| --- |
| -- A custom Dom handler for HTML files |
| -- |
| -- |
| -- Features: |
| -- ========= |
| -- domHandler - Generate DOM-like node tree |
| -- |
| -- API: |
| -- ==== |
| -- Must be called as handler function from xmlParser |
| -- and implement XML event callbacks (see xmlParser.lua |
| -- for callback API definition) |
| -- |
| -- 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 = <Element Name>, |
| -- _type = ROOT|ELEMENT|TEXT|COMMENT|PI|DECL|DTD, |
| -- _attr = { Node attributes - see callback API }, |
| -- _parent = <Parent Node> |
| -- _children = { List of child nodes - ROOT/NODE only } |
| -- } |
| -- |
| -- The dom structure is capable of representing any valid XML document |
| -- |
| -- |
| -- |
| -- Options |
| -- ======= |
| -- 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. |
| -- |
| -- License: |
| -- ======== |
| -- |
| -- This code is freely distributable under the terms of the Lua license |
| -- (<a href="http://www.lua.org/copyright.html">http://www.lua.org/copyright.html</a>) |
| -- |
| -- History |
| -- ======= |
| -- Renamed domhandler.lua from handler.lua and cleaning all the others handlefunction to leave only the DOM one. |
| -- |
| -- $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)<p/> |
| --@module domhandler |
| |
| local M = {} |
| |
| local function heavytrim(string) |
| repeat |
| string = string:gsub("^%s*(.-)%s*$","%1") |
| string = string:gsub("^\\n*(.-)\\n*$","%1") |
| |
| local find = string:find("^(%s+).-(%s+)$") |
| find = find or string:find("^(\\n+).-(\\n+)$") |
| until find == nil |
| |
| return string |
| end |
| |
| --- domHandler |
| function M.createhandler() |
| local obj = {} |
| obj.options = {commentNode=1,piNode=1,dtdNode=1,declNode=1} |
| obj.root = { _children = {n=0}, _type = "ROOT" } |
| obj.current = obj.root |
| obj.starttag = function(self,t,a) |
| local node = { _type = 'ELEMENT', |
| _name = t, |
| _attr = a, |
| _parent = self.current, |
| _children = {n=0} } |
| table.insert(self.current._children,node) |
| self.current = node |
| end |
| obj.endtag = function(self,t,s) |
| if t ~= self.current._name then |
| --error("XML Error - Unmatched Tag ["..s..":"..t.."]\n") |
| end |
| self.current = self.current._parent |
| end |
| obj.text = function(self,t) |
| if (self.current._name ~= "pre") then |
| t = heavytrim(t) |
| end |
| if (t ~= "") then |
| local node = { _type = "TEXT", |
| _parent = self.current, |
| _text = t } |
| table.insert(self.current._children,node) |
| end |
| 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 = obj.text |
| return obj |
| end |
| |
| return M |
| |
