rdf_fusion_functions/scalar/comparison/
less_than.rs

1use crate::scalar::dispatch::dispatch_binary_typed_value;
2use crate::scalar::sparql_op_impl::{
3    ScalarSparqlOpImpl, create_typed_value_sparql_op_impl,
4};
5use crate::scalar::{ScalarSparqlOp, ScalarSparqlOpSignature, SparqlOpArity};
6use rdf_fusion_encoding::typed_value::TypedValueEncoding;
7use rdf_fusion_extensions::functions::BuiltinName;
8use rdf_fusion_extensions::functions::FunctionName;
9use rdf_fusion_model::{ThinError, TypedValueRef};
10use std::cmp::Ordering;
11
12/// Implementation of the SPARQL `<` operator.
13#[derive(Debug, Hash, PartialEq, Eq)]
14pub struct LessThanSparqlOp;
15
16impl Default for LessThanSparqlOp {
17    fn default() -> Self {
18        Self::new()
19    }
20}
21
22impl LessThanSparqlOp {
23    const NAME: FunctionName = FunctionName::Builtin(BuiltinName::LessThan);
24
25    /// Creates a new [LessThanSparqlOp].
26    pub fn new() -> Self {
27        Self {}
28    }
29}
30
31impl ScalarSparqlOp for LessThanSparqlOp {
32    fn name(&self) -> &FunctionName {
33        &Self::NAME
34    }
35
36    fn signature(&self) -> ScalarSparqlOpSignature {
37        ScalarSparqlOpSignature::default_with_arity(SparqlOpArity::Fixed(2))
38    }
39
40    fn typed_value_encoding_op(
41        &self,
42    ) -> Option<Box<dyn ScalarSparqlOpImpl<TypedValueEncoding>>> {
43        Some(create_typed_value_sparql_op_impl(|args| {
44            dispatch_binary_typed_value(
45                &args.args[0],
46                &args.args[1],
47                |lhs_value, rhs_value| {
48                    lhs_value
49                        .partial_cmp(&rhs_value)
50                        .map(|o| o == Ordering::Less)
51                        .map(Into::into)
52                        .map(TypedValueRef::BooleanLiteral)
53                        .ok_or(ThinError::ExpectedError)
54                },
55                |_, _| ThinError::expected(),
56            )
57        }))
58    }
59}
rdf_fusion_functions/scalar/comparison/less_than.rs

rdf_fusion_functions/scalar/comparison/
less_than.rs
