CODEWITHSUNDEEP
pugixml
magras
magras

Reputation: 1741

Preserve empty text tags with pugixml

I'm trying to use pugixml to modify xml configuration, created through boost::serialization and used by other application so i need to change only few fragments of document and leave all other parts the same.

Some nodes may store empty strings in the form of <value></value>. After load & save (with pugi) this nodes changes into <value />. After this boost::serialization cannot parse such file.

Load options parse_ws_pcdata_single and parse_ws_pcdata works only if there is white space between.

I didn't found saving option for saving empty nodes in form <value></value> too.

Is there any way to preserve opening & closing tags with zero text between?

Upvotes: 3

Views: 1232

Answers (3)

user1552175
user1552175

Reputation: 178

If someone still comes across this question, you don't need to change the source. Simply use this flag when writing your tree:

pugi::format_no_empty_element_tags

See the docs in https://pugixml.org/docs/manual.html#saving.options

Upvotes: 1

aquawicket
aquawicket

Reputation: 584

Pugixml has been updated and the answer to this has changed

This is for Pugixml version 1.6

To generate closing tags for all nodes,

modify pugixml.cpp: line 3503

from

PUGI__FN bool node_output_start(xml_buffered_writer& writer, xml_node_struct* node, unsigned int flags)

to

PUGI__FN void node_output_end(xml_buffered_writer& writer, xml_node_struct* node);
PUGI__FN bool node_output_start(xml_buffered_writer& writer, xml_node_struct* node, unsigned int flags)

modify pugixml.cpp: line 3516

from

writer.write(' ', '/', '>');

to

writer.write('>');
node_output_end(writer, node);

Upvotes: 2

zeuxcg
zeuxcg

Reputation: 9404

There is no readily available option.

It is easy to change pugixml to output the XML that you need (probably easier than fixing boost::serialization...):

in pugixml.cpp around line 3249, there's this code:

        else if (!node.first_child())
            writer.write(' ', '/', '>', '\n');

Just remove these two lines if you're using indented formatting (if you're using format_raw there's similar code slightly above).

Upvotes: 2

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