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664 lines
26 KiB
664 lines
26 KiB
///! Integration tests based on [SPARQL 1.1 Test Cases](https://www.w3.org/2009/sparql/docs/tests/README.html)
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use failure::format_err;
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use rudf::model::vocab::rdf;
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use rudf::model::vocab::rdfs;
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use rudf::model::*;
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use rudf::rio::turtle::read_turtle;
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use rudf::rio::xml::read_rdf_xml;
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use rudf::sparql::algebra::Query;
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use rudf::sparql::algebra::QueryResult;
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use rudf::sparql::parser::read_sparql_query;
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use rudf::sparql::xml_results::read_xml_results;
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use rudf::sparql::PreparedQuery;
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use rudf::sparql::SparqlDataset;
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use rudf::store::MemoryDataset;
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use rudf::Result;
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use std::fmt;
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use std::fs::File;
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use std::io::{BufRead, BufReader};
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use std::path::PathBuf;
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use std::str::FromStr;
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use url::Url;
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#[test]
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fn sparql_w3c_syntax_testsuite() {
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let manifest_10_url =
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/manifest-syntax.ttl")
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.unwrap();
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let manifest_11_url = Url::parse(
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"http://www.w3.org/2009/sparql/docs/tests/data-sparql11/syntax-query/manifest.ttl",
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)
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.unwrap();
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let test_blacklist = vec![
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NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/syntax-sparql2/manifest#syntax-form-construct02").unwrap(),
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//TODO: Deserialization of the serialization failing:
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NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/syntax-sparql2/manifest#syntax-form-construct04").unwrap(),
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NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/syntax-sparql2/manifest#syntax-function-04").unwrap(),
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NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/syntax-sparql1/manifest#syntax-qname-04").unwrap(),
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];
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for test_result in TestManifest::new(manifest_10_url).chain(TestManifest::new(manifest_11_url))
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{
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let test = test_result.unwrap();
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if test_blacklist.contains(&test.id) {
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continue;
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}
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if test.kind == "PositiveSyntaxTest" || test.kind == "PositiveSyntaxTest11" {
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match load_sparql_query(test.query.clone()) {
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Err(error) => assert!(false, "Failure on {} with error: {}", test, error),
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Ok(query) => {
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if let Err(error) = read_sparql_query(query.to_string().as_bytes(), None) {
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assert!(
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false,
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"Failure to deserialize \"{}\" of {} with error: {}",
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query.to_string(),
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test,
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error
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)
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}
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}
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}
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} else if test.kind == "NegativeSyntaxTest" || test.kind == "NegativeSyntaxTest11" {
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//TODO
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if let Ok(result) = load_sparql_query(test.query.clone()) {
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eprintln!("Failure on {}. The output tree is: {}", test, result);
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}
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} else {
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assert!(false, "Not supported test: {}", test);
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}
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}
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}
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#[test]
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fn sparql_w3c_query_evaluation_testsuite() {
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//TODO: dataset open-world
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let manifest_10_urls = vec![
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/algebra/manifest.ttl")
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.unwrap(),
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/ask/manifest.ttl")
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.unwrap(),
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/basic/manifest.ttl")
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.unwrap(),
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Url::parse(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/bnode-coreference/manifest.ttl",
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).unwrap(),
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Url::parse(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/boolean-effective-value/manifest.ttl",
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).unwrap(),
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Url::parse(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/bound/manifest.ttl",
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).unwrap(),
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/cast/manifest.ttl").unwrap(),
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/construct/manifest.ttl")
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.unwrap(),
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/distinct/manifest.ttl")
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.unwrap(),
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/expr-builtin/manifest.ttl")
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.unwrap(),
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/expr-equals/manifest.ttl")
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.unwrap(),
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/expr-ops/manifest.ttl")
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.unwrap(),
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/graph/manifest.ttl")
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.unwrap(),
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/i18n/manifest.ttl").unwrap(),
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/optional/manifest.ttl")
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.unwrap(),
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/reduced/manifest.ttl")
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.unwrap(),
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/regex/manifest.ttl")
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.unwrap(),
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/solution-seq/manifest.ttl")
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.unwrap(),
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/sort/manifest.ttl").unwrap(),
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Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/triple-match/manifest.ttl")
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.unwrap(),
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Url::parse(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/type-promotion/manifest.ttl",
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).unwrap(),
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];
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let test_blacklist = vec![
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//Multiple writing of the same xsd:integer. Our system does strong normalization.
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NamedNode::from_str(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/distinct/manifest#distinct-1",
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).unwrap(),
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NamedNode::from_str(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/distinct/manifest#distinct-9",
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).unwrap(),
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NamedNode::from_str(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/expr-builtin/manifest#dawg-str-1",
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).unwrap(),
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NamedNode::from_str(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/expr-builtin/manifest#dawg-str-2",
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).unwrap(),
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NamedNode::from_str(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/expr-equals/manifest#eq-graph-1",
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).unwrap(),
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NamedNode::from_str(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/expr-equals/manifest#eq-graph-2",
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).unwrap(),
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//Multiple writing of the same xsd:double. Our system does strong normalization.
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NamedNode::from_str(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/expr-builtin/manifest#sameTerm",
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).unwrap(),
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NamedNode::from_str(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/expr-builtin/manifest#sameTerm-simple",
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).unwrap(),
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NamedNode::from_str(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/expr-builtin/manifest#sameTerm-eq",
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).unwrap(),
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NamedNode::from_str(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/expr-builtin/manifest#sameTerm-not-eq",
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).unwrap(),
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//Simple literal vs xsd:string. We apply RDF 1.1
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NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/distinct/manifest#distinct-2").unwrap(),
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//URI normalization: we are normalizing more strongly
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NamedNode::from_str(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/i18n/manifest#normalization-3",
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).unwrap(),
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//Test on curly brace scoping with OPTIONAL filter
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NamedNode::from_str(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/optional-filter/manifest#dawg-optional-filter-005-not-simplified",
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).unwrap(),
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//DATATYPE("foo"@en) returns rdf:langString in SPARQL 1.1
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NamedNode::from_str(
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"http://www.w3.org/2001/sw/DataAccess/tests/data-r2/expr-builtin/manifest#dawg-datatype-2",
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).unwrap()
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];
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for test_result in manifest_10_urls
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.into_iter()
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.flat_map(|manifest| TestManifest::new(manifest))
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{
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let test = test_result.unwrap();
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if test_blacklist.contains(&test.id) {
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continue;
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}
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if test.kind == "QueryEvaluationTest" {
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let data = match &test.data {
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Some(data) => {
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let dataset = MemoryDataset::default();
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let dataset_default = dataset.default_graph();
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load_graph(data.clone())
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.unwrap()
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.iter()
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.for_each(|triple| dataset_default.insert(triple).unwrap());
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dataset
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}
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None => MemoryDataset::default(),
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};
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for graph_data in &test.graph_data {
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let named_graph = data
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.named_graph(&NamedNode::from(graph_data.clone()).into())
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.unwrap();
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load_graph(graph_data.clone())
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.unwrap()
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.iter()
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.for_each(|triple| named_graph.insert(triple).unwrap());
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}
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match data.prepare_query(read_file(&test.query).unwrap()) {
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Err(error) => assert!(
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false,
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"Failure to parse query of {} with error: {}",
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test, error
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),
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Ok(query) => match query.exec() {
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Err(error) => assert!(
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false,
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"Failure to execute query of {} with error: {}",
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test, error
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),
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Ok(result) => {
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let expected_graph =
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load_sparql_query_result_graph(test.result.clone().unwrap()).unwrap();
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let with_order = expected_graph
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.triples_for_predicate(&rs::INDEX)
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.next()
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.is_some();
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let actual_graph = to_graph(result, with_order).unwrap();
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assert!(
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actual_graph.is_isomorphic(&expected_graph),
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"Failure on {}.\nExpected file:\n{}\nOutput file:\n{}\nParsed query:\n{}\nData:\n{}\n",
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test,
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expected_graph,
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actual_graph,
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load_sparql_query(test.query.clone()).unwrap(),
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data
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)
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}
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},
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}
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} else {
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assert!(false, "Not supported test: {}", test);
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}
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}
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}
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fn load_graph(url: Url) -> Result<SimpleGraph> {
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if url.as_str().ends_with(".ttl") {
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read_turtle(read_file(&url)?, Some(url))?.collect()
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} else if url.as_str().ends_with(".rdf") {
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read_rdf_xml(read_file(&url)?, Some(url))?.collect()
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} else {
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Err(format_err!("Serialization type not found for {}", url))
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}
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}
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fn load_sparql_query(url: Url) -> Result<Query> {
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read_sparql_query(read_file(&url)?, Some(url))
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}
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fn load_sparql_query_result_graph(url: Url) -> Result<SimpleGraph> {
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if url.as_str().ends_with(".srx") {
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to_graph(read_xml_results(read_file(&url)?)?, false)
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} else {
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load_graph(url)
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}
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}
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fn to_relative_path(url: &Url) -> Result<String> {
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let url = url.as_str();
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if url.starts_with("http://www.w3.org/2001/sw/DataAccess/tests/data-r2/") {
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Ok(url.replace(
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"http://www.w3.org/2001/sw/DataAccess/tests/",
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"rdf-tests/sparql11/",
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))
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} else if url.starts_with("http://www.w3.org/2009/sparql/docs/tests/data-sparql11/") {
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Ok(url.replace(
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"http://www.w3.org/2009/sparql/docs/tests/",
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"rdf-tests/sparql11/",
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))
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} else {
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Err(format_err!("Not supported url for file: {}", url))
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}
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}
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fn read_file(url: &Url) -> Result<impl BufRead> {
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let mut base_path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
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base_path.push("tests");
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base_path.push(to_relative_path(url)?);
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Ok(BufReader::new(File::open(&base_path).map_err(|e| {
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format_err!("Opening file {} failed with {}", base_path.display(), e)
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})?))
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}
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mod rs {
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use lazy_static::lazy_static;
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use rudf::model::NamedNode;
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use std::str::FromStr;
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lazy_static! {
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pub static ref RESULT_SET: NamedNode =
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NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/result-set#ResultSet")
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.unwrap();
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pub static ref RESULT_VARIABLE: NamedNode = NamedNode::from_str(
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"http://www.w3.org/2001/sw/DataAccess/tests/result-set#resultVariable"
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)
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.unwrap();
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pub static ref SOLUTION: NamedNode =
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NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/result-set#solution")
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.unwrap();
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pub static ref BINDING: NamedNode =
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NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/result-set#binding")
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.unwrap();
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pub static ref VALUE: NamedNode =
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NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/result-set#value")
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.unwrap();
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pub static ref VARIABLE: NamedNode =
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NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/result-set#variable")
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.unwrap();
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pub static ref INDEX: NamedNode =
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NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/result-set#index")
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.unwrap();
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pub static ref BOOLEAN: NamedNode =
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NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/result-set#boolean")
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.unwrap();
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}
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}
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|
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fn to_graph(result: QueryResult<'_>, with_order: bool) -> Result<SimpleGraph> {
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match result {
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QueryResult::Graph(graph) => graph.collect(),
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QueryResult::Boolean(value) => {
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let mut graph = SimpleGraph::default();
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let result_set = BlankNode::default();
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graph.insert(Triple::new(
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result_set.clone(),
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rdf::TYPE.clone(),
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|
rs::RESULT_SET.clone(),
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));
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graph.insert(Triple::new(
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|
result_set.clone(),
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|
rs::BOOLEAN.clone(),
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|
Literal::from(value),
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));
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Ok(graph)
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|
}
|
|
QueryResult::Bindings(bindings) => {
|
|
let mut graph = SimpleGraph::default();
|
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let result_set = BlankNode::default();
|
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graph.insert(Triple::new(
|
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result_set.clone(),
|
|
rdf::TYPE.clone(),
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|
rs::RESULT_SET.clone(),
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|
));
|
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let (variables, iter) = bindings.destruct();
|
|
for variable in &variables {
|
|
graph.insert(Triple::new(
|
|
result_set.clone(),
|
|
rs::RESULT_VARIABLE.clone(),
|
|
Literal::new_simple_literal(variable.name()?),
|
|
));
|
|
}
|
|
for (i, binding_values) in iter.enumerate() {
|
|
let binding_values = binding_values?;
|
|
let solution = BlankNode::default();
|
|
graph.insert(Triple::new(
|
|
result_set.clone(),
|
|
rs::SOLUTION.clone(),
|
|
solution.clone(),
|
|
));
|
|
for i in 0..variables.len() {
|
|
if let Some(ref value) = binding_values[i] {
|
|
let binding = BlankNode::default();
|
|
graph.insert(Triple::new(
|
|
solution.clone(),
|
|
rs::BINDING.clone(),
|
|
binding.clone(),
|
|
));
|
|
graph.insert(Triple::new(
|
|
binding.clone(),
|
|
rs::VALUE.clone(),
|
|
value.clone(),
|
|
));
|
|
graph.insert(Triple::new(
|
|
binding.clone(),
|
|
rs::VARIABLE.clone(),
|
|
Literal::new_simple_literal(variables[i].name()?),
|
|
));
|
|
}
|
|
}
|
|
if with_order {
|
|
graph.insert(Triple::new(
|
|
solution.clone(),
|
|
rs::INDEX.clone(),
|
|
Literal::from((i + 1) as i128),
|
|
));
|
|
}
|
|
}
|
|
Ok(graph)
|
|
}
|
|
}
|
|
}
|
|
|
|
pub struct Test {
|
|
pub id: NamedNode,
|
|
pub kind: String,
|
|
pub name: Option<String>,
|
|
pub comment: Option<String>,
|
|
pub query: Url,
|
|
pub data: Option<Url>,
|
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pub graph_data: Vec<Url>,
|
|
pub result: Option<Url>,
|
|
}
|
|
|
|
impl fmt::Display for Test {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
write!(f, "{}", self.kind)?;
|
|
for name in &self.name {
|
|
write!(f, " named \"{}\"", name)?;
|
|
}
|
|
for comment in &self.comment {
|
|
write!(f, " with comment \"{}\"", comment)?;
|
|
}
|
|
write!(f, " on query {}", self.query)?;
|
|
for data in &self.data {
|
|
write!(f, " with data {}", data)?;
|
|
}
|
|
for data in &self.graph_data {
|
|
write!(f, " and graph data {}", data)?;
|
|
}
|
|
for result in &self.result {
|
|
write!(f, " and expected result {}", result)?;
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
pub struct TestManifest {
|
|
graph: SimpleGraph,
|
|
tests_to_do: Vec<Term>,
|
|
manifests_to_do: Vec<Url>,
|
|
}
|
|
|
|
impl TestManifest {
|
|
pub fn new(url: Url) -> TestManifest {
|
|
Self {
|
|
graph: SimpleGraph::default(),
|
|
tests_to_do: Vec::default(),
|
|
manifests_to_do: vec![url],
|
|
}
|
|
}
|
|
}
|
|
|
|
pub mod mf {
|
|
use lazy_static::lazy_static;
|
|
use rudf::model::NamedNode;
|
|
use std::str::FromStr;
|
|
|
|
lazy_static! {
|
|
pub static ref INCLUDE: NamedNode =
|
|
NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/test-manifest#include")
|
|
.unwrap();
|
|
pub static ref ENTRIES: NamedNode =
|
|
NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/test-manifest#entries")
|
|
.unwrap();
|
|
pub static ref NAME: NamedNode =
|
|
NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/test-manifest#name")
|
|
.unwrap();
|
|
pub static ref ACTION: NamedNode =
|
|
NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/test-manifest#action")
|
|
.unwrap();
|
|
pub static ref RESULT: NamedNode =
|
|
NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/test-manifest#result")
|
|
.unwrap();
|
|
}
|
|
}
|
|
|
|
pub mod qt {
|
|
use lazy_static::lazy_static;
|
|
use rudf::model::NamedNode;
|
|
use std::str::FromStr;
|
|
|
|
lazy_static! {
|
|
pub static ref QUERY: NamedNode =
|
|
NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/test-query#query")
|
|
.unwrap();
|
|
pub static ref DATA: NamedNode =
|
|
NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/test-query#data")
|
|
.unwrap();
|
|
pub static ref GRAPH_DATA: NamedNode =
|
|
NamedNode::from_str("http://www.w3.org/2001/sw/DataAccess/tests/test-query#graphData")
|
|
.unwrap();
|
|
}
|
|
}
|
|
|
|
impl Iterator for TestManifest {
|
|
type Item = Result<Test>;
|
|
|
|
fn next(&mut self) -> Option<Result<Test>> {
|
|
match self.tests_to_do.pop() {
|
|
Some(Term::NamedNode(test_node)) => {
|
|
let test_subject = NamedOrBlankNode::from(test_node.clone());
|
|
let kind = match self
|
|
.graph
|
|
.object_for_subject_predicate(&test_subject, &rdf::TYPE)
|
|
{
|
|
Some(Term::NamedNode(c)) => match c.as_str().split("#").last() {
|
|
Some(k) => k.to_string(),
|
|
None => return self.next(), //We ignore the test
|
|
},
|
|
_ => return self.next(), //We ignore the test
|
|
};
|
|
let name = match self
|
|
.graph
|
|
.object_for_subject_predicate(&test_subject, &mf::NAME)
|
|
{
|
|
Some(Term::Literal(c)) => Some(c.value().to_string()),
|
|
_ => None,
|
|
};
|
|
let comment = match self
|
|
.graph
|
|
.object_for_subject_predicate(&test_subject, &rdfs::COMMENT)
|
|
{
|
|
Some(Term::Literal(c)) => Some(c.value().to_string()),
|
|
_ => None,
|
|
};
|
|
let (query, data, graph_data) = match self
|
|
.graph
|
|
.object_for_subject_predicate(&test_subject, &*mf::ACTION)
|
|
{
|
|
Some(Term::NamedNode(n)) => (n.clone().into(), None, vec![]),
|
|
Some(Term::BlankNode(n)) => {
|
|
let n = n.clone().into();
|
|
let query = match self.graph.object_for_subject_predicate(&n, &qt::QUERY) {
|
|
Some(Term::NamedNode(q)) => q.clone().into(),
|
|
Some(_) => return Some(Err(format_err!("invalid query"))),
|
|
None => return Some(Err(format_err!("query not found"))),
|
|
};
|
|
let data = match self.graph.object_for_subject_predicate(&n, &qt::DATA) {
|
|
Some(Term::NamedNode(q)) => Some(q.clone().into()),
|
|
_ => None,
|
|
};
|
|
let graph_data = self
|
|
.graph
|
|
.objects_for_subject_predicate(&n, &qt::GRAPH_DATA)
|
|
.filter_map(|g| match g {
|
|
Term::NamedNode(q) => Some(q.clone().into()),
|
|
_ => None,
|
|
})
|
|
.collect();
|
|
(query, data, graph_data)
|
|
}
|
|
Some(_) => return Some(Err(format_err!("invalid action"))),
|
|
None => {
|
|
return Some(Err(format_err!(
|
|
"action not found for test {}",
|
|
test_subject
|
|
)));
|
|
}
|
|
};
|
|
let result = match self
|
|
.graph
|
|
.object_for_subject_predicate(&test_subject, &*mf::RESULT)
|
|
{
|
|
Some(Term::NamedNode(n)) => Some(n.clone().into()),
|
|
Some(_) => return Some(Err(format_err!("invalid result"))),
|
|
None => None,
|
|
};
|
|
Some(Ok(Test {
|
|
id: test_node,
|
|
kind,
|
|
name,
|
|
comment,
|
|
query,
|
|
data,
|
|
graph_data,
|
|
result,
|
|
}))
|
|
}
|
|
Some(_) => Some(Err(format_err!("invalid test list"))),
|
|
None => {
|
|
match self.manifests_to_do.pop() {
|
|
Some(url) => {
|
|
let manifest = NamedOrBlankNode::from(NamedNode::new(url.clone()));
|
|
match load_graph(url) {
|
|
Ok(g) => self.graph.extend(g.into_iter()),
|
|
Err(e) => return Some(Err(e.into())),
|
|
}
|
|
|
|
// New manifests
|
|
match self
|
|
.graph
|
|
.object_for_subject_predicate(&manifest, &*mf::INCLUDE)
|
|
{
|
|
Some(Term::BlankNode(list)) => {
|
|
self.manifests_to_do.extend(
|
|
RdfListIterator::iter(&self.graph, list.clone().into())
|
|
.filter_map(|m| match m {
|
|
Term::NamedNode(nm) => Some(nm.as_url().clone()),
|
|
_ => None,
|
|
}),
|
|
);
|
|
}
|
|
Some(_) => return Some(Err(format_err!("invalid tests list"))),
|
|
None => (),
|
|
}
|
|
|
|
// New tests
|
|
match self
|
|
.graph
|
|
.object_for_subject_predicate(&manifest, &*mf::ENTRIES)
|
|
{
|
|
Some(Term::BlankNode(list)) => {
|
|
self.tests_to_do.extend(RdfListIterator::iter(
|
|
&self.graph,
|
|
list.clone().into(),
|
|
));
|
|
}
|
|
Some(term) => {
|
|
return Some(Err(format_err!(
|
|
"Invalid tests list. Got term {}",
|
|
term
|
|
)));
|
|
}
|
|
None => (),
|
|
}
|
|
}
|
|
None => return None,
|
|
}
|
|
self.next()
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub struct RdfListIterator<'a> {
|
|
graph: &'a SimpleGraph,
|
|
current_node: Option<NamedOrBlankNode>,
|
|
}
|
|
|
|
impl<'a> RdfListIterator<'a> {
|
|
fn iter(graph: &'a SimpleGraph, root: NamedOrBlankNode) -> RdfListIterator<'a> {
|
|
RdfListIterator {
|
|
graph,
|
|
current_node: Some(root),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a> Iterator for RdfListIterator<'a> {
|
|
type Item = Term;
|
|
|
|
fn next(&mut self) -> Option<Term> {
|
|
match self.current_node.clone() {
|
|
Some(current) => {
|
|
let result = self
|
|
.graph
|
|
.object_for_subject_predicate(¤t, &rdf::FIRST);
|
|
self.current_node = match self
|
|
.graph
|
|
.object_for_subject_predicate(¤t, &rdf::REST)
|
|
{
|
|
Some(Term::NamedNode(ref n)) if *n == *rdf::NIL => None,
|
|
Some(Term::NamedNode(n)) => Some(n.clone().into()),
|
|
Some(Term::BlankNode(n)) => Some(n.clone().into()),
|
|
_ => None,
|
|
};
|
|
result.cloned()
|
|
}
|
|
None => None,
|
|
}
|
|
}
|
|
}
|
|
|