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if not modules then modules = { } end modules ['strc-tag'] = {
version = 1.001,
comment = "companion to strc-tag.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- This is rather experimental code.
local insert, remove, unpack, concat = table.insert, table.remove, table.unpack, table.concat
local gsub, find, topattern, format = string.gsub, string.find, string.topattern, string.format
local lpegmatch = lpeg.match
local texattribute, texsprint, ctxcatcodes = tex.attribute, tex.sprint, tex.ctxcatcodes
local allocate = utilities.storage.allocate
local trace_tags = false trackers.register("structures.tags", function(v) trace_tags = v end)
local report_tags = logs.new("tags")
local attributes, structures = attributes, structures
local a_tagged = attributes.private('tagged')
local unsetvalue = attributes.unsetvalue
local codeinjections = backends.codeinjections
local taglist = allocate()
local properties = allocate()
local labels = allocate()
local stack = { }
local chain = { }
local ids = { }
local enabled = false
local tags = structures.tags
tags.taglist = taglist -- can best be hidden
tags.labels = labels
local properties = allocate {
document = { pdf = "Div", nature = "display" },
division = { pdf = "Div", nature = "display" },
paragraph = { pdf = "P", nature = "mixed" },
construct = { pdf = "Span", nature = "inline" },
section = { pdf = "Sect", nature = "display" },
sectiontitle = { pdf = "H", nature = "mixed" },
sectionnumber = { pdf = "H", nature = "mixed" },
sectioncontent = { pdf = "Div", nature = "display" },
itemgroup = { pdf = "L", nature = "display" },
item = { pdf = "Li", nature = "display" },
itemtag = { pdf = "Lbl", nature = "mixed" },
itemcontent = { pdf = "LBody", nature = "mixed" },
description = { pdf = "Li", nature = "display" },
descriptiontag = { pdf = "Lbl", nature = "mixed" },
descriptioncontent = { pdf = "LBody", nature = "mixed" },
descriptionsymbol = { pdf = "Span", nature = "inline" }, -- note reference
verbatimblock = { pdf = "Code", nature = "display" },
verbatimline = { pdf = "Code", nature = "display" },
verbatim = { pdf = "Code", nature = "inline" },
register = { pdf = "Div", nature = "display" },
registersection = { pdf = "Div", nature = "display" },
registertag = { pdf = "Span", nature = "mixed" },
registerentries = { pdf = "Div", nature = "display" },
registerentry = { pdf = "Span", nature = "mixed" },
registersee = { pdf = "Span", nature = "mixed" },
registerpages = { pdf = "Span", nature = "mixed" },
registerpage = { pdf = "Span", nature = "inline" },
table = { pdf = "Table", nature = "display" },
tablerow = { pdf = "TR", nature = "display" },
tablecell = { pdf = "TD", nature = "mixed" },
tabulate = { pdf = "Table", nature = "display" },
tabulaterow = { pdf = "TR", nature = "display" },
tabulatecell = { pdf = "TD", nature = "mixed" },
list = { pdf = "TOC", nature = "display" },
listitem = { pdf = "TOCI", nature = "display" },
listtag = { pdf = "Lbl", nature = "mixed" },
listcontent = { pdf = "P", nature = "mixed" },
listdata = { pdf = "P", nature = "mixed" },
listpage = { pdf = "Reference", nature = "mixed" },
delimitedblock = { pdf = "BlockQuote", nature = "display" },
delimited = { pdf = "Quote", nature = "inline" },
subsentence = { pdf = "Span", nature = "inline" },
float = { pdf = "Div", nature = "display" },
floatcaption = { pdf = "Caption", nature = "display" },
floattag = { pdf = "Span", nature = "mixed" },
floattext = { pdf = "Span", nature = "mixed" },
floatcontent = { pdf = "P", nature = "mixed" },
image = { pdf = "P", nature = "mixed" },
mpgraphic = { pdf = "P", nature = "mixed" },
formulaset = { pdf = "Div", nature = "display" },
formula = { pdf = "Div", nature = "display" },
formulatag = { pdf = "Span", nature = "mixed" },
formulacontent = { pdf = "P", nature = "display" },
subformula = { pdf = "Div", nature = "display" },
link = { pdf = "Link", nature = "inline" },
margintextblock = { pdf = "Span", nature = "inline" },
margintext = { pdf = "Span", nature = "inline" },
math = { pdf = "Div", nature = "display" },
mn = { pdf = "Span", nature = "mixed" },
mi = { pdf = "Span", nature = "mixed" },
mo = { pdf = "Span", nature = "mixed" },
ms = { pdf = "Span", nature = "mixed" },
mrow = { pdf = "Span", nature = "display" },
msubsup = { pdf = "Span", nature = "display" },
msub = { pdf = "Span", nature = "display" },
msup = { pdf = "Span", nature = "display" },
merror = { pdf = "Span", nature = "mixed" },
munderover = { pdf = "Span", nature = "display" },
munder = { pdf = "Span", nature = "display" },
mover = { pdf = "Span", nature = "display" },
mtext = { pdf = "Span", nature = "mixed" },
mfrac = { pdf = "Span", nature = "display" },
mroot = { pdf = "Span", nature = "display" },
msqrt = { pdf = "Span", nature = "display" },
}
tags.properties = properties
function tags.settagproperty(tag,key,value)
local p = properties[tag]
if p then
p[key] = value
else
properties[tag] = { [key] = value }
end
end
local lasttags = { }
function tags.start(tag,label,detail)
if not enabled then
codeinjections.enabletags()
enabled = true
end
labels[tag] = label ~= "" and label or tag
local fulltag
if detail and detail ~= "" then
fulltag = tag .. ":" .. detail
else
fulltag = tag
end
local t = #taglist + 1
local n = (ids[fulltag] or 0) + 1
ids[fulltag] = n
lasttags[tag] = n
--~ print("SETTING",tag,n)
chain[#chain+1] = fulltag .. "-" .. n -- insert(chain,tag .. ":" .. n)
stack[#stack+1] = t -- insert(stack,t)
taglist[t] = { unpack(chain) } -- we can add key values for alt and actualtext if needed
texattribute[a_tagged] = t
return t
end
function tags.stop()
local t = stack[#stack] stack[#stack] = nil -- local t = remove(stack)
if not t then
if trace_tags then
report_tags("ignoring end tag, previous chain: %s",#chain > 0 and concat(chain[#chain]) or "none")
end
t = unsetvalue
else
chain[#chain] = nil -- remove(chain)
end
texattribute[a_tagged] = t
return t
end
function tags.last(tag)
return lasttags[tag] -- or false
end
function structures.atlocation(str)
local location = gsub(concat(taglist[texattribute[a_tagged]],"-"),"%-%d+","")
return find(location,topattern(str)) ~= nil
end
function tags.handler(head) -- we need a dummy
return head, false
end
statistics.register("structure elements", function()
if enabled then
return format("%s element chains identified",#taglist)
else
return nil
end
end)
directives.register("backend.addtags", function(v)
if not enabled then
codeinjections.enabletags()
enabled = true
end
end)
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