97 lines
2.4 KiB
Lua
97 lines
2.4 KiB
Lua
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local whatsit_id = node.id'whatsit'
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local whatsits = {
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[0] = "open",
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"write",
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"close",
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"special",
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nil,
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nil,
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"save_pos",
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"late_lua",
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"user_defined",
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nil,
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nil,
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nil,
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nil,
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nil,
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nil,
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nil,
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"pdf_literal",
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"pdf_refobj",
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"pdf_annot",
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"pdf_start_link",
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"pdf_end_link",
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"pdf_dest",
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"pdf_action",
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"pdf_thread",
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"pdf_start_thread",
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"pdf_end_thread",
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"pdf_thread_data",
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"pdf_link_data",
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"pdf_colorstack",
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"pdf_setmatrix",
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"pdf_save",
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"pdf_restore",
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}
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local whatsithandler = {}
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-- for i = 0,#whatsits do -- #whatsits isn't guaranteed to work because of the nil entries
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for i = 0,31 do
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local v = whatsits[i]
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if v then
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whatsits[v] = i
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end
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end
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function node.whatsits() return whatsits end
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function node.subtype(s) return type(s) == "string" and whatsits[s] or nil end
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local direct = node.direct
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local getsubtype = direct.getsubtype
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local properties = direct.get_properties_table()
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local tonode, todirect = direct.tonode, direct.todirect
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local function get_handler(n, subtype)
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local props = properties[n]
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return props and props.handle or whatsithandler[subtype or getsubtype(n)], props
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end
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local function new(name, handler)
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assert(type(name) == 'string')
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local subtype = whatsits[name]
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if subtype then
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if whatsithandler[subtype] then
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texio.write_nl'WARNING: Overwriting default whatsit handler'
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end
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else
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subtype = #whatsits + 1
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whatsits[subtype] = name
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whatsits[name] = subtype
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end
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whatsithandler[subtype] = handler
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return subtype
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end
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-- TODO: Some fields might expect different values
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local function setwhatsitfield(n, name, value)
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local props = properties[n]
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if not props then
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props = {}
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properties[n] = props
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end
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props[name] = value
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end
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direct.setwhatsitfield = setwhatsitfield
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local function getwhatsitfield(n, name)
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local props = properties[n]
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return props and props[name]
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end
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direct.getwhatsitfield = getwhatsitfield
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-- TODO: Some fields might be nodes and therefore have to be converted
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function node.setwhatsitfield(n, ...) return setwhatsitfield(todirect(n), ...) end
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function node.getwhatsitfield(n, ...) return getwhatsitfield(todirect(n), ...) end
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return {
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handler = get_handler,
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new = new,
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}
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