219 lines
6.1 KiB
Lua
219 lines
6.1 KiB
Lua
--[=====================================================================[
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v0.5.1 Copyright © 2013 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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local SLAXML = {
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VERSION = "0.5.1",
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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)
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print(string.format("<%s%s>",name,nsURI and (" ("..nsURI..")") or ""))
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end,
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attribute = function(name,value,nsURI)
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print(string.format(" %s=%q%s",name,value,nsURI and (" ("..nsURI..")") or ""))
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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)
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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,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 = string.find, string.sub, string.gsub, string.char, table.insert, table.remove
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local first, last, match1, match2, match3, pos2, nsURI
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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
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local nsStack = {}
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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 char(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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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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first, last, match1 = find( xml, '^<([%a_][%w_.-]*)', pos )
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if first then
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currentElement[2] = nil
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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[2] = nsForPrefix(match1)
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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[3] = nsForPrefix(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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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 self._call.attribute(unpack(currentAttributes[i])) end 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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error("Was in an element and couldn't find attributes or the close.")
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end
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end
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end
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end
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end
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return SLAXML |