diff options
Diffstat (limited to 'src/luaotfload-basics-nod.lua')
| -rw-r--r-- | src/luaotfload-basics-nod.lua | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/src/luaotfload-basics-nod.lua b/src/luaotfload-basics-nod.lua new file mode 100644 index 0000000..50a1e86 --- /dev/null +++ b/src/luaotfload-basics-nod.lua @@ -0,0 +1,167 @@ +if not modules then modules = { } end modules ['luatex-fonts-nod'] = { + version = 1.001, + comment = "companion to luatex-fonts.lua", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +if context then + texio.write_nl("fatal error: this module is not for context") + os.exit() +end + +-- Don't depend on code here as it is only needed to complement the +-- font handler code. + +-- Attributes: + +if tex.attribute[0] ~= 0 then + + texio.write_nl("log","!") + texio.write_nl("log","! Attribute 0 is reserved for ConTeXt's font feature management and has to be") + texio.write_nl("log","! set to zero. Also, some attributes in the range 1-255 are used for special") + texio.write_nl("log","! purposes so setting them at the TeX end might break the font handler.") + texio.write_nl("log","!") + + tex.attribute[0] = 0 -- else no features + +end + +attributes = attributes or { } +attributes.unsetvalue = -0x7FFFFFFF + +local numbers, last = { }, 127 + +attributes.private = attributes.private or function(name) + local number = numbers[name] + if not number then + if last < 255 then + last = last + 1 + end + number = last + numbers[name] = number + end + return number +end + +-- Nodes: + +nodes = { } +nodes.pool = { } +nodes.handlers = { } + +local nodecodes = { } for k,v in next, node.types () do nodecodes[string.gsub(v,"_","")] = k end +local whatcodes = { } for k,v in next, node.whatsits() do whatcodes[string.gsub(v,"_","")] = k end +local glyphcodes = { [0] = "character", "glyph", "ligature", "ghost", "left", "right" } + +nodes.nodecodes = nodecodes +nodes.whatcodes = whatcodes +nodes.whatsitcodes = whatcodes +nodes.glyphcodes = glyphcodes + +local free_node = node.free +local remove_node = node.remove +local new_node = node.new +local traverse_id = node.traverse_id + +local math_code = nodecodes.math + +nodes.handlers.protectglyphs = node.protect_glyphs +nodes.handlers.unprotectglyphs = node.unprotect_glyphs + +function nodes.remove(head, current, free_too) + local t = current + head, current = remove_node(head,current) + if t then + if free_too then + free_node(t) + t = nil + else + t.next, t.prev = nil, nil + end + end + return head, current, t +end + +function nodes.delete(head,current) + return nodes.remove(head,current,true) +end + +function nodes.pool.kern(k) + local n = new_node("kern",1) + n.kern = k + return n +end + +-- experimental + +local getfield = node.getfield or function(n,tag) return n[tag] end +local setfield = node.setfield or function(n,tag,value) n[tag] = value end + +nodes.getfield = getfield +nodes.setfield = setfield + +nodes.getattr = getfield +nodes.setattr = setfield + +if node.getid then nodes.getid = node.getid else function nodes.getid (n) return getfield(n,"id") end end +if node.getsubtype then nodes.getsubtype = node.getsubtype else function nodes.getsubtype(n) return getfield(n,"subtype") end end +if node.getnext then nodes.getnext = node.getnext else function nodes.getnext (n) return getfield(n,"next") end end +if node.getprev then nodes.getprev = node.getprev else function nodes.getprev (n) return getfield(n,"prev") end end +if node.getchar then nodes.getchar = node.getchar else function nodes.getchar (n) return getfield(n,"char") end end +if node.getfont then nodes.getfont = node.getfont else function nodes.getfont (n) return getfield(n,"font") end end +if node.getlist then nodes.getlist = node.getlist else function nodes.getlist (n) return getfield(n,"list") end end + +function nodes.tonut (n) return n end +function nodes.tonode(n) return n end + +-- being lazy ... just copy a bunch ... not all needed in generic but we assume +-- nodes to be kind of private anyway + +nodes.tostring = node.tostring or tostring +nodes.copy = node.copy +nodes.copy_list = node.copy_list +nodes.delete = node.delete +nodes.dimensions = node.dimensions +nodes.end_of_math = node.end_of_math +nodes.flush_list = node.flush_list +nodes.flush_node = node.flush_node +nodes.free = node.free +nodes.insert_after = node.insert_after +nodes.insert_before = node.insert_before +nodes.hpack = node.hpack +nodes.new = node.new +nodes.tail = node.tail +nodes.traverse = node.traverse +nodes.traverse_id = node.traverse_id +nodes.slide = node.slide +nodes.vpack = node.vpack + +nodes.first_glyph = node.first_glyph +nodes.first_character = node.first_character +nodes.has_glyph = node.has_glyph or node.first_glyph + +nodes.current_attr = node.current_attr +nodes.do_ligature_n = node.do_ligature_n +nodes.has_field = node.has_field +nodes.last_node = node.last_node +nodes.usedlist = node.usedlist +nodes.protrusion_skippable = node.protrusion_skippable +nodes.write = node.write + +nodes.has_attribute = node.has_attribute +nodes.set_attribute = node.set_attribute +nodes.unset_attribute = node.unset_attribute + +nodes.protect_glyphs = node.protect_glyphs +nodes.unprotect_glyphs = node.unprotect_glyphs +nodes.kerning = node.kerning +nodes.ligaturing = node.ligaturing +nodes.mlist_to_hlist = node.mlist_to_hlist + +-- in generic code, at least for some time, we stay nodes, while in context +-- we can go nuts (e.g. experimental); this split permits us us keep code +-- used elsewhere stable but at the same time play around in context + +nodes.nuts = nodes |