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-rw-r--r--tex/context/base/bibl-bib.lua1532
1 files changed, 766 insertions, 766 deletions
diff --git a/tex/context/base/bibl-bib.lua b/tex/context/base/bibl-bib.lua
index ab38a0b28..c86a0c0c2 100644
--- a/tex/context/base/bibl-bib.lua
+++ b/tex/context/base/bibl-bib.lua
@@ -1,766 +1,766 @@
-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, concat = string.lower, string.format, string.gsub, table.concat
-local next = next
-local utfchar = utf.char
-local lpegmatch, lpegpatterns = lpeg.match, lpeg.patterns
-local textoutf = characters and characters.tex.toutf
-local variables = interfaces and interfaces.variables
-local settings_to_hash = utilities.parsers.settings_to_hash
-local finalizers = xml.finalizers.tex
-local xmlfilter, xmltext, getid = xml.filter, xml.text, lxml.getid
-local formatters = string.formatters
-
-local P, R, S, C, Cc, Cs, Ct = lpeg.P, lpeg.R, lpeg.S, lpeg.C, lpeg.Cc, lpeg.Cs, lpeg.Ct
-
-local trace_bibxml = false trackers.register("publications.bibxml", function(v) trace_bibtex = v end)
-
-local report_xml = logs.reporter("publications","xml")
-
-bibtex = bibtex or { }
-local bibtex = bibtex
-
-bibtex.statistics = bibtex.statistics or { }
-local bibtexstats = bibtex.statistics
-
-bibtexstats.nofbytes = 0
-bibtexstats.nofdefinitions = 0
-bibtexstats.nofshortcuts = 0
-
-local defaultshortcuts = {
- jan = "1",
- feb = "2",
- mar = "3",
- apr = "4",
- may = "5",
- jun = "6",
- jul = "7",
- aug = "8",
- sep = "9",
- oct = "10",
- nov = "11",
- dec = "12",
-}
-
-local shortcuts = { }
-local data = { }
-local entries
-
--- Currently we expand shortcuts and for large ones (like the acknowledgements
--- in tugboat.bib this is not that efficient. However, eventually strings get
--- hashed again.
-
-local function do_shortcut(tag,key,value)
- bibtexstats.nofshortcuts = bibtexstats.nofshortcuts + 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
- bibtexstats.nofdefinitions = bibtexstats.nofdefinitions + 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 defaultshortcuts[s] or s -- can be number
-end
-
-local percent = P("%")
-local start = P("@")
-local comma = P(",")
-local hash = P("#")
-local escape = P("\\")
-local single = P("'")
-local double = P('"')
-local left = P('{')
-local right = P('}')
-local both = left + right
-local lineending = S("\n\r")
-local space = S(" \t\n\r\f")
-local spacing = space^0
-local equal = P("=")
-local collapsed = (space^1)/ " "
-
-local function add(a,b) if b then return a..b else return a end end
-
-local keyword = C((R("az","AZ","09") + S("@_:-"))^1) -- C((1-space)^1)
-local s_quoted = ((escape*single) + collapsed + (1-single))^0
-local d_quoted = ((escape*double) + collapsed + (1-double))^0
-local balanced = lpegpatterns.balanced
-
-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 = 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 * 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
- bibtexstats.nofbytes = bibtexstats.nofbytes + #content
- session.nofbytes = session.nofbytes + #content
- lpegmatch(grammar,content or "")
- statistics.stoptiming(bibtex)
-end
-
-function bibtex.load(session,filename)
- local filename = resolvers.findfile(filename,"bib")
- if filename ~= "" then
- local data = io.loaddata(filename) or ""
- if data == "" then
- report_xml("empty file %a, no conversion to xml",filename)
- elseif trace_bibxml then
- report_xml("converting file %a to xml",filename)
- end
- bibtex.convert(session,data)
- end
-end
-
-function bibtex.new()
- return {
- data = { },
- shortcuts = { },
- xml = xml.convert("<?xml version='1.0' standalone='yes'?>\n<bibtex></bibtex>"),
- nofbytes = 0,
- entries = nil,
- loaded = false,
- }
-end
-
-local p_escaped = lpegpatterns.xml.escaped
-
-local ihatethis = {
- f = "\\f",
- n = "\\n",
- r = "\\r",
- s = "\\s",
- t = "\\t",
- v = "\\v",
- z = "\\z",
-}
-
-local command = P("\\")/"" * Cc("\\bibtexcommand{") * (R("az","AZ")^1) * Cc("}")
-local any = P(1)
-local done = P(-1)
-local one_l = P("{") / ""
-local one_r = P("}") / ""
-local two_l = P("{{") / ""
-local two_r = P("}}") / ""
-
-local filter = Cs(
- two_l * (command + any - two_r - done)^0 * two_r * done +
- one_l * (command + any - one_r - done)^0 * one_r * done +
- (command + any )^0
-)
-
-function bibtex.toxml(session,options)
- if session.loaded then
- return
- else
- session.loaded = true
- end
- -- we can always speed this up if needed
- -- format slows down things a bit but who cares
- statistics.starttiming(bibtex)
- local result, r = { }, 0
- local options = settings_to_hash(options)
- local convert = options.convert -- todo: interface
- local strip = options.strip -- todo: interface
- local entries = session.entries
- r = r + 1 ; result[r] = "<?xml version='1.0' standalone='yes'?>"
- r = r + 1 ; result[r] = "<bibtex>"
- for id, categories in next, session.data do
- id = lower(gsub(id,"^@",""))
- for name, entry in next, categories do
- if not entries or entries[name] then
- r = r + 1 ; result[r] = formatters["<entry tag='%s' category='%s'>"](lower(name),id)
- for key, value in next, entry do
- value = gsub(value,"\\(.)",ihatethis) -- this really needs checking
- value = lpegmatch(p_escaped,value)
- if value ~= "" then
- if convert then
- value = textoutf(value,true)
- end
- if strip then
- -- as there is no proper namespace in bibtex we need this
- -- kind of hackery ... bibtex databases are quite unportable
- value = lpegmatch(filter,value) or value
- end
- r = r + 1 ; result[r] = formatters[" <field name='%s'>%s</field>"](key,value)
- end
- end
- r = r + 1 ; result[r] = "</entry>"
- end
- end
- end
- r = r + 1 ; result[r] = "</bibtex>"
- result = concat(result,"\n")
- -- alternatively we could use lxml.convert
- session.xml = xml.convert(result, {
- resolve_entities = true,
- resolve_predefined_entities = true, -- in case we have escaped entities
- -- unify_predefined_entities = true, -- &#038; -> &amp;
- utfize_entities = true,
- } )
- session.data = nil
- session.shortcuts = nil
- statistics.stoptiming(bibtex)
-end
-
-statistics.register("bibtex load time", function()
- local nofbytes = bibtexstats.nofbytes
- if nofbytes > 0 then
- return format("%s seconds (%s bytes, %s definitions, %s shortcuts)",
- statistics.elapsedtime(bibtex),nofbytes,bibtexstats.nofdefinitions,bibtexstats.nofshortcuts)
- 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.nofbytes,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.nofbytes,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.nofbytes,statistics.elapsedtime(bibtex))
-
---~ print(table.serialize(session.data))
---~ print(table.serialize(session.shortcuts))
---~ print(xml.serialize(session.xml))
-
-if not characters then dofile(resolvers.findfile("char-def.lua")) end
-
-local chardata = characters.data
-local concat = table.concat
-
-local lpeg = lpeg
-
-local P, Ct, lpegmatch, lpegpatterns = lpeg.P, lpeg.Ct, lpeg.match, lpeg.patterns
-
-local space, comma = P(" "), P(",")
-
-local andsplitter = lpeg.tsplitat(space^1 * "and" * space^1)
-local commasplitter = lpeg.tsplitat(space^0 * comma * space^0)
-local spacesplitter = lpeg.tsplitat(space^1)
-local firstcharacter = lpegpatterns.utf8byte
-
-local function is_upper(str)
- local first = lpegmatch(firstcharacter,str)
- local okay = chardata[first]
- return okay and okay.category == "lu"
-end
-
-local function splitauthors(str)
- local authors = lpegmatch(andsplitter,str)
- for i=1,#authors do
- local firstnames, vons, surnames, initials, juniors, words
- local author = authors[i]
- local split = lpegmatch(commasplitter,author)
- local n = #split
- if n == 1 then
- --~ First von Last
- words = lpegmatch(spacesplitter,author)
- firstnames, vons, surnames = { }, { }, { }
- local i, n = 1, #words
- while i <= n do
- local w = words[i]
- if is_upper(w) then
- firstnames[#firstnames+1], i = w, i + 1
- else
- break
- end
- end
- while i <= n do
- local w = words[i]
- if is_upper(w) then
- break
- else
- vons[#vons+1], i = w, i + 1
- end
- end
- while i <= n do
- surnames[#surnames+1], i = words[i], i + 1
- end
- elseif n == 2 then
- --~ von Last, First
- words = lpegmatch(spacesplitter,split[2])
- surnames = lpegmatch(spacesplitter,split[1])
- firstnames, vons = { }, { }
- local i, n = 1, #words
- while i <= n do
- local w = words[i]
- if is_upper(w) then
- firstnames[#firstnames+1], i = w, i + 1
- else
- break
- end
- end
- while i <= n do
- vons[#vons+1], i = words[i], i + 1
- end
- else
- --~ von Last, Jr ,First
- firstnames = lpegmatch(spacesplitter,split[1])
- juniors = lpegmatch(spacesplitter,split[2])
- surnames = lpegmatch(spacesplitter,split[3])
- if n > 3 then
- -- error
- end
- end
- if #surnames == 0 then
- surnames[1] = firstnames[#firstnames]
- firstnames[#firstnames] = nil
- end
- if firstnames then
- initials = { }
- for i=1,#firstnames do
- initials[i] = utfchar(lpegmatch(firstcharacter,firstnames[i]))
- end
- end
- authors[i] = {
- original = author,
- firstnames = firstnames,
- vons = vons,
- surnames = surnames,
- initials = initials,
- juniors = juniors,
- }
- end
- authors.original = str
- return authors
-end
-
-local function the_initials(initials,symbol)
- local t, symbol = { }, symbol or "."
- for i=1,#initials do
- t[i] = initials[i] .. symbol
- end
- return t
-end
-
--- authors
-
-bibtex.authors = bibtex.authors or { }
-
-local authors = bibtex.authors
-
-local defaultsettings = {
- firstnamesep = " ",
- vonsep = " ",
- surnamesep = " ",
- juniorsep = " ",
- surnamejuniorsep = ", ",
- juniorjuniorsep = ", ",
- surnamefirstnamesep = ", ",
- surnameinitialsep = ", ",
- namesep = ", ",
- lastnamesep = " and ",
- finalnamesep = " and ",
-}
-
-function authors.normal(author,settings)
- local firstnames, vons, surnames, juniors = author.firstnames, author.vons, author.surnames, author.juniors
- local result, settings = { }, settings or defaultsettings
- if firstnames and #firstnames > 0 then
- result[#result+1] = concat(firstnames," ")
- result[#result+1] = settings.firstnamesep or defaultsettings.firstnamesep
- end
- if vons and #vons > 0 then
- result[#result+1] = concat(vons," ")
- result[#result+1] = settings.vonsep or defaultsettings.vonsep
- end
- if surnames then
- result[#result+1] = concat(surnames," ")
- end
- if juniors and #juniors > 0 then
- result[#result+1] = concat(juniors," ")
- result[#result+1] = settings.surnamesep or defaultsettings.surnamesep
- end
- return concat(result)
-end
-
-function authors.normalshort(author,settings)
- local firstnames, vons, surnames, juniors = author.firstnames, author.vons, author.surnames, author.juniors
- local result, settings = { }, settings or defaultsettings
- if firstnames and #firstnames > 0 then
- result[#result+1] = concat(firstnames," ")
- result[#result+1] = settings.firstnamesep or defaultsettings.firstnamesep
- end
- if vons and #vons > 0 then
- result[#result+1] = concat(vons," ")
- result[#result+1] = settings.vonsep or defaultsettings.vonsep
- end
- if surnames then
- result[#result+1] = concat(surnames," ")
- end
- if juniors and #juniors > 0 then
- result[#result+1] = concat(juniors," ")
- result[#result+1] = settings.surnamejuniorsep or defaultsettings.surnamejuniorsep
- end
- return concat(result)
-end
-
-function authors.inverted(author,settings)
- local firstnames, vons, surnames, juniors = author.firstnames, author.vons, author.surnames, author.juniors
- local result, settings = { }, settings or defaultsettings
- if vons and #vons > 0 then
- result[#result+1] = concat(vons," ")
- result[#result+1] = settings.vonsep or defaultsettings.vonsep
- end
- if surnames then
- result[#result+1] = concat(surnames," ")
- end
- if juniors and #juniors > 0 then
- result[#result+1] = settings.juniorjuniorsep or defaultsettings.juniorjuniorsep
- result[#result+1] = concat(juniors," ")
- end
- if firstnames and #firstnames > 0 then
- result[#result+1] = settings.surnamefirstnamesep or defaultsettings.surnamefirstnamesep
- result[#result+1] = concat(firstnames," ")
- end
- return concat(result)
-end
-
-function authors.invertedshort(author,settings)
- local vons, surnames, initials, juniors = author.vons, author.surnames, author.initials, author.juniors
- local result, settings = { }, settings or defaultsettings
- if vons and #vons > 0 then
- result[#result+1] = concat(vons," ")
- result[#result+1] = settings.vonsep or defaultsettings.vonsep
- end
- if surnames then
- result[#result+1] = concat(surnames," ")
- end
- if juniors and #juniors > 0 then
- result[#result+1] = settings.juniorjuniorsep or defaultsettings.juniorjuniorsep
- result[#result+1] = concat(juniors," ")
- end
- if initials and #initials > 0 then
- result[#result+1] = settings.surnameinitialsep or defaultsettings.surnameinitialsep
- result[#result+1] = concat(the_initials(initials)," ")
- end
- return concat(result)
-end
-
-local lastconcatsize = 1
-
-local function bibtexconcat(t,settings)
- local namesep = settings.namesep or defaultsettings.namesep or ", "
- local lastnamesep = settings.lastnamesep or defaultsettings.lastnamesep or namesep
- local finalnamesep = settings.finalnamesep or defaultsettings.finalnamesep or lastnamesep
- local lastconcatsize = #t
- if lastconcatsize > 2 then
- local s = { }
- for i=1,lastconcatsize-2 do
- s[i] = t[i] .. namesep
- end
- s[lastconcatsize-1], s[lastconcatsize] = t[lastconcatsize-1] .. finalnamesep, t[lastconcatsize]
- return concat(s)
- elseif lastconcatsize > 1 then
- return concat(t,lastnamesep)
- elseif lastconcatsize > 0 then
- return t[1]
- else
- return ""
- end
-end
-
-function authors.concat(author,combiner,what,settings)
- if type(combiner) == "string" then
- combiner = authors[combiner or "normal"] or authors.normal
- end
- local split = splitauthors(author)
- local setting = settings[what]
- local etallimit, etaldisplay, etaltext = 1000, 1000, ""
- if setting then
- etallimit = settings.etallimit or 1000
- etaldisplay = settings.etaldisplay or etallimit
- etalltext = settings.etaltext or ""
- end
- local max = #split
- if max > etallimit and etaldisplay < max then
- max = etaldisplay
- end
- for i=1,max do
- split[i] = combiner(split[i],settings)
- end
- local result = bibtexconcat(split,settings)
- if max < #split then
- return result
- else
- return result .. etaltext
- end
-end
-
-function authors.short(author,year)
- local result = { }
- if author then
- local authors = splitauthors(author)
- for a=1,#authors do
- local aa = authors[a]
- local initials = aa.initials
- for i=1,#initials do
- result[#result+1] = initials[i]
- end
- local surnames = aa.surnames
- for s=1,#surnames do
- result[#result+1] = utfchar(lpegmatch(firstcharacter,surnames[s]))
- end
- end
- end
- if year then
- result[#result+1] = year
- end
- return concat(result)
-end
-
--- We can consider creating a hashtable key -> entry but I wonder if
--- pays off.
-
-local function collectauthoryears(id,list)
- list = settings_to_hash(list)
- id = getid(id)
- local found = { }
- for e in xml.collected(id,"/bibtex/entry") do
- if list[e.at.tag] then
- local year = xmlfilter(e,"xml:///field[@name='year']/text()")
- local author = xmlfilter(e,"xml:///field[@name='author']/text()")
- if author and year then
- local a = found[author]
- if not a then
- a = { }
- found[author] = a
- end
- local y = a[year]
- if not y then
- y = { }
- a[year] = y
- end
- y[#y+1] = e
- end
- end
- end
- -- found = { author = { year_1 = { e1, e2, e3 } } }
- local done = { }
- for author, years in next, found do
- local yrs = { }
- for year, entries in next, years do
- if subyears then
- -- -- add letters to all entries of an author and if so shouldn't
- -- -- we tag all years of an author as soon as we do this?
- -- if #entries > 1 then
- -- for i=1,#years do
- -- local entry = years[i]
- -- -- years[i] = year .. string.char(i + string.byte("0") - 1)
- -- end
- -- end
- else
- yrs[#yrs+1] = year
- end
- end
- done[author] = yrs
- end
- return done
-end
-
-local method, settings = "normal", { }
-
-function authors.setsettings(s)
- settings = s or settings
-end
-
-if commands then
-
- local sessions = { }
-
- function commands.definebibtexsession(name)
- sessions[name] = bibtex.new()
- end
-
- function commands.preparebibtexsession(name,xmlname,options)
- bibtex.toxml(sessions[name],options)
- lxml.register(xmlname,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 } -- here we can keep more info
- else
- entries[entry] = true
- end
- end
-
- -- commands.bibtexconcat = bibtexconcat
-
- -- finalizers can be rather dumb as we have just text and no embedded xml
-
- function finalizers.bibtexconcat(collected,method,what)
- if collected then
- local author = collected[1].dt[1] or ""
- if author ~= "" then
- context(authors.concat(author,method,what,settings))
- end
- end
- end
-
- function finalizers.bibtexshort(collected)
- if collected then
- local c = collected[1]
- local year = xmlfilter(c,"xml://field[@name='year']/text()")
- local author = xmlfilter(c,"xml://field[@name='author']/text()")
- context(authors.short(author,year))
- end
- end
-
- -- experiment:
-
- --~ -- alternative approach: keep data at the tex end
-
- --~ local function xbibtexconcat(t,sep,finalsep,lastsep)
- --~ local n = #t
- --~ if n > 0 then
- --~ context(t[1])
- --~ if n > 1 then
- --~ if n > 2 then
- --~ for i=2,n-1 do
- --~ context.bibtexpublicationsparameter("sep")
- --~ context(t[i])
- --~ end
- --~ context.bibtexpublicationsparameter("finalsep")
- --~ else
- --~ context.bibtexpublicationsparameter("lastsep")
- --~ end
- --~ context(t[n])
- --~ end
- --~ end
- --~ end
-
- -- todo : sort
-
- -- todo: choose between bibtex or commands namespace
-
- function bibtex.authorref(id,list)
- local result = collectauthoryears(id,list,method,what)
- for author, years in next, result do
- context(authors.concat(author,method,what,settings))
- end
- end
-
- function bibtex.authoryearref(id,list)
- local result = collectauthoryears(id,list,method,what)
- for author, years in next, result do
- context("%s (%s)",authors.concat(author,method,what,settings),concat(years,", "))
- end
- end
-
- function bibtex.authoryearsref(id,list)
- local result = collectauthoryears(id,list,method,what)
- for author, years in next, result do
- context("(%s, %s)",authors.concat(author,method,what,settings),concat(years,", "))
- end
- end
-
- function bibtex.singularorplural(singular,plural)
- if lastconcatsize and lastconcatsize > 1 then
- context(plural)
- else
- context(singular)
- end
- end
-
-end
-
-
---~ local function test(sample)
---~ local authors = splitauthors(sample)
---~ print(table.serialize(authors))
---~ for i=1,#authors do
---~ local author = authors[i]
---~ print(normalauthor (author,settings))
---~ print(normalshortauthor (author,settings))
---~ print(invertedauthor (author,settings))
---~ print(invertedshortauthor(author,settings))
---~ end
---~ print(concatauthors(sample,settings,normalauthor))
---~ print(concatauthors(sample,settings,normalshortauthor))
---~ print(concatauthors(sample,settings,invertedauthor))
---~ print(concatauthors(sample,settings,invertedshortauthor))
---~ end
-
---~ local sample_a = "Hagen, Hans and Hoekwater, Taco Whoever T. Ex. and Henkel Hut, Hartmut Harald von der"
---~ local sample_b = "Hans Hagen and Taco Whoever T. Ex. Hoekwater and Hartmut Harald von der Henkel Hut"
-
---~ test(sample_a)
---~ test(sample_b)
+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, concat = string.lower, string.format, string.gsub, table.concat
+local next = next
+local utfchar = utf.char
+local lpegmatch, lpegpatterns = lpeg.match, lpeg.patterns
+local textoutf = characters and characters.tex.toutf
+local variables = interfaces and interfaces.variables
+local settings_to_hash = utilities.parsers.settings_to_hash
+local finalizers = xml.finalizers.tex
+local xmlfilter, xmltext, getid = xml.filter, xml.text, lxml.getid
+local formatters = string.formatters
+
+local P, R, S, C, Cc, Cs, Ct = lpeg.P, lpeg.R, lpeg.S, lpeg.C, lpeg.Cc, lpeg.Cs, lpeg.Ct
+
+local trace_bibxml = false trackers.register("publications.bibxml", function(v) trace_bibtex = v end)
+
+local report_xml = logs.reporter("publications","xml")
+
+bibtex = bibtex or { }
+local bibtex = bibtex
+
+bibtex.statistics = bibtex.statistics or { }
+local bibtexstats = bibtex.statistics
+
+bibtexstats.nofbytes = 0
+bibtexstats.nofdefinitions = 0
+bibtexstats.nofshortcuts = 0
+
+local defaultshortcuts = {
+ jan = "1",
+ feb = "2",
+ mar = "3",
+ apr = "4",
+ may = "5",
+ jun = "6",
+ jul = "7",
+ aug = "8",
+ sep = "9",
+ oct = "10",
+ nov = "11",
+ dec = "12",
+}
+
+local shortcuts = { }
+local data = { }
+local entries
+
+-- Currently we expand shortcuts and for large ones (like the acknowledgements
+-- in tugboat.bib this is not that efficient. However, eventually strings get
+-- hashed again.
+
+local function do_shortcut(tag,key,value)
+ bibtexstats.nofshortcuts = bibtexstats.nofshortcuts + 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
+ bibtexstats.nofdefinitions = bibtexstats.nofdefinitions + 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 defaultshortcuts[s] or s -- can be number
+end
+
+local percent = P("%")
+local start = P("@")
+local comma = P(",")
+local hash = P("#")
+local escape = P("\\")
+local single = P("'")
+local double = P('"')
+local left = P('{')
+local right = P('}')
+local both = left + right
+local lineending = S("\n\r")
+local space = S(" \t\n\r\f")
+local spacing = space^0
+local equal = P("=")
+local collapsed = (space^1)/ " "
+
+local function add(a,b) if b then return a..b else return a end end
+
+local keyword = C((R("az","AZ","09") + S("@_:-"))^1) -- C((1-space)^1)
+local s_quoted = ((escape*single) + collapsed + (1-single))^0
+local d_quoted = ((escape*double) + collapsed + (1-double))^0
+local balanced = lpegpatterns.balanced
+
+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 = 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 * 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
+ bibtexstats.nofbytes = bibtexstats.nofbytes + #content
+ session.nofbytes = session.nofbytes + #content
+ lpegmatch(grammar,content or "")
+ statistics.stoptiming(bibtex)
+end
+
+function bibtex.load(session,filename)
+ local filename = resolvers.findfile(filename,"bib")
+ if filename ~= "" then
+ local data = io.loaddata(filename) or ""
+ if data == "" then
+ report_xml("empty file %a, no conversion to xml",filename)
+ elseif trace_bibxml then
+ report_xml("converting file %a to xml",filename)
+ end
+ bibtex.convert(session,data)
+ end
+end
+
+function bibtex.new()
+ return {
+ data = { },
+ shortcuts = { },
+ xml = xml.convert("<?xml version='1.0' standalone='yes'?>\n<bibtex></bibtex>"),
+ nofbytes = 0,
+ entries = nil,
+ loaded = false,
+ }
+end
+
+local p_escaped = lpegpatterns.xml.escaped
+
+local ihatethis = {
+ f = "\\f",
+ n = "\\n",
+ r = "\\r",
+ s = "\\s",
+ t = "\\t",
+ v = "\\v",
+ z = "\\z",
+}
+
+local command = P("\\")/"" * Cc("\\bibtexcommand{") * (R("az","AZ")^1) * Cc("}")
+local any = P(1)
+local done = P(-1)
+local one_l = P("{") / ""
+local one_r = P("}") / ""
+local two_l = P("{{") / ""
+local two_r = P("}}") / ""
+
+local filter = Cs(
+ two_l * (command + any - two_r - done)^0 * two_r * done +
+ one_l * (command + any - one_r - done)^0 * one_r * done +
+ (command + any )^0
+)
+
+function bibtex.toxml(session,options)
+ if session.loaded then
+ return
+ else
+ session.loaded = true
+ end
+ -- we can always speed this up if needed
+ -- format slows down things a bit but who cares
+ statistics.starttiming(bibtex)
+ local result, r = { }, 0
+ local options = settings_to_hash(options)
+ local convert = options.convert -- todo: interface
+ local strip = options.strip -- todo: interface
+ local entries = session.entries
+ r = r + 1 ; result[r] = "<?xml version='1.0' standalone='yes'?>"
+ r = r + 1 ; result[r] = "<bibtex>"
+ for id, categories in next, session.data do
+ id = lower(gsub(id,"^@",""))
+ for name, entry in next, categories do
+ if not entries or entries[name] then
+ r = r + 1 ; result[r] = formatters["<entry tag='%s' category='%s'>"](lower(name),id)
+ for key, value in next, entry do
+ value = gsub(value,"\\(.)",ihatethis) -- this really needs checking
+ value = lpegmatch(p_escaped,value)
+ if value ~= "" then
+ if convert then
+ value = textoutf(value,true)
+ end
+ if strip then
+ -- as there is no proper namespace in bibtex we need this
+ -- kind of hackery ... bibtex databases are quite unportable
+ value = lpegmatch(filter,value) or value
+ end
+ r = r + 1 ; result[r] = formatters[" <field name='%s'>%s</field>"](key,value)
+ end
+ end
+ r = r + 1 ; result[r] = "</entry>"
+ end
+ end
+ end
+ r = r + 1 ; result[r] = "</bibtex>"
+ result = concat(result,"\n")
+ -- alternatively we could use lxml.convert
+ session.xml = xml.convert(result, {
+ resolve_entities = true,
+ resolve_predefined_entities = true, -- in case we have escaped entities
+ -- unify_predefined_entities = true, -- &#038; -> &amp;
+ utfize_entities = true,
+ } )
+ session.data = nil
+ session.shortcuts = nil
+ statistics.stoptiming(bibtex)
+end
+
+statistics.register("bibtex load time", function()
+ local nofbytes = bibtexstats.nofbytes
+ if nofbytes > 0 then
+ return format("%s seconds (%s bytes, %s definitions, %s shortcuts)",
+ statistics.elapsedtime(bibtex),nofbytes,bibtexstats.nofdefinitions,bibtexstats.nofshortcuts)
+ 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.nofbytes,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.nofbytes,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.nofbytes,statistics.elapsedtime(bibtex))
+
+--~ print(table.serialize(session.data))
+--~ print(table.serialize(session.shortcuts))
+--~ print(xml.serialize(session.xml))
+
+if not characters then dofile(resolvers.findfile("char-def.lua")) end
+
+local chardata = characters.data
+local concat = table.concat
+
+local lpeg = lpeg
+
+local P, Ct, lpegmatch, lpegpatterns = lpeg.P, lpeg.Ct, lpeg.match, lpeg.patterns
+
+local space, comma = P(" "), P(",")
+
+local andsplitter = lpeg.tsplitat(space^1 * "and" * space^1)
+local commasplitter = lpeg.tsplitat(space^0 * comma * space^0)
+local spacesplitter = lpeg.tsplitat(space^1)
+local firstcharacter = lpegpatterns.utf8byte
+
+local function is_upper(str)
+ local first = lpegmatch(firstcharacter,str)
+ local okay = chardata[first]
+ return okay and okay.category == "lu"
+end
+
+local function splitauthors(str)
+ local authors = lpegmatch(andsplitter,str)
+ for i=1,#authors do
+ local firstnames, vons, surnames, initials, juniors, words
+ local author = authors[i]
+ local split = lpegmatch(commasplitter,author)
+ local n = #split
+ if n == 1 then
+ --~ First von Last
+ words = lpegmatch(spacesplitter,author)
+ firstnames, vons, surnames = { }, { }, { }
+ local i, n = 1, #words
+ while i <= n do
+ local w = words[i]
+ if is_upper(w) then
+ firstnames[#firstnames+1], i = w, i + 1
+ else
+ break
+ end
+ end
+ while i <= n do
+ local w = words[i]
+ if is_upper(w) then
+ break
+ else
+ vons[#vons+1], i = w, i + 1
+ end
+ end
+ while i <= n do
+ surnames[#surnames+1], i = words[i], i + 1
+ end
+ elseif n == 2 then
+ --~ von Last, First
+ words = lpegmatch(spacesplitter,split[2])
+ surnames = lpegmatch(spacesplitter,split[1])
+ firstnames, vons = { }, { }
+ local i, n = 1, #words
+ while i <= n do
+ local w = words[i]
+ if is_upper(w) then
+ firstnames[#firstnames+1], i = w, i + 1
+ else
+ break
+ end
+ end
+ while i <= n do
+ vons[#vons+1], i = words[i], i + 1
+ end
+ else
+ --~ von Last, Jr ,First
+ firstnames = lpegmatch(spacesplitter,split[1])
+ juniors = lpegmatch(spacesplitter,split[2])
+ surnames = lpegmatch(spacesplitter,split[3])
+ if n > 3 then
+ -- error
+ end
+ end
+ if #surnames == 0 then
+ surnames[1] = firstnames[#firstnames]
+ firstnames[#firstnames] = nil
+ end
+ if firstnames then
+ initials = { }
+ for i=1,#firstnames do
+ initials[i] = utfchar(lpegmatch(firstcharacter,firstnames[i]))
+ end
+ end
+ authors[i] = {
+ original = author,
+ firstnames = firstnames,
+ vons = vons,
+ surnames = surnames,
+ initials = initials,
+ juniors = juniors,
+ }
+ end
+ authors.original = str
+ return authors
+end
+
+local function the_initials(initials,symbol)
+ local t, symbol = { }, symbol or "."
+ for i=1,#initials do
+ t[i] = initials[i] .. symbol
+ end
+ return t
+end
+
+-- authors
+
+bibtex.authors = bibtex.authors or { }
+
+local authors = bibtex.authors
+
+local defaultsettings = {
+ firstnamesep = " ",
+ vonsep = " ",
+ surnamesep = " ",
+ juniorsep = " ",
+ surnamejuniorsep = ", ",
+ juniorjuniorsep = ", ",
+ surnamefirstnamesep = ", ",
+ surnameinitialsep = ", ",
+ namesep = ", ",
+ lastnamesep = " and ",
+ finalnamesep = " and ",
+}
+
+function authors.normal(author,settings)
+ local firstnames, vons, surnames, juniors = author.firstnames, author.vons, author.surnames, author.juniors
+ local result, settings = { }, settings or defaultsettings
+ if firstnames and #firstnames > 0 then
+ result[#result+1] = concat(firstnames," ")
+ result[#result+1] = settings.firstnamesep or defaultsettings.firstnamesep
+ end
+ if vons and #vons > 0 then
+ result[#result+1] = concat(vons," ")
+ result[#result+1] = settings.vonsep or defaultsettings.vonsep
+ end
+ if surnames then
+ result[#result+1] = concat(surnames," ")
+ end
+ if juniors and #juniors > 0 then
+ result[#result+1] = concat(juniors," ")
+ result[#result+1] = settings.surnamesep or defaultsettings.surnamesep
+ end
+ return concat(result)
+end
+
+function authors.normalshort(author,settings)
+ local firstnames, vons, surnames, juniors = author.firstnames, author.vons, author.surnames, author.juniors
+ local result, settings = { }, settings or defaultsettings
+ if firstnames and #firstnames > 0 then
+ result[#result+1] = concat(firstnames," ")
+ result[#result+1] = settings.firstnamesep or defaultsettings.firstnamesep
+ end
+ if vons and #vons > 0 then
+ result[#result+1] = concat(vons," ")
+ result[#result+1] = settings.vonsep or defaultsettings.vonsep
+ end
+ if surnames then
+ result[#result+1] = concat(surnames," ")
+ end
+ if juniors and #juniors > 0 then
+ result[#result+1] = concat(juniors," ")
+ result[#result+1] = settings.surnamejuniorsep or defaultsettings.surnamejuniorsep
+ end
+ return concat(result)
+end
+
+function authors.inverted(author,settings)
+ local firstnames, vons, surnames, juniors = author.firstnames, author.vons, author.surnames, author.juniors
+ local result, settings = { }, settings or defaultsettings
+ if vons and #vons > 0 then
+ result[#result+1] = concat(vons," ")
+ result[#result+1] = settings.vonsep or defaultsettings.vonsep
+ end
+ if surnames then
+ result[#result+1] = concat(surnames," ")
+ end
+ if juniors and #juniors > 0 then
+ result[#result+1] = settings.juniorjuniorsep or defaultsettings.juniorjuniorsep
+ result[#result+1] = concat(juniors," ")
+ end
+ if firstnames and #firstnames > 0 then
+ result[#result+1] = settings.surnamefirstnamesep or defaultsettings.surnamefirstnamesep
+ result[#result+1] = concat(firstnames," ")
+ end
+ return concat(result)
+end
+
+function authors.invertedshort(author,settings)
+ local vons, surnames, initials, juniors = author.vons, author.surnames, author.initials, author.juniors
+ local result, settings = { }, settings or defaultsettings
+ if vons and #vons > 0 then
+ result[#result+1] = concat(vons," ")
+ result[#result+1] = settings.vonsep or defaultsettings.vonsep
+ end
+ if surnames then
+ result[#result+1] = concat(surnames," ")
+ end
+ if juniors and #juniors > 0 then
+ result[#result+1] = settings.juniorjuniorsep or defaultsettings.juniorjuniorsep
+ result[#result+1] = concat(juniors," ")
+ end
+ if initials and #initials > 0 then
+ result[#result+1] = settings.surnameinitialsep or defaultsettings.surnameinitialsep
+ result[#result+1] = concat(the_initials(initials)," ")
+ end
+ return concat(result)
+end
+
+local lastconcatsize = 1
+
+local function bibtexconcat(t,settings)
+ local namesep = settings.namesep or defaultsettings.namesep or ", "
+ local lastnamesep = settings.lastnamesep or defaultsettings.lastnamesep or namesep
+ local finalnamesep = settings.finalnamesep or defaultsettings.finalnamesep or lastnamesep
+ local lastconcatsize = #t
+ if lastconcatsize > 2 then
+ local s = { }
+ for i=1,lastconcatsize-2 do
+ s[i] = t[i] .. namesep
+ end
+ s[lastconcatsize-1], s[lastconcatsize] = t[lastconcatsize-1] .. finalnamesep, t[lastconcatsize]
+ return concat(s)
+ elseif lastconcatsize > 1 then
+ return concat(t,lastnamesep)
+ elseif lastconcatsize > 0 then
+ return t[1]
+ else
+ return ""
+ end
+end
+
+function authors.concat(author,combiner,what,settings)
+ if type(combiner) == "string" then
+ combiner = authors[combiner or "normal"] or authors.normal
+ end
+ local split = splitauthors(author)
+ local setting = settings[what]
+ local etallimit, etaldisplay, etaltext = 1000, 1000, ""
+ if setting then
+ etallimit = settings.etallimit or 1000
+ etaldisplay = settings.etaldisplay or etallimit
+ etalltext = settings.etaltext or ""
+ end
+ local max = #split
+ if max > etallimit and etaldisplay < max then
+ max = etaldisplay
+ end
+ for i=1,max do
+ split[i] = combiner(split[i],settings)
+ end
+ local result = bibtexconcat(split,settings)
+ if max < #split then
+ return result
+ else
+ return result .. etaltext
+ end
+end
+
+function authors.short(author,year)
+ local result = { }
+ if author then
+ local authors = splitauthors(author)
+ for a=1,#authors do
+ local aa = authors[a]
+ local initials = aa.initials
+ for i=1,#initials do
+ result[#result+1] = initials[i]
+ end
+ local surnames = aa.surnames
+ for s=1,#surnames do
+ result[#result+1] = utfchar(lpegmatch(firstcharacter,surnames[s]))
+ end
+ end
+ end
+ if year then
+ result[#result+1] = year
+ end
+ return concat(result)
+end
+
+-- We can consider creating a hashtable key -> entry but I wonder if
+-- pays off.
+
+local function collectauthoryears(id,list)
+ list = settings_to_hash(list)
+ id = getid(id)
+ local found = { }
+ for e in xml.collected(id,"/bibtex/entry") do
+ if list[e.at.tag] then
+ local year = xmlfilter(e,"xml:///field[@name='year']/text()")
+ local author = xmlfilter(e,"xml:///field[@name='author']/text()")
+ if author and year then
+ local a = found[author]
+ if not a then
+ a = { }
+ found[author] = a
+ end
+ local y = a[year]
+ if not y then
+ y = { }
+ a[year] = y
+ end
+ y[#y+1] = e
+ end
+ end
+ end
+ -- found = { author = { year_1 = { e1, e2, e3 } } }
+ local done = { }
+ for author, years in next, found do
+ local yrs = { }
+ for year, entries in next, years do
+ if subyears then
+ -- -- add letters to all entries of an author and if so shouldn't
+ -- -- we tag all years of an author as soon as we do this?
+ -- if #entries > 1 then
+ -- for i=1,#years do
+ -- local entry = years[i]
+ -- -- years[i] = year .. string.char(i + string.byte("0") - 1)
+ -- end
+ -- end
+ else
+ yrs[#yrs+1] = year
+ end
+ end
+ done[author] = yrs
+ end
+ return done
+end
+
+local method, settings = "normal", { }
+
+function authors.setsettings(s)
+ settings = s or settings
+end
+
+if commands then
+
+ local sessions = { }
+
+ function commands.definebibtexsession(name)
+ sessions[name] = bibtex.new()
+ end
+
+ function commands.preparebibtexsession(name,xmlname,options)
+ bibtex.toxml(sessions[name],options)
+ lxml.register(xmlname,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 } -- here we can keep more info
+ else
+ entries[entry] = true
+ end
+ end
+
+ -- commands.bibtexconcat = bibtexconcat
+
+ -- finalizers can be rather dumb as we have just text and no embedded xml
+
+ function finalizers.bibtexconcat(collected,method,what)
+ if collected then
+ local author = collected[1].dt[1] or ""
+ if author ~= "" then
+ context(authors.concat(author,method,what,settings))
+ end
+ end
+ end
+
+ function finalizers.bibtexshort(collected)
+ if collected then
+ local c = collected[1]
+ local year = xmlfilter(c,"xml://field[@name='year']/text()")
+ local author = xmlfilter(c,"xml://field[@name='author']/text()")
+ context(authors.short(author,year))
+ end
+ end
+
+ -- experiment:
+
+ --~ -- alternative approach: keep data at the tex end
+
+ --~ local function xbibtexconcat(t,sep,finalsep,lastsep)
+ --~ local n = #t
+ --~ if n > 0 then
+ --~ context(t[1])
+ --~ if n > 1 then
+ --~ if n > 2 then
+ --~ for i=2,n-1 do
+ --~ context.bibtexpublicationsparameter("sep")
+ --~ context(t[i])
+ --~ end
+ --~ context.bibtexpublicationsparameter("finalsep")
+ --~ else
+ --~ context.bibtexpublicationsparameter("lastsep")
+ --~ end
+ --~ context(t[n])
+ --~ end
+ --~ end
+ --~ end
+
+ -- todo : sort
+
+ -- todo: choose between bibtex or commands namespace
+
+ function bibtex.authorref(id,list)
+ local result = collectauthoryears(id,list,method,what)
+ for author, years in next, result do
+ context(authors.concat(author,method,what,settings))
+ end
+ end
+
+ function bibtex.authoryearref(id,list)
+ local result = collectauthoryears(id,list,method,what)
+ for author, years in next, result do
+ context("%s (%s)",authors.concat(author,method,what,settings),concat(years,", "))
+ end
+ end
+
+ function bibtex.authoryearsref(id,list)
+ local result = collectauthoryears(id,list,method,what)
+ for author, years in next, result do
+ context("(%s, %s)",authors.concat(author,method,what,settings),concat(years,", "))
+ end
+ end
+
+ function bibtex.singularorplural(singular,plural)
+ if lastconcatsize and lastconcatsize > 1 then
+ context(plural)
+ else
+ context(singular)
+ end
+ end
+
+end
+
+
+--~ local function test(sample)
+--~ local authors = splitauthors(sample)
+--~ print(table.serialize(authors))
+--~ for i=1,#authors do
+--~ local author = authors[i]
+--~ print(normalauthor (author,settings))
+--~ print(normalshortauthor (author,settings))
+--~ print(invertedauthor (author,settings))
+--~ print(invertedshortauthor(author,settings))
+--~ end
+--~ print(concatauthors(sample,settings,normalauthor))
+--~ print(concatauthors(sample,settings,normalshortauthor))
+--~ print(concatauthors(sample,settings,invertedauthor))
+--~ print(concatauthors(sample,settings,invertedshortauthor))
+--~ end
+
+--~ local sample_a = "Hagen, Hans and Hoekwater, Taco Whoever T. Ex. and Henkel Hut, Hartmut Harald von der"
+--~ local sample_b = "Hans Hagen and Taco Whoever T. Ex. Hoekwater and Hartmut Harald von der Henkel Hut"
+
+--~ test(sample_a)
+--~ test(sample_b)
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