--..module(...,package.seeall) -- -- Overview: -- ========= -- Standard XML event handler(s) for XML parser module (xml.lua) -- -- Features: -- ========= -- printHandler - Generate XML event trace -- domHandler - Generate DOM-like node tree -- simpleTreeHandler - Generate 'simple' node tree -- simpleTeXhandler - SAX like handler with support for CSS selectros -- -- API: -- ==== -- Must be called as handler function from xmlParser -- and implement XML event callbacks (see xmlParser.lua -- for callback API definition) -- -- printHandler: -- ------------- -- -- printHandler prints event trace for debugging -- -- domHandler: -- ----------- -- -- domHandler generates a DOM-like node tree structure with -- a single ROOT node parent - each node is a table comprising -- fields below. -- -- node = { _name = , -- _type = ROOT|ELEMENT|TEXT|COMMENT|PI|DECL|DTD, -- _attr = { Node attributes - see callback API }, -- _parent = -- _children = { List of child nodes - ROOT/NODE only } -- } -- -- The dom structure is capable of representing any valid XML document -- -- simpleTreeHandler -- ----------------- -- -- simpleTreeHandler is a simplified handler which attempts -- to generate a more 'natural' table based structure which -- supports many common XML formats. -- -- The XML tree structure is mapped directly into a recursive -- table structure with node names as keys and child elements -- as either a table of values or directly as a string value -- for text. Where there is only a single child element this -- is inserted as a named key - if there are multiple -- elements these are inserted as a vector (in some cases it -- may be preferable to always insert elements as a vector -- which can be specified on a per element basis in the -- options). Attributes are inserted as a child element with -- a key of '_attr'. -- -- Only Tag/Text & CDATA elements are processed - all others -- are ignored. -- -- This format has some limitations - primarily -- -- * Mixed-Content behaves unpredictably - the relationship -- between text elements and embedded tags is lost and -- multiple levels of mixed content does not work -- * If a leaf element has both a text element and attributes -- then the text must be accessed through a vector (to -- provide a container for the attribute) -- -- In general however this format is relatively useful. -- -- It is much easier to understand by running some test -- data through 'textxml.lua -simpletree' than to read this) -- -- Options -- ======= -- simpleTreeHandler.options.noReduce = { = bool,.. } -- -- - Nodes not to reduce children vector even if only -- one child -- -- domHandler.options.(comment|pi|dtd|decl)Node = bool -- -- - Include/exclude given node types -- -- Usage -- ===== -- Pased as delegate in xmlParser constructor and called -- as callback by xmlParser:parse(xml) method. -- -- See textxml.lua for examples -- License: -- ======== -- -- This code is freely distributable under the terms of the Lua license -- (http://www.lua.org/copyright.html) -- -- History -- ======= -- $Id: handler.lua,v 1.1.1.1 2001/11/28 06:11:33 paulc Exp $ -- -- $Log: handler.lua,v $ -- Revision 1.1.1.1 2001/11/28 06:11:33 paulc -- Initial Import --@author Paul Chakravarti (paulc@passtheaardvark.com)

---Handler to generate a string prepresentation of a table --Convenience function for printHandler (Does not support recursive tables). --@param t Table to be parsed --@returns Returns a string representation of table local M = {} local stack = require("luaxml-stack") local entities = require("luaxml-entities") local function showTable(t) local sep = '' local res = '' if type(t) ~= 'table' then return t end for k,v in pairs(t) do if type(v) == 'table' then v = showTable(v) end res = res .. sep .. string.format("%s=%s",k,v) sep = ',' end res = '{'..res..'}' return res end M.showTable = showTable ---Handler to generate a simple event trace local printHandler = function() local obj = {} obj.starttag = function(self,t,a,s,e) io.write("Start : "..t.."\n") if a then for k,v in pairs(a) do io.write(string.format(" + %s='%s'\n",k,v)) end end end obj.endtag = function(self,t,s,e) io.write("End : "..t.."\n") end obj.text = function(self,t,s,e) io.write("Text : "..t.."\n") end obj.cdata = function(self,t,s,e) io.write("CDATA : "..t.."\n") end obj.comment = function(self,t,s,e) io.write("Comment : "..t.."\n") end obj.dtd = function(self,t,a,s,e) io.write("DTD : "..t.."\n") if a then for k,v in pairs(a) do io.write(string.format(" + %s='%s'\n",k,v)) end end end obj.pi = function(self,t,a,s,e) io.write("PI : "..t.."\n") if a then for k,v in pairs(a) do io. write(string.format(" + %s='%s'\n",k,v)) end end end obj.decl = function(self,t,a,s,e) io.write("XML Decl : "..t.."\n") if a then for k,v in pairs(a) do io.write(string.format(" + %s='%s'\n",k,v)) end end end return obj end M.printHandler = printHandler ---Handler to generate a lua table from a XML content string local function simpleTreeHandler() local obj = {} obj.root = {} obj.stack = {obj.root;n=1} obj.options = {noreduce = {}} obj.reduce = function(self,node,key,parent) -- Recursively remove redundant vectors for nodes -- with single child elements for k,v in pairs(node) do if type(v) == 'table' then self:reduce(v,k,node) end end if #node == 1 and not self.options.noreduce[key] and node._attr == nil then parent[key] = node[1] else node.n = nil end end obj.starttag = function(self,t,a) local node = {} if self.parseAttributes == true then node._attr=a end local current = self.stack[#self.stack] if current[t] then table.insert(current[t],node) else current[t] = {node;n=1} end table.insert(self.stack,node) end obj.endtag = function(self,t,s) local current = self.stack[#self.stack] local prev = self.stack[#self.stack-1] if not prev[t] then error("XML Error - Unmatched Tag ["..s..":"..t.."]\n") end if prev == self.root then -- Once parsing complete recursively reduce tree self:reduce(prev,nil,nil) end table.remove(self.stack) end obj.text = function(self,t) local current = self.stack[#self.stack] table.insert(current,t) end obj.cdata = obj.text return obj end M.simpleTreeHandler = simpleTreeHandler --- domHandler local function domHandler() local obj = {} local decode = entities.decode obj.options = {commentNode=1,piNode=1,dtdNode=1,declNode=1, voidElements = {}} obj.root = { _children = {n=0}, _type = "ROOT" } obj.current = obj.root obj.starttag = function(self,t,a) local newattr if a then newattr = {} for k,v in pairs(a) do newattr[k] = decode(v) end end local node = { _type = 'ELEMENT', _name = t, _attr = newattr, _parent = self.current, _children = {n=0} } table.insert(self.current._children,node) -- close void element if not self.options.voidElements[t] then self.current = node else table.remove(self._xml._stack) end end obj.endtag = function(self,t,s) if not self.options.voidElements[t] then if t ~= self.current._name then error("XML Error - Unmatched Tag ["..s..":"..t.."]\n") end self.current = self.current._parent end end obj.text = function(self,t) local text = decode(t) local node = { _type = "TEXT", _parent = self.current, _text = text } table.insert(self.current._children,node) end obj.comment = function(self,t) if self.options.commentNode then local node = { _type = "COMMENT", _parent = self.current, _text = t } table.insert(self.current._children,node) end end obj.pi = function(self,t,a) if self.options.piNode then local node = { _type = "PI", _name = t, _attr = a, _parent = self.current } table.insert(self.current._children,node) end end obj.decl = function(self,t,a) if self.options.declNode then local node = { _type = "DECL", _name = t, _attr = a, _parent = self.current } table.insert(self.current._children,node) end end obj.dtd = function(self,t,a) if self.options.dtdNode then local node = { _type = "DTD", _name = t, _attr = a, _parent = self.current } table.insert(self.current._children,node) end end obj.cdata = function(self,t) local node = { _type = "CDATA", _parent = self.current, _text = decode(t) } table.insert(self.current._children,node) end return obj end M.domHandler = domHandler -- local simpleTeXhandler=function() local obj={} local _stack=stack.Stack:Create() obj.starttag = function(self,t,a,s,e) local tag = {t} local getAtt = function(att) if a[att] then return att.."="..a[att] end return nil end if type(a) == "table" then table.insert(tag,getAtt("id")) table.insert(tag,getAtt("class")) end _stack:push("<"..table.concat(tag," ")..">") io.write(_stack:join("").."\n") -- io.write("Start "..t.."\n" ) end obj.endtag = function(self,t,s,e) _stack:pop() -- io.write("End : "..t.."\n") end return obj end M.simpleTeXhandler = simpleTeXhandler return M