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|
if not modules then modules = { } end modules ['mlib-scn'] = {
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",
}
-- Very experimental, for Alan and me.
-- for i = 1 upto 32000 : % 0.062
-- ts := 5mm / 20;
-- endfor ;
--
-- for i = 1 upto 32000 : % 0.219
-- ts := (getparameter "axis" "sy") / 20;
-- endfor ;
--
-- for i = 1 upto 32000 : % 0.266
-- ts := (getparameterx "axis" "sy") / 20;
-- endfor ;
--
-- pushparameters "axis";
-- for i = 1 upto 32000 : % 0.250
-- ts := (getparameterx "sy") / 20;
-- endfor ;
-- popparameters;
local type, next, rawget, getmetatable = type, next, rawget, getmetatable
local byte, gmatch = string.byte, string.gmatch
local insert, remove = table.insert, table.remove
local mplib = mplib
local metapost = metapost
local codes = mplib.codes()
local types = mplib.types()
table.hashed(codes)
table.hashed(types)
metapost.codes = codes
metapost.types = types
local setmetatableindex = table.setmetatableindex
local scanners = mp.scan
local injectors = mp.inject
local scannext = scanners.next
local scanexpression = scanners.expression
local scantoken = scanners.token
local scansymbol = scanners.symbol
local scannumeric = scanners.numeric
local scannumber = scanners.number
local scaninteger = scanners.integer
local scanboolean = scanners.boolean
local scanstring = scanners.string
local scanpair = scanners.pair
local scancolor = scanners.color
local scancmykcolor = scanners.cmykcolor
local scantransform = scanners.transform
local scanpath = scanners.path
local scanpen = scanners.pen
local mpprint = mp.print
local injectnumeric = injectors.numeric
local injectstring = injectors.string
local injectboolean = injectors.boolean
local injectpair = injectors.pair
local injecttriplet = injectors.color
local injectquadruple = injectors.cmykcolor
local injecttransform = injectors.transform
local report = logs.reporter("metapost")
local semicolon_code = codes.semicolon
local equals_code = codes.equals
local comma_code = codes.comma
local colon_code = codes.colon
local leftbrace_code = codes.leftbrace
local rightbrace_code = codes.rightbrace
local leftbracket_code = codes.leftbracket
local rightbracket_code = codes.rightbracket
local leftdelimiter_code = codes.leftdelimiter
local rightdelimiter_code = codes.rightdelimiter
local numeric_code = codes.numeric
local string_code = codes.string
local capsule_code = codes.capsule
local nullary_code = codes.nullary
local tag_code = codes.tag
local definedmacro_code = codes.definedmacro
local typescanners = nil
local tokenscanners = nil
local scanset = nil
local scanparameters = nil
local injectpath = mp.path
do -- todo: this will become an overload
local flush = mp.path
local inject = injectors.path -- work in progress
injectpath = function(p,connector,close)
if #p > 1 then
if connector == true or connector == ".." then
return inject(p,false,close or p.close)
elseif connector == "--" then
return inject(p,true,close or p.close)
end
end
return flush(p,connector,close)
end
end
scanset = function() -- can be optimized, we now read twice
scantoken()
if scantoken(true) == rightbrace_code then
scantoken()
return { }
else
local l = { }
local i = 0
while true do
i = i + 1
local s = scansymbol(true)
if s == "{" then
l[i] = scanset()
elseif s == "[" then
local d = { }
scansymbol()
while true do
local s = scansymbol()
if s == "]" then
break;
elseif s == "," then
-- continue
else
local t = scantoken(true)
if t == equals_code or t == colon_code then
scantoken()
end
d[s] = tokenscanners[scantoken(true)]()
end
end
l[i] = d
else
local e = scanexpression(true)
l[i] = (typescanners[e] or scanexpression)()
end
if scantoken() == rightbrace_code then
break
else
-- whatever
end
end
return l
end
end
local function scan_pair () return scanpair (true) end
local function scan_color () return scancolor (true) end
local function scan_cmykcolor() return scancmykcolor(true) end
local function scan_transform() return scantransform(true) end
tokenscanners = {
[leftbrace_code] = scanset,
[numeric_code] = scannumeric,
[string_code] = scanstring,
[nullary_code] = scanboolean, -- todo
}
typescanners = {
[types.known] = scannumeric,
[types.numeric] = scannumeric,
[types.string] = scanstring,
[types.boolean] = scanboolean,
[types.pair] = scan_pair,
[types.color] = scan_color,
[types.cmykcolor] = scan_cmykcolor,
[types.transform] = scan_transform,
[types.path] = scanpath,
[types.pen] = scanpen,
}
table.setmetatableindex(tokenscanners,function()
local e = scanexpression(true)
return typescanners[e] or scanexpression
end)
-- a key like 'color' has code 'declare'
local function scanparameters(fenced)
local data = { }
local close = "]"
if not fenced then
close = ";"
elseif scansymbol(true) == "[" then
scansymbol()
else
return data
end
while true do
-- local s = scansymbol()
local s = scansymbol(false,false)
if s == close then
break;
elseif s == "," then
-- continue
else
local t = scantoken(true)
if t == equals_code or t == colon_code then
-- optional equal or :
scantoken()
end
local kind = scantoken(true)
if kind == leftdelimiter_code or kind == tag_code or kind == capsule_code then
kind = scanexpression(true)
data[s] = (typescanners[kind] or scanexpression)()
elseif kind == leftbracket_code then
data[s] = get_parameters(true)
else
data[s] = tokenscanners[kind]()
end
end
end
return data
end
local namespaces = { }
local presets = { }
local passed = { }
local function get_parameters(nested)
local data = { }
if nested or scansymbol(true) == "[" then
scansymbol()
else
return data
end
while true do
local s = scansymbol(false,false)
if s == "]" then
break;
elseif s == "," then
-- continue
else
local t = scantoken(true)
if t == equals_code or t == colon_code then
-- optional equal or :
scantoken()
end
local kind = scantoken(true)
if kind == leftdelimiter_code or kind == tag_code or kind == capsule_code then
kind = scanexpression(true)
data[s] = (typescanners[kind] or scanexpression)()
elseif kind == leftbracket_code then
data[s] = get_parameters(true)
else
data[s] = tokenscanners[kind]()
end
end
end
return data
end
local function getparameters()
local namespace = scanstring()
-- same as below
local parameters = get_parameters()
local presets = presets[namespace]
local passed = passed[namespace]
if passed then
if presets then
setmetatableindex(passed,presets)
end
setmetatableindex(parameters,passed)
elseif presets then
setmetatableindex(parameters,presets)
end
namespaces[namespace] = parameters
--
end
local function applyparameters()
local saved = namespaces
local namespace = scanstring()
local action = scanstring() -- before we scan the parameters
-- same as above
local parameters = get_parameters()
local presets = presets[namespace]
local passed = passed[namespace]
if passed then
if presets then
setmetatableindex(passed,presets)
end
setmetatableindex(parameters,passed)
elseif presets then
setmetatableindex(parameters,presets)
end
namespaces[namespace] = parameters
-- till here
mpprint(action)
namespaces = saved
end
local function presetparameters()
local namespace = scanstring()
local parent = nil
local t = scantoken(true)
if t == string_code then
parent = presets[scanstring()]
end
local p = get_parameters()
if parent then
setmetatableindex(p,parent)
end
presets[namespace] = p
end
local function collectnames()
local l = { } -- can be reused but then we can't nest
local n = 0
while true do
local t = scantoken(true)
-- (1) not really needed
if t == numeric_code then
n = n + 1 l[n] = scaninteger(1)
elseif t == string_code then
n = n + 1 l[n] = scanstring(1)
elseif t == nullary_code then
n = n + 1 l[n] = scanboolean(1)
elseif t == leftdelimiter_code or t == tag_code or t == capsule_code then
t = scanexpression(true)
n = n + 1 l[n] = (typescanners[t] or scanexpression)()
else
break
end
end
return l, n
end
local function get(v)
local t = type(v)
if t == "number" then
return injectnumeric(v)
elseif t == "boolean" then
return injectboolean(v)
elseif t == "string" then
return injectstring(v)
elseif t == "table" then
local n = #v
if type(v[1]) == "table" then
return injectpath(v) -- cycle ?
elseif n == 2 then
return injectpair(v)
elseif n == 3 then
return injecttriplet(v)
elseif n == 4 then
return injectquadruple(v)
elseif n == 6 then
return injecttransform(v)
end
end
return injectnumeric(0)
end
local stack = { }
local function pushparameters()
local l, n = collectnames()
insert(stack,namespaces)
for i=1,n do
local n = namespaces[l[i]]
if type(n) == "table" then
namespaces = n
else
break
end
end
end
local function popparameters()
local n = remove(stack)
if n then
namespaces = n
else
report("stack error")
end
end
-- todo:
local function getparameter()
local list, n = collectnames()
local v = namespaces
for i=1,n do
local l = list[i]
local vl = v[l]
if vl == nil then
if type(l) == "number" then
vl = v[1]
if vl == nil then
return injectnumeric(0)
end
else
return injectnumeric(0)
end
end
v = vl
end
if v == nil then
return injectnumeric(0)
else
return get(v)
end
end
local function hasparameter()
local list, n = collectnames()
local v = namespaces
for i=1,n do
local l = list[i]
local vl = rawget(v,l)
if vl == nil then
if type(l) == "number" then
vl = rawget(v,1)
if vl == nil then
return injectboolean(false)
end
else
return injectboolean(false)
end
end
v = vl
end
if v == nil then
return injectboolean(false)
else
return injectboolean(true)
end
end
local function hasoption()
local list, n = collectnames()
if n > 1 then
local v = namespaces
if n > 2 then
for i=1,n-1 do
local l = list[i]
local vl = v[l]
if vl == nil then
return injectboolean(false)
end
v = vl
end
else
v = v[list[1]]
end
if type(v) == "string" then
-- no caching .. slow anyway
local o = list[n]
if v == o then
return injectboolean(true)
end
for vv in gmatch(v,"[^%s,]+") do
for oo in gmatch(o,"[^%s,]+") do
if vv == oo then
return injectboolean(true)
end
end
end
end
end
return injectboolean(false)
end
local function getparameterdefault()
local list, n = collectnames()
local v = namespaces
if n == 1 then
local l = list[1]
local vl = v[l]
if vl == nil then
-- maybe backtrack
local top = stack[#stack]
if top then
vl = top[l]
end
end
if vl == nil then
return injectnumeric(0)
else
return get(vl)
end
else
for i=1,n-1 do
local l = list[i]
local vl = v[l]
if vl == nil then
if type(l) == "number" then
vl = v[1]
if vl == nil then
return get(list[n])
end
else
local last = list[n]
if last == "*" then
-- so, only when not pushed
local m = getmetatable(namespaces[list[1]])
if n then
m = m.__index -- can also be a _m_
end
if m then
local v = m
for i=2,n-1 do
local l = list[i]
local vl = v[l]
if vl == nil then
return injectnumeric(0)
end
v = vl
end
if v == nil then
return injectnumeric(0)
else
return get(v)
end
end
return injectnumeric(0)
else
return get(last)
end
end
end
v = vl
end
if v == nil then
return get(list[n])
else
return get(v)
end
end
end
local function getparametercount()
local list, n = collectnames()
local v = namespaces
for i=1,n do
v = v[list[i]]
if not v then
break
end
end
return injectnumeric(type(v) == "table" and #v or 0)
end
local function getmaxparametercount()
local list, n = collectnames()
local v = namespaces
for i=1,n do
v = v[list[i]]
if not v then
break
end
end
local n = 0
if type(v) == "table" then
local v1 = v[1]
if type(v1) == "table" then
n = #v1
for i=2,#v do
local vi = v[i]
if type(vi) == "table" then
local vn = #vi
if vn > n then
n = vn
end
else
break;
end
end
end
end
return injectnumeric(n)
end
local validconnectors = {
[".."] = true,
["..."] = true,
["--"] = true,
}
local function getparameterpath()
local list, n = collectnames()
local close = list[n]
if type(close) == "boolean" then
n = n - 1
else
close = false
end
local connector = list[n]
if type(connector) == "string" and validconnectors[connector] then
n = n - 1
else
connector = "--"
end
local v = namespaces
for i=1,n do
v = v[list[i]]
if not v then
break
end
end
if type(v) == "table" then
return injectpath(v,connector,close)
else
return injectpair(0,0)
end
end
local function getparameterpen()
local list, n = collectnames()
local v = namespaces
for i=1,n do
v = v[list[i]]
if not v then
break
end
end
if type(v) == "table" then
return injectpath(v,"..",true)
else
return injectpair(0,0)
end
end
local function getparametertext()
local list, n = collectnames()
local strut = list[n]
if type(strut) == "boolean" then
n = n - 1
else
strut = false
end
local v = namespaces
for i=1,n do
v = v[list[i]]
if not v then
break
end
end
if type(v) == "string" then
return injectstring("\\strut " .. v)
else
return injectstring("")
end
end
-- local function getparameteroption()
-- local list, n = collectnames()
-- local last = list[n]
-- if type(last) == "string" then
-- n = n - 1
-- else
-- return false
-- end
-- local v = namespaces
-- for i=1,n do
-- v = v[list[i]]
-- if not v then
-- break
-- end
-- end
-- if type(v) == "string" and v ~= "" then
-- for s in gmatch(v,"[^ ,]+") do
-- if s == last then
-- return true
-- end
-- end
-- end
-- return false
-- end
function metapost.scanparameters()
-- scantoken() -- we scan the semicolon
return get_parameters()
end
metapost.registerscript("getparameters", getparameters)
metapost.registerscript("applyparameters", applyparameters)
metapost.registerscript("presetparameters", presetparameters)
metapost.registerscript("hasparameter", hasparameter)
metapost.registerscript("hasoption", hasoption)
metapost.registerscript("getparameter", getparameter)
metapost.registerscript("getparameterdefault", getparameterdefault)
metapost.registerscript("getparametercount", getparametercount)
metapost.registerscript("getmaxparametercount",getmaxparametercount)
metapost.registerscript("getparameterpath", getparameterpath)
metapost.registerscript("getparameterpen", getparameterpen)
metapost.registerscript("getparametertext", getparametertext)
--------.registerscript("getparameteroption", getparameteroption)
metapost.registerscript("pushparameters", pushparameters)
metapost.registerscript("popparameters", popparameters)
function metapost.getparameter(list)
local n = #list
local v = namespaces
for i=1,n do
local l = list[i]
local vl = v[l]
if vl == nil then
return
end
v = vl
end
return v
end
function metapost.getparameterset(namespace)
return namespace and namespaces[namespace] or namespaces
end
function metapost.setparameterset(namespace,t)
namespaces[namespace] = t
end
-- goodies
metapost.registerscript("definecolor", function()
scantoken() -- we scan the semicolon
local s = get_parameters()
attributes.colors.defineprocesscolordirect(s)
end)
-- tex scanners
local scanners = tokens.scanners
local scanhash = scanners.hash
local scanstring = scanners.string
local scanvalue = scanners.value
local scaninteger = scanners.integer
local scanboolean = scanners.boolean
local scanfloat = scanners.float
local scandimension = scanners.dimension
local definitions = { }
local bpfactor = number.dimenfactors.bp
local comma = byte(",")
local close = byte("]")
local scanrest = function() return scanvalue(comma,close) or "" end
local scandimension = function() return scandimension() * bpfactor end
local scanners = {
["integer"] = scaninteger,
["number"] = scanfloat,
["numeric"] = scanfloat,
["boolean"] = scanboolean,
["string"] = scanrest,
["dimension"] = scandimension,
}
interfaces.implement {
name = "lmt_parameters_define",
arguments = "string",
actions = function(namespace)
local d = scanhash()
for k, v in next, d do
d[k] = scanners[v] or scanrest
end
definitions[namespace] = d
end,
}
interfaces.implement {
name = "lmt_parameters_preset",
arguments = "string",
actions = function(namespace)
passed[namespace] = scanhash(definitions[namespace])
end,
}
interfaces.implement {
name = "lmt_parameters_reset",
arguments = "string",
actions = function(namespace)
passed[namespace] = nil
end,
}
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