Lua

XML Sort by Content

See more XML Examples

Demonstrates the SortByContent method.

The input XML, available at http://www.chilkatsoft.com/data/fruitSort2.xml, is this:

<root>
    <fruits>
        <apples>
            <apple>fuji</apple>
            <apple>gala</apple>
            <apple>granny smith</apple>
            <apple>honeycrisp</apple>
            <apple>mcintosh</apple>
        </apples>
        <fruit>banana</fruit>
        <fruit>blackberry</fruit>
        <fruit>blueberry</fruit>
        <fruit>orange</fruit>
        <fruit>pear</fruit>
    </fruits>
</root>

Lua

local chilkat = require("chilkat")

local xml = chilkat.Xml.new()

-- The sample input XML is available at http://www.chilkatsoft.com/data/fruitSort2.xml
local success = xml:load_xml_file("fruitSort2.xml")
if not success then
    print(xml.last_error_text)
    return
end

-- Sort the direct children under the "fruits" node by tag:
local xSortRoot = xml:find_child("fruits")

-- Sort in ascending order.
local bAscending = true
xSortRoot:sort_by_content(bAscending)

-- Show the result:
print(xml:get_xml())

-- Note:  The "apples" node contains child nodes, but its
-- text content is 0-length (empty).  Therefore, when sorting in
-- ascending order, it will be positioned before the direct
-- children containing non-empty content.

-- <root>
--     <fruits>
--         <apples>
--             <apple>granny smith</apple>
--             <apple>gala</apple>
--             <apple>fuji</apple>
--             <apple>mcintosh</apple>
--             <apple>honeycrisp</apple>
--         </apples>
--         <fruit>banana</fruit>
--         <fruit>blackberry</fruit>
--         <fruit>blueberry</fruit>
--         <fruit>orange</fruit>
--         <fruit>pear</fruit>
--     </fruits>
-- </root>

-- Sort the direct children under the "apples" node:
success = xSortRoot:find_child2("apples")

xSortRoot:sort_by_content(bAscending)
print(xml:get_xml())

-- <root>
--     <fruits>
--         <apples>
--             <apple>fuji</apple>
--             <apple>gala</apple>
--             <apple>granny smith</apple>
--             <apple>honeycrisp</apple>
--             <apple>mcintosh</apple>
--         </apples>
--         <fruit>banana</fruit>
--         <fruit>blackberry</fruit>
--         <fruit>blueberry</fruit>
--         <fruit>orange</fruit>
--         <fruit>pear</fruit>
--     </fruits>
-- </root>