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tutorial.lua
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executable file
·213 lines (160 loc) · 4.5 KB
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#!/usr/bin/env luajit
-- Requires "xmlua" module
local xmlua = require("xmlua")
local html = [[
<html>
<head>
<title>Hello</title>
</head>
<body>
<p>World</p>
</body>
</html>
]]
-- Parses HTML
local document = xmlua.HTML.parse(html)
-- Serializes to HTML
print(document:to_html())
-- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
-- <html>
-- <head>
-- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
-- <title>Hello</title>
-- </head>
-- <body>
-- <p>World</p>
-- </body>
-- </html>
local xml = [[
<root>
<sub>text1</sub>
<sub>text2</sub>
<sub>text3</sub>
</root>
]]
-- Parses XML
local document = xmlua.XML.parse(xml)
-- Serializes to XML
print(document:to_xml())
-- <?xml version="1.0" encoding="UTF-8"?>
-- <root>
-- <sub>text1</sub>
-- <sub>text2</sub>
-- <sub>text3</sub>
-- </root>
local xmlua = require("xmlua")
local invalid_xml = "<root>"
-- Parses invalid XML
local success, document = pcall(xmlua.XML.parse, invalid_xml)
if success then
print("Succeeded to parse XML")
else
-- If pcall returns not success, the second return value is error
-- message not document.
local message = document
print("Failed to parse XML: " .. message)
-- -> Failed to parse XML: Premature end of data in tag root line 1
end
local xml = [[
<root>
<sub>text1</sub>
<sub>text2</sub>
<sub>text3</sub>
</root>
]]
local document = xmlua.XML.parse(xml)
-- Searches all <sub> elements under the <root> element
local all_subs = document:search("/root/sub")
-- You can use "#" for getting the number of matched nodes
print(#all_subs) -- -> 3
-- You can access the N-th node by "[]".
print(all_subs[1]:to_xml()) -- -> <sub1>text1</sub1>
print(all_subs[2]:to_xml()) -- -> <sub2>text2</sub2>
print(all_subs[3]:to_xml()) -- -> <sub3>text3</sub3>
local xml = [[
<root>
<sub class="A"><subsub1/></sub>
<sub class="B"><subsub2/></sub>
<sub class="A"><subsub3/></sub>
</root>
]]
local document = xmlua.XML.parse(xml)
-- Searches all <sub class="A"> elements
local class_a_subs = document:search("//sub[@class='A']")
-- Searches all elements under <sub class="A"> elements
local subsubs_in_class_a = class_a_subs:search("*")
print(#subsubs_in_class_a) -- -> 2
-- It's /root/sub[@class="A"]/subsub1
print(subsubs_in_class_a[1]:to_xml())
-- <subsub1/>
-- It's /root/sub[@class="A"]/subsub3
print(subsubs_in_class_a[2]:to_xml())
-- <subsub3/>
local xml = [[
<root>
<sub>text1</sub>
<sub>text2</sub>
<sub>text3</sub>
</root>
]]
local document = xmlua.XML.parse(xml)
-- Searches the <root> element
local roots = document:search("/root")
local root = roots[1]
-- Searches all <sub> elements under the <root> element
local all_subs = root:search("sub")
-- You can use "#" for getting the number of matched nodes
print(#all_subs) -- -> 3
-- You can access the N-th node by "[]".
print(all_subs[1]:to_xml()) -- -> <sub1>text1</sub1>
print(all_subs[2]:to_xml()) -- -> <sub2>text2</sub2>
print(all_subs[3]:to_xml()) -- -> <sub3>text3</sub3>
local xml = "<root/>"
local document = xmlua.XML.parse(xml)
local invalid_xpath = "..."
local success, node_set = pcall(function()
return document:search(invalid_xpath)
end)
if success then
print("Succeeded to search by XPath")
else
-- If pcall returns not success, the second return value is error
-- message not node set.
local message = node_set
print("Failed to search by XPath: " .. message)
-- -> Failed to search by XPath: Invalid expression
end
local document = xmlua.XML.parse("<root class='A'/>")
-- Gets the root element: <root>
local root = document:root()
-- Gets the root element: <root>
local root = document:search("/root")[1]
-- Uses dot syntax to get attribute value
print(root.class)
-- -> A
-- Uses [] syntax to get attribute value
print(root["class"])
-- -> A
-- Uses get_attribute method to get attribute value
print(root:get_attribute("class"))
-- -> A
-- Returns nil for nonexistent attribute name
print(root.nonexistent)
-- -> nil
local xml = [[
<root xmlns:example="http://example.com/"
example:attribute="value-example"
attribute="value"
nonexistent-namespace:attribute="value-nonexistent-namespace"/>
]]
local document = xmlua.XML.parse(xml)
local root = document:root()
-- With namespace prefix
print(root["example:attribute"])
-- -> value-example
-- Without namespace prefix
print(root["attribute"])
-- -> value
-- With nonexistent namespace prefix
print(root["nonexistent-namespace:attribute"])
-- -> value-nonexistent-namespace