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-- filename : luat-lmx.lua
-- comment : companion to luat-lmx.tex
-- author : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license : see context related readme files
if not versions then versions = { } end versions['luat-mlx'] = 1.001
-- we can now use l-xml, and we can also use lpeg
lmx = { }
lmx.escapes = {
['&'] = '&',
['<'] = '<',
['>'] = '>',
['"'] = '"'
}
-- local function p -> ends up in lmx.p, so we need to cast
lmx.variables = { }
lmx.variables['title-default'] = 'LMX File'
lmx.variables['title'] = lmx.variables['title-default']
-- demonstrates: local, *all, gsub using tables, nil or value, loadstring
function lmx.loadedfile(filename)
return input.texdatablob(texmf.instance, filename)
end
lmx.converting = false
function lmx.convert(template,result) -- todo: use lpeg instead
if not lmx.converting then -- else, if error then again tex error and loop
local data = input.texdatablob(texmf.instance, template)
local f = false
if result then
f = io.open(result,"w")
function lmx.print(str) f:write(str) end
else
lmx.print = io.write
end
function lmx.variable(str)
return lmx.variables[str] or ""
end
function lmx.escape(str)
return string.gsub(str:gsub('&','&'),'[<>"]',lmx.escapes)
end
function lmx.type(str)
if str then lmx.print("<tt>" .. lmx.escape(str) .. "</tt>") end
end
function lmx.pv(str)
lmx.print(lmx.variable(str))
end
function lmx.tv(str)
lmx.type(lmx.variable(str))
end
data = data:gsub("<%?lmx%-include%s+(.-)%s-%?>", function(filename)
return lmx.loadedfile(filename)
end)
local definitions = { }
data = data:gsub("<%?lmx%-define%-begin%s+(%S-)%s-%?>(.-)<%?lmx%-define%-end%s-%?>", function(tag,content)
definitions[tag] = content
return ""
end)
data = data:gsub("<%?lmx%-resolve%s+(%S-)%s-%?>", function(tag)
return definitions[tag] or ""
end)
data = data:gsub("%c%s-(<%?lua .-%?>)%s-%c", function(lua)
return "\n" .. lua .. " "
end)
data = string.gsub(data .. "<?lua ?>","(.-)<%?lua%s+(.-)%?>", function(txt, lua)
txt = txt:gsub("%c+", "\\n")
txt = txt:gsub('"' , '\\"')
txt = txt:gsub("'" , "\\'")
-- txt = string.gsub(txt, "([\'\"])", { ["'"] = '\\"', ['"'] = "\\'" } )
return "p(\"" .. txt .. "\")\n" .. lua .. "\n"
end)
lmx.converting = true
data = "local p,v,e,t,pv,tv = lmx.print,lmx.variable,lmx.escape,lmx.type,lmx.pv,lmx.tv " .. data
assert(loadstring(data))()
lmx.converting = false
if f then
f:close()
end
end
end
-- these can be overloaded; we assume that the os handles filename associations
lmx.lmxfile = function(filename) return filename end
lmx.htmfile = function(filename) return filename end
if environment.platform == "windows" then
lmx.popupfile = function(filename) os.execute("start " .. filename) end
else
lmx.popupfile = function(filename) os.execute(filename) end
end
function lmx.show(name)
local lmxfile = lmx.lmxfile(name)
local htmfile = lmx.htmfile(name)
if lmxfile == htmfile then
htmfile = string.gsub(lmxfile, "%.%a+$", "html")
end
lmx.convert(lmxfile, htmfile)
lmx.popupfile(htmfile)
end
-- kind of private
lmx.restorables = { }
function lmx.set(key, value)
if not lmx.restorables[key] then
table.insert(lmx.restorables, key)
lmx.variables['@@' .. key] = lmx.variables[key]
end
lmx.variables[key] = value
end
function lmx.get(key)
return lmx.variables[key] or ""
end
function lmx.restore()
for _,key in pairs(lmx.restorables) do
lmx.variables[key] = lmx.variables['@@' .. key]
end
lmx.restorables = { }
end
-- command line
if arg then
if arg[1] == "--show" then if arg[2] then lmx.show (arg[2]) end
elseif arg[1] == "--convert" then if arg[2] then lmx.convert(arg[2], arg[3] or "temp.html") end
end
end
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