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if not modules then modules = { } end modules ['back-pdf'] = {
version = 1.001,
comment = "companion to lpdf-ini.tex",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- This code is very experimental !
local setmetatable, getmetatable, type, next, tostring, tonumber = setmetatable, getmetatable, type, next, tostring, tonumber
local char, byte, format, gsub, concat = string.char, string.byte, string.format, string.gsub, table.concat
local utfvalues = string.utfvalues
lpdf = lpdf or { }
local function tosixteen(str)
if not str or str == "" then
return "()"
else
local r = { "<feff" }
for b in utfvalues(str) do
if b < 0x10000 then
r[#r+1] = format("%04x",b)
else
r[#r+1] = format("%04x%04x",b/1024+0xD800,b%1024+0xDC00)
end
end
r[#r+1] = ">"
return concat(r)
end
end
local function merge_t(a,b)
local t = { }
for k,v in next, a do t[k] = v end
for k,v in next, b do t[k] = v end
return setmetatable(t,getmetatable(a))
end
local tostring_a, tostring_d
tostring_d = function(t)
if not next(t) then
return "<< >>"
else
local r = { "<<" }
for k, v in next, t do
local tv = type(v)
if tv == "string" then
r[#r+1] = format("/%s %s",k,tosixteen(v))
elseif tv == "table" then
local mv = getmetatable(v)
if mv and mv.__lpdftype then
r[#r+1] = format("/%s %s",k,tostring(v))
elseif v[1] then
r[#r+1] = format("/%s %s",k,tostring_a(v))
else
r[#r+1] = format("/%s %s",k,tostring_d(v))
end
else
r[#r+1] = format("/%s %s",k,tostring(v))
end
end
r[#r+1] = ">>"
return concat(r, " ")
end
end
tostring_a = function(t)
if #t == 0 then
return "[ ]"
else
local r = { "[" }
for k, v in next, t do
local tv = type(v)
if tv == "string" then
r[#r+1] = tosixteen(v)
elseif tv == "table" then
local mv = getmetatable(v)
if mv and mv.__lpdftype then
r[#r+1] = tostring(v)
elseif v[1] then
r[#r+1] = tostring_a(v)
else
r[#r+1] = tostring_d(v)
end
else
r[#r+1] = tostring(v)
end
end
r[#r+1] = "]"
return concat(r, " ")
end
end
local tostring_s = function(t) return tosixteen(t[1]) end
local tostring_n = function(t) return tostring(t[1]) end -- tostring not needed
local tostring_c = function(t) return t[1] end -- already prefixed (hashed)
local tostring_z = function() return "null" end
local tostring_t = function() return "true" end
local tostring_f = function() return "false" end
local function value_s(t) return t[1] end -- the call is experimental
local function value_n(t) return t[1] end -- the call is experimental
local function value_c(t) return sub(t[1],2) end -- the call is experimental
local function value_d(t) return t end -- the call is experimental
local function value_a(t) return t end -- the call is experimental
local function value_z() return nil end -- the call is experimental
local function value_t() return true end -- the call is experimental
local function value_b() return false end -- the call is experimental
local mt_d = { __lpdftype = "dictionary", __tostring = tostring_d, __call = value_d }
local mt_a = { __lpdftype = "array", __tostring = tostring_a, __call = value_a }
local mt_s = { __lpdftype = "string", __tostring = tostring_s, __call = value_s }
local mt_n = { __lpdftype = "number", __tostring = tostring_n, __call = value_n }
local mt_c = { __lpdftype = "constant", __tostring = tostring_c, __call = value_c }
local mt_z = { __lpdftype = "null", __tostring = tostring_z, __call = value_z }
local mt_t = { __lpdftype = "true", __tostring = tostring_t, __call = value_t }
local mt_f = { __lpdftype = "false", __tostring = tostring_f, __call = value_f }
function lpdf.dictionary(t)
return setmetatable(t or { },mt_d)
end
function lpdf.array(t)
return setmetatable(t or { },mt_a)
end
local cache = { } -- can be weak
function lpdf.string(str,default)
str = str or default or ""
local c = cache[str]
if not c then
c = setmetatable({ str },mt_s)
cache[str] = c
end
return c
end
local cache = { } -- can be weak
function lpdf.number(n,default) -- 0-10
n = n or default
local c = cache[n]
if not c then
c = setmetatable({ n },mt_n)
-- cache[n] = c -- too many numbers
end
return c
end
for i=-1,9 do cache[i] = lpdf.number(i) end
local cache = { } -- can be weak
function lpdf.constant(str,default)
str = str or default or ""
local c = cache[str]
if not c then
c = setmetatable({ "/" .. str },mt_c)
cache[str] = c
end
return c
end
local p_null = { } setmetatable(p_null, mt_z)
local p_true = { } setmetatable(p_true, mt_t)
local p_false = { } setmetatable(p_false,mt_f)
function lpdf.null()
return p_null
end
function lpdf.boolean(b,default)
if ((type(b) == boolean) and b) or default then
return p_true
else
return p_false
end
end
--~ local d = lpdf.dictionary()
--~ local e = lpdf.dictionary { ["e"] = "abc" }
--~ local f = lpdf.dictionary { ["f"] = "ABC" }
--~ local a = lpdf.array()
--~ d["test"] = lpdf.string ("test")
--~ d["more"] = "more"
--~ d["bool"] = true
--~ d["numb"] = 1234
--~ d["oeps"] = lpdf.dictionary { ["hans"] = "ton" }
--~ d["whow"] = lpdf.array { lpdf.string("ton") }
--~ a[#a+1] = lpdf.string("xxx")
--~ a[#a+1] = lpdf.string("yyy")
--~ d.what = a
--~ print(d)
--~ local d = lpdf.dictionary()
--~ d["abcd"] = { 1, 2, 3, "test" }
--~ print(d)
--~ local d = lpdf.array()
--~ d[#d+1] = { 1, 2, 3, "test" }
--~ print(d)
--~ local d = lpdf.array()
--~ d[#d+1] = { a=1, b=2, c=3, d="test" }
--~ print(d)
--~ local s = lpdf.boolean(false)
--~ print(s()) -- fails somehow
function lpdf.checkedkey(t,key,kind)
local pn = t[key]
if pn then
local tn = type(pn)
if tn == kind then
if kind == "string" then
return pn ~= "" and pn
elseif kind == "table" then
return next(pn) and pn
else
return pn
end
elseif tn == "string" and kind == "number" then
return tonumber(pn)
end
end
end
function lpdf.checkedvalue(value,kind) -- code not shared
if value then
local tv = type(value)
if tv == kind then
if kind == "string" then
return value ~= "" and value
elseif kind == "table" then
return next(value) and value
else
return value
end
elseif tv == "string" and kind == "number" then
return tonumber(value)
end
end
end
function lpdf.limited(n,min,max,default)
if not n then
return default
else
n = tonumber(n)
if not n then
return default
elseif n > max then
return max
elseif n < min then
return min
else
return n
end
end
end
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