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if not modules then modules = { } end modules ['pret-tex'] = {
version = 1.001,
comment = "companion to buff-ver.tex",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local utf = unicode.utf8
local utfcharacters, utfvalues = string.utfcharacters, string.utfvalues
local utfbyte, utffind = utf.byte, utf.find
local rep = string.rep
local texsprint, texwrite = tex.sprint, tex.write
local ctxcatcodes, vrbcatcodes = tex.ctxcatcodes, tex.vrbcatcodes
local visualizer = buffers.newvisualizer("tex")
local colors = {
"prettytwo",
"prettyone",
"prettythree",
"prettyfour"
}
local states = {
['$']=2, ['{']=2, ['}']=2,
['[']=3, [']']=3, ['(']=3, [')']=3, ['<']=3, ['>']=3, ['#']=3, ['=']=3, ['"']=3,
['/']=4, ['^']=4, ['_']=4, ['-']=4, ['&']=4, ['+']=4, ["'"]=4, ['`']=4, ['|']=4, ['%']=4
}
-- some day I'll make an lpeg
local change_state, finish_state = buffers.change_state, buffers.finish_state
local chardata = characters.data
local is_letter = characters.is_letter
function visualizer.flush_line(str,nested)
local state, first = 0, false
buffers.currentcolors = colors
for c in utfcharacters(str) do
if c == " " then
state = finish_state(state)
texsprint(ctxcatcodes,"\\obs")
first = false
elseif c == "\t" then
state = finish_state(state)
texsprint(ctxcatcodes,"\\obs")
if buffers.visualizers.enabletab then
texsprint(ctxcatcodes,rep("\\obs ",i%buffers.visualizers.tablength))
end
first = false
elseif first then
state = 1
texwrite(c)
if not utffind(c,"^[%a%!%?%@]$") then
state = finish_state(state)
end
first = false
elseif state == 1 then
if utffind(c,"^[%a%!%?%@]$") then
texwrite(c)
first = false
elseif c == "\\" then
state = change_state(1, state)
texwrite(c)
first = true
else
state = change_state(states[c], state)
texwrite(c)
first = false
end
elseif c == "\\" then
first = true
state = change_state(1, state)
texwrite(c)
else
state = change_state(states[c], state)
texwrite(c)
first = false
end
end
state = finish_state(state)
end
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