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if not modules then modules = { } end modules ['syst-mac'] = {
version = 1.001,
comment = "companion to syst-aux.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- This is kind of tricky and might not work for all csnames but as long as we use
-- it in a controlled way, we're okay. The engine implementation might be changed
-- a bit (no need to go through strings, but fetching a cs index and passing that
-- back also takes time).
-- Another approach is to have the predefined stack operate use private stacks and
-- then the pop doesn't need the cs. But ... we then also need to store stuff in
-- the format so that complicates maters more than I'm willing to do.
local insert, remove = table.insert, table.remove
local push_macro = token.push_macro
local pop_macro = token.pop_macro
local scan_csname = token.scan_csname
local create_token = token.create
local gobble_token = token.gobble
local context = context
local implement = interfaces.implement
local report = logs.reporter("system","macrostack")
local stack = table.setmetatableindex("table")
local function pushmacro(name,global)
local s = push_macro(name,global)
if s then
insert(stack[name],s)
else
report("no macro %a",name)
insert(stack[name],false)
end
end
local function popmacro(name)
local s = remove(stack[name])
if s then
pop_macro(s)
else
-- error
end
end
tokens.pushmacro = pushmacro
tokens.popmacro = popmacro
implement {
name = "localpushmacro",
public = true,
protected = true,
actions = function()
pushmacro(scan_csname())
end
}
implement {
name = "globalpushmacro",
public = true,
protected = true,
actions = function()
pushmacro(scan_csname(),true)
end
}
implement {
name = "localpopmacro",
public = true,
protected = true,
actions = function()
popmacro(scan_csname())
end
}
implement {
name = "globalpopmacro",
public = true,
protected = true,
actions = function()
popmacro(scan_csname())
end
}
implement {
name = "showmacrostack",
public = true,
protected = true,
actions = function()
local n = scan_csname()
local s = stack[n]
local m = #s
report("%s : %i stack slots used",n,m)
for i=1,m do
report("% 3i %S",i,s[i])
end
end
}
implement {
name = "gobblenested",
public = true,
protected = true,
arguments = "3 strings",
actions = function(start,stop,command)
gobble_token(create_token(start),create_token(stop))
if command then
context[command]()
end
end
}
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