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Support [NO] INDENT option in XMLSERIALIZE().

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This adds the ability to pretty-print XML documents ... according to
libxml's somewhat idiosyncratic notions of what's pretty, anyway.
One notable divergence from a strict reading of the spec is that
libxml is willing to collapse empty nodes "<node></node>" to just
"<node/>", whereas SQL and the underlying XML spec say that this
option should only result in whitespace tweaks.  Nonetheless,
it seems close enough to justify using the SQL-standard syntax.

Jim Jones, reviewed by Peter Smith and myself

Discussion: https://postgr.es/m/2f5df461-dad8-6d7d-4568-08e10608a69b@uni-muenster.de
This commit is contained in:
Tom Lane
2023-03-15 16:58:59 -04:00
parent 419a8dd814
commit 483bdb2afe
15 changed files with 775 additions and 22 deletions
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36
src/test/regress/sql/xml.sql
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@@ -132,6 +132,42 @@ SELECT xmlserialize(content data as character varying(20)) FROM xmltest;
SELECT xmlserialize(content 'good' as char(10));
SELECT xmlserialize(document 'bad' as text);
-- indent
SELECT xmlserialize(DOCUMENT '<foo><bar><val x="y">42</val></bar></foo>' AS text INDENT);
SELECT xmlserialize(CONTENT '<foo><bar><val x="y">42</val></bar></foo>' AS text INDENT);
-- no indent
SELECT xmlserialize(DOCUMENT '<foo><bar><val x="y">42</val></bar></foo>' AS text NO INDENT);
SELECT xmlserialize(CONTENT '<foo><bar><val x="y">42</val></bar></foo>' AS text NO INDENT);
-- indent non singly-rooted xml
SELECT xmlserialize(DOCUMENT '<foo>73</foo><bar><val x="y">42</val></bar>' AS text INDENT);
SELECT xmlserialize(CONTENT '<foo>73</foo><bar><val x="y">42</val></bar>' AS text INDENT);
-- indent non singly-rooted xml with mixed contents
SELECT xmlserialize(DOCUMENT 'text node<foo>73</foo>text node<bar><val x="y">42</val></bar>' AS text INDENT);
SELECT xmlserialize(CONTENT 'text node<foo>73</foo>text node<bar><val x="y">42</val></bar>' AS text INDENT);
-- indent singly-rooted xml with mixed contents
SELECT xmlserialize(DOCUMENT '<foo><bar><val x="y">42</val><val x="y">text node<val>73</val></val></bar></foo>' AS text INDENT);
SELECT xmlserialize(CONTENT '<foo><bar><val x="y">42</val><val x="y">text node<val>73</val></val></bar></foo>' AS text INDENT);
-- indent empty string
SELECT xmlserialize(DOCUMENT '' AS text INDENT);
SELECT xmlserialize(CONTENT '' AS text INDENT);
-- whitespaces
SELECT xmlserialize(DOCUMENT ' ' AS text INDENT);
SELECT xmlserialize(CONTENT ' ' AS text INDENT);
-- indent null
SELECT xmlserialize(DOCUMENT NULL AS text INDENT);
SELECT xmlserialize(CONTENT NULL AS text INDENT);
-- indent with XML declaration
SELECT xmlserialize(DOCUMENT '<?xml version="1.0" encoding="UTF-8"?><foo><bar><val>73</val></bar></foo>' AS text INDENT);
SELECT xmlserialize(CONTENT '<?xml version="1.0" encoding="UTF-8"?><foo><bar><val>73</val></bar></foo>' AS text INDENT);
-- indent containing DOCTYPE declaration
SELECT xmlserialize(DOCUMENT '<!DOCTYPE a><a/>' AS text INDENT);
SELECT xmlserialize(CONTENT '<!DOCTYPE a><a/>' AS text INDENT);
-- indent xml with empty element
SELECT xmlserialize(DOCUMENT '<foo><bar></bar></foo>' AS text INDENT);
SELECT xmlserialize(CONTENT '<foo><bar></bar></foo>' AS text INDENT);
-- 'no indent' = not using 'no indent'
SELECT xmlserialize(DOCUMENT '<foo><bar><val x="y">42</val></bar></foo>' AS text) = xmlserialize(DOCUMENT '<foo><bar><val x="y">42</val></bar></foo>' AS text NO INDENT);
SELECT xmlserialize(CONTENT '<foo><bar><val x="y">42</val></bar></foo>' AS text) = xmlserialize(CONTENT '<foo><bar><val x="y">42</val></bar></foo>' AS text NO INDENT);
SELECT xml '<foo>bar</foo>' IS DOCUMENT;
SELECT xml '<foo>bar</foo><bar>foo</bar>' IS DOCUMENT;