1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
if not modules then modules = { } end modules ['buff-imp-nested'] = {
version = 1.001,
comment = "companion to buff-imp-nested.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local lpegmatch, patterns = lpeg.match, lpeg.patterns
local P, V, Carg = lpeg.P, lpeg.V, lpeg.Carg
local context = context
local verbatim = context.verbatim
local variables = interfaces.variables
local makepattern = visualizers.makepattern
local getvisualizer = visualizers.getvisualizer
local nested = nil
local donestedtypingstart = context.donestedtypingstart
local donestedtypingstop = context.donestedtypingstop
local v_none = variables.none
local v_slanted = variables.slanted
local handler = visualizers.newhandler {
initialize = function(settings)
local option = settings and settings.option
if not option or option == "" then
nested = nil
elseif option == v_slanted then
nested = nil
elseif option == v_none then
nested = nil
else
nested = getvisualizer(option,"direct")
end
end,
open = function()
donestedtypingstart()
end,
close = function()
donestedtypingstop()
end,
content = function(s)
if nested then
nested(s)
else
verbatim(s)
end
end,
}
local open = P("<<")
local close = P(">>")
local rest = (1 - open - close - patterns.space - patterns.newline)^1
local grammar = visualizers.newgrammar("default", {
initialize = patterns.beginofstring * Carg(1) / handler.initialize,
open = makepattern(handler,"open",open),
close = makepattern(handler,"close",close),
rest = makepattern(handler,"content",rest),
nested = V("open") * (V("pattern")^0) * V("close"),
pattern = V("line") + V("space") + V("nested") + V("rest"),
visualizer = V("initialize") * (V("pattern")^1)
} )
local parser = P(grammar)
visualizers.register("nested", { parser = parser, handler = handler, grammar = grammar } )
-- lpeg.match(parser,[[<<tf<<sl>>tf<<sl>>tf>>]]) context.par()
-- lpeg.match(parser,[[<<tf<<sl<<tf>>sl>>tf>>]]) context.par()
-- lpeg.match(parser,[[sl<<tf<<sl>>tf>>sl]]) context.par()
|
