644
--- a/support/tex4ebook/tex4ebook-exec_epub.lua
+++ b/support/tex4ebook/tex4ebook-exec_epub.lua
@@ -5,6 +5,7 @@ local io = require("io")
local log = logging.new("exec_epub")
--local ebookutils = require("ebookutils")
local ebookutils = require "mkutils"
+local dom = require("luaxml-domobject")
local outputdir_name="OEBPS"
local metadir_name = "META-INF"
local mimetype_name="mimetype"
@@ -319,11 +320,123 @@ function pack_container()
ebookutils.cp(basedir .."/"..outputfile, destdir .. outputfile)
end
+local function update_file(filename, fn)
+ -- update contents of a filename using function
+ local f = io.open(filename, "r")
+ local content = f:read("*all")
+ f:close()
+ local newcontent = fn(content)
+ local f = io.open(filename, "w")
+ f:write(newcontent)
+ f:close()
+end
+
+local function fix_ncx_toc_levels(dom)
+ -- OK, this is a weird hack. The problem is that when \backmatter
+ -- follows \part, the subsequent chapters are listed under part
+ -- in the NCX TOC
+ -- I've added special element <navmark> to the ncx file to detect mark numbers.
+ -- chapters in backmatter should have empty mark number
+
+ -- get current <navpoint> section type and mark number
+ local get_navpoint_info = function(navpoint)
+ local navmarks = navpoint:query_selector("navmark")
+ if navmarks and #navmarks > 0 then
+ -- we are interested only in the first navmark, because it contains the current navPoint info
+ local navmark = navmarks[1]
+ return navmark:get_attribute("type"), navmark:get_text()
+ end
+ return nil, "Cannot find navLabel"
+ end
+
+ local fix_chapters = function(part)
+ -- move chapters from backmatter and appendix from the current part
+ -- find part position in the element list, it will be place where backmatter will be moved
+ local part_pos = part:find_element_pos() + 1
+ local part_parent = part:get_parent()
+ -- child chapters
+ local children = part:get_children()
+ -- loop over children from back, where backmatter or appendix may be placed
+ for i = #children, 1, -1 do
+ local current = children[i]
+ local sect_type, mark = get_navpoint_info(current)
+ if sect_type then
+ -- remove spaces from mark
+ mark = mark:gsub("%s", "")
+ if sect_type == "appendix" or (sect_type == "chapter" and mark=="") then
+ -- move chapter at the same level as part, after part
+ -- the correct order will be kept, because we move from the back of the node list
+ -- and every new node is placed before previous added nodes
+ part_parent:add_child_node(current:copy_node(), part_pos)
+ current:remove_node()
+ else
+ -- break processing if we find normal chapter
+ break
+ end
+ end
+ end
+ end
+
+ -- find the last part in the ncx table. it can contain incorrectly nested chapters
+ local parts = {}
+ for _, navpoint in ipairs(dom:query_selector("navMap navPoint")) do
+ -- we are not able to match just direct navPoint ancestors, so we will use this trick
+ if navpoint:get_parent():get_element_name() == "navMap" then
+ local sec_type, navmark = get_navpoint_info(navpoint)
+ if sec_type == "part" then table.insert(parts, navpoint) end
+ end
+ end
+ if #parts > 0 then
+ -- fix chapters in the last part
+ fix_chapters(parts[#parts])
+ end
+ return dom
+end
+
+local function clean_xml_files()
+ local opf_file = outputdir .. "/content.opf"
+ update_file(opf_file, function(content)
+ -- remove wrong elements from the OPF file
+ -- open opf file and create LuaXML DOM
+ local opf_dom = dom.parse(content)
+ -- remove child elements from elements that don't allow them
+ for _, el in ipairs(opf_dom:query_selector("dc|title, dc|creator")) do
+ -- get text content
+ local text = el:get_text()
+ -- replace element text with a new text node containing original text
+ el._children = {el:create_text_node(text)}
+ end
+ return opf_dom:serialize()
+ end)
+ local ncxfilename = outputdir .. "/" .. outputfilename .. ".ncx"
+ update_file(ncxfilename, function(content)
+ -- remove spurious spaces at the beginning
+ content = content:gsub("^%s*","")
+ local ncx_dom = dom.parse(content)
+ fix_ncx_toc_levels(ncx_dom)
+ -- remove child elements from <text> element
+ for _, el in ipairs(ncx_dom:query_selector("text")) do
+ local text = el:get_text()
+ -- replace element text with a new text node containing original text
+ el._children = {el:create_text_node(text)}
+ end
+ for _, el in ipairs(ncx_dom:query_selector("navPoint")) do
+ -- fix attribute names. this issue is caused by a LuaXML behavior
+ -- that makes all attributes lowercase
+ el._attr["playOrder"] = el._attr["playorder"]
+ el._attr["playorder"] = nil
+ end
+ return ncx_dom:serialize()
+ end)
+
+end
function writeContainer()
make_opf()
+ clean_xml_files()
pack_container()
end
+
local function deldir(path)
for entry in lfs.dir(path) do
if entry~="." and entry~=".." then