4 luatexbase.provides_module({
5 name = 'luatexja.jfont',
8 description = 'Loader for Japanese fonts',
10 module('luatexja.jfont', package.seeall)
12 require('luatexja.base'); local ltjb = luatexja.base
13 require('luatexja.charrange'); local ltjc = luatexja.charrange
15 local node_new = node.new
16 local has_attr = node.has_attribute
17 local round = tex.round
19 local attr_icflag = luatexbase.attributes['ltj@icflag']
20 local attr_curjfnt = luatexbase.attributes['ltj@curjfnt']
21 local id_glyph = node.id('glyph')
22 local id_kern = node.id('kern')
25 ------------------------------------------------------------------------
27 ------------------------------------------------------------------------
29 metrics={} -- this table stores all metric informations
30 font_metric_table={} -- [font number] -> jfm_name, jfm_var, size
32 local jfm_file_name, jfm_var
35 function define_jfm(t)
36 local real_char -- Does current character class have the 'real' character?
38 defjfm_res= nil; return
39 elseif type(t.zw)~='number' or type(t.zh)~='number' then
40 defjfm_res= nil; return
42 t.char_type = {}; t.chars = {}
43 for i,v in pairs(t) do
44 if type(i) == 'number' then -- char_type
46 if i ~= 0 then defjfm_res= nil; return end
50 for j,w in pairs(v.chars) do
51 if w == 'lineend' then
52 if #v.chars ~= 1 then defjfm_res= nil; return end
53 elseif type(w) == 'number' then
55 elseif type(w) == 'string' and utf.len(w)==1 then
56 real_char = true; w = utf.byte(w)
58 if not t.chars[w] then
61 defjfm_res= nil; return
65 if not (type(v.width)=='number' or v.width~='prop') then
66 defjfm_res= nil; return
67 elseif type(v.height)~='number' or type(v.depth)~='number' then
68 defjfm_res= nil; return
73 if v.kern and v.glue then
74 for j,w in pairs(v.glue) do
75 if v.kern[j] then defjfm_res= nil; return end
85 function find_char_class(c,m)
86 -- c: character code, m
87 if not metrics[m] then return 0 end
88 return metrics[m].chars[c] or 0
91 local function load_jfont_metric()
92 if jfm_file_name=='' then
93 ltjb.package_error('luatexja',
95 {'To load and define a Japanese font, a JFM must be specified.',
96 "The JFM 'ujis' will be used for now."})
99 for j,v in ipairs(metrics) do
100 if v.name==jfm_file_name then return j end
102 ltj.loadlua('jfm-' .. jfm_file_name .. '.lua')
104 defjfm_res.name = jfm_file_name
105 table.insert(metrics, defjfm_res)
113 ------------------------------------------------------------------------
114 -- LOADING JAPANESE FONTS
115 ------------------------------------------------------------------------
119 function jfontdefX(g)
120 local t = token.get_next()
121 cstemp=token.csname_name(t)
122 if g then ltj.is_global = '\\global' else ltj.is_global = '' end
123 tex.sprint('\\expandafter\\font\\csname ' .. cstemp .. '\\endcsname')
127 function jfontdefY() -- for horizontal font
128 local j = load_jfont_metric()
129 local fn = font.id(cstemp)
130 local f = font.fonts[fn]
132 ltjb.package_error('luatexja',
133 "bad JFM `" .. jfm_file_name .. "'",
134 'The JFM file you specified is not valid JFM file.\n'..
135 'So defining Japanese font is cancelled.')
136 tex.sprint(ltj.is_global .. '\\expandafter\\let\\csname '
137 .. cstemp .. '\\endcsname=\\relax')
140 font_metric_table[fn]={}
141 font_metric_table[fn].jfm=j
142 font_metric_table[fn].size=f.size
143 font_metric_table[fn].var=jfm_var
144 tex.sprint(ltj.is_global .. '\\protected\\expandafter\\def\\csname '
145 .. cstemp .. '\\endcsname'
146 .. '{\\csname ltj@curjfnt\\endcsname=' .. fn
147 .. ' \\zw=' .. round(f.size*metrics[j].zw) .. 'sp'
148 .. '\\zh=' .. round(f.size*metrics[j].zh) .. 'sp\\relax}')
151 -- extract jfm_file_name and jfm_var
152 local function extract_metric(name)
154 local tmp = utf.sub(basename, 1, 5)
155 jfm_file_name = ''; jfm_var = ''
156 if tmp == 'file:' or tmp == 'name:' or tmp == 'psft:' then
157 basename = utf.sub(basename, 6)
159 local p = utf.find(basename, ":")
161 basename = utf.sub(basename, p+1)
164 -- now basename contains 'features' only.
167 local q = utf.find(basename, ";", p+1) or utf.len(basename)+1
168 if utf.sub(basename, p, p+3)=='jfm=' and q>p+4 then
169 jfm_file_name = utf.sub(basename, p+4, q-1)
170 elseif utf.sub(basename, p, p+6)=='jfmvar=' and q>p+6 then
171 jfm_var = utf.sub(basename, p+7, q-1)
173 if utf.len(basename)+1==q then p = nil else p = q + 1 end
178 -- replace fonts.define.read()
179 local ljft_dr_orig = fonts.define.read
180 function fonts.define.read(name, size, id)
182 -- In the present imple., we don't remove "jfm=..." from name.
183 return ljft_dr_orig(name, size, id)
186 ------------------------------------------------------------------------
188 ------------------------------------------------------------------------
190 -- EXT: italic correction
191 function append_italic()
192 local p = tex.nest[tex.nest.ptr].tail
193 if p and p.id==id_glyph then
195 local g = node_new(id_kern)
196 g.subtype = 1; node.set_attribute(g, attr_icflag, ITALIC)
197 if ltjc.is_ucs_in_japanese_char(p) then
198 f = has_attr(p, attr_curjfnt)
199 local j = font_metric_table[f]
200 local c = find_char_class(p.char, j.jfm)
201 g.kern = round(j.size * metrics[j.jfm].char_type[c].italic)
203 g.kern = font.fonts[f].characters[p.char].italic