diff options
Diffstat (limited to 'tex/context/base/lxml-xml.lua')
| -rw-r--r-- | tex/context/base/lxml-xml.lua | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/tex/context/base/lxml-xml.lua b/tex/context/base/lxml-xml.lua new file mode 100644 index 000000000..f791ec0f8 --- /dev/null +++ b/tex/context/base/lxml-xml.lua @@ -0,0 +1,288 @@ +if not modules then modules = { } end modules ['lxml-xml'] = { + 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" +} + +local finalizers = xml.finalizers.xml +local xmlfilter = xml.filter -- we could inline this one for speed +local xmltostring = xml.tostring +local xmlserialize = xml.serialize + +local function first(collected) -- wrong ? + return collected and collected[1] +end + +local function last(collected) + return collected and collected[#collected] +end + +local function all(collected) + return collected +end + +local function reverse(collected) + if collected then + local reversed = { } + for c=#collected,1,-1 do + reversed[#reversed+1] = collected[c] + end + return reversed + end +end + +local function attribute(collected,name) + if collected and #collected > 0 then + local at = collected[1].at + return at and at[name] + end +end + +local function att(id,name) + local at = id.at + return at and at[name] +end + +local function count(collected) + return (collected and #collected) or 0 +end + +local function position(collected,n) + if collected then + n = tonumber(n) or 0 + if n < 0 then + return collected[#collected + n + 1] + elseif n > 0 then + return collected[n] + else + return collected[1].mi or 0 + end + end +end + +local function match(collected) + return (collected and collected[1].mi) or 0 -- match +end + +local function index(collected) + if collected then + return collected[1].ni + end +end + +local function attributes(collected,arguments) + if collected then + local at = collected[1].at + if arguments then + return at[arguments] + elseif next(at) then + return at -- all of them + end + end +end + +local function chainattribute(collected,arguments) -- todo: optional levels + if collected then + local e = collected[1] + while e do + local at = e.at + if at then + local a = at[arguments] + if a then + return a + end + else + break -- error + end + e = e.__p__ + end + end + return "" +end + +local function raw(collected) -- hybrid + if collected then + local e = collected[1] or collected + return (e and xmlserialize(e)) or "" -- only first as we cannot concat function + else + return "" + end +end + +local function text(collected) -- hybrid + if collected then + local e = collected[1] or collected + return (e and xmltostring(e.dt)) or "" + else + return "" + end +end + +local function texts(collected) + if collected then + local t = { } + for c=1,#collected do + local e = collection[c] + if e and e.dt then + t[#t+1] = e.dt + end + end + return t + end +end + +local function tag(collected,n) + if collected then + local c + if n == 0 or not n then + c = collected[1] + elseif n > 1 then + c = collected[n] + else + c = collected[#collected-n+1] + end + return c and c.tg + end +end + +local function name(collected,n) + if collected then + local c + if n == 0 or not n then + c = collected[1] + elseif n > 1 then + c = collected[n] + else + c = collected[#collected-n+1] + end + if c then + if c.ns == "" then + return c.tg + else + return c.ns .. ":" .. c.tg + end + end + end +end + +local function tags(collected,nonamespace) + if collected then + local t = { } + for c=1,#collected do + local e = collected[c] + local ns, tg = e.ns, e.tg + if nonamespace or ns == "" then + t[#t+1] = tg + else + t[#t+1] = ns .. ":" .. tg + end + end + return t + end +end + +local function empty(collected) + if collected then + for c=1,#collected do + local e = collected[c] + if e then + local edt = e.dt + if edt then + local n = #edt + if n == 1 then + local edk = edt[1] + local typ = type(edk) + if typ == "table" then + return false + elseif edk ~= "" then -- maybe an extra tester for spacing only + return false + end + elseif n > 1 then + return false + end + end + end + end + end + return true +end + +finalizers.first = first +finalizers.last = last +finalizers.all = all +finalizers.reverse = reverse +finalizers.elements = all +finalizers.default = all +finalizers.attribute = attribute +finalizers.att = att +finalizers.count = count +finalizers.position = position +finalizers.match = match +finalizers.index = index +finalizers.attributes = attributes +finalizers.chainattribute = chainattribute +finalizers.text = text +finalizers.texts = texts +finalizers.tag = tag +finalizers.name = name +finalizers.tags = tags +finalizers.empty = empty + +-- shortcuts -- we could support xmlfilter(id,pattern,first) + +function xml.first(id,pattern) + return first(xmlfilter(id,pattern)) +end + +function xml.last(id,pattern) + return last(xmlfilter(id,pattern)) +end + +function xml.count(id,pattern) + return count(xmlfilter(id,pattern)) +end + +function xml.attribute(id,pattern,a,default) + return attribute(xmlfilter(id,pattern),a,default) +end + +function xml.raw(id,pattern) + if pattern then + return raw(xmlfilter(id,pattern)) + else + return raw(id) + end +end + +function xml.text(id,pattern) + if pattern then + -- return text(xmlfilter(id,pattern)) + local collected = xmlfilter(id,pattern) + return (collected and xmltostring(collected[1].dt)) or "" + elseif id then + -- return text(id) + return xmltostring(id.dt) or "" + else + return "" + end +end + +xml.content = text + +function xml.position(id,pattern,n) -- element + return position(xmlfilter(id,pattern),n) +end + +function xml.match(id,pattern) -- number + return match(xmlfilter(id,pattern)) +end + +function xml.empty(id,pattern) + return empty(xmlfilter(id,pattern)) +end + +xml.all = xml.filter +xml.index = xml.position +xml.found = xml.filter |