Fix off-by-one error in Interpolation.spanForElement() (#2568)

Co-authored-by: Natalie Weizenbaum <nweiz@google.com>

Author: jonathan-conder

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.88.1-dev
+
+* Fix a bug when calculating source spans for interpolations.
+
 ## 1.88.0
 
 * Deprecate passing a relative URL to `compileString()` and related functions.

lib/src/ast/sass/interpolation.dart

@@ -65,7 +65,8 @@ final class Interpolation implements SassNode {
   FileSpan spanForElement(int index) => switch (contents[index]) {
         String() => span.file.span(
             (index == 0 ? span.start : spans[index - 1]!.end).offset,
-            (index == spans.length ? span.end : spans[index + 1]!.start).offset,
+            (index + 1 == spans.length ? span.end : spans[index + 1]!.start)
+                .offset,
           ),
         _ => spans[index]!,
       };

pkg/sass-parser/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.4.21-dev
+
+* No user-visible changes.
+
 ## 0.4.20
 
 * No user-visible changes.

pkg/sass-parser/package.json

@@ -1,6 +1,6 @@
 {
   "name": "sass-parser",
-  "version": "0.4.20",
+  "version": "0.4.21-dev",
   "description": "A PostCSS-compatible wrapper of the official Sass parser",
   "repository": "sass/sass",
   "author": "Google Inc.",

pkg/sass_api/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 15.5.1-dev
+
+* No user-visible changes.
+
 ## 15.5.0
 
 * No user-visible changes.

pkg/sass_api/pubspec.yaml

@@ -2,15 +2,15 @@ name: sass_api
 # Note: Every time we add a new Sass AST node, we need to bump the *major*
 # version because it's a breaking change for anyone who's implementing the
 # visitor interface(s).
-version: 15.5.0
+version: 15.5.1-dev
 description: Additional APIs for Dart Sass.
 homepage: https://github.com/sass/dart-sass
 
 environment:
   sdk: ">=3.6.0 <4.0.0"
 
 dependencies:
-  sass: 1.88.0
+  sass: 1.88.1
 
 dev_dependencies:
   dartdoc: ^8.0.14

pubspec.yaml

@@ -1,5 +1,5 @@
 name: sass
-version: 1.88.0
+version: 1.88.1-dev
 description: A Sass implementation in Dart.
 homepage: https://github.com/sass/dart-sass