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|
-- autotype.lua
-- Copyright 2020-2024 Stephan Hennig and Keno Wehr
--[[
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.
]]
-- luacheck: globals font luatexbase node tex
luatexbase.provides_module({
name = "autotype",
version = "0.5",
date = "2024-01-05",
description = "automatic language-specific typography"
})
local Ncopy = node.copy
local NLcopy = node.copy_list
local Ninsert_after = node.insert_after
local Ninsert_before = node.insert_before
local Nnew = node.new
local Nhas_attribute = node.has_attribute
local Uchar = utf8.char
local kern_templ = Nnew('kern', 1) -- subtype 1 means userkern
local function get_kern_node(dim)
local n = Ncopy(kern_templ)
n.kern = dim
return n
end
local HYPHEN = 0x2D -- ASCII/Unicode codepoint of a hyphen
-- Penalty values for primary, secondary, and tertiary hyphenation points
local PENALTY_I = 30
local PENALTY_II = 60
local PENALTY_III = 90
local LEFTHYPHENMIN = 2
local RIGHTHYPHENMIN = 2
local long_s_codepoint = {}
local round_s_codepoint = {}
local final_round_s_codepoint = {}
local function normalize_font(TeX_font_name)
-- We have to do some normalization of the name of the current font.
-- Examples: The yfrak font at 11pt is called "yfrak at 10.95pt" by TeX, but we need only "yfrak".
-- The yfrak font becomes something like "yfrak+100ls" if it is letterspaced (e.g. with microtype's \textls commmand),
-- but again, we only need "yfrak".
return string.gsub(TeX_font_name, "[ :%+].*", "")
end
local function set_long_s_codepoint(font, codepoint)
long_s_codepoint[normalize_font(font)] = codepoint
end
local function set_round_s_codepoint(font, codepoint)
round_s_codepoint[normalize_font(font)] = codepoint
end
local function set_final_round_s_codepoint(font, codepoint)
final_round_s_codepoint[normalize_font(font)] = codepoint
end
local function get_long_s_codepoint(font_id)
local font = normalize_font(tex.fontname(font_id))
local codepoint
if long_s_codepoint[font] then
codepoint = long_s_codepoint[font] -- for fonts with irregular encodings
else
codepoint = 0x17F -- Unicode codepoint of ſ
end
return codepoint
end
local function get_round_s_codepoint(font_id)
local font = normalize_font(tex.fontname(font_id))
local codepoint
if round_s_codepoint[font] then
codepoint = round_s_codepoint[font] -- for fonts with irregular encodings
else
codepoint = 0x73 -- ASCII/Unicode codepoint of s
end
return codepoint
end
local function get_final_round_s_codepoint(font_id)
local font = normalize_font(tex.fontname(font_id))
local codepoint
if final_round_s_codepoint[font] then
codepoint = final_round_s_codepoint[font] -- for fonts like wesu14
else
codepoint = get_round_s_codepoint(font_id)
end
return codepoint
end
local function get_current_long_s_codepoint()
return get_long_s_codepoint(font.current())
end
local function get_current_round_s_codepoint()
return get_round_s_codepoint(font.current())
end
local function insert_discretionary(head, first, second, penalty, pre_char)
-- Create discretionary node
local d = Nnew('disc', 0)
d.attr = first.attr
d.penalty = penalty
-- Set pre-break text
if pre_char then
local pre = Ncopy(first)
pre.char = pre_char
d.pre = pre
end
-- Insert discretionary before second node
Ninsert_before(head, second, d)
end
-- @param head Head of a node list.
local function insert_primary_hyphenation_points(head, scan_node_list)
-- Do pattern matching.
local words = scan_node_list(head)
-- Iterate over words.
for _, word in ipairs(words) do
if not word.exhyphenchars then
-- Process words not containing explicit hyphens
for i, level in ipairs(word.levels) do
-- Spot with surrounding top-level nodes?
if (level % 2 == 1) and not word.parents[i-1] and not word.parents[i] then
insert_discretionary(head, word.nodes[i-1], word.nodes[i], PENALTY_I, HYPHEN)
end
end
else
-- Process words containing explicit hyphens
local exhyphenchar_num = #word.exhyphenchars -- the number of explicit hyphens in the word
local char_num = #word.nodes -- the number of characters of the word
for j, k in ipairs(word.exhyphenchars) do
-- Primary hyphenation point at the explicit hyphen
if k > 1 and k < char_num and (j == exhyphenchar_num or word.exhyphenchars[j+1] > k+1) then
insert_discretionary(head, word.nodes[k], word.nodes[k+1], PENALTY_I)
end
end
end
end
end
-- The following function is needed for the parts of a word with explicit hyphens.
-- @param head Head of a node list.
local function insert_tertiary_hyphenation_points(head, original_word, start_number, end_number, scan_node_list)
local node_list = NLcopy(original_word.nodes[start_number], original_word.nodes[end_number].next)
local words = scan_node_list(node_list)
if #words > 0 then
for i, level in ipairs(words[1].levels) do
local j = start_number + i - 1
-- Spot with surrounding top-level nodes?
if (level % 2 == 1) and not original_word.parents[j-1] and not original_word.parents[j] then
insert_discretionary(head, original_word.nodes[j-1], original_word.nodes[j], PENALTY_III, HYPHEN)
end
end
end
end
-- @param head Head of a node list.
local function insert_weighted_hyphenation_points(head, scan_node_list_i, scan_node_list_ii, scan_node_list_iii)
-- Do pattern matching
local words_i = scan_node_list_i(head)
local words_ii = scan_node_list_ii(head)
local words_iii = scan_node_list_iii(head)
-- Iterate over words
for i, word in ipairs(words_i) do
if not word.exhyphenchars then
-- Process words not containing explicit hyphens
for k, level_i in ipairs(word.levels) do
-- Surrounding top-level nodes?
if not word.parents[k-1] and not word.parents[k] then
-- Primary spot?
if level_i % 2 == 1 then
insert_discretionary(head, word.nodes[k-1], word.nodes[k], PENALTY_I, HYPHEN)
else
local level_ii = words_ii[i].levels[k]
-- Secondary spot?
if level_ii % 2 == 1 then
insert_discretionary(head, word.nodes[k-1], word.nodes[k], PENALTY_II, HYPHEN)
else
local level_iii = words_iii[i].levels[k]
-- Tertiary spot?
if level_iii % 2 == 1 then
insert_discretionary(head, word.nodes[k-1], word.nodes[k], PENALTY_III, HYPHEN)
end
end
end
end
end
else
-- Process words containing explicit hyphens
local exhyphenchar_num = #word.exhyphenchars -- the number of explicit hyphens in the word
local char_num = #word.nodes -- the number of characters of the word
for j, k in ipairs(word.exhyphenchars) do
-- Tertiary hyphenation points for the word part before the next explicit hyphen
if j == 1 then
if k > 1 then -- k == 1 means that the first character is a hyphen.
insert_tertiary_hyphenation_points(head, word, 1, k-1, scan_node_list_iii)
end
elseif word.exhyphenchars[j-1] + 1 < k then
insert_tertiary_hyphenation_points(head, word, word.exhyphenchars[j-1]+1, k-1, scan_node_list_iii)
end
-- Primary hyphenation point at the explicit hyphen
if k > 1 and k < char_num and (j == exhyphenchar_num or word.exhyphenchars[j+1] > k+1) then
insert_discretionary(head, word.nodes[k], word.nodes[k+1], PENALTY_I)
end
end
-- Tertiary hyphenation points for the word part after the last explicit hyphen
if word.exhyphenchars[exhyphenchar_num] < char_num then
insert_tertiary_hyphenation_points(head, word,
word.exhyphenchars[exhyphenchar_num]+1,
char_num, scan_node_list_iii)
end
end
end
end
-- converts scaled points to big points, rounded to one decimal place
local function sp_to_bp(num)
return math.floor(num / 65782 * 10) / 10
end
-- The following function marks hyphenation points by a small coloured bar.
-- The code is based on the showhyphens package written by Patrick Gundlach.
local function mark_hyphenation_points(head, lang_name)
local current_lang
local current = head
while current do
if current.id == node.id('hlist') or current.id == node.id('vlist') then
mark_hyphenation_points(current.list, lang_name)
elseif current.id == node.id('glyph') then
current_lang = current.lang
elseif current.id == node.id('disc')
and Nhas_attribute(current, luatexbase.registernumber("autotype_"..lang_name.."_mark_hyph_attr"))
and current_lang == luatexbase.registernumber('l@'..lang_name) then
local colour = "1 0 0" -- red
if current.penalty == PENALTY_I then
colour = "0 0.6 0" -- dark green
elseif current.penalty == PENALTY_II then
colour = "0 0.2 0.8" -- blue
elseif current.penalty == PENALTY_III then
colour = "1 0.5 0" -- orange
end
if current.replace and current.replace.id == node.id('glyph') and current.replace.components then
local wd = sp_to_bp(current.replace.width) or 0
local ht = sp_to_bp(current.replace.height) + 1 or 0
local r = node.new("whatsit", "pdf_literal")
r.data = "q "..colour.." RG 0.7 w 0 "
.. tostring(ht) .. " m "
.. tostring(-wd) .. " " .. tostring(ht) .. " l S Q"
Ninsert_after(current.replace, current.replace, r)
else
local n = node.new("whatsit", "pdf_literal")
n.mode = 0
if current.penalty == PENALTY_I then
n.data = "q "..colour.." RG 0.7 w 0 -1 m 0 8 l S Q"
elseif current.penalty == PENALTY_II then
n.data = "q "..colour.." RG 0.7 w 0 -1 m 0 3 l S Q"
else
n.data = "q "..colour.." RG 0.7 w 0 4 m 0 8 l S Q"
end
n.next = current.next
current.next.prev = n
n.prev = current
current.next = n
current = n
end
end
current = current.next
end
end
--- Manipulation that prevents selected ligatures.
-- This manipulation inserts a 0pt kern between glyph nodes at every position
-- indicated by the ligature breaking patterns. The manipulation has to be
-- applied before TeX's ligaturing stage. The pos variable points to the glyph
-- node after a spot. The kern is inserted after the preceeding glyph node.
-- Which is not the same as inserting before the glyph node pointed to as there
-- may be, e.g., a discretionary between two glyph nodes.
--
-- @param head Head of a node list.
local function break_ligatures(head, scan_node_list, lang_name)
-- Do pattern matching.
local words = scan_node_list(head)
-- Iterate over words.
for _, word in ipairs(words) do
-- Debug output.
local w = {}
for _, n in ipairs(word.nodes) do
table.insert(w, Uchar(n.char))
end
-- Check all valid spots.
for pos, level in ipairs(word.levels) do
-- Valid spot?
if (level % 2) == 1 then
-- Apply manipulation to glyph nodes at indices pos-1 and pos.
-- Only plain top-level glyph nodes are handled currently.
if not word.parents[pos-1] and not word.parents[pos] then
local first_node = word.nodes[pos-1]
if Nhas_attribute(first_node, luatexbase.registernumber("autotype_"..lang_name.."_ligbreak_attr")) then
local kern_node = get_kern_node(0)
Ninsert_after(head, first_node, kern_node)
end
end
end
end
end
end
--- Manipulation that inserts long s glyphs.
-- All round s glyphs (char code 0x73, LATIN SMALL LETTER S) not
-- followed by a spot are replaced by a long s glyph (char code 0x017f,
-- LATIN SMALL LETTER LONG S).
--
-- @param head Head of a node list.
local function insert_long_s(head, scan_node_list, lang_name)
-- Do pattern matching.
local words = scan_node_list(head)
-- Iterate over words.
for _, word in ipairs(words) do
-- Replace all round s glyphs not followed by a spot by a long s
-- glyph except for the last character of a word.
for i, n in ipairs(word.nodes) do
if n.char == 0x73 and Nhas_attribute(n, luatexbase.registernumber("autotype_"..lang_name.."_long_s_attr")) then
if i == #word.levels - 1 then -- last character of the word
n.char = get_final_round_s_codepoint(n.font)
elseif word.levels[i+1] % 2 == 1 then
n.char = get_round_s_codepoint(n.font)
else
n.char = get_long_s_codepoint(n.font)
end
end
end
end
end
-- Call-back registering.
--
-- Load padrinoma module.
local padrinoma = require('autotype-pdnm_nl_manipulation')
local function get_hyphenation_pattern_file(lang_name, lang_num, suffix)
local pattern_file
if lang_num then
if lang_num == luatexbase.registernumber('l@german') then
pattern_file = 'hyph-de-1901'..suffix..'.pat.txt'
elseif lang_num == luatexbase.registernumber('l@swissgerman') then
pattern_file = 'hyph-de-CH-1901'..suffix..'.pat.txt'
else
pattern_file = 'hyph-de-1996'..suffix..'.pat.txt'
end
elseif lang_name == 'german' or lang_name == 'austrian' then
pattern_file = 'hyph-de-1901'..suffix..'.pat.txt'
elseif lang_name == 'swissgerman' then
pattern_file = 'hyph-de-CH-1901'..suffix..'.pat.txt'
else
pattern_file = 'hyph-de-1996'..suffix..'.pat.txt'
end
if suffix ~= '' then
pattern_file = 'autotype-'..pattern_file
elseif pattern_file == 'hyph-de-CH-1901.pat.txt' then
pattern_file = 'hyph-de-ch-1901.pat.txt' -- hyph-utf8 only uses lower-case letters in file names
end
return pattern_file
end
local original_patterns = {}
local function clear_patterns(lang_name)
local lang_num = luatexbase.registernumber('l@'..lang_name)
local luatex_lang = lang.new(lang_num)
if not original_patterns[lang_num] then
original_patterns[lang_num] = lang.patterns(luatex_lang)
end
lang.clear_patterns(luatex_lang)
end
local function restore_patterns(lang_name)
local lang_num = luatexbase.registernumber('l@'..lang_name)
if original_patterns[lang_num] then
lang.patterns(lang.new(lang_num), original_patterns[lang_num])
end
end
local function default_hyph(lang_name)
-- Remove primary or weighted hyphenation from hyphenate callback
if luatexbase.in_callback('hyphenate', 'autotype primary hyphenation for '..lang_name) then
luatexbase.remove_from_callback('hyphenate', 'autotype primary hyphenation for '..lang_name)
elseif luatexbase.in_callback('hyphenate', 'autotype weighted hyphenation for '..lang_name) then
luatexbase.remove_from_callback('hyphenate', 'autotype weighted hyphenation for '..lang_name)
end
-- Restore original patterns to be used by TeX's default hyphenation algorithm
restore_patterns(lang_name)
end
local function primary_hyph(lang_name, lang_num)
-- Clear the language's patterns to avoid insertion of hyphenation points by TeX
clear_patterns(lang_name)
local scan_node_list = padrinoma.create_node_list_scanner(
lang_num or lang_name,
get_hyphenation_pattern_file(lang_name, lang_num, '-primary'),
LEFTHYPHENMIN, RIGHTHYPHENMIN
)
-- Remove weighted hyphenation from hyphenate callback
if luatexbase.in_callback('hyphenate', 'autotype weighted hyphenation for '..lang_name) then
luatexbase.remove_from_callback('hyphenate', 'autotype weighted hyphenation for '..lang_name)
end
-- Register callback for primary hyphenation
if not luatexbase.in_callback('hyphenate', 'autotype primary hyphenation for '..lang_name) then
luatexbase.add_to_callback('hyphenate',
function (head, _)
-- Apply default hyphenation (this is important for other languages).
lang.hyphenate(head)
-- Apply node list manipulation.
insert_primary_hyphenation_points(head, scan_node_list)
end,
'autotype primary hyphenation for '..lang_name)
end
end
local function weighted_hyph(lang_name, lang_num)
-- Clear the language's patterns to avoid insertion of hyphenation points by TeX
clear_patterns(lang_name)
local scan_node_list_i = padrinoma.create_node_list_scanner(
lang_num or lang_name,
get_hyphenation_pattern_file(lang_name, lang_num, '-primary'),
LEFTHYPHENMIN, RIGHTHYPHENMIN
)
local scan_node_list_ii = padrinoma.create_node_list_scanner(
lang_num or lang_name,
get_hyphenation_pattern_file(lang_name, lang_num, '-secondary'),
LEFTHYPHENMIN, RIGHTHYPHENMIN
)
-- The tertiary hyphenation patterns are the default patterns of LuaTeX, e.g. "hyph-de-1996.pat.txt".
local scan_node_list_iii = padrinoma.create_node_list_scanner(
lang_num or lang_name,
get_hyphenation_pattern_file(lang_name, lang_num, ''),
LEFTHYPHENMIN, RIGHTHYPHENMIN
)
-- Remove primary hyphenation from hyphenate callback
if luatexbase.in_callback('hyphenate', 'autotype primary hyphenation for '..lang_name) then
luatexbase.remove_from_callback('hyphenate', 'autotype primary hyphenation for '..lang_name)
end
-- Register callback for weighted hyphenation
if not luatexbase.in_callback('hyphenate', 'autotype weighted hyphenation for '..lang_name) then
luatexbase.add_to_callback('hyphenate',
function (head, _)
-- Apply default hyphenation (this is important for other languages).
lang.hyphenate(head)
-- Apply node list manipulation.
insert_weighted_hyphenation_points(head, scan_node_list_i,
scan_node_list_ii, scan_node_list_iii)
end,
'autotype weighted hyphenation for '..lang_name)
end
end
local function mark_hyph(lang_name)
luatexbase.add_to_callback('post_linebreak_filter',
function(head, _)
mark_hyphenation_points(head, lang_name)
return true
end,
'autotype marking of hyphenation points for '..lang_name)
end
local function ligbreak(lang_name, lang_num)
local pattern_file = 'autotype-ligbreak-de.pat.txt' -- TO DO: adapt to language
local scan_node_list = padrinoma.create_node_list_scanner(lang_num or lang_name, pattern_file, 2, 2)
-- Remove callback for regular ligaturing if present
if luatexbase.in_callback('ligaturing', 'TeX ligaturing') then
luatexbase.remove_from_callback('ligaturing', 'TeX ligaturing')
end
-- Register callback for preventing ligatures
luatexbase.add_to_callback('ligaturing',
function (head, _)
-- Apply node list manipulation.
break_ligatures(head, scan_node_list, lang_name)
end,
'autotype ligaturing for '..lang_name)
-- Register callback for regular ligaturing
luatexbase.add_to_callback('ligaturing',
function (head, _)
node.ligaturing(head)
end,
'TeX ligaturing')
end
local function long_s(lang_name, lang_num)
local pattern_file = 'autotype-round-s-de.pat.txt' -- TO DO: adapt to language
local scan_node_list = padrinoma.create_node_list_scanner(lang_num or lang_name, pattern_file, 0, 0)
-- Remove callback for regular ligaturing if present
if luatexbase.in_callback('ligaturing', 'TeX ligaturing') then
luatexbase.remove_from_callback('ligaturing', 'TeX ligaturing')
end
-- Register callback for long s insertion
luatexbase.add_to_callback('ligaturing',
function (head, _)
-- Apply node list manipulation.
insert_long_s(head, scan_node_list, lang_name)
end,
'autotype long s replacement for '..lang_name)
-- Register callback for regular ligaturing
luatexbase.add_to_callback('ligaturing',
function (head, _)
node.ligaturing(head)
end,
'TeX ligaturing')
end
local function get_penalty(i)
if i==1 then return PENALTY_I
elseif i==2 then return PENALTY_II
elseif i==3 then return PENALTY_III
end
end
local autotype = {}
autotype.default_hyph = default_hyph
autotype.primary_hyph = primary_hyph
autotype.weighted_hyph = weighted_hyph
autotype.mark_hyph = mark_hyph
autotype.ligbreak = ligbreak
autotype.long_s = long_s
autotype.set_long_s_codepoint = set_long_s_codepoint
autotype.set_round_s_codepoint = set_round_s_codepoint
autotype.set_final_round_s_codepoint = set_final_round_s_codepoint
autotype.get_current_long_s_codepoint = get_current_long_s_codepoint
autotype.get_current_round_s_codepoint = get_current_round_s_codepoint
autotype.get_penalty = get_penalty
return autotype
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