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if not modules then modules = { } end modules ['bibl-bib'] = {
version = 1.001,
comment = "this module is the basis for the lxml-* ones",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
--[[ldx--
<p>This is a prelude to integrated bibliography support. This file just loads
bibtex files and converts them to xml so that the we access the content
in a convenient way. Actually handling the data takes place elsewhere.</p>
--ldx]]--
local lower, format, gsub = string.lower, string.format, string.gsub
local next = next
local lpegmatch = lpeg.match
bibtex = bibtex or { }
bibtex.size = 0
bibtex.definitions = 0
bibtex.shortcuts = 0
local shortcuts = { }
local data = { }
local entries
local function do_shortcut(tag,key,value)
bibtex.shortcuts = bibtex.shortcuts + 1
if lower(tag) == "@string" then
shortcuts[key] = value
end
end
local function do_definition(tag,key,tab) -- maybe check entries here (saves memory)
if not entries or entries[key] then
bibtex.definitions = bibtex.definitions + 1
local t = { }
for i=1,#tab,2 do
t[tab[i]] = tab[i+1]
end
local p = data[tag]
if not p then
data[tag] = { [key] = t }
else
p[key] = t
end
end
end
local function resolve(s)
return shortcuts[s] or ""
end
local percent = lpeg.P("%")
local start = lpeg.P("@")
local comma = lpeg.P(",")
local hash = lpeg.P("#")
local escape = lpeg.P("\\")
local single = lpeg.P("'")
local double = lpeg.P('"')
local left = lpeg.P('{')
local right = lpeg.P('}')
local both = left + right
local lineending = lpeg.S("\n\r")
local space = lpeg.S(" \t\n\r\f")
local spacing = space^0
local equal = lpeg.P("=")
local collapsed = (space^1)/ " "
local function add(a,b) if b then return a..b else return a end end
local keyword = lpeg.C((lpeg.R("az","AZ","09") + lpeg.S("@_:-"))^1) -- lpeg.C((1-space)^1)
local s_quoted = ((escape*single) + collapsed + (1-single))^0
local d_quoted = ((escape*double) + collapsed + (1-double))^0
local balanced = lpeg.P {
[1] = ((escape * (left+right)) + (1 - (left+right)) + lpeg.V(2))^0,
[2] = left * lpeg.V(1) * right
}
local s_value = (single/"") * s_quoted * (single/"")
local d_value = (double/"") * d_quoted * (double/"")
local b_value = (left /"") * balanced * (right /"")
local r_value = keyword/resolve
local somevalue = s_value + d_value + b_value + r_value
local value = lpeg.Cs((somevalue * ((spacing * hash * spacing)/"" * somevalue)^0))
local assignment = spacing * keyword * spacing * equal * spacing * value * spacing
local shortcut = keyword * spacing * left * spacing * (assignment * comma^0)^0 * spacing * right
local definition = keyword * spacing * left * spacing * keyword * comma * lpeg.Ct((assignment * comma^0)^0) * spacing * right
local comment = keyword * spacing * left * (1-right)^0 * spacing * right
local forget = percent^1 * (1-lineending)^0
-- todo \%
local grammar = (space + forget + shortcut/do_shortcut + definition/do_definition + comment + 1)^0
function bibtex.convert(session,content)
statistics.starttiming(bibtex)
data, shortcuts, entries = session.data, session.shortcuts, session.entries
-- session.size = session.size + #content
bibtex.size = bibtex.size + #content
lpegmatch(grammar,content or "")
statistics.stoptiming(bibtex)
end
function bibtex.load(session,filename)
local filename = resolvers.find_file(filename,"bib")
if filename ~= "" then
bibtex.convert(session,io.loaddata(filename) or "")
end
end
function bibtex.new()
return {
data = { },
shortcuts = { },
xml = xml.convert("<?xml version='1.0' standalone='yes'?>\n<bibtex></bibtex>"),
size = 0,
entries = nil,
}
end
local escaped_pattern = xml.escaped_pattern
local ihatethis = {
f = "\\f",
n = "\\n",
r = "\\r",
s = "\\s",
t = "\\t",
v = "\\v",
z = "\\z",
}
function bibtex.toxml(session)
-- we can always speed this up if needed
-- format slows down things a bit but who cares
statistics.starttiming(bibtex)
local result = { }
local entries = session.entries
result[#result+1] = format("<?xml version='1.0' standalone='yes'?>")
result[#result+1] = format("<bibtex>")
for id, categories in next, session.data do
result[#result+1] = format(" <c n='%s'>",id)
for name, entry in next, categories do
if not entries or entries[name] then
result[#result+1] = format(" <e n='%s'>",name)
for key, value in next, entry do
value = gsub(value,"\\(.)",ihatethis)
value = lpegmatch(escaped_pattern,value)
if value ~= "" then
result[#result+1] = format(" <v n='%s'>%s</v>",key,value)
end
end
result[#result+1] = format(" </e>")
end
end
result[#result+1] = format(" </c>")
end
result[#result+1] = format("</bibtex>")
session.xml = xml.convert(table.concat(result,"\n"))
statistics.stoptiming(bibtex)
end
statistics.register("bibtex load time", function()
local size = bibtex.size
if size > 0 then
return format("%s seconds (%s bytes, %s definitions, %s shortcuts)",
statistics.elapsedtime(bibtex),size,bibtex.definitions,bibtex.shortcuts)
else
return nil
end
end)
--~ str = [[
--~ @COMMENT { CRAP }
--~ @STRING{ hans = "h a n s" }
--~ @STRING{ taco = "t a c o" }
--~ @SOMETHING{ key1, abc = "t a c o" , def = "h a n s" }
--~ @SOMETHING{ key2, abc = hans # taco }
--~ @SOMETHING{ key3, abc = "hans" # taco }
--~ @SOMETHING{ key4, abc = hans # "taco" }
--~ @SOMETHING{ key5, abc = hans # taco # "hans" # "taco"}
--~ @SOMETHING{ key6, abc = {oeps {oeps} oeps} }
--~ ]]
--~ local session = bibtex.new()
--~ bibtex.convert(session,str)
--~ bibtex.toxml(session)
--~ print(session.size,statistics.elapsedtime(bibtex))
--~ local session = bibtex.new()
--~ bibtex.load(session,"IEEEabrv.bib")
--~ bibtex.load(session,"IEEEfull.bib")
--~ bibtex.load(session,"IEEEexample.bib")
--~ bibtex.toxml(session)
--~ print(session.size,statistics.elapsedtime(bibtex))
--~ local session = bibtex.new()
--~ bibtex.load(session,"gut.bib")
--~ bibtex.load(session,"komoedie.bib")
--~ bibtex.load(session,"texbook1.bib")
--~ bibtex.load(session,"texbook2.bib")
--~ bibtex.load(session,"texbook3.bib")
--~ bibtex.load(session,"texgraph.bib")
--~ bibtex.load(session,"texjourn.bib")
--~ bibtex.load(session,"texnique.bib")
--~ bibtex.load(session,"tugboat.bib")
--~ bibtex.toxml(session)
--~ print(session.size,statistics.elapsedtime(bibtex))
--~ print(table.serialize(session.data))
--~ print(table.serialize(session.shortcuts))
--~ print(xml.serialize(session.xml))
-- this will move:
if commands then
local sessions = { }
function commands.definebibtexsession(name)
sessions[name] = bibtex.new()
end
function commands.preparebibtexsession(name)
bibtex.toxml(sessions[name])
lxml.register("bibtex:"..name,sessions[name].xml)
end
function commands.registerbibtexfile(name,filename)
bibtex.load(sessions[name],filename)
end
function commands.registerbibtexentry(name,entry)
local session = sessions[name]
local entries = session.entries
if not entries then
session.entries = { [entry] = true }
else
entries[entry] = true
end
end
end
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