SPARQL: properly validates VALUE clauses

lib/spargebra/src/parser.rs

@@ -1441,8 +1441,12 @@ parser! {
         rule InlineDataOneVar_value() -> Vec<Option<GroundTerm>> = t:DataBlockValue() _ { vec![t] }
 
         //[64]
-        rule InlineDataFull() -> (Vec<Variable>, Vec<Vec<Option<GroundTerm>>>) = "(" _ vars:InlineDataFull_var()* _ ")" _ "{" _ val:InlineDataFull_values()* "}" {
+        rule InlineDataFull() -> (Vec<Variable>, Vec<Vec<Option<GroundTerm>>>) = "(" _ vars:InlineDataFull_var()* _ ")" _ "{" _ vals:InlineDataFull_values()* "}" {?
-            (vars, val)
+            if vals.iter().all(|vs| vs.len() == vars.len()) {
+                Ok((vars, vals))
+            } else {
+                Err("The VALUES clause rows should have exactly the same number of values as there are variables. To set a value to undefined use UNDEF.")
+            }
         }
         rule InlineDataFull_var() -> Variable = v:Var() _ { v }
         rule InlineDataFull_values() -> Vec<Option<GroundTerm>> = "(" _ v:InlineDataFull_value()* _ ")" _ { v }

testsuite/oxigraph-tests/sparql/manifest.ttl

@@ -28,6 +28,8 @@
     :order_terms
     :nested_anonymous
     :unbound_variable_in_subquery
+    :values_too_many
+    :values_too_few
     ) .
 
 :small_unicode_escape_with_multibytes_char rdf:type mf:NegativeSyntaxTest ;
@@ -129,3 +131,11 @@
     mf:action
          [ qt:query  <unbound_variable_in_subquery.rq> ] ;
     mf:result  <unbound_variable_in_subquery.srx> .
+
+:values_too_many rdf:type mf:NegativeSyntaxTest11 ;
+    mf:name "Too many values in a VALUE clause compared to the number of variable" ;
+    mf:action <values_too_many.rq> .
+
+:values_too_few rdf:type mf:NegativeSyntaxTest11 ;
+    mf:name "Too few values in a VALUE clause compared to the number of variable" ;
+    mf:action <values_too_few.rq> .

testsuite/oxigraph-tests/sparql/values_too_few.rq

@@ -0,0 +1 @@
+SELECT * WHERE { VALUES (?a ?b) {  (1) } }

testsuite/oxigraph-tests/sparql/values_too_many.rq

@@ -0,0 +1 @@
+SELECT * WHERE { VALUES (?a ?b) {  (1 2 3) } }