fix(parser/html): allow multi line attribute values (#4018)

crates/biome_html_parser/src/lexer/mod.rs

@@ -10,7 +10,7 @@ use biome_parser::diagnostic::ParseDiagnostic;
 use biome_parser::lexer::{Lexer, LexerCheckpoint, LexerWithCheckpoint, TokenFlags};
 use biome_rowan::SyntaxKind;
 use biome_unicode_table::lookup_byte;
-use biome_unicode_table::Dispatch::{BSL, QOT, UNI, WHS};
+use biome_unicode_table::Dispatch::{BSL, QOT, UNI};
 use std::ops::Add;
 
 pub(crate) struct HtmlLexer<'src> {
@@ -246,15 +246,6 @@ impl<'src> HtmlLexer<'src> {
                         None => {}
                     }
                 }
-                WHS if matches!(chr, b'\n' | b'\r') => {
-                    let unterminated =
-                        ParseDiagnostic::new("Missing closing quote", start..self.text_position())
-                            .with_hint("The closing quote must be on the same line.");
-
-                    self.diagnostics.push(unterminated);
-
-                    return ERROR_TOKEN;
-                }
                 // we don't need to handle IDT because it's always len 1.
                 UNI => self.advance_char_unchecked(),
 

crates/biome_html_parser/tests/html_specs/ok/attributes/multiline-attribute-value.html

@@ -0,0 +1,2 @@
+<div class="foo
+bar baz">foo</div>

crates/biome_html_parser/tests/html_specs/ok/attributes/multiline-attribute-value.html.snap

@@ -0,0 +1,93 @@
+---
+source: crates/biome_html_parser/tests/spec_test.rs
+expression: snapshot
+---
+## Input
+
+```html
+<div class="foo
+bar baz">foo</div>
+
+```
+
+
+## AST
+
+```
+HtmlRoot {
+    bom_token: missing (optional),
+    directive: missing (optional),
+    html: HtmlElementList [
+        HtmlElement {
+            opening_element: HtmlOpeningElement {
+                l_angle_token: L_ANGLE@0..1 "<" [] [],
+                name: HtmlName {
+                    value_token: HTML_LITERAL@1..5 "div" [] [Whitespace(" ")],
+                },
+                attributes: HtmlAttributeList [
+                    HtmlAttribute {
+                        name: HtmlName {
+                            value_token: HTML_LITERAL@5..10 "class" [] [],
+                        },
+                        initializer: HtmlAttributeInitializerClause {
+                            eq_token: EQ@10..11 "=" [] [],
+                            value: HtmlString {
+                                value_token: HTML_STRING_LITERAL@11..24 "\"foo\nbar baz\"" [] [],
+                            },
+                        },
+                    },
+                ],
+                r_angle_token: R_ANGLE@24..25 ">" [] [],
+            },
+            children: HtmlElementList [
+                HtmlContent {
+                    value_token: HTML_LITERAL@25..28 "foo" [] [],
+                },
+            ],
+            closing_element: HtmlClosingElement {
+                l_angle_token: L_ANGLE@28..29 "<" [] [],
+                slash_token: SLASH@29..30 "/" [] [],
+                name: HtmlName {
+                    value_token: HTML_LITERAL@30..33 "div" [] [],
+                },
+                r_angle_token: R_ANGLE@33..34 ">" [] [],
+            },
+        },
+    ],
+    eof_token: EOF@34..35 "" [Newline("\n")] [],
+}
+```
+
+## CST
+
+```
+0: [email protected]
+  0: (empty)
+  1: (empty)
+  2: [email protected]
+    0: [email protected]
+      0: [email protected]
+        0: [email protected] "<" [] []
+        1: [email protected]
+          0: [email protected] "div" [] [Whitespace(" ")]
+        2: [email protected]
+          0: [email protected]
+            0: [email protected]
+              0: [email protected] "class" [] []
+            1: [email protected]
+              0: [email protected] "=" [] []
+              1: [email protected]
+                0: [email protected] "\"foo\nbar baz\"" [] []
+        3: [email protected] ">" [] []
+      1: [email protected]
+        0: [email protected]
+          0: [email protected] "foo" [] []
+      2: [email protected]
+        0: [email protected] "<" [] []
+        1: [email protected] "/" [] []
+        2: [email protected]
+          0: [email protected] "div" [] []
+        3: [email protected] ">" [] []
+  3: [email protected] "" [Newline("\n")] []
+
+```