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- --[==========================================================================[
- simplexml.lua: Lua simple xml parser wrapper
- --[==========================================================================[
- Copyright (C) 2010 Antoine Cellerier
- $Id$
-
- Authors: Antoine Cellerier <dionoea at videolan dot org>
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- --]==========================================================================]
-
- module("simplexml",package.seeall)
-
- --[[ Returns the xml tree structure
- -- Each node is of one of the following types:
- -- { name (string), attributes (key->value map), children (node array) }
- -- text content (string)
- --]]
-
- local function parsexml(stream, errormsg)
- if not stream then return nil, errormsg end
- local xml = vlc.xml()
- local reader = xml:create_reader(stream)
-
- local tree
- local parents = {}
- while reader:read() > 0 do
- local nodetype = reader:node_type()
- --print(nodetype, reader:name())
- if nodetype == 'startelem' then
- local name = reader:name()
- local node = { name= '', attributes= {}, children= {} }
- node.name = name
- while reader:next_attr() == 0 do
- node.attributes[reader:name()] = reader:value()
- end
- if tree then
- table.insert(tree.children, node)
- table.insert(parents, tree)
- end
- tree = node
- elseif nodetype == 'endelem' then
- if #parents > 0 then
- local name = reader:name()
- local tmp = {}
- --print(name, tree.name, #parents)
- while name ~= tree.name do
- if #parents == 0 then
- error("XML parser error/faulty logic")
- end
- local child = tree
- tree = parents[#parents]
- table.remove(parents)
- table.remove(tree.children)
- table.insert(tmp, 1, child)
- for i, node in pairs(child.children) do
- table.insert(tmp, i+1, node)
- end
- child.children = {}
- end
- for _, node in pairs(tmp) do
- table.insert(tree.children, node)
- end
- tree = parents[#parents]
- table.remove(parents)
- end
- elseif nodetype == 'text' then
- table.insert(tree.children, reader:value())
- end
- end
-
- if #parents > 0 then
- error("XML parser error/Missing closing tags")
- end
- return tree
- end
-
- function parse_url(url)
- return parsexml(vlc.stream(url))
- end
-
- function parse_string(str)
- return parsexml(vlc.memory_stream(str))
- end
-
- function add_name_maps(tree)
- tree.children_map = {}
- for _, node in pairs(tree.children) do
- if type(node) == "table" then
- if not tree.children_map[node.name] then
- tree.children_map[node.name] = {}
- end
- table.insert(tree.children_map[node.name], node)
- add_name_maps(node)
- end
- end
- end
-