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if not modules then modules = { } end modules ['math-ali'] = {
version = 1.001,
comment = "companion to math-ali.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local unpack = unpack
local gsub = string.gsub
local lpegmatch = lpeg.match
local settings_to_array = utilities.parsers.settings_to_array
local rows = utilities.parsers.groupedsplitat(";")
local cols = utilities.parsers.groupedsplitat(",")
local context = context
local actions = {
transpose = function(m)
local t = { }
for j=1,#m[1] do
local r = { }
for i=1,#m do
r[i] = m[i][j]
end
t[j] = r
end
return t
end,
negate = function(m)
for i=1,#m do
local mi = m[i]
for j=1,#mi do
mi[j] = - mi[j]
end
end
return m
end,
scale = function(m,s)
s = tonumber(s)
if s then
for i=1,#m do
local mi = m[i]
for j=1,#mi do
mi[j] = s*mi[j]
end
end
end
return m
end,
}
local useractions = {
}
interfaces.implement {
name = "simplematrix",
arguments = "2 strings",
actions = function(method,data)
local m = lpegmatch(rows,(gsub(data,"%s+"," ")))
for i=1,#m do
m[i] = lpegmatch(cols,m[i])
end
local methods = settings_to_array(method)
for i=1,#methods do
local detail = settings_to_array(methods[i])
local method = detail[1]
local action = actions[method] or useractions[method]
if action then
m = action(m,unpack(detail,2)) or m
end
end
for i=1,#m do
context("\\NC %{ \\NC }t \\NR",m[i])
end
end
}
function mathematics.registersimplematrix(name,action)
if type(action) == "function" then
useractions[name] = action
end
end
-- \cases{1, x>0 ; -1, x<0 }
interfaces.implement {
name = "simplecases",
arguments = "2 strings",
actions = function(method,data)
-- no methods yet
local m = lpegmatch(rows,(gsub(data,"%s+"," ")))
for i=1,#m do
m[i] = lpegmatch(cols,m[i])
end
for i=1,#m do
context("\\NC %{ \\NC }t \\NR",m[i])
end
end
}
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