Transform sparql module from fantoir-datasource in standalone crate
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Authored by dereckson on Jan 14 2023, 19:02.

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	F2121798: Transform sparql module from fantoir-datasource in standalone crate
	Jan 14 2023, 19:02

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	impl SparqlResults {
	pub fn into_bool (self) -> Option<bool> {
	match self {
	SparqlResults::Solutions(_) => None,
	SparqlResults::Boolean(bool) => Some(bool),
	}
	}
	}

	/* -------------------------------------------------------------
	Tests
	- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

	#[cfg(test)]
	mod tests {
	use super::*;

	#[test]
	pub fn test_parse_boolean_results () {
	let boolean_results = r#"
	<?xml version="1.0"?>
	<sparql xmlns="http://www.w3.org/2005/sparql-results#">
	<head />
	<boolean>true</boolean>
	</sparql>
	"#;

	let results = parse_sparql_results(boolean_results);
	let actual = results.into_bool();

	assert!(actual.is_some());
	assert!(actual.unwrap());
	}
	}

To avoid match/let ... = ...() in the middle of a HOF chain, I've prepared helper methods to read the inner content of an enum:

A SparqlEnum result can be transformed into_bool (UPDATE, INSERT, ...) or into_solutions (SELECT).

Wikidata endpoint only supports SELECT requests, and our code only need to select, so into_bool is never read.

If we release a SPARQL client, we need this.

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