Update Q000, Q001 with the new f-string tokens (#7589)

## Summary

This PR updates the `Q000`, and `Q001` rules to consider the new
f-string tokens. The docstring rule (`Q002`) doesn't need to be updated
because f-strings cannot be used as docstrings.

I tried implementing the nested f-string support but there are still
some edge cases in my current implementation so I've decided to pause it
for now and I'll pick it up sometime soon. So, for now this doesn't
support nested f-strings.

### Implementation

The implementation uses the same `FStringRangeBuilder` introduced in
#7586 to build up the outermost f-string range. The reason to use the
same implementation is because this is a temporary solution until we add
support for nested f-strings.

## Test Plan

`cargo test`

crates/ruff_linter/src/checkers/tokens.rs

@@ -127,7 +127,7 @@ pub(crate) fn check_tokens(
         Rule::BadQuotesMultilineString,
         Rule::BadQuotesDocstring,
     ]) {
-        flake8_quotes::rules::from_tokens(&mut diagnostics, tokens, locator, settings);
+        flake8_quotes::rules::check_string_quotes(&mut diagnostics, tokens, locator, settings);
     }
 
     if settings.rules.any_enabled(&[

crates/ruff_linter/src/rules/flake8_quotes/rules/from_tokens.rs → crates/ruff_linter/src/rules/flake8_quotes/rules/check_string_quotes.rs

@@ -1,6 +1,6 @@
 use ruff_python_parser::lexer::LexResult;
 use ruff_python_parser::Tok;
-use ruff_text_size::TextRange;
+use ruff_text_size::{TextRange, TextSize};
 
 use ruff_diagnostics::{AlwaysFixableViolation, Diagnostic, Edit, Fix};
 use ruff_macros::{derive_message_formats, violation};
@@ -354,8 +354,59 @@ fn strings(
     diagnostics
 }
 
+/// A builder for the f-string range.
+///
+/// For now, this is limited to the outermost f-string and doesn't support
+/// nested f-strings.
+#[derive(Debug, Default)]
+struct FStringRangeBuilder {
+    start_location: TextSize,
+    end_location: TextSize,
+    nesting: u32,
+}
+
+impl FStringRangeBuilder {
+    fn visit_token(&mut self, token: &Tok, range: TextRange) {
+        match token {
+            Tok::FStringStart => {
+                if self.nesting == 0 {
+                    self.start_location = range.start();
+                }
+                self.nesting += 1;
+            }
+            Tok::FStringEnd => {
+                self.nesting = self.nesting.saturating_sub(1);
+                if self.nesting == 0 {
+                    self.end_location = range.end();
+                }
+            }
+            _ => {}
+        }
+    }
+
+    /// Returns `true` if the lexer is currently inside of a f-string.
+    ///
+    /// It'll return `false` once the `FStringEnd` token for the outermost
+    /// f-string is visited.
+    const fn in_fstring(&self) -> bool {
+        self.nesting > 0
+    }
+
+    /// Returns the complete range of the previously visited f-string.
+    ///
+    /// This method should only be called once the lexer is outside of any
+    /// f-string otherwise it might return an invalid range.
+    ///
+    /// It doesn't consume the builder because there can be multiple f-strings
+    /// throughout the source code.
+    fn finish(&self) -> TextRange {
+        debug_assert!(!self.in_fstring());
+        TextRange::new(self.start_location, self.end_location)
+    }
+}
+
 /// Generate `flake8-quote` diagnostics from a token stream.
-pub(crate) fn from_tokens(
+pub(crate) fn check_string_quotes(
     diagnostics: &mut Vec<Diagnostic>,
     lxr: &[LexResult],
     locator: &Locator,
@@ -365,7 +416,13 @@ pub(crate) fn from_tokens(
     // concatenation, and should thus be handled as a single unit.
     let mut sequence = vec![];
     let mut state_machine = StateMachine::default();
+    let mut fstring_range_builder = FStringRangeBuilder::default();
     for &(ref tok, range) in lxr.iter().flatten() {
+        fstring_range_builder.visit_token(tok, range);
+        if fstring_range_builder.in_fstring() {
+            continue;
+        }
+
         let is_docstring = state_machine.consume(tok);
 
         // If this is a docstring, consume the existing sequence, then consume the
@@ -379,14 +436,23 @@ pub(crate) fn from_tokens(
                 diagnostics.push(diagnostic);
             }
         } else {
-            if tok.is_string() {
-                // If this is a string, add it to the sequence.
-                sequence.push(range);
-            } else if !matches!(tok, Tok::Comment(..) | Tok::NonLogicalNewline) {
-                // Otherwise, consume the sequence.
-                if !sequence.is_empty() {
-                    diagnostics.extend(strings(locator, &sequence, settings));
-                    sequence.clear();
+            match tok {
+                Tok::String { .. } => {
+                    // If this is a string, add it to the sequence.
+                    sequence.push(range);
+                }
+                Tok::FStringEnd => {
+                    // If this is the end of an f-string, add the entire f-string
+                    // range to the sequence.
+                    sequence.push(fstring_range_builder.finish());
+                }
+                Tok::Comment(..) | Tok::NonLogicalNewline => continue,
+                _ => {
+                    // Otherwise, consume the sequence.
+                    if !sequence.is_empty() {
+                        diagnostics.extend(strings(locator, &sequence, settings));
+                        sequence.clear();
+                    }
                 }
             }
         }

crates/ruff_linter/src/rules/flake8_quotes/rules/mod.rs

@@ -1,5 +1,5 @@
 pub(crate) use avoidable_escaped_quote::*;
-pub(crate) use from_tokens::*;
+pub(crate) use check_string_quotes::*;
 
 mod avoidable_escaped_quote;
-mod from_tokens;
+mod check_string_quotes;