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|
-- module(..., package.seeall)
---------------------------------------------------------------------------------
---------------------------------------------------------------------------------
--
-- xml.lua - XML parser for use with the Corona SDK.
--
-- version: 1.2
--
-- CHANGELOG:
--
-- 1.2 - Created new structure for returned table
-- 1.1 - Fixed base directory issue with the loadFile() function.
--
-- NOTE: This is a modified version of Alexander Makeev's Lua-only XML parser
-- found here: http://lua-users.org/wiki/LuaXml
--
---------------------------------------------------------------------------------
---------------------------------------------------------------------------------
function newParser()
XmlParser = {};
function XmlParser:ToXmlString(value)
value = string.gsub(value, "&", "&"); -- '&' -> "&"
value = string.gsub(value, "<", "<"); -- '<' -> "<"
value = string.gsub(value, ">", ">"); -- '>' -> ">"
value = string.gsub(value, "\"", """); -- '"' -> """
value = string.gsub(value, "([^%w%&%;%p%\t% ])",
function(c)
return string.format("&#x%X;", string.byte(c))
end);
return value;
end
function XmlParser:FromXmlString(value)
value = string.gsub(value, "&#x([%x]+)%;",
function(h)
return string.char(tonumber(h, 16))
end);
value = string.gsub(value, "&#([0-9]+)%;",
function(h)
return string.char(tonumber(h, 10))
end);
value = string.gsub(value, """, "\"");
value = string.gsub(value, "'", "'");
value = string.gsub(value, ">", ">");
value = string.gsub(value, "<", "<");
value = string.gsub(value, "&", "&");
return value;
end
function XmlParser:ParseArgs(node, s)
string.gsub(s, "(%w+)=([\"'])(.-)%2", function(w, _, a)
node:addProperty(w, self:FromXmlString(a))
end)
end
function XmlParser:ParseXmlText(xmlText)
local stack = {}
local top = newNode()
table.insert(stack, top)
local ni, c, label, xarg, empty
local i, j = 1, 1
while true do
ni, j, c, label, xarg, empty = string.find(xmlText, "<(%/?)([%w_:]+)(.-)(%/?)>", i)
if not ni then break end
local text = string.sub(xmlText, i, ni - 1);
if not string.find(text, "^%s*$") then
local lVal = (top:value() or "") .. self:FromXmlString(text)
stack[#stack]:setValue(lVal)
end
if empty == "/" then -- empty element tag
local lNode = newNode(label)
self:ParseArgs(lNode, xarg)
top:addChild(lNode)
elseif c == "" then -- start tag
local lNode = newNode(label)
self:ParseArgs(lNode, xarg)
table.insert(stack, lNode)
top = lNode
else -- end tag
local toclose = table.remove(stack) -- remove top
top = stack[#stack]
if #stack < 1 then
error("XmlParser: nothing to close with " .. label)
end
if toclose:name() ~= label then
error("XmlParser: trying to close " .. toclose.name .. " with " .. label)
end
top:addChild(toclose)
end
i = j + 1
end
local text = string.sub(xmlText, i);
if #stack > 1 then
error("XmlParser: unclosed " .. stack[#stack]:name())
end
return top
end
function XmlParser:loadFile(xmlFilename, base)
if not base then
base = system.ResourceDirectory
end
local path = system.pathForFile(xmlFilename, base)
local hFile, err = io.open(path, "r");
if hFile and not err then
local xmlText = hFile:read("*a"); -- read file content
io.close(hFile);
return self:ParseXmlText(xmlText), nil;
else
print(err)
return nil
end
end
return XmlParser
end
function newNode(name)
local node = {}
node.___value = nil
node.___name = name
node.___children = {}
node.___props = {}
function node:value() return self.___value end
function node:setValue(val) self.___value = val end
function node:name() return self.___name end
function node:setName(name) self.___name = name end
function node:children() return self.___children end
function node:numChildren() return #self.___children end
function node:addChild(child)
if self[child:name()] ~= nil then
if type(self[child:name()].name) == "function" then
local tempTable = {}
table.insert(tempTable, self[child:name()])
self[child:name()] = tempTable
end
table.insert(self[child:name()], child)
else
self[child:name()] = child
end
table.insert(self.___children, child)
end
function node:properties() return self.___props end
function node:numProperties() return #self.___props end
function node:addProperty(name, value)
local lName = "@" .. name
if self[lName] ~= nil then
if type(self[lName]) == "string" then
local tempTable = {}
table.insert(tempTable, self[lName])
self[lName] = tempTable
end
table.insert(self[lName], value)
else
self[lName] = value
end
table.insert(self.___props, { name = name, value = self[name] })
end
return node
end
|
