1 files changed, 42 insertions, 0 deletions
diff --git a/tex/context/base/mkiv/buff-imp-default.lua b/tex/context/base/mkiv/buff-imp-default.lua
new file mode 100644
index 000000000..79f01c47d
--- /dev/null
+++ b/tex/context/base/mkiv/buff-imp-default.lua
@@ -0,0 +1,42 @@
+if not modules then modules = { } end modules ['buff-imp-default'] = {
+    version   = 1.001,
+    comment   = "companion to buff-imp-default.mkiv",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+local patterns, P, V = lpeg.patterns, lpeg.P, lpeg.V
+local makepattern = visualizers.makepattern
+
+local handler = visualizers.newhandler()
+
+local grammar = { "visualizer",
+
+    -- basic
+
+    signal     = makepattern(handler,"signal",   visualizers.signalpattern),
+    emptyline  = makepattern(handler,"emptyline",patterns.emptyline),
+    beginline  = makepattern(handler,"beginline",patterns.beginline),
+    newline    = makepattern(handler,"newline",  patterns.newline),
+    space      = makepattern(handler,"space",    patterns.space),
+    default    = makepattern(handler,"default",  patterns.utf8character),
+    content    = makepattern(handler,"default",  patterns.somecontent), -- not too efficient
+
+    -- handy
+
+ -- line               = V("newline") * V("emptyline")^0 * V("beginline"),
+    line               = V("newline") * V("emptyline")^0 * V("beginline") + V("emptyline") + V("newline"),
+    whitespace         = (V("space") + V("line"))^1,
+    optionalwhitespace = (V("space") + V("line"))^0,
+
+    -- used
+
+    pattern            = V("line") + V("space") + V("signal") + V("content"),
+    visualizer         = V("pattern")^1
+
+}
+
+local parser = P(grammar)
+
+visualizers.register("default", { parser = parser, handler = handler, grammar = grammar })