rishi/scryer-prolog
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improve matching on partial strings as lists

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This commit is contained in:
Mark Thom
2019-04-30 21:30:28 -06:00
parent d09aeb4125
commit b05cff3044
4 changed files with 15 additions and 9 deletions
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2
Cargo.toml
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@@ -1,6 +1,6 @@
[package]
name = "scryer-prolog"
version = "0.8.77"
version = "0.8.78"
authors = ["Mark Thom <markjordanthom@gmail.com>"]
repository = "https://github.com/mthom/scryer-prolog"
description = "A modern Prolog implementation written mostly in Rust."

9
src/prolog/indexing.rs
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@@ -58,8 +58,13 @@ impl CodeOffsets {
let is_initial_index = self.lists.is_empty();
self.lists.push(Self::add_index(is_initial_index, index));
},
&Term::Constant(_, Constant::String(_))
if !self.flags.double_quotes.is_atom() => { // strings are lists in this case.
&Term::Constant(_, Constant::String(ref s))
if !self.flags.double_quotes.is_atom() && !s.is_empty() => { // strings are lists in this case.
let is_initial_index = self.lists.is_empty();
self.lists.push(Self::add_index(is_initial_index, index));
},
&Term::Constant(_, Constant::String(ref s))
if !self.flags.double_quotes.is_atom() && s.is_expandable() => {
let is_initial_index = self.lists.is_empty();
self.lists.push(Self::add_index(is_initial_index, index));
},

3
src/prolog/machine/machine_state_impl.rs
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@@ -1496,7 +1496,8 @@ impl MachineState {
let offset = match addr {
Addr::HeapCell(_) | Addr::StackCell(..) | Addr::AttrVar(..) => v,
Addr::Con(Constant::String(_)) if !self.flags.double_quotes.is_atom() => l,
Addr::Con(Constant::String(ref s)) if !self.flags.double_quotes.is_atom() =>
if s.is_empty() && !s.is_expandable() { c } else { l },
Addr::Con(_) => c,
Addr::Lis(_) => l,
Addr::Str(_) => s,