1 files changed, 119 insertions, 0 deletions
diff --git a/tex/context/base/mkiv/buff-imp-mp.lua b/tex/context/base/mkiv/buff-imp-mp.lua
new file mode 100644
index 000000000..bcd18dd47
--- /dev/null
+++ b/tex/context/base/mkiv/buff-imp-mp.lua
@@ -0,0 +1,119 @@
+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 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,
+    string       = function(s) MetapostSnippetString(s) end,
+    quote        = function(s) MetapostSnippetQuote(s) end,
+    name         = visualizename,
+}
+
+local comment     = S("%")
+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)
+                * (V("space") + V("content"))^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 } )