From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:02:58 +0200
Subject: Adding upstream version 1.64.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 vendor/fluent-bundle/src/resolver/scope.rs | 141 +++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 vendor/fluent-bundle/src/resolver/scope.rs

(limited to 'vendor/fluent-bundle/src/resolver/scope.rs')

diff --git a/vendor/fluent-bundle/src/resolver/scope.rs b/vendor/fluent-bundle/src/resolver/scope.rs
new file mode 100644
index 000000000..004701137
--- /dev/null
+++ b/vendor/fluent-bundle/src/resolver/scope.rs
@@ -0,0 +1,141 @@
+use crate::bundle::FluentBundle;
+use crate::memoizer::MemoizerKind;
+use crate::resolver::{ResolveValue, ResolverError, WriteValue};
+use crate::types::FluentValue;
+use crate::{FluentArgs, FluentError, FluentResource};
+use fluent_syntax::ast;
+use std::borrow::Borrow;
+use std::fmt;
+
+/// State for a single `ResolveValue::to_value` call.
+pub struct Scope<'scope, 'errors, R, M> {
+    /// The current `FluentBundle` instance.
+    pub bundle: &'scope FluentBundle<R, M>,
+    /// The current arguments passed by the developer.
+    pub(super) args: Option<&'scope FluentArgs<'scope>>,
+    /// Local args
+    pub(super) local_args: Option<FluentArgs<'scope>>,
+    /// The running count of resolved placeables. Used to detect the Billion
+    /// Laughs and Quadratic Blowup attacks.
+    pub(super) placeables: u8,
+    /// Tracks hashes to prevent infinite recursion.
+    travelled: smallvec::SmallVec<[&'scope ast::Pattern<&'scope str>; 2]>,
+    /// Track errors accumulated during resolving.
+    pub errors: Option<&'errors mut Vec<FluentError>>,
+    /// Makes the resolver bail.
+    pub dirty: bool,
+}
+
+impl<'scope, 'errors, R, M> Scope<'scope, 'errors, R, M> {
+    pub fn new(
+        bundle: &'scope FluentBundle<R, M>,
+        args: Option<&'scope FluentArgs>,
+        errors: Option<&'errors mut Vec<FluentError>>,
+    ) -> Self {
+        Scope {
+            bundle,
+            args,
+            local_args: None,
+            placeables: 0,
+            travelled: Default::default(),
+            errors,
+            dirty: false,
+        }
+    }
+
+    pub fn add_error(&mut self, error: ResolverError) {
+        if let Some(errors) = self.errors.as_mut() {
+            errors.push(error.into());
+        }
+    }
+
+    // This method allows us to lazily add Pattern on the stack,
+    // only if the Pattern::resolve has been called on an empty stack.
+    //
+    // This is the case when pattern is called from Bundle and it
+    // allows us to fast-path simple resolutions, and only use the stack
+    // for placeables.
+    pub fn maybe_track<W>(
+        &mut self,
+        w: &mut W,
+        pattern: &'scope ast::Pattern<&str>,
+        exp: &'scope ast::Expression<&str>,
+    ) -> fmt::Result
+    where
+        R: Borrow<FluentResource>,
+        W: fmt::Write,
+        M: MemoizerKind,
+    {
+        if self.travelled.is_empty() {
+            self.travelled.push(pattern);
+        }
+        exp.write(w, self)?;
+        if self.dirty {
+            w.write_char('{')?;
+            exp.write_error(w)?;
+            w.write_char('}')
+        } else {
+            Ok(())
+        }
+    }
+
+    pub fn track<W>(
+        &mut self,
+        w: &mut W,
+        pattern: &'scope ast::Pattern<&str>,
+        exp: &ast::InlineExpression<&str>,
+    ) -> fmt::Result
+    where
+        R: Borrow<FluentResource>,
+        W: fmt::Write,
+        M: MemoizerKind,
+    {
+        if self.travelled.contains(&pattern) {
+            self.add_error(ResolverError::Cyclic);
+            w.write_char('{')?;
+            exp.write_error(w)?;
+            w.write_char('}')
+        } else {
+            self.travelled.push(pattern);
+            let result = pattern.write(w, self);
+            self.travelled.pop();
+            result
+        }
+    }
+
+    pub fn write_ref_error<W>(
+        &mut self,
+        w: &mut W,
+        exp: &ast::InlineExpression<&str>,
+    ) -> fmt::Result
+    where
+        W: fmt::Write,
+    {
+        self.add_error(exp.into());
+        w.write_char('{')?;
+        exp.write_error(w)?;
+        w.write_char('}')
+    }
+
+    pub fn get_arguments(
+        &mut self,
+        arguments: Option<&'scope ast::CallArguments<&'scope str>>,
+    ) -> (Vec<FluentValue<'scope>>, FluentArgs<'scope>)
+    where
+        R: Borrow<FluentResource>,
+        M: MemoizerKind,
+    {
+        if let Some(ast::CallArguments { positional, named }) = arguments {
+            let positional = positional.iter().map(|expr| expr.resolve(self)).collect();
+
+            let named = named
+                .iter()
+                .map(|arg| (arg.name.name, arg.value.resolve(self)))
+                .collect();
+
+            (positional, named)
+        } else {
+            (Vec::new(), FluentArgs::new())
+        }
+    }
+}
-- 
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