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|
--
-- This is file `ecclesiasticlatin.lua',
-- generated with the docstrip utility.
--
-- The original source files were:
--
-- latin.dtx (with options: `lua')
--
-- The original version of the following Lua code has been written for the
-- polyglossia package by É. Roux and others. The code has been adapted for
-- the babel-latin package by K. Wehr.
--
-- Copyright (C) 2021 by Keno Wehr
-- All rights reserved.
--
-- This file is part of the babel-latin package.
-- ----------------------------------------------
--
-- It 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 2003/12/01 or later.
--
-- This work has the LPPL maintenance status "maintained".
--
-- The Current Maintainer of this work is Keno Wehr.
--
-- Please report errors to: https://github.com/wehro/babel-latin/issues
--
luatexbase.provides_module({
name = "ecclesiasticlatin",
date = "2021-06-27",
version = "4.0",
description = "babel-latin punctuation spacing for ecclesiastic Latin"
})
local add_to_callback = luatexbase.add_to_callback
local in_callback = luatexbase.in_callback
local new_attribute = luatexbase.new_attribute
local node = node
local insert_node_before = node.insert_before
local insert_node_after = node.insert_after
local remove_node = node.remove
local has_attribute = node.has_attribute
local node_copy = node.copy
local new_node = node.new
local end_of_math = node.end_of_math
local get_next = node.getnext
local get_prev = node.getprev
local get_property = node.getproperty
local glue_code = node.id"glue"
local glyph_code = node.id"glyph"
local penalty_code = node.id"penalty"
local kern_code = node.id"kern"
local math_code = node.id"math"
local userkern = 1
local removable_skip = {
[0] = true, -- userskip
[13] = true, -- spaceskip
[14] = true -- xspaceskip
}
local kern_node = new_node(kern_code)
kern_node.subtype = userkern
local function get_kern_node(dim)
local n = node_copy(kern_node)
n.kern = dim
return n
end
local space_chars = {
[0x20] = true, -- space
[0xA0] = true, -- no-break space
[0x1680] = true, -- ogham space mark
[0x2000] = true, -- en quad
[0x2001] = true, -- em quad
[0x2002] = true, -- en space
[0x2003] = true, -- em space
[0x2004] = true, -- three-per-em-space
[0x2005] = true, -- four-per-em space
[0x2006] = true, -- six-per-em space
[0x2007] = true, -- figure space
[0x2008] = true, -- punctuation space
[0x2009] = true, -- thin space
[0x200A] = true, -- hair space
[0x202F] = true, -- narrow no-break space
[0x205F] = true, -- medium mathematical space
[0x3000] = true -- ideographic space
}
local left_bracket_chars = {
[0x28] = true, -- left parenthesis
[0x5B] = true, -- left square bracket
[0x7B] = true, -- left curly bracket
[0x27E8] = true -- mathematical left angle bracket
}
local right_bracket_chars = {
[0x29] = true, -- right parenthesis
[0x5D] = true, -- right square bracket
[0x7D] = true, -- right curly bracket
[0x27E9] = true -- mathematical right angle bracket
}
local question_exclamation_chars = {
[0x21] = true, -- exclamation mark !
[0x3F] = true, -- question mark ?
[0x203C] = true, -- double exclamation mark ‼
[0x203D] = true, -- interrobang ‽
[0x2047] = true, -- double question mark ⁇
[0x2048] = true, -- question exclamation mark ⁈
[0x2049] = true -- exclamation question mark ⁉
}
local function somespace(n)
if n then
local id, subtype = n.id, n.subtype
if id == glue_code then
return removable_skip[subtype]
elseif id == kern_code then
return subtype == userkern
elseif id == glyph_code then
return space_chars[n.char]
end
end
end
local function someleftbracket(n)
if n then
local id = n.id
if id == glyph_code then
return left_bracket_chars[n.char]
end
end
end
local function somerightbracket(n)
if n then
local id = n.id
if id == glyph_code then
return right_bracket_chars[n.char]
end
end
end
local function question_exclamation_sequence(n1, n2)
if n1 and n2 then
local id1 = n1.id
local id2 = n2.id
if id1 == glyph_code and id2 == glyph_code then
return question_exclamation_chars[n1.char] and question_exclamation_chars[n2.char]
end
end
end
local function somepenalty(n, value)
if n then
local id = n.id
if id == penalty_code then
if value then
return n.penalty == value
else
return true
end
end
end
end
local punct_attr = new_attribute("ecclesiasticlatin_punct")
local left_space = {}
local right_space = {}
local function process(head)
local current = head
while current do
local id = current.id
if id == glyph_code then
if has_attribute(current, punct_attr) then
local char = get_property(current) and get_property(current).glyph_info
if not char and current.char <= 0x10FFFF then
char = utf8.char(current.char)
end
local leftspace, rightspace
if char then
leftspace = left_space[char]
rightspace = right_space[char]
end
if leftspace or rightspace then
local fontparameters = fonts.hashes.parameters[current.font]
local spacing_node
if leftspace and fontparameters then
local prev = get_prev(current)
local space_exception = false
if prev then
space_exception = someleftbracket(prev)
or question_exclamation_sequence(prev, current)
while somespace(prev) do
head = remove_node(head, prev)
prev = get_prev(current)
end
if somepenalty(prev, 10000) then
head = remove_node(head, prev)
end
end
spacing_node = get_kern_node(leftspace * fontparameters.quad)
if not space_exception then
head = insert_node_before(head, current, spacing_node)
end
end
if rightspace and fontparameters then
local next = get_next(current)
local space_exception = false
if next then
space_exception = somerightbracket(next)
local nextnext = get_next(next)
if somepenalty(next, 10000) and somespace(nextnext) then
head, next = remove_node(head, next)
end
while somespace(next) do
head, next = remove_node(head, next)
end
end
spacing_node = get_kern_node(rightspace * fontparameters.quad)
if not space_exception then
head, current = insert_node_after(head, current, spacing_node)
end
end
end
end
elseif id == math_code then
current = end_of_math(current)
end
current = get_next(current)
end
return head
end
local hairspace = 0.08333 -- 1/12
local function space_left(char)
left_space[char] = hairspace
end
local function space_right(char, kern)
right_space[char] = hairspace
end
space_left('!')
space_left('?')
space_left('‼')
space_left('⁇')
space_left('⁈')
space_left('⁉')
space_left('‽') -- U+203D (interrobang)
space_left(':')
space_left(';')
space_left('»')
space_left('›')
space_right('«')
space_right('‹')
local function activate()
tex.setattribute(punct_attr, 1)
for _, callback_name in ipairs{ "pre_linebreak_filter", "hpack_filter" } do
if not in_callback(callback_name, "ecclesiasticlatin-punct.process") then
add_to_callback(callback_name, process, "ecclesiasticlatin-punct.process", 1)
end
end
end
local function deactivate()
tex.setattribute(punct_attr, -0x7FFFFFFF) -- this value means "unset"
end
ecclesiasticlatin = ecclesiasticlatin or {}
ecclesiasticlatin.activate_spacing = activate
ecclesiasticlatin.deactivate_spacing = deactivate
|
