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|
if not modules then modules = { } end modules ['mlib-lua'] = {
version = 1.001,
comment = "companion to mlib-ctx.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files",
}
-- This is very preliminary code!
-- maybe we need mplib.model, but how with instances
local type, tostring, select, loadstring = type, tostring, select, loadstring
local find, gsub = string.find, string.gsub
local formatters = string.formatters
local concat = table.concat
local lpegmatch = lpeg.match
local P, S, Ct = lpeg.P, lpeg.S, lpeg.Ct
local report_luarun = logs.reporter("metapost","lua")
local trace_luarun = false trackers.register("metapost.lua",function(v) trace_luarun = v end)
local trace_enabled = true
local be_tolerant = true directives.register("metapost.lua.tolerant",function(v) be_tolerant = v end)
mp = mp or { } -- system namespace
MP = MP or { } -- user namespace
local buffer, n, max = { }, 0, 10 -- we reuse upto max
function mp._f_()
if trace_enabled and trace_luarun then
local result = concat(buffer," ",1,n)
if n > max then
buffer = { }
end
n = 0
report_luarun("data: %s",result)
return result
else
if n == 0 then
return ""
end
local result
if n == 1 then
result = buffer[1]
else
result = concat(buffer," ",1,n)
end
if n > max then
buffer = { }
end
n = 0
return result
end
end
local f_code = formatters["%s return mp._f_()"]
local f_numeric = formatters["%.16f"]
local f_pair = formatters["(%.16f,%.16f)"]
local f_triplet = formatters["(%.16f,%.16f,%.16f)"]
local f_quadruple = formatters["(%.16f,%.16f,%.16f,%.16f)"]
function mp.print(...)
for i=1,select("#",...) do
local value = select(i,...)
if value ~= nil then
n = n + 1
local t = type(value)
if t == "number" then
buffer[n] = f_numeric(value)
elseif t == "string" then
buffer[n] = value
elseif t == "table" then
buffer[n] = "(" .. concat(value,",") .. ")"
else -- boolean or whatever
buffer[n] = tostring(value)
end
end
end
end
function mp.boolean(n)
n = n + 1
buffer[n] = n and "true" or "false"
end
function mp.numeric(n)
n = n + 1
buffer[n] = n and f_numeric(n) or "0"
end
function mp.pair(x,y)
n = n + 1
if type(x) == "table" then
buffer[n] = f_pair(x[1],x[2])
else
buffer[n] = f_pair(x,y)
end
end
function mp.triplet(x,y,z)
n = n + 1
if type(x) == "table" then
buffer[n] = f_triplet(x[1],x[2],x[3])
else
buffer[n] = f_triplet(x,y,z)
end
end
function mp.quadruple(w,x,y,z)
n = n + 1
if type(w) == "table" then
buffer[n] = f_quadruple(w[1],w[2],w[3],w[4])
else
buffer[n] = f_quadruple(w,x,y,z)
end
end
function mp.path(t,connector,cycle)
if type(t) == "table" then
local tn = #t
if tn > 0 then
if connector == true then
connector = "--"
cycle = true
elseif not connector then
connector = "--"
end
local ti = t[1]
n = n + 1 ; buffer[n] = f_pair(ti[1],ti[2])
for i=2,tn do
local ti = t[i]
n = n + 1 ; buffer[n] = connector
n = n + 1 ; buffer[n] = f_pair(ti[1],ti[2])
end
if cycle then
n = n + 1 ; buffer[n] = connector
n = n + 1 ; buffer[n] = "cycle"
end
end
end
end
function mp.size(t)
n = n + 1
buffer[n] = type(t) == "table" and f_numeric(#t) or "0"
end
-- experiment: names can change
local datasets = { }
mp.datasets = datasets
function datasets.load(tag,filename)
if not filename then
tag, filename = file.basename(tag), tag
end
local data = mp.dataset(io.loaddata(filename) or "")
datasets[tag] = {
Data = data,
Line = function(n) mp.path(data[n or 1]) end,
Size = function() mp.size(data) end,
}
end
--
local replacer = lpeg.replacer("@","%%")
function mp.format(fmt,...)
n = n + 1
if not find(fmt,"%%") then
fmt = lpegmatch(replacer,fmt)
end
buffer[n] = formatters[fmt](...)
end
function mp.quoted(fmt,s,...)
n = n + 1
if s then
if not find(fmt,"%%") then
fmt = lpegmatch(replacer,fmt)
end
buffer[n] = '"' .. formatters[fmt](s,...) .. '"'
else
buffer[n] = '"' .. fmt .. '"'
end
end
function mp.n(t)
return type(t) == "table" and #t or 0
end
local whitespace = lpeg.patterns.whitespace
local newline = lpeg.patterns.newline
local setsep = newline^2
local comment = (S("#%") + P("--")) * (1-newline)^0 * (whitespace - setsep)^0
local value = (1-whitespace)^1 / tonumber
local entry = Ct( value * whitespace * value)
local set = Ct((entry * (whitespace-setsep)^0 * comment^0)^1)
local series = Ct((set * whitespace^0)^1)
local pattern = whitespace^0 * series
function mp.dataset(str)
return lpegmatch(pattern,str)
end
-- \startluacode
-- local str = [[
-- 10 20 20 20
-- 30 40 40 60
-- 50 10
--
-- 10 10 20 30
-- 30 50 40 50
-- 50 20 -- the last one
--
-- 10 20 % comment
-- 20 10
-- 30 40 # comment
-- 40 20
-- 50 10
-- ]]
--
-- MP.myset = mp.dataset(str)
--
-- inspect(MP.myset)
-- \stopluacode
--
-- \startMPpage
-- color c[] ; c[1] := red ; c[2] := green ; c[3] := blue ;
-- for i=1 upto lua("mp.print(mp.n(MP.myset))") :
-- draw lua("mp.path(MP.myset[" & decimal i & "])") withcolor c[i] ;
-- endfor ;
-- \stopMPpage
-- function metapost.runscript(code)
-- local f = loadstring(f_code(code))
-- if f then
-- local result = f()
-- if result then
-- local t = type(result)
-- if t == "number" then
-- return f_numeric(result)
-- elseif t == "string" then
-- return result
-- else
-- return tostring(result)
-- end
-- end
-- end
-- return ""
-- end
local cache, n = { }, 0 -- todo: when > n then reset cache or make weak
function metapost.runscript(code)
local trace = trace_enabled and trace_luarun
if trace then
report_luarun("code: %s",code)
end
local f
if n > 100 then
cache = nil -- forget about caching
f = loadstring(f_code(code))
if not f and be_tolerant then
f = loadstring(code)
end
else
f = cache[code]
if not f then
f = loadstring(f_code(code))
if f then
n = n + 1
cache[code] = f
elseif be_tolerant then
f = loadstring(code)
if f then
n = n + 1
cache[code] = f
end
end
end
end
if f then
local result = f()
if result then
local t = type(result)
if t == "number" then
t = f_numeric(result)
elseif t == "string" then
t = result
else
t = tostring(result)
end
if trace then
report_luarun("result: %s",code)
end
return t
elseif trace then
report_luarun("no result")
end
else
report_luarun("no result, invalid code")
end
return ""
end
-- function metapost.initializescriptrunner(mpx)
-- mp.numeric = function(s) return mpx:get_numeric(s) end
-- mp.string = function(s) return mpx:get_string (s) end
-- mp.boolean = function(s) return mpx:get_boolean(s) end
-- mp.number = mp.numeric
-- end
local get_numeric = mplib.get_numeric
local get_string = mplib.get_string
local get_boolean = mplib.get_boolean
local get_number = get_numeric
-- function metapost.initializescriptrunner(mpx)
-- mp.numeric = function(s) return get_numeric(mpx,s) end
-- mp.string = function(s) return get_string (mpx,s) end
-- mp.boolean = function(s) return get_boolean(mpx,s) end
-- mp.number = mp.numeric
-- end
local currentmpx = nil
local get = { }
mp.get = get
get.numeric = function(s) return get_numeric(currentmpx,s) end
get.string = function(s) return get_string (currentmpx,s) end
get.boolean = function(s) return get_boolean(currentmpx,s) end
get.number = mp.numeric
function metapost.initializescriptrunner(mpx,trialrun)
currentmpx = mpx
if trace_luarun then
report_luarun("type of run: %s", trialrun and "trial" or "final")
end
-- trace_enabled = not trialrun blocks too much
end
-- texts:
local factor = 65536*(7227/7200)
local textexts = nil
local mptriplet = mp.triplet
function mp.tt_initialize(tt)
textexts = tt
end
-- function mp.tt_wd(n)
-- local box = textexts and textexts[n]
-- mpprint(box and box.width/factor or 0)
-- end
-- function mp.tt_ht(n)
-- local box = textexts and textexts[n]
-- mpprint(box and box.height/factor or 0)
-- end
-- function mp.tt_dp(n)
-- local box = textexts and textexts[n]
-- mpprint(box and box.depth/factor or 0)
-- end
function mp.tt_dimensions(n)
local box = textexts[n]
if box then
-- could be made faster with nuts but not critical
mptriplet(box.width/factor,box.height/factor,box.depth/factor)
else
mptriplet(0,0,0)
end
end
|