frontmatter: fences are now limited to 255 dashes

mattheww · mattheww · commit b62e2bbdaaac · 2025-12-05T16:57:30.000Z
See rust-lang/rust#149358
diff --git a/src/framework/testcases.rs b/src/framework/testcases.rs
@@ -1493,7 +1493,7 @@ pub const LONGLIST: &[&str] = [
     "---\n---\nident",
     "---\nfront matter\n---\nident",
     "----\nfront matter\n----\nident",
-    "----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------\nfront matter\n----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------\nident",
+    "-----------------\nfront matter\n-----------------\nident",
     "---\r\nfront matter\r\n---\r\nident",
 
     // What follows the frontmatter
@@ -1577,6 +1577,11 @@ pub const LONGLIST: &[&str] = [
     "----\n🦀---\n ---\nident", // #146847
     "---🦀--- ---", // Minimal case of #146847
 
+    // Length limit
+    "--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------\nfront matter\n--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------\nident",
+    "---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------\nfront matter\n---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------\nident",
+    "----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------\nfront matter\n----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------\nident",
+
     // What's before the frontmatter
     "ident\n---\nfront matter\n---\nident",
     "ident---\nfront matter\n---\nident",
diff --git a/src/reimplementation/cleaning/frontmatter.pest b/src/reimplementation/cleaning/frontmatter.pest
@@ -30,7 +30,7 @@ END_LINE = {
     ( LF | EOI )
 }
 
-FENCE = { "---" ~ "-" * }
+FENCE = { "-" {3, 255} }
 
 INFOSTRING = {
     ( XID_START | "_" ) ~
diff --git a/writeup/raw_strings.md b/writeup/raw_strings.md
@@ -106,9 +106,6 @@ RDQ_255_CONTENT = {
 
 ```
 
-This approach wouldn't help for frontmatter fences,
-which don't have a length limit.
-
 
 [rdql-token]: string_and_byte_literal_tokens.html#rdql
 [pest-stack]: https://docs.rs/pest/2.8.0/pest/#special-rules

Original file line number	Diff line number	Diff line change
`@@ -30,7 +30,7 @@ END_LINE = {`
`30`	`30`	`( LF \| EOI )`
`31`	`31`	`}`
`32`	`32`
`33`		`-FENCE = { "---" ~ "-" * }`
	`33`	`+FENCE = { "-" {3, 255} }`
`34`	`34`
`35`	`35`	`INFOSTRING = {`
`36`	`36`	`( XID_START \| "_" ) ~`