range operator accepts bot..=top as well as bot..top (#8382)

# Description

A compromise fix for #8162. Nushell range operator now accepts `..=` to
mean the range includes the top value, so you can use your Rust habits.
But the unadorned `..` range operator also includes the value, so you
can also use your Nushell habits.

_(Description of your pull request goes here. **Provide examples and/or
screenshots** if your changes affect the user experience.)_

```nushell
〉1..5
╭───┬───╮
│ 0 │ 1 │
│ 1 │ 2 │
│ 2 │ 3 │
│ 3 │ 4 │
│ 4 │ 5 │
╰───┴───╯
-------------------------------------------- /home/bobhy/src/rust/nushell --------------------------------------------
〉1..=5
╭───┬───╮
│ 0 │ 1 │
│ 1 │ 2 │
│ 2 │ 3 │
│ 3 │ 4 │
│ 4 │ 5 │
╰───┴───╯
-------------------------------------------- /home/bobhy/src/rust/nushell --------------------------------------------
〉1..<5
╭───┬───╮
│ 0 │ 1 │
│ 1 │ 2 │
│ 2 │ 3 │
│ 3 │ 4 │
╰───┴───╯
```
# User-Facing Changes

Existing scripts with range operator will continue to operate as
heretofore.

_(List of all changes that impact the user experience here. This helps
us keep track of breaking changes.)_

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- [x] `cargo fmt --all -- --check` to check standard code formatting
(`cargo fmt --all` applies these changes)
- [x] `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- [x] `cargo test --workspace` to check that all tests pass

# After Submitting

Will update the book to include new syntax.

Cargo.lock

@@ -2708,7 +2708,7 @@ dependencies = [
  "pretty_assertions",
  "rayon",
  "reedline",
- "rstest",
+ "rstest 0.17.0",
  "serde_json",
  "serial_test",
  "signal-hook",
@@ -2751,7 +2751,7 @@ dependencies = [
  "once_cell",
  "percent-encoding",
  "reedline",
- "rstest",
+ "rstest 0.17.0",
  "sysinfo 0.28.2",
  "thiserror",
 ]
@@ -2863,7 +2863,7 @@ dependencies = [
  "reedline",
  "regex",
  "roxmltree",
- "rstest",
+ "rstest 0.17.0",
  "rusqlite",
  "rust-embed",
  "same-file",
@@ -2954,6 +2954,7 @@ dependencies = [
  "nu-path",
  "nu-plugin",
  "nu-protocol",
+ "rstest 0.16.0",
  "serde_json",
  "thiserror",
 ]
@@ -4348,16 +4349,40 @@ dependencies = [
  "xmlparser",
 ]
 
+[[package]]
+name = "rstest"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b07f2d176c472198ec1e6551dc7da28f1c089652f66a7b722676c2238ebc0edf"
+dependencies = [
+ "rstest_macros 0.16.0",
+ "rustc_version",
+]
+
 [[package]]
 name = "rstest"
 version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "de1bb486a691878cd320c2f0d319ba91eeaa2e894066d8b5f8f117c000e9d962"
 dependencies = [
- "rstest_macros",
+ "rstest_macros 0.17.0",
  "rustc_version",
 ]
 
+[[package]]
+name = "rstest_macros"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7229b505ae0706e64f37ffc54a9c163e11022a6636d58fe1f3f52018257ff9f7"
+dependencies = [
+ "cfg-if 1.0.0",
+ "proc-macro2",
+ "quote",
+ "rustc_version",
+ "syn 1.0.109",
+ "unicode-ident",
+]
+
 [[package]]
 name = "rstest_macros"
 version = "0.17.0"

crates/nu-parser/Cargo.toml

@@ -23,5 +23,8 @@ nu-plugin = { path = "../nu-plugin", optional = true, version = "0.78.1"  }
 nu-engine = { path = "../nu-engine", version = "0.78.1" }
 log = "0.4"
 
+[dev-dependencies]
+rstest = { version = "0.16.0", default-features = false }
+
 [features]
 plugin = ["nu-plugin"]

crates/nu-parser/src/parser.rs

@@ -1500,7 +1500,7 @@ pub fn parse_range(
 
     // Range follows the following syntax: [<from>][<next_operator><next>]<range_operator>[<to>]
     //   where <next_operator> is ".."
-    //   and  <range_operator> is ".." or "..<"
+    //   and  <range_operator> is "..", "..=" or "..<"
     //   and one of the <from> or <to> bounds must be present (just '..' is not allowed since it
     //     looks like parent directory)
     //bugbug range cannot be [..] because that looks like parent directory
@@ -1553,12 +1553,12 @@ pub fn parse_range(
             return garbage(span);
         }
     } else {
-        let op_str = "..";
+        let op_str = if token.contains("..=") { "..=" } else { ".." };
         let op_span = Span::new(
             span.start + range_op_pos,
             span.start + range_op_pos + op_str.len(),
         );
-        (RangeInclusion::Inclusive, "..", op_span)
+        (RangeInclusion::Inclusive, op_str, op_span)
     };
 
     // Now, based on the operator positions, figure out where the bounds & next are located and
@@ -5178,7 +5178,12 @@ pub fn parse_expression(
 
         let split = name.splitn(2, |x| *x == b'=');
         let split: Vec<_> = split.collect();
-        if !name.starts_with(b"^") && split.len() == 2 && !split[0].is_empty() {
+        if !name.starts_with(b"^")
+            && split.len() == 2
+            && !split[0].is_empty()
+            && !split[0].ends_with(b"..")
+        // was range op ..=
+        {
             let point = split[0].len() + 1;
 
             let starting_error_count = working_set.parse_errors.len();

crates/nu-parser/tests/test_parser.rs

@@ -6,6 +6,7 @@ use nu_protocol::{
     engine::{Command, EngineState, Stack, StateWorkingSet},
     ParseError, PipelineData, ShellError, Signature, SyntaxShape,
 };
+use rstest::rstest;
 
 #[cfg(test)]
 #[derive(Clone)]
@@ -974,334 +975,267 @@ mod range {
     use super::*;
     use nu_protocol::ast::{RangeInclusion, RangeOperator};
 
-    #[test]
-    fn parse_inclusive_range() {
+    #[rstest]
+    #[case(b"0..10", RangeInclusion::Inclusive, "inclusive")]
+    #[case(b"0..=10", RangeInclusion::Inclusive, "=inclusive")]
+    #[case(b"0..<10", RangeInclusion::RightExclusive, "exclusive")]
+    #[case(b"10..0", RangeInclusion::Inclusive, "reverse inclusive")]
+    #[case(b"10..=0", RangeInclusion::Inclusive, "reverse =inclusive")]
+    #[case(
+        b"(3 - 3)..<(8 + 2)",
+        RangeInclusion::RightExclusive,
+        "subexpression exclusive"
+    )]
+    #[case(
+        b"(3 - 3)..(8 + 2)",
+        RangeInclusion::Inclusive,
+        "subexpression inclusive"
+    )]
+    #[case(
+        b"(3 - 3)..=(8 + 2)",
+        RangeInclusion::Inclusive,
+        "subexpression =inclusive"
+    )]
+    #[case(b"-10..-3", RangeInclusion::Inclusive, "negative inclusive")]
+    #[case(b"-10..=-3", RangeInclusion::Inclusive, "negative =inclusive")]
+    #[case(b"-10..<-3", RangeInclusion::RightExclusive, "negative exclusive")]
+
+    fn parse_bounded_range(
+        #[case] phrase: &[u8],
+        #[case] inclusion: RangeInclusion,
+        #[case] tag: &str,
+    ) {
         let engine_state = EngineState::new();
         let mut working_set = StateWorkingSet::new(&engine_state);
 
-        let block = parse(&mut working_set, None, b"0..10", true, &[]);
+        let block = parse(&mut working_set, None, phrase, true, &[]);
 
         assert!(working_set.parse_errors.is_empty());
-        assert_eq!(block.len(), 1);
+        assert_eq!(block.len(), 1, "{tag}: block length");
 
         let expressions = &block[0];
-        assert_eq!(expressions.len(), 1);
-        assert!(matches!(
-            expressions[0],
-            PipelineElement::Expression(
-                _,
-                Expression {
-                    expr: Expr::Range(
+        assert_eq!(expressions.len(), 1, "{tag}: expression length");
+        if let PipelineElement::Expression(
+            _,
+            Expression {
+                expr:
+                    Expr::Range(
                         Some(_),
                         None,
                         Some(_),
                         RangeOperator {
-                            inclusion: RangeInclusion::Inclusive,
+                            inclusion: the_inclusion,
                             ..
-                        }
+                        },
                     ),
-                    ..
-                }
-            )
-        ))
+                ..
+            },
+        ) = expressions[0]
+        {
+            assert_eq!(
+                the_inclusion, inclusion,
+                "{tag}: wrong RangeInclusion {the_inclusion:?}"
+            );
+        } else {
+            panic!("{tag}: expression mismatch.")
+        };
     }
 
-    #[test]
-    fn parse_exclusive_range() {
-        let engine_state = EngineState::new();
-        let mut working_set = StateWorkingSet::new(&engine_state);
-
-        let block = parse(&mut working_set, None, b"0..<10", true, &[]);
-
-        assert!(working_set.parse_errors.is_empty());
-        assert_eq!(block.len(), 1);
-
-        let expressions = &block[0];
-        assert_eq!(expressions.len(), 1);
-        assert!(matches!(
-            expressions[0],
-            PipelineElement::Expression(
-                _,
-                Expression {
-                    expr: Expr::Range(
-                        Some(_),
-                        None,
-                        Some(_),
-                        RangeOperator {
-                            inclusion: RangeInclusion::RightExclusive,
-                            ..
-                        }
-                    ),
-                    ..
-                }
-            )
-        ))
-    }
-
-    #[test]
-    fn parse_reverse_range() {
-        let engine_state = EngineState::new();
-        let mut working_set = StateWorkingSet::new(&engine_state);
-
-        let block = parse(&mut working_set, None, b"10..0", true, &[]);
-
-        assert!(working_set.parse_errors.is_empty());
-        assert_eq!(block.len(), 1);
-
-        let expressions = &block[0];
-        assert_eq!(expressions.len(), 1);
-        assert!(matches!(
-            expressions[0],
-            PipelineElement::Expression(
-                _,
-                Expression {
-                    expr: Expr::Range(
-                        Some(_),
-                        None,
-                        Some(_),
-                        RangeOperator {
-                            inclusion: RangeInclusion::Inclusive,
-                            ..
-                        }
-                    ),
-                    ..
-                }
-            )
-        ))
-    }
-
-    #[test]
-    fn parse_subexpression_range() {
-        let engine_state = EngineState::new();
-        let mut working_set = StateWorkingSet::new(&engine_state);
-
-        let block = parse(&mut working_set, None, b"(3 - 3)..<(8 + 2)", true, &[]);
-
-        assert!(working_set.parse_errors.is_empty());
-        assert_eq!(block.len(), 1);
-
-        let expressions = &block[0];
-        assert_eq!(expressions.len(), 1);
-        assert!(matches!(
-            expressions[0],
-            PipelineElement::Expression(
-                _,
-                Expression {
-                    expr: Expr::Range(
-                        Some(_),
-                        None,
-                        Some(_),
-                        RangeOperator {
-                            inclusion: RangeInclusion::RightExclusive,
-                            ..
-                        }
-                    ),
-                    ..
-                }
-            )
-        ))
-    }
-
-    #[test]
-    fn parse_variable_range() {
+    #[rstest]
+    #[case(
+        b"let a = 2; $a..10",
+        RangeInclusion::Inclusive,
+        "variable start inclusive"
+    )]
+    #[case(
+        b"let a = 2; $a..=10",
+        RangeInclusion::Inclusive,
+        "variable start =inclusive"
+    )]
+    #[case(
+        b"let a = 2; $a..<($a + 10)",
+        RangeInclusion::RightExclusive,
+        "subexpression variable exclusive"
+    )]
+    fn parse_variable_range(
+        #[case] phrase: &[u8],
+        #[case] inclusion: RangeInclusion,
+        #[case] tag: &str,
+    ) {
         let engine_state = EngineState::new();
         let mut working_set = StateWorkingSet::new(&engine_state);
 
         working_set.add_decl(Box::new(Let));
 
-        let block = parse(&mut working_set, None, b"let a = 2; $a..10", true, &[]);
+        let block = parse(&mut working_set, None, phrase, true, &[]);
 
         assert!(working_set.parse_errors.is_empty());
-        assert_eq!(block.len(), 2);
+        assert_eq!(block.len(), 2, "{tag} block len 2");
 
         let expressions = &block[1];
-        assert_eq!(expressions.len(), 1);
-        assert!(matches!(
-            expressions[0],
-            PipelineElement::Expression(
-                _,
-                Expression {
-                    expr: Expr::Range(
+        assert_eq!(expressions.len(), 1, "{tag}: expression length 1");
+        if let PipelineElement::Expression(
+            _,
+            Expression {
+                expr:
+                    Expr::Range(
                         Some(_),
                         None,
                         Some(_),
                         RangeOperator {
-                            inclusion: RangeInclusion::Inclusive,
+                            inclusion: the_inclusion,
                             ..
-                        }
+                        },
                     ),
-                    ..
-                }
-            )
-        ))
+                ..
+            },
+        ) = expressions[0]
+        {
+            assert_eq!(
+                the_inclusion, inclusion,
+                "{tag}: wrong RangeInclusion {the_inclusion:?}"
+            );
+        } else {
+            panic!("{tag}: expression mismatch.")
+        };
     }
 
-    #[test]
-    fn parse_subexpression_variable_range() {
+    #[rstest]
+    #[case(b"0..", RangeInclusion::Inclusive, "right unbounded")]
+    #[case(b"0..=", RangeInclusion::Inclusive, "right unbounded =inclusive")]
+    #[case(b"0..<", RangeInclusion::RightExclusive, "right unbounded")]
+
+    fn parse_right_unbounded_range(
+        #[case] phrase: &[u8],
+        #[case] inclusion: RangeInclusion,
+        #[case] tag: &str,
+    ) {
         let engine_state = EngineState::new();
         let mut working_set = StateWorkingSet::new(&engine_state);
 
-        working_set.add_decl(Box::new(Let));
-
-        let block = parse(
-            &mut working_set,
-            None,
-            b"let a = 2; $a..<($a + 10)",
-            true,
-            &[],
-        );
+        let block = parse(&mut working_set, None, phrase, true, &[]);
 
         assert!(working_set.parse_errors.is_empty());
-        assert_eq!(block.len(), 2);
-
-        let expressions = &block[1];
-        assert_eq!(expressions.len(), 1);
-        assert!(matches!(
-            expressions[0],
-            PipelineElement::Expression(
-                _,
-                Expression {
-                    expr: Expr::Range(
-                        Some(_),
-                        None,
-                        Some(_),
-                        RangeOperator {
-                            inclusion: RangeInclusion::RightExclusive,
-                            ..
-                        }
-                    ),
-                    ..
-                }
-            )
-        ))
-    }
-
-    #[test]
-    fn parse_right_unbounded_range() {
-        let engine_state = EngineState::new();
-        let mut working_set = StateWorkingSet::new(&engine_state);
-
-        let block = parse(&mut working_set, None, b"0..", true, &[]);
-
-        assert!(working_set.parse_errors.is_empty());
-        assert_eq!(block.len(), 1);
+        assert_eq!(block.len(), 1, "{tag}: block len 1");
 
         let expressions = &block[0];
-        assert_eq!(expressions.len(), 1);
-        assert!(matches!(
-            expressions[0],
-            PipelineElement::Expression(
-                _,
-                Expression {
-                    expr: Expr::Range(
+        assert_eq!(expressions.len(), 1, "{tag}: expression length 1");
+        if let PipelineElement::Expression(
+            _,
+            Expression {
+                expr:
+                    Expr::Range(
                         Some(_),
                         None,
                         None,
                         RangeOperator {
-                            inclusion: RangeInclusion::Inclusive,
+                            inclusion: the_inclusion,
                             ..
-                        }
+                        },
                     ),
-                    ..
-                }
-            )
-        ))
+                ..
+            },
+        ) = expressions[0]
+        {
+            assert_eq!(
+                the_inclusion, inclusion,
+                "{tag}: wrong RangeInclusion {the_inclusion:?}"
+            );
+        } else {
+            panic!("{tag}: expression mismatch.")
+        };
     }
 
-    #[test]
-    fn parse_left_unbounded_range() {
+    #[rstest]
+    #[case(b"..10", RangeInclusion::Inclusive, "left unbounded inclusive")]
+    #[case(b"..=10", RangeInclusion::Inclusive, "left unbounded =inclusive")]
+    #[case(b"..<10", RangeInclusion::RightExclusive, "left unbounded exclusive")]
+
+    fn parse_left_unbounded_range(
+        #[case] phrase: &[u8],
+        #[case] inclusion: RangeInclusion,
+        #[case] tag: &str,
+    ) {
         let engine_state = EngineState::new();
         let mut working_set = StateWorkingSet::new(&engine_state);
 
-        let block = parse(&mut working_set, None, b"..10", true, &[]);
+        let block = parse(&mut working_set, None, phrase, true, &[]);
 
         assert!(working_set.parse_errors.is_empty());
-        assert_eq!(block.len(), 1);
+        assert_eq!(block.len(), 1, "{tag}: block len 1");
 
         let expressions = &block[0];
-        assert_eq!(expressions.len(), 1);
-        assert!(matches!(
-            expressions[0],
-            PipelineElement::Expression(
-                _,
-                Expression {
-                    expr: Expr::Range(
+        assert_eq!(expressions.len(), 1, "{tag}: expression length 1");
+        if let PipelineElement::Expression(
+            _,
+            Expression {
+                expr:
+                    Expr::Range(
                         None,
                         None,
                         Some(_),
                         RangeOperator {
-                            inclusion: RangeInclusion::Inclusive,
+                            inclusion: the_inclusion,
                             ..
-                        }
+                        },
                     ),
-                    ..
-                }
-            )
-        ))
+                ..
+            },
+        ) = expressions[0]
+        {
+            assert_eq!(
+                the_inclusion, inclusion,
+                "{tag}: wrong RangeInclusion {the_inclusion:?}"
+            );
+        } else {
+            panic!("{tag}: expression mismatch.")
+        };
     }
 
-    #[test]
-    fn parse_negative_range() {
+    #[rstest]
+    #[case(b"2.0..4.0..10.0", RangeInclusion::Inclusive, "float inclusive")]
+    #[case(b"2.0..4.0..=10.0", RangeInclusion::Inclusive, "float =inclusive")]
+    #[case(b"2.0..4.0..<10.0", RangeInclusion::RightExclusive, "float exclusive")]
+
+    fn parse_float_range(
+        #[case] phrase: &[u8],
+        #[case] inclusion: RangeInclusion,
+        #[case] tag: &str,
+    ) {
         let engine_state = EngineState::new();
         let mut working_set = StateWorkingSet::new(&engine_state);
 
-        let block = parse(&mut working_set, None, b"-10..-3", true, &[]);
+        let block = parse(&mut working_set, None, phrase, true, &[]);
 
         assert!(working_set.parse_errors.is_empty());
-        assert_eq!(block.len(), 1);
+        assert_eq!(block.len(), 1, "{tag}: block length 1");
 
         let expressions = &block[0];
-        assert_eq!(expressions.len(), 1);
-        assert!(matches!(
-            expressions[0],
-            PipelineElement::Expression(
-                _,
-                Expression {
-                    expr: Expr::Range(
-                        Some(_),
-                        None,
-                        Some(_),
-                        RangeOperator {
-                            inclusion: RangeInclusion::Inclusive,
-                            ..
-                        }
-                    ),
-                    ..
-                }
-            )
-        ))
-    }
-
-    #[test]
-    fn parse_float_range() {
-        let engine_state = EngineState::new();
-        let mut working_set = StateWorkingSet::new(&engine_state);
-
-        let block = parse(&mut working_set, None, b"2.0..4.0..10.0", true, &[]);
-
-        assert!(working_set.parse_errors.is_empty());
-        assert_eq!(block.len(), 1);
-
-        let expressions = &block[0];
-        assert_eq!(expressions.len(), 1);
-        assert!(matches!(
-            expressions[0],
-            PipelineElement::Expression(
-                _,
-                Expression {
-                    expr: Expr::Range(
+        assert_eq!(expressions.len(), 1, "{tag}: expression length 1");
+        if let PipelineElement::Expression(
+            _,
+            Expression {
+                expr:
+                    Expr::Range(
                         Some(_),
                         Some(_),
                         Some(_),
                         RangeOperator {
-                            inclusion: RangeInclusion::Inclusive,
+                            inclusion: the_inclusion,
                             ..
-                        }
+                        },
                     ),
-                    ..
-                }
-            )
-        ))
+                ..
+            },
+        ) = expressions[0]
+        {
+            assert_eq!(
+                the_inclusion, inclusion,
+                "{tag}: wrong RangeInclusion {the_inclusion:?}"
+            );
+        } else {
+            panic!("{tag}: expression mismatch.")
+        };
     }
 
     #[test]
@@ -1309,7 +1243,7 @@ mod range {
         let engine_state = EngineState::new();
         let mut working_set = StateWorkingSet::new(&engine_state);
 
-        parse(&mut working_set, None, b"(0)..\"a\"", true, &[]);
+        let _ = parse(&mut working_set, None, b"(0)..\"a\"", true, &[]);
 
         assert!(!working_set.parse_errors.is_empty());
     }