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-- Copyright (c) 2022 Thomas Kelkel kelkel@emaileon.de
-- This file 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 2009/09/24 or later.
-- Version: 0.1
local FLOOR = math.floor
local function round ( num, dec )
return FLOOR ( num * 10^dec + 0.5 ) / 10^dec
end
local ID = node.id
local GLYPH = ID ( "glyph" )
local DISC = ID ( "disc" )
local KERN = ID ( "kern" )
local GLUE = ID ( "glue" )
local WI = ID ( "whatsit" )
local HLIST = ID ( "hlist" )
local VLIST = ID ( "vlist" )
local RIGHTSKIP = table.swapped ( node.subtypes ("glue") )["rightskip"]
local NEW = node.new
local COPY = node.copy
local REM = node.remove
local PREV = node.prev
local NEXT = node.next
local HAS_GLYPH = node.has_glyph
local INS_B = node.insert_before
local INS_A = node.insert_after
local T = node.traverse
local T_ID = node.traverse_id
local T_GLYPH = node.traverse_glyph
local WIS = node.whatsits()
local pdfliteral
local pairs = pairs
local GET_FONT = font.getfont
local ATC = luatexbase.add_to_callback
local make = false
local on_top = false
local DIR = PREV
local AB = INS_B
local f = 1
local color = "1 .25 .45"
function make_not_on_top ()
on_top = false
DIR = PREV
AB = INS_B
f = 1
end
function make_on_top ()
on_top = true
DIR = NEXT
AB = INS_A
f = - 1
end
local in_use = make_not_on_top
for key, value in pairs ( WIS ) do
if value == "pdf_literal" then
pdfliteral = key
end
end
function showhyphenation_make ()
make = true
end
function showhyphenation_on_top ()
in_use = make_on_top
in_use()
end
function showhyphenation_lime ()
color = ".75 1 .25"
end
local function calc_value ( value )
value = round ( value / 65536, 3 )
return value
end
local function get_x_value ( n, x_value, minus )
local exp_fac = 1
local f = 1
if minus then
f = - 1
end
if n.expansion_factor then
exp_fac = n.expansion_factor / 1000000 + 1
end
if n.id == GLYPH then
x_value = x_value + calc_value ( n.width ) * exp_fac * f
elseif n.id == KERN then
x_value = x_value + calc_value ( n.kern ) * exp_fac * f
end
return x_value
end
local line_end_count = 0
local function find_glyph ( n, d, kern_value )
local line_end = nil
local ligtype_mark = nil
if d ( n ) then
n = d ( n )
while not ( ( n.id == GLYPH and n.char ~= 45 ) or ( n.id == DISC and n.replace and HAS_GLYPH ( n.replace ) ) ) do
if n.width and not ( n.char and n.char == 45 ) then
kern_value = get_x_value ( n, kern_value ) -- rules, etc.
elseif n.kern then
kern_value = get_x_value ( n, kern_value ) * 0.5 -- hyphen kern
end
if n.char == 45 then
line_end = true
line_end_count = line_end_count + 1
end
if line_end and n.user_id == 848485 then
ligtype_mark = true
end
n = d ( n )
end
if n.replace then
local REPLACE = n.replace
for some_node in T ( REPLACE ) do
if some_node.width then
kern_value = get_x_value ( some_node, kern_value )
elseif some_node.kern then
kern_value = get_x_value ( some_node, kern_value )
end
end
else
if n.width then
kern_value = get_x_value ( n, kern_value )
end
end
end
return n, kern_value, ligtype_mark
end
local function check_linebreak ( n, d )
while n.id ~= GLYPH do
if d ( n ) then
n = d ( n )
else break end
end
if ( n.char == 45 and d == PREV ) or ( n.id == GLUE and n.subtype == RIGHTSKIP and d == NEXT ) then
make_not_on_top()
return true
end
end
local function hyphenation_points ( head )
for n in T ( head ) do
if n.id == HLIST or n.id == VLIST then
n.head = hyphenation_points ( n.head )
elseif n.id == DISC then
check_linebreak ( n, PREV )
check_linebreak ( n, NEXT )
local lig_add = 0
local prev_next_kern = 0
local prev_next_kern_lig = 0
if n.replace then
if not HAS_GLYPH ( n.replace ) then
local REPLACE = n.replace
for some_node in T ( REPLACE ) do
if some_node.kern and not ( check_linebreak ( n, DIR ) ) then
prev_next_kern_lig = get_x_value ( some_node, prev_next_kern_lig ) * 0.5
end
end
else
if n.post then
for glyph_node in T_GLYPH ( n.pre ) do
if glyph_node.width then
lig_add = get_x_value ( glyph_node, lig_add )
break -- hyphen!
end
end
if not on_top then
if n.replace.kern then
prev_next_kern_lig = get_x_value ( n.replace, prev_next_kern_lig )
end
end
else
if n.replace.kern then
prev_next_kern_lig = get_x_value ( n.replace, prev_next_kern_lig ) * 0.5
end
for glyph_node in T_GLYPH ( n.replace ) do -- short-armed f
if glyph_node.char ~= 45 then
lig_add = get_x_value ( glyph_node, lig_add )
end
end
end
if on_top then
for some_node in T ( n.replace ) do
if some_node.width then
lig_add = get_x_value ( some_node, lig_add, true )
elseif some_node.kern and some_node ~= n.replace then
lig_add = get_x_value ( some_node, lig_add, true )
end
end
end
end
end
local prev_next_glyph = n
local ligtype_mark = nil
prev_next_glyph, prev_next_kern, ligtype_mark = find_glyph ( prev_next_glyph, DIR, 0 )
head = AB ( head, prev_next_glyph, NEW ( WI, pdfliteral ) )
lig_add = lig_add + ( prev_next_kern + prev_next_kern_lig ) * f
DIR ( prev_next_glyph ).mode = 0
local size_factor = 1
if font.current() then
size_factor = calc_value ( GET_FONT ( font.current() ).size / 10 )
end
local DATA
if ( PREV ( n ) and PREV ( n ).user_id and PREV ( n ).user_id == 848485 ) or ligtype_mark then
DATA = "q " .. ( lig_add - 2 * size_factor ) .. " " .. -3 * size_factor .. " m " .. ( lig_add + 2 * size_factor ) .. " " .. -3 * size_factor .. " l " .. ( lig_add + 2 * size_factor ) .. " " .. -4 * size_factor .. " l " .. ( lig_add - 2 * size_factor ) .. " " .. -4 * size_factor .. " l " .. color .. " rg f Q"
else
DATA = "q " .. lig_add .. " 0 m " .. lig_add + 2 * size_factor .. " " .. -3 * size_factor .. " l " .. lig_add - 2 * size_factor .. " " .. -3 * size_factor .. " l " .. color .. " rg f Q"
end
DIR ( prev_next_glyph ).data = DATA
in_use()
end
end
return head
end
local function make_hyphens ( head )
for n in T_ID ( DISC, head ) do
local REPLACE = n.replace
for some_node in T ( REPLACE ) do
REM ( REPLACE, some_node )
end
local PRE = n.pre
for some_node in T_GLYPH ( PRE ) do
REPLACE = INS_A ( REPLACE, REPLACE, COPY ( some_node ) )
end
local POST = n.post
for some_node in T_GLYPH ( POST ) do
REPLACE = INS_A ( REPLACE, REPLACE, COPY ( some_node ) )
end
n.replace = REPLACE
end
end
function showhyphenation_start ()
if make then
ATC ( "ligaturing", make_hyphens, "make hyphens" )
else
ATC ( "post_linebreak_filter", hyphenation_points, "show hyphenation points in postline", 1 )
ATC ( "hpack_filter", hyphenation_points, "show hyphenation points in hpack" )
end
end
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