improve ints in .try

mers/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mers"
-version = "0.9.4"
+version = "0.9.5"
 edition = "2021"
 license = "MIT OR Apache-2.0"
 description = "dynamically typed but type-checked programming language"
@@ -15,7 +15,7 @@ default = ["colored-output"]
 colored-output = ["mers_lib/ecolor-term", "mers_lib/pretty-print", "dep:colored"]
 
 [dependencies]
-mers_lib = "0.9.4"
+mers_lib = "0.9.5"
 # mers_lib = { path = "../mers_lib" }
 clap = { version = "4.3.19", features = ["derive"] }
 colored = { version = "2.1.0", optional = true }

mers_lib/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mers_lib"
-version = "0.9.4"
+version = "0.9.5"
 edition = "2021"
 license = "MIT OR Apache-2.0"
 description = "library to use the mers language in other projects"

mers_lib/src/data/int.rs

@@ -6,11 +6,11 @@ use super::{MersData, MersType, Type};
 
 /// The smallest representable integer.
 /// Depends on the system for which mers is being compiled, as mers uses pointer-sized signed integers.
-/// `-2^W`, `W` is the bit-width of a pointer on the system, often `32` or `64`.
+/// `-2^W`, `W` is the bit-width of a pointer on the system, often `32` or `64`, minus one.
 pub const INT_MIN: isize = isize::MIN;
 /// The largest representable integer.
 /// Depends on the system for which mers is being compiled, as mers uses pointer-sized signed integers.
-/// `2^W-1`, `W` is the bit-width of a pointer on the system, often `32` or `64`.
+/// `2^W-1`, `W` is the bit-width of a pointer on the system, often `32` or `64`, minus one.
 pub const INT_MAX: isize = isize::MAX;
 /// The smallest integer representable by mers and by a signed 32-bit number.
 /// `max(INT_MIN, -2^31)`
@@ -97,21 +97,26 @@ impl MersType for IntT {
         }
     }
     fn subtypes(&self, acc: &mut Type) {
-        acc.add(Arc::new(self.clone()));
-        // INT_MIN .. INT32U_MIN .. INT32S_MIN .. 0 .. INT32S_MAX .. INT32U_MAX .. INT_MAX
+        // INT_MIN .. INT32U_MIN .. INT32S_MIN .. -128 .. -1 .. 0 .. 1 .. 127 .. 255 .. 65535 .. INT32S_MAX .. INT32U_MAX .. INT_MAX
         let mut add_range = |min, max| {
             // the range is non-empty, self starts before or where the range ends, and self ends after or where the range starts.
-            if min <= max && self.0 <= max && self.1 >= min {
+            if min <= max && self.0 <= max && min <= self.1 {
                 acc.add(Arc::new(IntT(self.0.max(min), self.1.min(max))));
             }
         };
-        add_range(INT_MIN, INT32U_MIN - 1);
-        add_range(INT32U_MIN, INT32S_MIN - 1);
-        add_range(INT32S_MIN, -1);
+        add_range(INT_MIN, INT32U_MIN.saturating_sub(1));
+        add_range(INT32U_MIN, INT32S_MIN.saturating_sub(1));
+        add_range(INT32S_MIN, -129);
+        add_range(-128, -2);
+        add_range(-1, -1);
         add_range(0, 0);
-        add_range(1, INT32S_MAX);
-        add_range(INT32S_MAX + 1, INT32U_MAX);
-        add_range(INT32U_MAX + 1, INT_MAX);
+        add_range(1, 1);
+        add_range(2, 127);
+        add_range(128, 255);
+        add_range(256, 65535);
+        add_range(65536, INT32S_MAX);
+        add_range(INT32S_MAX.saturating_add(1), INT32U_MAX);
+        add_range(INT32U_MAX.saturating_add(1), INT_MAX);
     }
     fn as_any(&self) -> &dyn Any {
         self

mers_lib/src/data/mod.rs

@@ -340,18 +340,26 @@ pub struct Type {
     // TODO: Maybe make sure this is always sorted by (recursive?!?) TypeId,
     // that way is_same_type_as can work more efficiently (cuz good code but also branch prediction)
     pub types: Vec<Arc<dyn MersType>>,
+    pub smart_type_simplification: bool,
 }
 impl Type {
     pub fn new<T: MersType>(t: T) -> Self {
         Self {
             types: vec![Arc::new(t)],
+            smart_type_simplification: true,
         }
     }
     pub fn newm(types: Vec<Arc<dyn MersType>>) -> Self {
-        Self { types }
+        Self {
+            types,
+            smart_type_simplification: true,
+        }
     }
     pub fn empty() -> Self {
-        Self { types: vec![] }
+        Self {
+            types: vec![],
+            smart_type_simplification: true,
+        }
     }
     pub fn empty_tuple() -> Self {
         Self::new(tuple::TupleT(vec![]))
@@ -413,7 +421,11 @@ impl Type {
         let n = new.as_any();
         if let Some(s) = n.downcast_ref::<Self>() {
             self.add_all(s);
-        } else if let Some(n) = n.downcast_ref::<crate::data::int::IntT>() {
+        } else if let Some(n) = self
+            .smart_type_simplification
+            .then(|| n.downcast_ref::<crate::data::int::IntT>())
+            .flatten()
+        {
             let n = n.clone();
             let mut newt = None;
             for a in &self.types {
@@ -429,7 +441,6 @@ impl Type {
                     }
                 }
             }
-            let newt2 = newt.is_some();
             // remove types that are included in `self` before adding `self`
             let newt = newt.unwrap_or(n);
             let mut rmstack = vec![];
@@ -443,9 +454,7 @@ impl Type {
             for i in rmstack.into_iter().rev() {
                 self.types.remove(i);
             }
-            if !newt2 {
-                self.types.push(new);
-            }
+            self.types.push(Arc::new(newt));
         } else {
             if !self.types.iter().any(|t| new.is_included_in(t.as_ref())) {
                 self.types.push(new);
@@ -500,6 +509,7 @@ impl Type {
     }
     pub fn subtypes_type(&self) -> Type {
         let mut acc = Type::empty();
+        acc.smart_type_simplification = false;
         self.subtypes(&mut acc);
         acc
     }