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add find_semantic_subtype_matches() as potential alternative to is_semantic_subtype_of()

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Michael Sippel 2024-07-21 17:45:43 +02:00
parent 02d8815acd
commit 6c574d620f
Signed by: senvas
GPG key ID: F96CF119C34B64A6
1 changed files with 43 additions and 1 deletions
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44
src/subtype.rs
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@ -2,7 +2,49 @@ use crate::term::TypeTerm;
//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>\\
impl TypeTerm {
impl TypeTerm {
pub fn find_semantic_subtype_matches(&self, expected_type: &TypeTerm)
-> Option<(TypeTerm, TypeTerm, TypeTerm)>
{
let provided_lnf = self.clone().get_lnf_vec();
let expected_lnf = expected_type.clone().get_lnf_vec();
for i in 0..provided_lnf.len() {
if provided_lnf[i] == expected_lnf[0] {
// found first match.
// now find first mismatch.
for j in i..usize::min(provided_lnf.len(), i+expected_lnf.len()) {
if provided_lnf[j] != expected_lnf[ j-i ] {
eprintln!("found match at {}, mismatch at {}", i, j);
let syntactic_subladder = TypeTerm::Ladder( provided_lnf[ 0 .. j ].into_iter().cloned().collect() );
let provided_reprladder = TypeTerm::Ladder( provided_lnf[ j .. ].into_iter().cloned().collect() );
let expected_reprladder = TypeTerm::Ladder( expected_lnf[ j-i .. ].into_iter().cloned().collect() );
return Some((syntactic_subladder, provided_reprladder, expected_reprladder));
}
}
eprintln!("only syntactic subtype");
// syntactic subtype
let n = {
if provided_lnf.len() + i < expected_lnf.len() {
1
} else {
2
}
};
let syntactic_subladder = TypeTerm::Ladder( provided_lnf[ 0 .. provided_lnf.len()-1 ].into_iter().cloned().collect() );
let provided_reprladder = TypeTerm::Ladder( provided_lnf[ provided_lnf.len()-n .. ].into_iter().cloned().collect() );
let expected_reprladder = TypeTerm::Ladder( expected_lnf[ provided_lnf.len()-n-i .. ].into_iter().cloned().collect() );
return Some((syntactic_subladder, provided_reprladder, expected_reprladder));
}
}
None
}
// returns ladder-step of first match and provided representation-type
pub fn is_semantic_subtype_of(&self, expected_type: &TypeTerm) -> Option<(usize, TypeTerm)> {
let provided_lnf = self.clone().get_lnf_vec();