diff options
Diffstat (limited to 'Master/texmf-dist/tex')
-rw-r--r-- | Master/texmf-dist/tex/latex/axessibility/axessibility.lua | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/latex/axessibility/axessibility.lua b/Master/texmf-dist/tex/latex/axessibility/axessibility.lua new file mode 100644 index 00000000000..d66c5a7d601 --- /dev/null +++ b/Master/texmf-dist/tex/latex/axessibility/axessibility.lua @@ -0,0 +1,95 @@ +-- Copyright (C) 2018, 2019, 2020 by +-- Anna Capietto, Sandro Coriasco, Boris Doubrov, Alexander Koslovski, +-- Tiziana Armano, Nadir Murru, Dragan Ahmetovic, Cristian Bernareggi +-- +-- Based on accsupp and tagpdf +-- +-- This work consists of the main source files axessibility.dtx and axessibility.lua, +-- and the derived files +-- axessibility.ins, axessibility.sty, axessibility.pdf, README, +-- axessibilityExampleSingleLineT.tex, axessibilityExampleSingleLineA.tex, +--. axessibilityExampleAlignT.tex, axessibilityExampleAlignA.tex +-- +-- This work may be distributed and/or modified under the +-- conditions of the LaTeX Project Public License, either version 1.3 +-- 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 1.3 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 +-- Sandro Coriasco +-- + + +local open_dls = false +local open_double_dls = false + +--[[ The function replace_dls_and_double_dls() switches on or off automatic replacement of $$ and $. + The boolean argument a (true/false) specifies if the package should do the replacements. + ]] + +function replace_dls_and_double_dls(a) + if a and not luatexbase.in_callback("process_input_buffer", "process_input_buffer") then + luatexbase.add_to_callback("process_input_buffer", replace_chars_callback, "process_input_buffer") + elseif not a and luatexbase.in_callback("process_input_buffer", "process_input_buffer") then + luatexbase.remove_from_callback("process_input_buffer", "process_input_buffer") + end +end + +-- the callback that performs the replacement +function replace_chars_callback(a) + if status.input_ptr == 1 then + -- variable to save comments if any + local comment="" + -- we delete all comments + a = a:gsub("(\\*)(%%.*)", function(group1, group2) + -- check,if we have even number of backslash characters + if #group1 % 2 == 0 then + comment=group1..group2 + return "" + end + return group1..group2 + end) + + -- We must replace empty lines by some value, eg % character + if(open_double_dls or open_dls) and a == "" then + return "%" + end + + local replace_happened = false + a = a:gsub("(\\*)(%$+)", function(group1, group2) + -- if after \$ we have one or more $,algorithm will not do replacement,so we must be check this situation + local b = "" + if #group1 % 2 == 1 and #group2 >1 then + b="\\$" + group1 = group1:sub(2) + group2 = group2:sub(2) + end + + -- if we have even number of backslash characters in front of $$ or $, we do replacement of $$ or $ + if #group1 % 2 == 0 then + replace_happened = true + if group2 == "$$" then + group2 = open_double_dls and "\\]" or "\\[" + open_double_dls = not open_double_dls + elseif group2 == "$" then + group2 = open_dls and "\\)" or "\\(" + open_dls = not open_dls + end + end + return group1..b..group2 + end) + + --return comments back to the line + a = a..comment + -- this might be useful for debug + --[[ if replace_happened then + texio.write_nl("the line after replacement is: "..a) + end]] + return a + end +end
\ No newline at end of file |