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if not modules then modules = { } end modules ['buff-imp-mp'] = {
version = 1.001,
comment = "companion to buff-imp-mp.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- Now that we also use lpeg lexers in scite, we can share the keywords
-- so we have moved the keyword lists to mult-mps.lua. Don't confuse the
-- scite lexers with the ones we use here. Of course all those lexers
-- boil down to doing similar things, but here we need more control over
-- the rendering and have a different way of nesting. It is no coincidence
-- that the coloring looks similar: both are derived from earlier lexing (in
-- texedit, mkii and the c++ scite lexer).
--
-- In the meantime we have lpeg based lexers in scite! And, as all this
-- lexing boils down to the same principles (associating symbolic rendering
-- with ranges of characters) and as the scite lexers do nesting, it makes
-- sense at some point to share code. However, keep in mind that the pretty
-- printers are also supposed to support invalid code (for educational
-- purposes). The scite lexers are more recent and there a different color
-- scheme is used. So, we might move away from the traditional coloring.
local P, S, V, patterns = lpeg.P, lpeg.S, lpeg.V, lpeg.patterns
local context = context
local verbatim = context.verbatim
local makepattern = visualizers.makepattern
local MetapostSnippet = context.MetapostSnippet
local startMetapostSnippet = context.startMetapostSnippet
local stopMetapostSnippet = context.stopMetapostSnippet
local MetapostSnippetConstructor = verbatim.MetapostSnippetConstructor
local MetapostSnippetBoundary = verbatim.MetapostSnippetBoundary
local MetapostSnippetSpecial = verbatim.MetapostSnippetSpecial
local MetapostSnippetComment = verbatim.MetapostSnippetComment
local MetapostSnippetCommentText = verbatim.MetapostSnippetCommentText
local MetapostSnippetQuote = verbatim.MetapostSnippetQuote
local MetapostSnippetString = verbatim.MetapostSnippetString
local MetapostSnippetNamePrimitive = verbatim.MetapostSnippetNamePrimitive
local MetapostSnippetNamePlain = verbatim.MetapostSnippetNamePlain
local MetapostSnippetNameMetafun = verbatim.MetapostSnippetNameMetafun
local MetapostSnippetName = verbatim.MetapostSnippetName
local primitives, plain, metafun
local function initialize()
local mps = dofile(resolvers.findfile("mult-mps.lua","tex")) or {
primitives = { },
plain = { },
metafun = { },
}
primitives = table.tohash(mps.primitives)
plain = table.tohash(mps.plain)
metafun = table.tohash(mps.metafun)
end
local function visualizename(s)
if not primitives then
initialize()
end
if primitives[s] then
MetapostSnippetNamePrimitive(s)
elseif plain[s] then
MetapostSnippetNamePlain(s)
elseif metafun[s] then
MetapostSnippetNameMetafun(s)
else
MetapostSnippetName(s)
end
end
local handler = visualizers.newhandler {
startinline = function() MetapostSnippet(false,"{") end,
stopinline = function() context("}") end,
startdisplay = function() startMetapostSnippet() end,
stopdisplay = function() stopMetapostSnippet() end ,
constructor = function(s) MetapostSnippetConstructor(s) end,
boundary = function(s) MetapostSnippetBoundary(s) end,
special = function(s) MetapostSnippetSpecial(s) end,
comment = function(s) MetapostSnippetComment(s) end,
commenttext = function(s) MetapostSnippetCommentText(s) end,
string = function(s) MetapostSnippetString(s) end,
quote = function(s) MetapostSnippetQuote(s) end,
name = visualizename,
}
local comment = P("%")
local name = (patterns.letter + S("_"))^1
local constructor = S("$@#")
local boundary = S('()[]:=<>;"')
local special = S("-+/*|`!?^&%.,")
local grammar = visualizers.newgrammar("default", { "visualizer",
comment = makepattern(handler,"comment",comment)
* makepattern(handler,"commenttext",(patterns.anything - patterns.newline)^0),
dstring = makepattern(handler,"quote",patterns.dquote)
* makepattern(handler,"string",patterns.nodquote)
* makepattern(handler,"quote",patterns.dquote),
name = makepattern(handler,"name",name),
constructor = makepattern(handler,"constructor",constructor),
boundary = makepattern(handler,"boundary",boundary),
special = makepattern(handler,"special",special),
pattern =
V("comment") + V("dstring") + V("name") + V("constructor") + V("boundary") + V("special")
+ V("newline") * V("emptyline")^0 * V("beginline")
+ V("space")
+ V("default"),
visualizer =
V("pattern")^1
} )
local parser = P(grammar)
visualizers.register("mp", { parser = parser, handler = handler, grammar = grammar } )
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