parse line breaks without newlines

.changeset/famous-ants-heal.md

@@ -0,0 +1,5 @@
+---
+"@nomicfoundation/slang": patch
+---
+
+parse line breaks without newlines

crates/solidity/inputs/language/src/definition.rs

@@ -392,7 +392,8 @@ codegen_language_macros::compile!(Language(
                         ),
                         Trivia(
                             name = EndOfLine,
-                            scanner = Sequence([Optional(Atom("\r")), Atom("\n")])
+                            scanner =
+                                Choice([Atom("\n"), Sequence([Atom("\r"), Optional(Atom("\n"))])])
                         ),
                         Trivia(
                             name = SingleLineComment,

crates/solidity/testing/snapshots/cst_output/SourceUnit/line_break_new_line/generated/0.4.11-success.yml

@@ -0,0 +1,13 @@
+# This file is generated automatically by infrastructure scripts. Please don't edit by hand.
+
+Source: >
+  1  │ // foo                                                                           │ 0..6
+  2  │ // bar                                                                           │ 7..13
+
+Errors: []
+
+Tree:
+  - (SourceUnit) ► (LeadingTrivia): # "// foo\r\n// bar" (0..14)
+      - (SingleLineComment): "// foo" # (0..6)
+      - (EndOfLine): "\r\n" # (6..8)
+      - (SingleLineComment): "// bar" # (8..14)

crates/solidity/testing/snapshots/cst_output/SourceUnit/line_break_new_line/input.sol

@@ -0,0 +1,2 @@
+// foo
+// bar

crates/solidity/testing/snapshots/cst_output/SourceUnit/line_break_only/generated/0.4.11-success.yml

@@ -0,0 +1,13 @@
+# This file is generated automatically by infrastructure scripts. Please don't edit by hand.
+
+Source: >
+  1  │ // foo                                                                           │ 0..6
+  2  │ // bar                                                                           │ 7..13
+
+Errors: []
+
+Tree:
+  - (SourceUnit) ► (LeadingTrivia): # "// foo\r// bar" (0..13)
+      - (SingleLineComment): "// foo" # (0..6)
+      - (EndOfLine): "\r" # (6..7)
+      - (SingleLineComment): "// bar" # (7..13)

crates/solidity/testing/snapshots/cst_output/SourceUnit/line_break_only/input.sol

@@ -0,0 +1 @@
+// foo// bar

crates/solidity/testing/utils/src/cst_snapshots/mod.rs

@@ -37,6 +37,9 @@ fn write_source(w: &mut String, source: &str) -> Result<()> {
         return Ok(());
     }
 
+    // "lines()" only handles "\n", so let's normalize all line endings:
+    let source = source.replace("\r\n", "\n").replace('\r', "\n");
+
     let line_data = source
         .lines()
         .enumerate()