Fix potential line splitting issue in raw (#2674)

crates/typst-library/src/text/raw.rs

@@ -9,7 +9,7 @@ use syntect::highlighting as synt;
 use syntect::parsing::{SyntaxDefinition, SyntaxSet, SyntaxSetBuilder};
 use typst::diag::FileError;
 use typst::eval::Bytes;
-use typst::syntax::{self, is_newline, LinkedNode};
+use typst::syntax::{self, split_newlines, LinkedNode};
 use typst::util::option_eq;
 use unicode_segmentation::UnicodeSegmentation;
 
@@ -291,7 +291,8 @@ impl Synthesize for RawElem {
             text = align_tabs(&text, tab_size);
         }
 
-        let count = text.lines().count() as i64;
+        let lines = split_newlines(&text);
+        let count = lines.len() as i64;
 
         let lang = self
             .lang(styles)
@@ -348,7 +349,7 @@ impl Synthesize for RawElem {
                 })
         }) {
             let mut highlighter = syntect::easy::HighlightLines::new(syntax, theme);
-            for (i, line) in text.lines().enumerate() {
+            for (i, line) in lines.into_iter().enumerate() {
                 let mut line_content = vec![];
                 for (style, piece) in
                     highlighter.highlight_line(line, syntax_set).into_iter().flatten()
@@ -367,8 +368,7 @@ impl Synthesize for RawElem {
                 );
             }
         } else {
-            let lines = text.lines();
-            seq.extend(lines.enumerate().map(|(i, line)| {
+            seq.extend(lines.into_iter().enumerate().map(|(i, line)| {
                 RawLine::new(
                     i as i64 + 1,
                     count,
@@ -562,7 +562,7 @@ impl<'a> ThemedHighlighter<'a> {
             let segment = &self.code[self.node.range()];
 
             let mut len = 0;
-            for (i, line) in segment.split(is_newline).enumerate() {
+            for (i, line) in split_newlines(segment).into_iter().enumerate() {
                 if i != 0 {
                     (self.line_fn)(
                         self.line,

crates/typst-syntax/src/lexer.rs

@@ -673,7 +673,7 @@ pub fn link_prefix(text: &str) -> (&str, bool) {
 }
 
 /// Split text at newlines.
-pub(super) fn split_newlines(text: &str) -> Vec<&str> {
+pub fn split_newlines(text: &str) -> Vec<&str> {
     let mut s = Scanner::new(text);
     let mut lines = Vec::new();
     let mut start = 0;

crates/typst-syntax/src/lib.rs

@@ -15,11 +15,13 @@ mod span;
 pub use self::file::{FileId, PackageSpec, PackageVersion, VirtualPath};
 pub use self::highlight::{highlight, highlight_html, Tag};
 pub use self::kind::SyntaxKind;
-pub use self::lexer::{is_id_continue, is_id_start, is_ident, is_newline, link_prefix};
+pub use self::lexer::{
+    is_id_continue, is_id_start, is_ident, is_newline, link_prefix, split_newlines,
+};
 pub use self::node::{LinkedChildren, LinkedNode, SyntaxError, SyntaxNode};
 pub use self::parser::{parse, parse_code, parse_math};
 pub use self::source::Source;
 pub use self::span::{Span, Spanned};
 
-use self::lexer::{split_newlines, LexMode, Lexer};
+use self::lexer::{LexMode, Lexer};
 use self::parser::{reparse_block, reparse_markup};