Merge pull request #304 from Kijewski/pr-excessive-filter-block

parser: fix excessive filter blocks

fuzzing/fuzz/src/all.rs

@@ -29,6 +29,14 @@ macro_rules! this_file {
             }
         }
 
+        impl fmt::Display for Scenario<'_> {
+            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+                match self {
+                    $(Self::$ty(scenario) => fmt::Display::fmt(scenario, f),)*
+                }
+            }
+        }
+
         #[derive(Arbitrary)]
         enum Target {
             $($ty,)*

fuzzing/fuzz/src/filters.rs

@@ -1,3 +1,5 @@
+use std::fmt;
+
 use arbitrary::{Arbitrary, Unstructured};
 use rinja::filters;
 
@@ -44,6 +46,42 @@ fn run_text(filter: Text<'_>) -> Result<(), rinja::Error> {
     Ok(())
 }
 
+impl fmt::Display for Scenario<'_> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let Scenario::Text(Text { input, filter }) = self;
+        let text = match filter {
+            TextFilter::Capitalize => format!("capitalize({input:?})"),
+            TextFilter::Center(a) => format!("center({input:?}, {a:?})"),
+            TextFilter::Indent(a) => format!("indent({input:?}, {a:?})"),
+            TextFilter::Linebreaks => format!("linebreaks({input:?})"),
+            TextFilter::LinebreaksBr => format!("linebreaksbr({input:?})"),
+            TextFilter::Lowercase => format!("lowercase({input:?})"),
+            TextFilter::ParagraphBreaks => format!("paragraphbreaks({input:?})"),
+            TextFilter::Safe(e) => match e {
+                Escaper::Html => format!("safe({input:?}, filters::Html)"),
+                Escaper::Text => format!("safe({input:?}, filters::Text)"),
+            },
+            TextFilter::Title => format!("title({input:?})"),
+            TextFilter::Trim => format!("trim({input:?})"),
+            TextFilter::Truncate(a) => format!("truncate({input:?}, {a:?})"),
+            TextFilter::Uppercase => format!("uppercase({input:?})"),
+            TextFilter::Urlencode => format!("urlencode({input:?})"),
+            TextFilter::UrlencodeStrict => format!("urlencode_strict({input:?})"),
+        };
+        write!(
+            f,
+            "\
+use rinja::filters;
+
+#[test]
+fn test() {{
+    let _: String = filters::{text}?.to_string();
+}}\
+            ",
+        )
+    }
+}
+
 #[derive(Arbitrary, Debug, Clone, Copy)]
 pub struct Text<'a> {
     input: &'a str,

fuzzing/fuzz/src/html/mod.rs

@@ -1,6 +1,8 @@
 #[allow(clippy::module_inception)]
 mod html;
 
+use std::fmt;
+
 use arbitrary::{Arbitrary, Unstructured};
 use html_escape::decode_html_entities_to_string;
 
@@ -41,3 +43,45 @@ impl<'a> super::Scenario<'a> for Scenario<'a> {
         Ok(())
     }
 }
+
+impl fmt::Display for Scenario<'_> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            Scenario::String(src) => {
+                write!(
+                    f,
+                    "\
+#[test]
+fn test() {{
+    let mut dest = String::with_capacity({len});
+    html::write_escaped_str(&mut dest, {src:?}).unwrap();
+
+    let mut unescaped = String::with_capacity(src.len());
+    let unescaped = html_escape::decode_html_entities_to_string(dest, &mut unescaped);
+    assert_eq!(src, unescaped);
+}}\
+                    ",
+                    len = src.len(),
+                )
+            }
+            Scenario::Char(c) => {
+                write!(
+                    f,
+                    "\
+#[test]
+fn test() {{
+    let mut dest = String::with_capacity(6);
+    html::write_escaped_char(&mut dest, {c:?}).unwrap();
+
+    let mut src = [0; 4];
+    let src = c.encode_utf8(&mut src);
+    let mut unescaped = String::with_capacity(4);
+    let unescaped = decode_html_entities_to_string(dest, &mut unescaped);
+    assert_eq!(src, unescaped);
+}}\
+                    ",
+                )
+            }
+        }
+    }
+}

fuzzing/fuzz/src/lib.rs

@@ -23,7 +23,7 @@ pub const TARGETS: &[(&str, TargetBuilder)] = &[
 
 pub type TargetBuilder = for<'a> fn(&'a [u8]) -> Result<NamedTarget<'a>, arbitrary::Error>;
 
-pub trait Scenario<'a>: fmt::Debug + Sized {
+pub trait Scenario<'a>: fmt::Debug + fmt::Display + Sized {
     type RunError: Error + Send + 'static;
 
     fn fuzz(data: &'a [u8]) -> Result<(), FuzzError<Self::RunError>> {
@@ -76,6 +76,13 @@ impl fmt::Debug for NamedTarget<'_> {
     }
 }
 
+impl fmt::Display for NamedTarget<'_> {
+    #[inline]
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.as_test(f)
+    }
+}
+
 impl<'a> NamedTarget<'a> {
     #[inline]
     fn new<S: Scenario<'a> + 'a>(data: &'a [u8]) -> Result<Self, arbitrary::Error> {
@@ -86,13 +93,20 @@ impl<'a> NamedTarget<'a> {
 trait RunScenario<'a> {
     fn debug(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result;
 
+    fn as_test(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result;
+
     fn run(&self) -> Result<(), Box<dyn Error + Send + 'static>>;
 }
 
 impl<'a, T: Scenario<'a>> RunScenario<'a> for T {
     #[inline]
     fn debug(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.fmt(f)
+        fmt::Debug::fmt(self, f)
+    }
+
+    #[inline]
+    fn as_test(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Display::fmt(self, f)
     }
 
     #[inline]

fuzzing/fuzz/src/parser.rs

@@ -1,5 +1,8 @@
+use std::borrow::Cow;
+use std::fmt;
+
 use arbitrary::{Arbitrary, Unstructured};
-use rinja_parser::{Ast, Syntax, SyntaxBuilder};
+use rinja_parser::{Ast, InnerSyntax, Syntax, SyntaxBuilder};
 
 #[derive(Debug, Default)]
 pub struct Scenario<'a> {
@@ -36,7 +39,50 @@ impl<'a> super::Scenario<'a> for Scenario<'a> {
 
     fn run(&self) -> Result<(), Self::RunError> {
         let Scenario { syntax, src } = self;
-        Ast::from_str(src, None, syntax)?;
+        let _: Ast<'_> = Ast::from_str(src, None, syntax)?;
         Ok(())
     }
 }
+
+impl fmt::Display for Scenario<'_> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let Scenario { syntax, src } = self;
+        let syntax = if *syntax == Syntax::default() {
+            Cow::Borrowed("Syntax::default()")
+        } else {
+            let InnerSyntax {
+                block_start,
+                block_end,
+                expr_start,
+                expr_end,
+                comment_start,
+                comment_end,
+            } = **syntax;
+            Cow::Owned(format!(
+                "\
+SyntaxBuilder {{
+        name: \"test\",
+        block_start: {block_start:?},
+        block_end: {block_end:?},
+        expr_start: {expr_start:?},
+        expr_end: {expr_end:?},
+        comment_start: {comment_start:?},
+        comment_end: {comment_end:?},
+    }}.to_syntax().unwrap()",
+            ))
+        };
+        write!(
+            f,
+            "\
+use rinja_parser::{{Ast, ParseError}};
+
+#[test]
+fn test() -> Result<(), ParseError> {{
+    let src = {src:?};
+    let syntax = {syntax};
+    Ast::from_str(src, None, &syntax).map(|_| ())
+}}\
+            ",
+        )
+    }
+}

fuzzing/src/main.rs

@@ -1,6 +1,6 @@
 use std::env::args_os;
 use std::fs::OpenOptions;
-use std::io::Read;
+use std::io::{Read, Write, stdin};
 use std::path::{Path, PathBuf};
 
 use fuzz::{DisplayTargets, TARGETS};
@@ -9,10 +9,11 @@ fn main() -> Result<(), Error> {
     let mut args = args_os().fuse();
     let exe = args.next().map(PathBuf::from);
     let name = args.next().and_then(|s| s.into_string().ok());
-    let path = args.next().map(PathBuf::from);
+    let src = args.next().map(PathBuf::from);
+    let dest = args.next().map(PathBuf::from);
     let empty = args.next().map(|_| ());
 
-    let (Some(name), Some(path), None) = (name, path, empty) else {
+    let (Some(name), Some(src), None) = (name, src, empty) else {
         return Err(Error::Usage(exe));
     };
 
@@ -22,37 +23,62 @@ fn main() -> Result<(), Error> {
         .ok_or(Error::Target(name))?;
 
     let mut data = Vec::new();
-    match OpenOptions::new().read(true).open(Path::new(&path)) {
-        Ok(mut f) => {
-            f.read_to_end(&mut data)
-                .map_err(|err| Error::Read(err, path))?;
+    if src == Path::new("-") {
+        stdin().read_to_end(&mut data).map_err(Error::Stdin)?;
+    } else {
+        match OpenOptions::new().read(true).open(Path::new(&src)) {
+            Ok(mut f) => {
+                f.read_to_end(&mut data)
+                    .map_err(|err| Error::Read(err, src))?;
+            }
+            Err(err) => return Err(Error::Open(err, src)),
         }
-        Err(err) => return Err(Error::Open(err, path)),
-    };
+    }
 
     let scenario = scenario_builder(&data).map_err(Error::Build)?;
-    eprintln!("{scenario:#?}");
-    scenario.run().map_err(Error::Run)?;
-    println!("Success.");
-
+    if let Some(dest) = dest {
+        if dest == Path::new("-") {
+            println!("{scenario}");
+        } else {
+            let mut f = match OpenOptions::new().write(true).create_new(true).open(&dest) {
+                Ok(f) => f,
+                Err(err) => return Err(Error::DestOpen(err, dest)),
+            };
+            writeln!(f, "{scenario}").map_err(|err| Error::DestWrite(err, dest))?;
+        }
+    } else {
+        eprintln!("{scenario:#?}");
+        scenario.run().map_err(Error::Run)?;
+        println!("Success.");
+    }
     Ok(())
 }
 
 #[derive(thiserror::Error, pretty_error_debug::Debug)]
 enum Error {
     #[error(
-        "wrong arguments supplied\nUsage: {} <{DisplayTargets}> <path>",
+        "wrong arguments supplied\n\
+        Usage: {} <target> <src> [<dest>]\n\
+        * <target>   {DisplayTargets}\n\
+        * <src>      failed scenario (supply '-' to from from STDIN)\n\
+        * <dest>     write a #[test] to this file (optional; supply '-' to write to STDOUT)",
         .0.as_deref().unwrap_or(Path::new("rinja_fuzzing")).display(),
     )]
     Usage(Option<PathBuf>),
     #[error("unknown fuzzing target {:?}\nImplemented targets: {DisplayTargets}", .0)]
     Target(String),
-    #[error("could not open input file {}", .1.display())]
+    #[error("could not read standard input")]
+    Stdin(#[source] std::io::Error),
+    #[error("could not open input file {:?}", .1.display())]
     Open(#[source] std::io::Error, PathBuf),
-    #[error("could not read opened input file {}", .1.display())]
+    #[error("could not read opened input file {:?}", .1.display())]
     Read(#[source] std::io::Error, PathBuf),
     #[error("could not build scenario")]
     Build(#[source] arbitrary::Error),
     #[error("could not run scenario")]
     Run(#[source] Box<dyn std::error::Error + Send + 'static>),
+    #[error("could could not create destination file {:?} for writing", .1.display())]
+    DestOpen(#[source] std::io::Error, PathBuf),
+    #[error("could could not write to opened destination file {:?}", .1.display())]
+    DestWrite(#[source] std::io::Error, PathBuf),
 }

rinja_parser/src/node.rs

@@ -765,6 +765,7 @@ pub struct FilterBlock<'a> {
 impl<'a> FilterBlock<'a> {
     fn parse(i: &mut &'a str, s: &State<'_, '_>) -> ParseResult<'a, WithSpan<'a, Self>> {
         let start_s = *i;
+        let mut level_guard = s.level.guard();
         let mut start = (
             opt(Whitespace::parse),
             ws(keyword("filter")),
@@ -774,6 +775,8 @@ impl<'a> FilterBlock<'a> {
                     ws(identifier),
                     opt(|i: &mut _| Expr::arguments(i, s.level, false)),
                     repeat(0.., |i: &mut _| {
+                        #[allow(clippy::explicit_auto_deref)] // false positive
+                        level_guard.nest(*i)?;
                         let start = *i;
                         filter(i, s.level).map(|(name, params)| (name, params, start))
                     })

rinja_parser/src/tests.rs

@@ -1136,3 +1136,20 @@ fn fuzzed_span_is_not_substring_of_source() {
         &Syntax::default(),
     );
 }
+
+#[test]
+fn fuzzed_excessive_filter_block() {
+    let src = include_str!("../tests/excessive_filter_block.txt");
+    let err = Ast::from_str(src, None, &Syntax::default()).unwrap_err();
+    assert_eq!(
+        err.to_string().lines().next(),
+        Some("your template code is too deeply nested, or the last expression is too complex"),
+    );
+
+    let src = include!("../tests/fuzzed_excessive_filter_block.inc");
+    let err = Ast::from_str(src, None, &Syntax::default()).unwrap_err();
+    assert_eq!(
+        err.to_string().lines().next(),
+        Some("your template code is too deeply nested, or the last expression is too complex"),
+    );
+}

rinja_parser/tests/excessive_filter_block.txt

@@ -0,0 +1,50 @@
+{% filter x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
+x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|
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