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-- fontspec-4ht.lua (2016-12-10-15:36), generated from tex4ht-4ht.tex
-- Copyright 2016 TeX Users Group
--[[
% Copyright 2009-2016 TeX Users Group
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either
% version 1.3c of this license or (at your option) any
% later version. The latest version of this license is in
% http://www.latex-project.org/lppl.txt
% and version 1.3c or later is part of all distributions
% of LaTeX version 2005/12/01 or later.
%
% This work has the LPPL maintenance status "maintained".
%
% The Current Maintainer of this work
% is the TeX4ht Project <http://tug.org/tex4ht>.
%
% If you modify this program, changing the
% version identification would be appreciated.
--]]
local M = {}
local glyph_id = node.id "glyph"
local whatsit_id = node.id "whatsit"
local special_subtype = node.subtype "special"
local dir_id = node.id "dir"
local glue_id = node.id "glue"
local escape = function(char)
-- prepare tex4ht special for entity with unicode value
return string.format("t4ht@+&{35}x%x{59}", char)
end
local make_node = function(data)
-- make special whathsit
local n = node.new(whatsit_id,special_subtype)
n.data = data
return n
end
-- this should be table with patterns for allowed fonts
local allowed_names = {"^cmr", "^cmb","^cmt", "^cmb", "^cmcs", "^rm%-l", "^cmi", "none"}
local testfont = function(name)
-- test font name for all allowed names, when it is found, return true
for _, x in ipairs(allowed_names) do
local r = name:match(x)
if r then
return true
end
end
return false
end
local fonttypes = {}
local get_font_type = function(id)
if fonttypes[id]~=nil then return fonttypes[id] end
local f = font.getfont(id) or {name = "none"} -- font object can be nil sometimes
local name = f.name
local type = testfont(string.lower(name))
if not type then
print("Unsupported font", name)
end
fonttypes[id] = type
return type
end
local xchar = string.byte("x")
local utfchar = unicode.utf8.char
function M.char_to_entity(head)
-- traverse characters
for n in node.traverse(head) do
if n.id == glyph_id then
-- we need to process only default text font, ie cmr, because user may request special mathematical fonts,
-- which should be processed via htf files as usual
local t = get_font_type(n.font)
if t == true then
local char = n.char
if char > 127 then
local new = escape(char)
local x = make_node(new)
-- insert tex4ht special before char, it will replace the char
node.insert_before(head, n, x)
-- in standard tex4ht accented characters are replaced with "x" char. they are later removed anyway
-- maybe we don't need to do that, but we can, so why not?
n.char = xchar
end
end
elseif n.id == dir_id then
-- when text direction is TRT, the spaces in the DVI file have negative width and they are not recognized by tex4ht
-- so we just change the direction to normal TLT
n.dir = "TLT"
end
end
return head
end
M.allowed = allowed_names
return M
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