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if not modules then modules = { } end modules ['meta-nod'] = {
version = 1.001,
comment = "companion to meta-nod.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local tonumber = tonumber
local P, R, Cs, lpegmatch = lpeg.P, lpeg.R, lpeg.Cs, lpeg.match
local references = { }
local trace = false
local report = logs.reporter("metapost","nodes")
local context = context
local implement = interfaces.implement
trackers.register("metapost.nodes", function(v) trace = v end)
local word = R("AZ","az","__")^1
local pattern = Cs (
(
word / function(s) return references[s] or s end
+ P("{") / "["
+ P("}") / "]"
+ P(1)
)^1
)
implement {
name = "grph_nodes_initialize",
actions = function()
references = { }
end
}
implement {
name = "grph_nodes_reset",
actions = function()
references = { }
end
}
implement {
name = "grph_nodes_register",
arguments = { "string", "integer" },
actions = function(s,r)
if not tonumber(s) then
if trace then
report("register %i as %a",t,s)
end
references[s] = r
end
end
}
implement {
name = "grph_nodes_resolve",
arguments = "string",
actions = function(s)
local r = references[s]
if r then
if trace then
report("resolve %a to %i",s,r)
end
context(r)
return
end
local n = lpegmatch(pattern,s)
if s ~= n then
if trace then
report("resolve '%s' to %s",s,n)
end
context(n)
return
end
context(s)
end
}
|
