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if not modules then modules = { } end modules ['buff-ini'] = {
version = 1.001,
comment = "companion to buff-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local trace_run = false trackers.register("buffers.run", function(v) trace_run = v end)
local trace_grab = false trackers.register("buffers.grab", function(v) trace_grab = v end)
local trace_visualize = false trackers.register("buffers.visualize", function(v) trace_visualize = v end)
local report_buffers = logs.reporter("buffers","usage")
local report_grabbing = logs.reporter("buffers","grabbing")
local context, commands = context, commands
local concat = table.concat
local type, next, load = type, next, load
local sub, format = string.sub, string.format
local splitlines, validstring = string.splitlines, string.valid
local P, Cs, patterns, lpegmatch = lpeg.P, lpeg.Cs, lpeg.patterns, lpeg.match
local variables = interfaces.variables
local settings_to_array = utilities.parsers.settings_to_array
local formatters = string.formatters
local v_yes = variables.yes
local catcodenumbers = catcodes.numbers
local ctxcatcodes = catcodenumbers.ctxcatcodes
local txtcatcodes = catcodenumbers.txtcatcodes
buffers = buffers or { }
local buffers = buffers
local cache = { }
local function erase(name)
cache[name] = nil
end
local function assign(name,str,catcodes)
cache[name] = { data = str, catcodes = catcodes }
end
local function append(name,str)
local buffer = cache[name]
if buffer then
buffer.data = buffer.data .. str
else
cache[name] = { data = str }
end
end
local function exists(name)
return cache[name]
end
local function getcontent(name)
local buffer = name and cache[name]
return buffer and buffer.data or ""
end
local function getlines(name)
local buffer = name and cache[name]
return buffer and splitlines(buffer.data)
end
local function collectcontent(names,separator) -- no print
if type(names) == "string" then
names = settings_to_array(names)
end
local nnames = #names
if nnames == 0 then
return getcontent("") -- default buffer
elseif nnames == 1 then
return getcontent(names[1])
else
local t, n = { }, 0
for i=1,nnames do
local c = getcontent(names[i])
if c ~= "" then
n = n + 1
t[n] = c
end
end
return concat(t,separator or "\n") -- was \r
end
end
local function loadcontent(names) -- no print
if type(names) == "string" then
names = settings_to_array(names)
end
local nnames = #names
local ok = false
if nnames == 0 then
ok = load(getcontent("")) -- default buffer
elseif nnames == 1 then
ok = load(getcontent(names[1]))
else
-- lua 5.2 chunked load
local i = 0
ok = load(function()
while true do
i = i + 1
if i > nnames then
return nil
end
local c = getcontent(names[i])
if c == "" then
-- would trigger end of load
else
return c
end
end
end)
end
if ok then
return ok()
elseif nnames == 0 then
report_buffers("invalid lua code in default buffer")
else
report_buffers("invalid lua code in buffer %a",concat(names,","))
end
end
buffers.raw = getcontent
buffers.erase = erase
buffers.assign = assign
buffers.append = append
buffers.exists = exists
buffers.getcontent = getcontent
buffers.getlines = getlines
buffers.collectcontent = collectcontent
buffers.loadcontent = loadcontent
-- the context interface
commands.erasebuffer = erase
commands.assignbuffer = assign
local anything = patterns.anything
local alwaysmatched = patterns.alwaysmatched
local function countnesting(b,e)
local n
local g = P(b) / function() n = n + 1 end
+ P(e) / function() n = n - 1 end
+ anything
local p = alwaysmatched / function() n = 0 end
* g^0
* alwaysmatched / function() return n end
return p
end
local counters = { }
local nesting = 0
local autoundent = true
local continue = false
-- Beware: the first character of bufferdata has to be discarded as it's there to
-- prevent gobbling of newlines in the case of nested buffers. The last one is
-- a newlinechar and is removed too.
--
-- An \n is unlikely to show up as \r is the endlinechar but \n is more generic
-- for us.
-- This fits the way we fetch verbatim: the indentatio before the sentinel
-- determines the stripping.
-- str = [[
-- test test test test test test test
-- test test test test test test test
-- test test test test test test test
--
-- test test test test test test test
-- test test test test test test test
-- test test test test test test test
-- ]]
-- local function undent(str)
-- local margin = match(str,"[\n\r]( +)[\n\r]*$") or ""
-- local indent = #margin
-- if indent > 0 then
-- local lines = splitlines(str)
-- local ok = true
-- local pattern = "^" .. margin
-- for i=1,#lines do
-- local l = lines[i]
-- if find(l,pattern) then
-- lines[i] = sub(l,indent+1)
-- else
-- ok = false
-- break
-- end
-- end
-- if ok then
-- return concat(lines,"\n")
-- end
-- end
-- return str
-- end
-- how about tabs
local getmargin = (Cs(P(" ")^1)*P(-1)+1)^1
local eol = patterns.eol
local whatever = (P(1)-eol)^0 * eol^1
local strippers = { }
local function undent(str) -- new version, needs testing
local margin = lpegmatch(getmargin,str)
if type(margin) ~= "string" then
return str
end
local indent = #margin
if indent == 0 then
return str
end
local stripper = strippers[indent]
if not stripper then
stripper = Cs((P(margin)/"" * whatever + eol^1)^1)
strippers[indent] = stripper
end
return lpegmatch(stripper,str) or str
end
function commands.grabbuffer(name,begintag,endtag,bufferdata,catcodes) -- maybe move \\ to call
local dn = getcontent(name)
if dn == "" then
nesting = 0
continue = false
end
if trace_grab then
if #bufferdata > 30 then
report_grabbing("%s => |%s..%s|",name,sub(bufferdata,1,10),sub(bufferdata,-10,#bufferdata))
else
report_grabbing("%s => |%s|",name,bufferdata)
end
end
local counter = counters[begintag]
if not counter then
counter = countnesting(begintag,endtag)
counters[begintag] = counter
end
nesting = nesting + lpegmatch(counter,bufferdata)
local more = nesting > 0
if more then
dn = dn .. sub(bufferdata,2,-1) .. endtag
nesting = nesting - 1
continue = true
else
if continue then
dn = dn .. sub(bufferdata,2,-2) -- no \r, \n is more generic
elseif dn == "" then
dn = sub(bufferdata,2,-2)
else
dn = dn .. "\n" .. sub(bufferdata,2,-2) -- no \r, \n is more generic
end
local last = sub(dn,-1)
if last == "\n" or last == "\r" then -- \n is unlikely as \r is the endlinechar
dn = sub(dn,1,-2)
end
if autoundent then
dn = undent(dn)
end
end
assign(name,dn,catcodes)
commands.doifelse(more)
end
-- The optional prefix hack is there for the typesetbuffer feature and
-- in mkii we needed that (this hidden feature is used in a manual).
local function prepared(name,list,prefix) -- list is optional
if not list or list == "" then
list = name
end
if not name or name == "" then
name = list
end
local content = collectcontent(list,nil) or ""
if content == "" then
content = "empty buffer"
end
if prefix then
local name = file.addsuffix(name,"tmp")
return tex.jobname .. "-" .. name, content
else
return name, content
end
end
local capsule = "\\starttext\n%s\n\\stoptext\n"
local command = "context %s"
function commands.runbuffer(name,list,encapsulate)
local name, content = prepared(name,list)
if encapsulate then
content = format(capsule,content)
end
local data = io.loaddata(name)
if data ~= content then
if trace_run then
report_buffers("changes in %a, processing forced",name)
end
io.savedata(name,content)
os.execute(format(command,name))
elseif trace_run then
report_buffers("no changes in %a, not processed",name)
end
end
function commands.savebuffer(list,name,prefix) -- name is optional
local name, content = prepared(name,list,prefix==v_yes)
io.savedata(name,content)
end
function commands.getbuffer(name)
local str = getcontent(name)
if str ~= "" then
context.viafile(str,formatters["buffer.%s"](validstring(name,"noname")))
end
end
function commands.getbuffermkvi(name) -- rather direct !
context.viafile(resolvers.macros.preprocessed(getcontent(name)),formatters["buffer.%s.mkiv"](validstring(name,"noname")))
end
function commands.gettexbuffer(name)
local buffer = name and cache[name]
if buffer and buffer.data ~= "" then
context.pushcatcodetable()
if buffer.catcodes == txtcatcodes then
context.setcatcodetable(txtcatcodes)
else
context.setcatcodetable(ctxcatcodes)
end
-- context(function() context.viafile(buffer.data) end)
context.getbuffer { name } -- viafile flushes too soon
context.popcatcodetable()
end
end
commands.getbufferctxlua = loadcontent
function commands.doifelsebuffer(name)
commands.doifelse(exists(name))
end
-- This only used for mp buffers and is a kludge. Don't change the
-- texprint into texsprint as it fails because "p<nl>enddef" becomes
-- "penddef" then.
-- function commands.feedback(names)
-- texprint(ctxcatcodes,splitlines(collectcontent(names)))
-- end
function commands.feedback(names) -- bad name, maybe rename to injectbuffercontent
context.printlines(collectcontent(names))
end
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