Expose u32 source offsets as usize

Computations should use usize, so this makes things more convenient.
Post-FFI we can make SourceRange fields private, to enforce this even easier.

fish-rust/src/ast.rs

@@ -141,8 +141,7 @@ pub trait Node: Acceptor + ConcreteNode + std::fmt::Debug {
 
     /// \return the source code for this node, or none if unsourced.
     fn try_source<'s>(&self, orig: &'s wstr) -> Option<&'s wstr> {
-        self.try_source_range()
-            .map(|r| &orig[r.start as usize..r.end() as usize])
+        self.try_source_range().map(|r| &orig[r.start()..r.end()])
     }
 
     /// \return the source code for this node, or an empty string if unsourced.
@@ -2506,16 +2505,16 @@ impl<'a> TokenStream<'a> {
         result.may_be_variable_assignment = variable_assignment_equals_pos(text).is_some();
         result.tok_error = token.error;
 
-        assert!(token.offset < SOURCE_OFFSET_INVALID);
-        result.source_start = token.offset;
-        result.source_length = token.length;
+        assert!(token.offset() < SOURCE_OFFSET_INVALID);
+        result.set_source_start(token.offset());
+        result.set_source_length(token.length());
 
         if token.error != TokenizerError::none {
-            let subtoken_offset = token.error_offset_within_token;
+            let subtoken_offset = token.error_offset_within_token();
             // Skip invalid tokens that have a zero length, especially if they are at EOF.
-            if subtoken_offset < result.source_length {
-                result.source_start += subtoken_offset;
-                result.source_length = token.error_length;
+            if subtoken_offset < result.source_length() {
+                result.set_source_start(result.source_start() + subtoken_offset);
+                result.set_source_length(token.error_length());
             }
         }
 
@@ -2584,7 +2583,7 @@ macro_rules! parse_error_range {
 
             FLOG!(ast_construction, "%*sparse error - begin unwinding", $self.spaces(), "");
             // TODO: can store this conditionally dependent on flags.
-            if $range.start != SOURCE_OFFSET_INVALID {
+            if $range.start() != SOURCE_OFFSET_INVALID {
                 $self.errors.push($range);
             }
 
@@ -2592,8 +2591,8 @@ macro_rules! parse_error_range {
                 let mut err = ParseError::default();
                 err.text = text.unwrap();
                 err.code = $code;
-                err.source_start = $range.start as usize;
-                err.source_length = $range.length as usize;
+                err.source_start = $range.start();
+                err.source_length = $range.length();
                 errors.0.push(err);
             }
         }
@@ -3384,8 +3383,8 @@ impl<'s> Populator<'s> {
                         "%*schomping range %u-%u",
                         self.spaces(),
                         "",
-                        tok.source_start,
-                        tok.source_length
+                        tok.source_start(),
+                        tok.source_length()
                     );
                 }
                 FLOG!(ast_construction, "%*sdone unwinding", self.spaces(), "");

fish-rust/src/parse_constants.rs

@@ -12,7 +12,7 @@ use widestring_suffix::widestrs;
 
 pub type SourceOffset = u32;
 
-pub const SOURCE_OFFSET_INVALID: SourceOffset = SourceOffset::MAX;
+pub const SOURCE_OFFSET_INVALID: usize = SourceOffset::MAX as _;
 pub const SOURCE_LOCATION_UNKNOWN: usize = usize::MAX;
 
 #[derive(Copy, Clone)]
@@ -85,8 +85,10 @@ mod parse_constants_ffi {
     }
 
     extern "Rust" {
-        fn end(self: &SourceRange) -> u32;
-        fn contains_inclusive(self: &SourceRange, loc: u32) -> bool;
+        #[cxx_name = "end"]
+        fn end_ffi(self: &SourceRange) -> u32;
+        #[cxx_name = "contains_inclusive"]
+        fn contains_inclusive_ffi(self: &SourceRange, loc: u32) -> bool;
     }
 
     /// IMPORTANT: If the following enum table is modified you must also update token_type_description below.
@@ -245,15 +247,34 @@ pub use parse_constants_ffi::{
 };
 
 impl SourceRange {
-    pub fn new(start: SourceOffset, length: SourceOffset) -> Self {
-        SourceRange { start, length }
+    pub fn new(start: usize, length: usize) -> Self {
+        SourceRange {
+            start: start.try_into().unwrap(),
+            length: length.try_into().unwrap(),
+        }
     }
-    pub fn end(&self) -> SourceOffset {
+    pub fn start(&self) -> usize {
+        self.start.try_into().unwrap()
+    }
+    pub fn length(&self) -> usize {
+        self.length.try_into().unwrap()
+    }
+    pub fn end(&self) -> usize {
+        self.start
+            .checked_add(self.length)
+            .expect("Overflow")
+            .try_into()
+            .unwrap()
+    }
+    fn end_ffi(&self) -> u32 {
         self.start.checked_add(self.length).expect("Overflow")
     }
 
     // \return true if a location is in this range, including one-past-the-end.
-    pub fn contains_inclusive(&self, loc: SourceOffset) -> bool {
+    pub fn contains_inclusive(&self, loc: usize) -> bool {
+        self.start() <= loc && loc - self.start() <= self.length()
+    }
+    fn contains_inclusive_ffi(&self, loc: u32) -> bool {
         self.start <= loc && loc - self.start <= self.length
     }
 }

fish-rust/src/parse_tree.rs

@@ -32,8 +32,8 @@ pub struct ParseToken {
     pub may_be_variable_assignment: bool,
     /// If this is a tokenizer error, that error.
     pub tok_error: TokenizerError,
-    pub source_start: SourceOffset,
-    pub source_length: SourceOffset,
+    source_start: SourceOffset,
+    source_length: SourceOffset,
 }
 
 impl ParseToken {
@@ -46,14 +46,26 @@ impl ParseToken {
             is_newline: false,
             may_be_variable_assignment: false,
             tok_error: TokenizerError::none,
-            source_start: SOURCE_OFFSET_INVALID,
+            source_start: SOURCE_OFFSET_INVALID.try_into().unwrap(),
             source_length: 0,
         }
     }
+    pub fn set_source_start(&mut self, value: usize) {
+        self.source_start = value.try_into().unwrap();
+    }
+    pub fn source_start(&self) -> usize {
+        self.source_start.try_into().unwrap()
+    }
+    pub fn set_source_length(&mut self, value: usize) {
+        self.source_length = value.try_into().unwrap();
+    }
+    pub fn source_length(&self) -> usize {
+        self.source_length.try_into().unwrap()
+    }
     /// \return the source range.
     /// Note the start may be invalid.
     pub fn range(&self) -> SourceRange {
-        SourceRange::new(self.source_start, self.source_length)
+        SourceRange::new(self.source_start(), self.source_length())
     }
     /// \return whether we are a string with the dash prefix set.
     pub fn is_dash_prefix_string(&self) -> bool {

fish-rust/src/tokenizer.rs

@@ -269,7 +269,7 @@ impl Tok {
         Tok {
             offset: 0,
             length: 0,
-            error_offset_within_token: SOURCE_OFFSET_INVALID,
+            error_offset_within_token: SOURCE_OFFSET_INVALID.try_into().unwrap(),
             error_length: 0,
             error: TokenizerError::none,
             type_: r#type,
@@ -285,6 +285,30 @@ impl Tok {
     fn get_source_ffi(self: &Tok, str: &CxxWString) -> UniquePtr<CxxWString> {
         self.get_source(str.as_wstr()).to_ffi()
     }
+    pub fn set_offset(&mut self, value: usize) {
+        self.offset = value.try_into().unwrap();
+    }
+    pub fn offset(&self) -> usize {
+        self.offset.try_into().unwrap()
+    }
+    pub fn length(&self) -> usize {
+        self.length.try_into().unwrap()
+    }
+    pub fn set_length(&mut self, value: usize) {
+        self.length = value.try_into().unwrap();
+    }
+    pub fn set_error_offset_within_token(&mut self, value: usize) {
+        self.error_offset_within_token = value.try_into().unwrap();
+    }
+    pub fn error_offset_within_token(&self) -> usize {
+        self.error_offset_within_token.try_into().unwrap()
+    }
+    pub fn error_length(&self) -> usize {
+        self.error_length.try_into().unwrap()
+    }
+    pub fn set_error_length(&mut self, value: usize) {
+        self.error_length = value.try_into().unwrap();
+    }
 }
 
 /// The tokenizer struct.
@@ -818,8 +842,8 @@ impl Tokenizer {
         }
 
         let mut result = Tok::new(TokenType::string);
-        result.offset = buff_start as u32;
-        result.length = (self.token_cursor - buff_start) as u32;
+        result.set_offset(buff_start);
+        result.set_length(self.token_cursor - buff_start);
         result
     }
 }