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Uses new quick-xml APIs for XML results serialization

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pull/435/head
Tpt 2 years ago committed by Thomas Tanon
parent 0f43ef19e3
commit 20dc1f26df
1 changed files with 62 additions and 50 deletions
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  1. 112
      lib/sparesults/src/xml.rs

112
lib/sparesults/src/xml.rs
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@ -18,19 +18,17 @@ pub fn write_boolean_xml_result<W: Write>(sink: W, value: bool) -> io::Result<W>
fn do_write_boolean_xml_result<W: Write>(sink: W, value: bool) -> Result<W, quick_xml::Error> {
let mut writer = Writer::new(sink);
writer.write_event(Event::Decl(BytesDecl::new("1.0", None, None)))?;
let mut sparql_open = BytesStart::new("sparql");
sparql_open.push_attribute(("xmlns", "http://www.w3.org/2005/sparql-results#"));
writer.write_event(Event::Start(sparql_open))?;
writer.write_event(Event::Start(BytesStart::new("head")))?;
writer.write_event(Event::End(BytesEnd::new("head")))?;
writer.write_event(Event::Start(BytesStart::new("boolean")))?;
writer.write_event(Event::Text(BytesText::new(if value {
"true"
} else {
"false"
})))?;
writer.write_event(Event::End(BytesEnd::new("boolean")))?;
writer.write_event(Event::End(BytesEnd::new("sparql")))?;
writer
.create_element("sparql")
.with_attribute(("xmlns", "http://www.w3.org/2005/sparql-results#"))
.write_inner_content(|writer| {
writer
.create_element("head")
.write_text_content(BytesText::new(""))?
.create_element("boolean")
.write_text_content(BytesText::new(if value { "true" } else { "false" }))?;
Ok(())
})?;
Ok(writer.into_inner())
}
@ -49,13 +47,17 @@ impl<W: Write> XmlSolutionsWriter<W> {
let mut sparql_open = BytesStart::new("sparql");
sparql_open.push_attribute(("xmlns", "http://www.w3.org/2005/sparql-results#"));
writer.write_event(Event::Start(sparql_open))?;
writer.write_event(Event::Start(BytesStart::new("head")))?;
for variable in &variables {
let mut variable_tag = BytesStart::new("variable");
variable_tag.push_attribute(("name", variable.as_str()));
writer.write_event(Event::Empty(variable_tag))?;
}
writer.write_event(Event::End(BytesEnd::new("head")))?;
writer
.create_element("head")
.write_inner_content(|writer| {
for variable in &variables {
writer
.create_element("variable")
.with_attribute(("name", variable.as_str()))
.write_empty()?;
}
Ok(())
})?;
writer.write_event(Event::Start(BytesStart::new("results")))?;
Ok(Self { writer })
}
@ -74,12 +76,13 @@ impl<W: Write> XmlSolutionsWriter<W> {
self.writer
.write_event(Event::Start(BytesStart::new("result")))?;
for (variable, value) in solution {
let mut binding_tag = BytesStart::new("binding");
binding_tag.push_attribute(("name", variable.as_str()));
self.writer.write_event(Event::Start(binding_tag))?;
write_xml_term(value, &mut self.writer)?;
self.writer
.write_event(Event::End(BytesEnd::new("binding")))?;
.create_element("binding")
.with_attribute(("name", variable.as_str()))
.write_inner_content(|writer| {
write_xml_term(value, writer)?;
Ok(())
})?;
}
self.writer.write_event(Event::End(BytesEnd::new("result")))
}
@ -105,39 +108,48 @@ fn write_xml_term(
) -> Result<(), quick_xml::Error> {
match term {
TermRef::NamedNode(uri) => {
writer.write_event(Event::Start(BytesStart::new("uri")))?;
writer.write_event(Event::Text(BytesText::new(uri.as_str())))?;
writer.write_event(Event::End(BytesEnd::new("uri")))?;
writer
.create_element("uri")
.write_text_content(BytesText::new(uri.as_str()))?;
}
TermRef::BlankNode(bnode) => {
writer.write_event(Event::Start(BytesStart::new("bnode")))?;
writer.write_event(Event::Text(BytesText::new(bnode.as_str())))?;
writer.write_event(Event::End(BytesEnd::new("bnode")))?;
writer
.create_element("bnode")
.write_text_content(BytesText::new(bnode.as_str()))?;
}
TermRef::Literal(literal) => {
let mut literal_tag = BytesStart::new("literal");
if let Some(language) = literal.language() {
literal_tag.push_attribute(("xml:lang", language));
let element = writer.create_element("literal");
let element = if let Some(language) = literal.language() {
element.with_attribute(("xml:lang", language))
} else if !literal.is_plain() {
literal_tag.push_attribute(("datatype", literal.datatype().as_str()));
}
writer.write_event(Event::Start(literal_tag))?;
writer.write_event(Event::Text(BytesText::new(literal.value())))?;
writer.write_event(Event::End(BytesEnd::new("literal")))?;
element.with_attribute(("datatype", literal.datatype().as_str()))
} else {
element
};
element.write_text_content(BytesText::new(literal.value()))?;
}
#[cfg(feature = "rdf-star")]
TermRef::Triple(triple) => {
writer.write_event(Event::Start(BytesStart::new("triple")))?;
writer.write_event(Event::Start(BytesStart::new("subject")))?;
write_xml_term(triple.subject.as_ref().into(), writer)?;
writer.write_event(Event::End(BytesEnd::new("subject")))?;
writer.write_event(Event::Start(BytesStart::new("predicate")))?;
write_xml_term(triple.predicate.as_ref().into(), writer)?;
writer.write_event(Event::End(BytesEnd::new("predicate")))?;
writer.write_event(Event::Start(BytesStart::new("object")))?;
write_xml_term(triple.object.as_ref(), writer)?;
writer.write_event(Event::End(BytesEnd::new("object")))?;
writer.write_event(Event::End(BytesEnd::new("triple")))?;
writer
.create_element("triple")
.write_inner_content(|writer| {
writer
.create_element("subject")
.write_inner_content(|writer| {
write_xml_term(triple.subject.as_ref().into(), writer)
})?;
writer
.create_element("predicate")
.write_inner_content(|writer| {
write_xml_term(triple.predicate.as_ref().into(), writer)
})?;
writer
.create_element("object")
.write_inner_content(|writer| {
write_xml_term(triple.object.as_ref(), writer)
})?;
Ok(())
})?;
}
}
Ok(())

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