Support switch range cases for floating-point values.

CHANGELOG.md

@@ -17,6 +17,7 @@ Enhancements
 ------------
 
 * The functions `min` and `max` are added for numbers.
+* Range cases in `switch` statements now also match floating-point and decimal values. In order to support this, however, small numeric ranges cases are no longer unrolled.
 
 
 Version 1.12.0

src/ast/stmt.rs

@@ -4,8 +4,9 @@ use super::{ASTFlags, ASTNode, BinaryExpr, Expr, FnCallExpr, Ident};
 use crate::engine::{KEYWORD_EVAL, OP_EQUALS};
 use crate::func::StraightHashMap;
 use crate::tokenizer::Token;
+use crate::types::dynamic::Union;
 use crate::types::Span;
-use crate::{calc_fn_hash, Position, StaticVec, INT};
+use crate::{calc_fn_hash, Dynamic, Position, StaticVec, INT};
 #[cfg(feature = "no_std")]
 use std::prelude::v1::*;
 use std::{
@@ -257,7 +258,7 @@ impl IntoIterator for RangeCase {
     type Item = INT;
     type IntoIter = Box<dyn Iterator<Item = Self::Item>>;
 
-    #[inline(always)]
+    #[inline]
     #[must_use]
     fn into_iter(self) -> Self::IntoIter {
         match self {
@@ -269,7 +270,7 @@ impl IntoIterator for RangeCase {
 
 impl RangeCase {
     /// Returns `true` if the range contains no items.
-    #[inline(always)]
+    #[inline]
     #[must_use]
     pub fn is_empty(&self) -> bool {
         match self {
@@ -278,7 +279,7 @@ impl RangeCase {
         }
     }
     /// Size of the range.
-    #[inline(always)]
+    #[inline]
     #[must_use]
     pub fn len(&self) -> INT {
         match self {
@@ -288,15 +289,56 @@ impl RangeCase {
             Self::InclusiveInt(r, ..) => *r.end() - *r.start() + 1,
         }
     }
-    /// Is the specified number within this range?
+    /// Is the specified value within this range?
-    #[inline(always)]
+    #[inline]
     #[must_use]
-    pub fn contains(&self, n: INT) -> bool {
+    pub fn contains(&self, value: &Dynamic) -> bool {
+        match value {
+            Dynamic(Union::Int(v, ..)) => self.contains_int(*v),
+            #[cfg(not(feature = "no_float"))]
+            Dynamic(Union::Float(v, ..)) => self.contains_float(**v),
+            #[cfg(feature = "decimal")]
+            Dynamic(Union::Decimal(v, ..)) => self.contains_decimal(**v),
+            _ => false,
+        }
+    }
+    /// Is the specified number within this range?
+    #[inline]
+    #[must_use]
+    pub fn contains_int(&self, n: INT) -> bool {
         match self {
             Self::ExclusiveInt(r, ..) => r.contains(&n),
             Self::InclusiveInt(r, ..) => r.contains(&n),
         }
     }
+    /// Is the specified floating-point number within this range?
+    #[cfg(not(feature = "no_float"))]
+    #[inline]
+    #[must_use]
+    pub fn contains_float(&self, n: crate::FLOAT) -> bool {
+        use crate::FLOAT;
+
+        match self {
+            Self::ExclusiveInt(r, ..) => ((r.start as FLOAT)..(r.end as FLOAT)).contains(&n),
+            Self::InclusiveInt(r, ..) => ((*r.start() as FLOAT)..=(*r.end() as FLOAT)).contains(&n),
+        }
+    }
+    /// Is the specified decimal number within this range?
+    #[cfg(feature = "decimal")]
+    #[inline]
+    #[must_use]
+    pub fn contains_decimal(&self, n: rust_decimal::Decimal) -> bool {
+        use rust_decimal::Decimal;
+
+        match self {
+            Self::ExclusiveInt(r, ..) => {
+                (Into::<Decimal>::into(r.start)..Into::<Decimal>::into(r.end)).contains(&n)
+            }
+            Self::InclusiveInt(r, ..) => {
+                (Into::<Decimal>::into(*r.start())..=Into::<Decimal>::into(*r.end())).contains(&n)
+            }
+        }
+    }
     /// Is the specified range inclusive?
     #[inline(always)]
     #[must_use]

src/eval/stmt.rs

@@ -3,7 +3,8 @@
 use super::{Caches, EvalContext, GlobalRuntimeState, Target};
 use crate::api::events::VarDefInfo;
 use crate::ast::{
-    ASTFlags, BinaryExpr, Expr, FlowControl, OpAssignment, Stmt, SwitchCasesCollection,
+    ASTFlags, BinaryExpr, ConditionalExpr, Expr, FlowControl, OpAssignment, Stmt,
+    SwitchCasesCollection,
 };
 use crate::func::{get_builtin_op_assignment_fn, get_hasher};
 use crate::types::dynamic::{AccessMode, Union};
@@ -359,15 +360,13 @@ impl Engine {
                                 break;
                             }
                         }
-                    } else if value.is_int() && !ranges.is_empty() {
+                    } else if !ranges.is_empty() {
                         // Then check integer ranges
-                        let value = value.as_int().expect("`INT`");
+                        for r in ranges.iter().filter(|r| r.contains(&value)) {
+                            let ConditionalExpr { condition, expr } = &expressions[r.index()];
 
-                        for r in ranges.iter().filter(|r| r.contains(value)) {
+                            let cond_result = match condition {
-                            let block = &expressions[r.index()];
+                                Expr::BoolConstant(b, ..) => *b,
-
-                            let cond_result = match block.condition {
-                                Expr::BoolConstant(b, ..) => b,
                                 ref c => self
                                     .eval_expr(global, caches, scope, this_ptr.as_deref_mut(), c)?
                                     .as_bool()
@@ -377,7 +376,7 @@ impl Engine {
                             };
 
                             if cond_result {
-                                result = Some(&block.expr);
+                                result = Some(expr);
                                 break;
                             }
                         }

src/func/hashing.rs

@@ -28,6 +28,7 @@ impl Hasher for StraightHasher {
         self.0
     }
     #[cold]
+    #[inline(never)]
     fn write(&mut self, _bytes: &[u8]) {
         panic!("StraightHasher can only hash u64 values");
     }

src/optimizer.rs

@@ -563,16 +563,14 @@ fn optimize_stmt(stmt: &mut Stmt, state: &mut OptimizerState, preserve_result: b
             }
 
             // Then check ranges
-            if value.is_int() && !ranges.is_empty() {
+            if !ranges.is_empty() {
-                let value = value.as_int().unwrap();
-
                 // Only one range or all ranges without conditions
                 if ranges.len() == 1
                     || ranges
                         .iter()
                         .all(|r| expressions[r.index()].is_always_true())
                 {
-                    if let Some(r) = ranges.iter().find(|r| r.contains(value)) {
+                    if let Some(r) = ranges.iter().find(|r| r.contains(&value)) {
                         let range_block = &mut expressions[r.index()];
 
                         if range_block.is_always_true() {
@@ -619,7 +617,7 @@ fn optimize_stmt(stmt: &mut Stmt, state: &mut OptimizerState, preserve_result: b
 
                     let old_ranges_len = ranges.len();
 
-                    ranges.retain(|r| r.contains(value));
+                    ranges.retain(|r| r.contains(&value));
 
                     if ranges.len() != old_ranges_len {
                         state.set_dirty();

src/parser.rs

@@ -19,7 +19,7 @@ use crate::types::StringsInterner;
 use crate::{
     calc_fn_hash, Dynamic, Engine, EvalAltResult, EvalContext, ExclusiveRange, FnArgsVec,
     Identifier, ImmutableString, InclusiveRange, LexError, OptimizationLevel, ParseError, Position,
-    Scope, Shared, SmartString, StaticVec, AST, INT, PERR,
+    Scope, Shared, SmartString, StaticVec, AST, PERR,
 };
 use bitflags::bitflags;
 #[cfg(feature = "no_std")]
@@ -42,9 +42,6 @@ const SCOPE_SEARCH_BARRIER_MARKER: &str = "$ BARRIER $";
 /// The message: `TokenStream` never ends
 const NEVER_ENDS: &str = "`Token`";
 
-/// Unroll `switch` ranges no larger than this.
-const SMALL_SWITCH_RANGE: INT = 16;
-
 /// _(internals)_ A type that encapsulates the current state of the parser.
 /// Exported under the `internals` feature only.
 pub struct ParseState<'e, 's> {
@@ -1216,7 +1213,6 @@ impl Engine {
                     let stmt_block: StmtBlock = stmt.into();
                     (Expr::Stmt(stmt_block.into()), need_comma)
                 };
-            let has_condition = !matches!(condition, Expr::BoolConstant(true, ..));
 
             expressions.push((condition, action_expr).into());
             let index = expressions.len() - 1;
@@ -1240,24 +1236,10 @@ impl Engine {
 
                     if let Some(mut r) = range_value {
                         if !r.is_empty() {
-                            // Do not unroll ranges if there are previous non-unrolled ranges
-                            if !has_condition && ranges.is_empty() && r.len() <= SMALL_SWITCH_RANGE
-                            {
-                                // Unroll small range
-                                r.into_iter().for_each(|n| {
-                                    let hasher = &mut get_hasher();
-                                    Dynamic::from_int(n).hash(hasher);
-                                    cases
-                                        .entry(hasher.finish())
-                                        .and_modify(|cases| cases.push(index))
-                                        .or_insert_with(|| [index].into());
-                                });
-                            } else {
                             // Other range
                             r.set_index(index);
                             ranges.push(r);
                         }
-                        }
                         continue;
                     }
 

tests/expressions.rs

@@ -50,8 +50,8 @@ fn test_expressions() -> Result<(), Box<EvalAltResult>> {
             "
                 switch x {
                     0 => 1,
-                    1..10 => 123,
                     10 => 42,
+                    1..10 => 123,
                 }
             "
         )?,
@@ -63,11 +63,11 @@ fn test_expressions() -> Result<(), Box<EvalAltResult>> {
             "
                 switch x {
                     0 => 1,
+                    10 => 42,
                     1..10 => {
                         let y = 123;
                         y
                     }
-                    10 => 42,
                 }
             "
         )