Jacob
305 lines
9.9 KiB
Lua
305 lines
9.9 KiB
Lua
-- Optional parser that creates a flat DOM from parsing
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--[=====================================================================[
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v0.7 Copyright © 2013-2014 Gavin Kistner <!@phrogz.net>; MIT Licensed
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See http://github.com/Phrogz/SLAXML for details.
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--]=====================================================================]
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SLAXML = {
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VERSION = "0.7",
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_call = {
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pi = function(target,content)
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print(string.format("<?%s %s?>",target,content))
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end,
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comment = function(content)
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print(string.format("<!-- %s -->",content))
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end,
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startElement = function(name,nsURI,nsPrefix)
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io.write("<")
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if nsPrefix then io.write(nsPrefix,":") end
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io.write(name)
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if nsURI then io.write(" (ns='",nsURI,"')") end
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print(">")
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end,
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attribute = function(name,value,nsURI,nsPrefix)
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io.write(' ')
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if nsPrefix then io.write(nsPrefix,":") end
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io.write(name,'=',string.format('%q',value))
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if nsURI then io.write(" (ns='",nsURI,"')") end
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io.write("\n")
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end,
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text = function(text)
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print(string.format(" text: %q",text))
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end,
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closeElement = function(name,nsURI,nsPrefix)
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print(string.format("</%s>",name))
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end,
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}
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}
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function SLAXML:parser(callbacks)
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return { _call=callbacks or self._call, parse=SLAXML.parse }
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end
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function SLAXML:parse(xml, fileName, options)
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if not options then options = { stripWhitespace=false } end
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-- Cache references for maximum speed
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local find, sub, gsub, char, push, pop, concat = string.find, string.sub, string.gsub, string.char, table.insert, table.remove, table.concat
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local first, last, match1, match2, match3, pos2, nsURI
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local unpack = unpack or table.unpack
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local pos = 1
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local state = "text"
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local textStart = 1
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local currentElement={}
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local currentAttributes={}
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local currentAttributeCt -- manually track length since the table is re-used
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local nsStack = {}
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local anyElement = false
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local utf8markers = { {0x7FF,192}, {0xFFFF,224}, {0x1FFFFF,240} }
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local function utf8(decimal) -- convert unicode code point to utf-8 encoded character string
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if decimal<128 then return char(decimal) end
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local charbytes = {}
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for bytes,vals in ipairs(utf8markers) do
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if decimal<=vals[1] then
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for b=bytes+1,2,-1 do
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local mod = decimal%64
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decimal = (decimal-mod)/64
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charbytes[b] = char(128+mod)
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end
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charbytes[1] = char(vals[2]+decimal)
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return concat(charbytes)
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end
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end
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end
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local entityMap = { ["lt"]="<", ["gt"]=">", ["amp"]="&", ["quot"]='"', ["apos"]="'" }
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local entitySwap = function(orig,n,s) return entityMap[s] or n=="#" and utf8(tonumber('0'..s)) or orig end
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local function unescape(str) return gsub( str, '(&(#?)([%d%a]+);)', entitySwap ) end
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local function finishText()
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if first>textStart and self._call.text then
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local text = sub(xml,textStart,first-1)
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if options.stripWhitespace then
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text = gsub(text,'^%s+','')
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text = gsub(text,'%s+$','')
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if #text==0 then text=nil end
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end
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if text then self._call.text(unescape(text)) end
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end
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end
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local function findPI()
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first, last, match1, match2 = find( xml, '^<%?([:%a_][:%w_.-]*) ?(.-)%?>', pos )
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if first then
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finishText()
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if self._call.pi then self._call.pi(match1,match2) end
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pos = last+1
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textStart = pos
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return true
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end
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end
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local function findComment()
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first, last, match1 = find( xml, '^<!%-%-(.-)%-%->', pos )
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if first then
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finishText()
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if self._call.comment then self._call.comment(match1) end
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pos = last+1
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textStart = pos
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return true
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end
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end
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local function nsForPrefix(prefix)
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if prefix=='xml' then return 'http://www.w3.org/XML/1998/namespace' end -- http://www.w3.org/TR/xml-names/#ns-decl
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for i=#nsStack,1,-1 do if nsStack[i][prefix] then return nsStack[i][prefix] end end
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error(("Cannot find namespace for prefix %s"):format(prefix))
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end
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local function startElement()
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anyElement = true
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first, last, match1 = find( xml, '^<([%a_][%w_.-]*)', pos )
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if first then
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currentElement[2] = nil -- reset the nsURI, since this table is re-used
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currentElement[3] = nil -- reset the nsPrefix, since this table is re-used
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finishText()
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pos = last+1
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first,last,match2 = find(xml, '^:([%a_][%w_.-]*)', pos )
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if first then
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currentElement[1] = match2
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currentElement[3] = match1 -- Save the prefix for later resolution
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match1 = match2
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pos = last+1
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else
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currentElement[1] = match1
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for i=#nsStack,1,-1 do if nsStack[i]['!'] then currentElement[2] = nsStack[i]['!']; break end end
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end
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currentAttributeCt = 0
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push(nsStack,{})
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return true
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end
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end
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local function findAttribute()
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first, last, match1 = find( xml, '^%s+([:%a_][:%w_.-]*)%s*=%s*', pos )
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if first then
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pos2 = last+1
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first, last, match2 = find( xml, '^"([^<"]*)"', pos2 ) -- FIXME: disallow non-entity ampersands
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if first then
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pos = last+1
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match2 = unescape(match2)
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else
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first, last, match2 = find( xml, "^'([^<']*)'", pos2 ) -- FIXME: disallow non-entity ampersands
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if first then
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pos = last+1
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match2 = unescape(match2)
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end
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end
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end
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if match1 and match2 then
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local currentAttribute = {match1,match2}
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local prefix,name = string.match(match1,'^([^:]+):([^:]+)$')
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if prefix then
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if prefix=='xmlns' then
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nsStack[#nsStack][name] = match2
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else
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currentAttribute[1] = name
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currentAttribute[4] = prefix
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end
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else
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if match1=='xmlns' then
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nsStack[#nsStack]['!'] = match2
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currentElement[2] = match2
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end
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end
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currentAttributeCt = currentAttributeCt + 1
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currentAttributes[currentAttributeCt] = currentAttribute
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return true
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end
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end
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local function findCDATA()
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first, last, match1 = find( xml, '^<!%[CDATA%[(.-)%]%]>', pos )
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if first then
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finishText()
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if self._call.text then self._call.text(match1) end
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pos = last+1
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textStart = pos
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return true
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end
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end
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local function closeElement()
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first, last, match1 = find( xml, '^%s*(/?)>', pos )
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if first then
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state = "text"
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pos = last+1
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textStart = pos
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-- Resolve namespace prefixes AFTER all new/redefined prefixes have been parsed
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if currentElement[3] then currentElement[2] = nsForPrefix(currentElement[3]) end
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if self._call.startElement then self._call.startElement(unpack(currentElement)) end
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if self._call.attribute then
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for i=1,currentAttributeCt do
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if currentAttributes[i][4] then currentAttributes[i][3] = nsForPrefix(currentAttributes[i][4]) end
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self._call.attribute(unpack(currentAttributes[i]))
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end
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end
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if match1=="/" then
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pop(nsStack)
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if self._call.closeElement then self._call.closeElement(unpack(currentElement)) end
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end
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return true
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end
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end
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local function findElementClose()
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first, last, match1, match2 = find( xml, '^</([%a_][%w_.-]*)%s*>', pos )
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if first then
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nsURI = nil
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for i=#nsStack,1,-1 do if nsStack[i]['!'] then nsURI = nsStack[i]['!']; break end end
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else
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first, last, match2, match1 = find( xml, '^</([%a_][%w_.-]*):([%a_][%w_.-]*)%s*>', pos )
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if first then nsURI = nsForPrefix(match2) end
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end
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if first then
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finishText()
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if self._call.closeElement then self._call.closeElement(match1,nsURI) end
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pos = last+1
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textStart = pos
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pop(nsStack)
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return true
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end
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end
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while pos<#xml do
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if state=="text" then
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if not (findPI() or findComment() or findCDATA() or findElementClose()) then
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if startElement() then
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state = "attributes"
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else
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first, last = find( xml, '^[^<]+', pos )
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pos = (first and last or pos) + 1
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end
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end
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elseif state=="attributes" then
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if not findAttribute() then
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if not closeElement() then
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print("\n[ERROR] " .. fileName .. " is broken! Please put in online validator and fix!\n")
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break
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end
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end
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end
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end
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-- if not anyElement then error("Parsing did not discover any elements") end
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-- if #nsStack > 0 then print("Parsing could not find closing to attribute. Please put in online validator and fix!\nTo figure out what Pattern/VCF is broken look at the last loaded, the one after that is broken.\n\n") end
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end
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function SLAXML:dom(xml, filename, opts)
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if not opts then opts={} end
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local rich = not opts.simple
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local push, pop = table.insert, table.remove
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local stack = {}
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local doc = { type="document", name="#doc", kids={} }
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local current = doc
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local builder = SLAXML:parser{
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startElement = function(name,nsURI)
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local el = { type="element", name=name, kids={}, el=rich and {} or nil, attr={}, nsURI=nsURI, parent=rich and current or nil }
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if current==doc then
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if doc.root then error(("Encountered element '%s' when the document already has a root '%s' element"):format(name,doc.root.name)) end
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doc.root = el
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end
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push(current.kids,el)
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if current.el then push(current.el,el) end
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current = el
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push(stack,el)
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end,
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attribute = function(name,value,nsURI)
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if not current or current.type~="element" then error(("Encountered an attribute %s=%s but I wasn't inside an element"):format(name,value)) end
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local attr = {type='attribute',name=name,nsURI=nsURI,value=value,parent=rich and current or nil}
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if rich then current.attr[name] = value end
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push(current.attr,attr)
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end,
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closeElement = function(name)
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if current.name~=name or current.type~="element" then error(("Received a close element notification for '%s' but was inside a '%s' %s"):format(name,current.name,current.type)) end
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pop(stack)
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current = stack[#stack]
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end,
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text = function(value)
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if current.type~='document' then
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if current.type~="element" then error(("Received a text notification '%s' but was inside a %s"):format(value,current.type)) end
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push(current.kids,{type='text',name='#text',value=value,parent=rich and current or nil})
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end
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end,
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comment = function(value)
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push(current.kids,{type='comment',name='#comment',value=value,parent=rich and current or nil})
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end,
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pi = function(name,value)
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push(current.kids,{type='pi',name=name,value=value,parent=rich and current or nil})
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end
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}
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builder:parse(xml, filename, opts)
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return doc
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end
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return SLAXML |