Add support for specifying minimum dots in detected string imports (#19538)

## Summary

Defaults to requiring two dots, which matches the Pants default.

Cargo.lock

@@ -2960,6 +2960,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "clap",
+ "memchr",
  "ruff_cache",
  "ruff_db",
  "ruff_linter",

crates/ruff/src/args.rs

@@ -169,6 +169,9 @@ pub struct AnalyzeGraphCommand {
     /// Attempt to detect imports from string literals.
     #[clap(long)]
     detect_string_imports: bool,
+    /// The minimum number of dots in a string import to consider it a valid import.
+    #[clap(long)]
+    min_dots: Option<usize>,
     /// Enable preview mode. Use `--no-preview` to disable.
     #[arg(long, overrides_with("no_preview"))]
     preview: bool,
@@ -808,6 +811,7 @@ impl AnalyzeGraphCommand {
             } else {
                 None
             },
+            string_imports_min_dots: self.min_dots,
             preview: resolve_bool_arg(self.preview, self.no_preview).map(PreviewMode::from),
             target_version: self.target_version.map(ast::PythonVersion::from),
             ..ExplicitConfigOverrides::default()
@@ -1305,6 +1309,7 @@ struct ExplicitConfigOverrides {
     show_fixes: Option<bool>,
     extension: Option<Vec<ExtensionPair>>,
     detect_string_imports: Option<bool>,
+    string_imports_min_dots: Option<usize>,
 }
 
 impl ConfigurationTransformer for ExplicitConfigOverrides {
@@ -1392,6 +1397,9 @@ impl ConfigurationTransformer for ExplicitConfigOverrides {
         if let Some(detect_string_imports) = &self.detect_string_imports {
             config.analyze.detect_string_imports = Some(*detect_string_imports);
         }
+        if let Some(string_imports_min_dots) = &self.string_imports_min_dots {
+            config.analyze.string_imports_min_dots = Some(*string_imports_min_dots);
+        }
 
         config
     }

crates/ruff/src/commands/analyze_graph.rs

@@ -102,7 +102,7 @@ pub(crate) fn analyze_graph(
 
                 // Resolve the per-file settings.
                 let settings = resolver.resolve(path);
-                let string_imports = settings.analyze.detect_string_imports;
+                let string_imports = settings.analyze.string_imports;
                 let include_dependencies = settings.analyze.include_dependencies.get(path).cloned();
 
                 // Skip excluded files.

crates/ruff/tests/analyze_graph.rs

@@ -197,7 +197,27 @@ fn string_detection() -> Result<()> {
     insta::with_settings!({
         filters => INSTA_FILTERS.to_vec(),
     }, {
-        assert_cmd_snapshot!(command().arg("--detect-string-imports").current_dir(&root), @r###"
+        assert_cmd_snapshot!(command().arg("--detect-string-imports").current_dir(&root), @r#"
+        success: true
+        exit_code: 0
+        ----- stdout -----
+        {
+          "ruff/__init__.py": [],
+          "ruff/a.py": [
+            "ruff/b.py"
+          ],
+          "ruff/b.py": [],
+          "ruff/c.py": []
+        }
+
+        ----- stderr -----
+        "#);
+    });
+
+    insta::with_settings!({
+        filters => INSTA_FILTERS.to_vec(),
+    }, {
+        assert_cmd_snapshot!(command().arg("--detect-string-imports").arg("--min-dots").arg("1").current_dir(&root), @r#"
         success: true
         exit_code: 0
         ----- stdout -----
@@ -213,7 +233,7 @@ fn string_detection() -> Result<()> {
         }
 
         ----- stderr -----
-            "###);
+        "#);
     });
 
     Ok(())

crates/ruff/tests/lint.rs

@@ -2422,7 +2422,7 @@ requires-python = ">= 3.11"
         analyze.exclude = []
         analyze.preview = disabled
         analyze.target_version = 3.11
-        analyze.detect_string_imports = false
+        analyze.string_imports = disabled
         analyze.extension = ExtensionMapping({})
         analyze.include_dependencies = {}
 
@@ -2734,7 +2734,7 @@ requires-python = ">= 3.11"
         analyze.exclude = []
         analyze.preview = disabled
         analyze.target_version = 3.10
-        analyze.detect_string_imports = false
+        analyze.string_imports = disabled
         analyze.extension = ExtensionMapping({})
         analyze.include_dependencies = {}
 
@@ -3098,7 +3098,7 @@ from typing import Union;foo: Union[int, str] = 1
         analyze.exclude = []
         analyze.preview = disabled
         analyze.target_version = 3.11
-        analyze.detect_string_imports = false
+        analyze.string_imports = disabled
         analyze.extension = ExtensionMapping({})
         analyze.include_dependencies = {}
 
@@ -3478,7 +3478,7 @@ from typing import Union;foo: Union[int, str] = 1
         analyze.exclude = []
         analyze.preview = disabled
         analyze.target_version = 3.11
-        analyze.detect_string_imports = false
+        analyze.string_imports = disabled
         analyze.extension = ExtensionMapping({})
         analyze.include_dependencies = {}
 
@@ -3806,7 +3806,7 @@ from typing import Union;foo: Union[int, str] = 1
         analyze.exclude = []
         analyze.preview = disabled
         analyze.target_version = 3.10
-        analyze.detect_string_imports = false
+        analyze.string_imports = disabled
         analyze.extension = ExtensionMapping({})
         analyze.include_dependencies = {}
 
@@ -4134,7 +4134,7 @@ from typing import Union;foo: Union[int, str] = 1
         analyze.exclude = []
         analyze.preview = disabled
         analyze.target_version = 3.9
-        analyze.detect_string_imports = false
+        analyze.string_imports = disabled
         analyze.extension = ExtensionMapping({})
         analyze.include_dependencies = {}
 
@@ -4419,7 +4419,7 @@ from typing import Union;foo: Union[int, str] = 1
         analyze.exclude = []
         analyze.preview = disabled
         analyze.target_version = 3.9
-        analyze.detect_string_imports = false
+        analyze.string_imports = disabled
         analyze.extension = ExtensionMapping({})
         analyze.include_dependencies = {}
 
@@ -4757,7 +4757,7 @@ from typing import Union;foo: Union[int, str] = 1
         analyze.exclude = []
         analyze.preview = disabled
         analyze.target_version = 3.10
-        analyze.detect_string_imports = false
+        analyze.string_imports = disabled
         analyze.extension = ExtensionMapping({})
         analyze.include_dependencies = {}
 

crates/ruff/tests/snapshots/show_settings__display_default_settings.snap

@@ -392,7 +392,7 @@ formatter.docstring_code_line_width = dynamic
 analyze.exclude = []
 analyze.preview = disabled
 analyze.target_version = 3.7
-analyze.detect_string_imports = false
+analyze.string_imports = disabled
 analyze.extension = ExtensionMapping({})
 analyze.include_dependencies = {}
 

crates/ruff_graph/Cargo.toml

@@ -20,6 +20,7 @@ ty_python_semantic = { workspace = true }
 
 anyhow = { workspace = true }
 clap = { workspace = true, optional = true }
+memchr = { workspace = true }
 salsa = { workspace = true }
 schemars = { workspace = true, optional = true }
 serde = { workspace = true, optional = true }

crates/ruff_graph/src/collector.rs

@@ -1,3 +1,4 @@
+use crate::StringImports;
 use ruff_python_ast::visitor::source_order::{
     SourceOrderVisitor, walk_expr, walk_module, walk_stmt,
 };
@@ -10,13 +11,13 @@ pub(crate) struct Collector<'a> {
     /// The path to the current module.
     module_path: Option<&'a [String]>,
     /// Whether to detect imports from string literals.
-    string_imports: bool,
+    string_imports: StringImports,
     /// The collected imports from the Python AST.
     imports: Vec<CollectedImport>,
 }
 
 impl<'a> Collector<'a> {
-    pub(crate) fn new(module_path: Option<&'a [String]>, string_imports: bool) -> Self {
+    pub(crate) fn new(module_path: Option<&'a [String]>, string_imports: StringImports) -> Self {
         Self {
             module_path,
             string_imports,
@@ -118,7 +119,7 @@ impl<'ast> SourceOrderVisitor<'ast> for Collector<'_> {
             | Stmt::Continue(_)
             | Stmt::IpyEscapeCommand(_) => {
                 // Only traverse simple statements when string imports is enabled.
-                if self.string_imports {
+                if self.string_imports.enabled {
                     walk_stmt(self, stmt);
                 }
             }
@@ -126,20 +127,26 @@ impl<'ast> SourceOrderVisitor<'ast> for Collector<'_> {
     }
 
     fn visit_expr(&mut self, expr: &'ast Expr) {
-        if self.string_imports {
+        if self.string_imports.enabled {
             if let Expr::StringLiteral(ast::ExprStringLiteral {
                 value,
                 range: _,
                 node_index: _,
             }) = expr
             {
-                // Determine whether the string literal "looks like" an import statement: contains
-                // a dot, and consists solely of valid Python identifiers.
                 let value = value.to_str();
+                // Determine whether the string literal "looks like" an import statement: contains
+                // the requisite number of dots, and consists solely of valid Python identifiers.
+                if self.string_imports.min_dots == 0
+                    || memchr::memchr_iter(b'.', value.as_bytes()).count()
+                        >= self.string_imports.min_dots
+                {
                     if let Some(module_name) = ModuleName::new(value) {
                         self.imports.push(CollectedImport::Import(module_name));
                     }
                 }
+            }
+
             walk_expr(self, expr);
         }
     }

crates/ruff_graph/src/lib.rs

@@ -9,7 +9,7 @@ use ruff_python_parser::{Mode, ParseOptions, parse};
 use crate::collector::Collector;
 pub use crate::db::ModuleDb;
 use crate::resolver::Resolver;
-pub use crate::settings::{AnalyzeSettings, Direction};
+pub use crate::settings::{AnalyzeSettings, Direction, StringImports};
 
 mod collector;
 mod db;
@@ -26,7 +26,7 @@ impl ModuleImports {
         db: &ModuleDb,
         path: &SystemPath,
         package: Option<&SystemPath>,
-        string_imports: bool,
+        string_imports: StringImports,
     ) -> Result<Self> {
         // Read and parse the source code.
         let source = std::fs::read_to_string(path)?;

crates/ruff_graph/src/settings.rs

@@ -11,7 +11,7 @@ pub struct AnalyzeSettings {
     pub exclude: FilePatternSet,
     pub preview: PreviewMode,
     pub target_version: PythonVersion,
-    pub detect_string_imports: bool,
+    pub string_imports: StringImports,
     pub include_dependencies: BTreeMap<PathBuf, (PathBuf, Vec<String>)>,
     pub extension: ExtensionMapping,
 }
@@ -26,7 +26,7 @@ impl fmt::Display for AnalyzeSettings {
                 self.exclude,
                 self.preview,
                 self.target_version,
-                self.detect_string_imports,
+                self.string_imports,
                 self.extension | debug,
                 self.include_dependencies | debug,
             ]
@@ -35,6 +35,31 @@ impl fmt::Display for AnalyzeSettings {
     }
 }
 
+#[derive(Debug, Copy, Clone, CacheKey)]
+pub struct StringImports {
+    pub enabled: bool,
+    pub min_dots: usize,
+}
+
+impl Default for StringImports {
+    fn default() -> Self {
+        Self {
+            enabled: false,
+            min_dots: 2,
+        }
+    }
+}
+
+impl fmt::Display for StringImports {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        if self.enabled {
+            write!(f, "enabled (min_dots: {})", self.min_dots)
+        } else {
+            write!(f, "disabled")
+        }
+    }
+}
+
 #[derive(Default, Debug, Copy, Clone, PartialEq, Eq, CacheKey)]
 #[cfg_attr(
     feature = "serde",

crates/ruff_workspace/src/configuration.rs

@@ -20,7 +20,7 @@ use strum::IntoEnumIterator;
 
 use ruff_cache::cache_dir;
 use ruff_formatter::IndentStyle;
-use ruff_graph::{AnalyzeSettings, Direction};
+use ruff_graph::{AnalyzeSettings, Direction, StringImports};
 use ruff_linter::line_width::{IndentWidth, LineLength};
 use ruff_linter::registry::{INCOMPATIBLE_CODES, Rule, RuleNamespace, RuleSet};
 use ruff_linter::rule_selector::{PreviewOptions, Specificity};
@@ -222,9 +222,14 @@ impl Configuration {
             preview: analyze_preview,
             target_version,
             extension: self.extension.clone().unwrap_or_default(),
-            detect_string_imports: analyze
+            string_imports: StringImports {
+                enabled: analyze
                     .detect_string_imports
-                .unwrap_or(analyze_defaults.detect_string_imports),
+                    .unwrap_or(analyze_defaults.string_imports.enabled),
+                min_dots: analyze
+                    .string_imports_min_dots
+                    .unwrap_or(analyze_defaults.string_imports.min_dots),
+            },
             include_dependencies: analyze
                 .include_dependencies
                 .unwrap_or(analyze_defaults.include_dependencies),
@@ -1271,6 +1276,7 @@ pub struct AnalyzeConfiguration {
 
     pub direction: Option<Direction>,
     pub detect_string_imports: Option<bool>,
+    pub string_imports_min_dots: Option<usize>,
     pub include_dependencies: Option<BTreeMap<PathBuf, (PathBuf, Vec<String>)>>,
 }
 
@@ -1289,6 +1295,7 @@ impl AnalyzeConfiguration {
             preview: options.preview.map(PreviewMode::from),
             direction: options.direction,
             detect_string_imports: options.detect_string_imports,
+            string_imports_min_dots: options.string_imports_min_dots,
             include_dependencies: options.include_dependencies.map(|dependencies| {
                 dependencies
                     .into_iter()
@@ -1307,6 +1314,9 @@ impl AnalyzeConfiguration {
             preview: self.preview.or(config.preview),
             direction: self.direction.or(config.direction),
             detect_string_imports: self.detect_string_imports.or(config.detect_string_imports),
+            string_imports_min_dots: self
+                .string_imports_min_dots
+                .or(config.string_imports_min_dots),
             include_dependencies: self.include_dependencies.or(config.include_dependencies),
         }
     }

crates/ruff_workspace/src/options.rs

@@ -3843,6 +3843,12 @@ pub struct AnalyzeOptions {
         "#
     )]
     pub detect_string_imports: Option<bool>,
+    /// The minimum number of dots in a string to consider it a valid import.
+    ///
+    /// This setting is only relevant when [`detect-string-imports`](#detect-string-imports) is enabled.
+    /// For example, if this is set to `2`, then only strings with at least two dots (e.g., `"path.to.module"`)
+    /// would be considered valid imports.
+    pub string_imports_min_dots: Option<usize>,
     /// A map from file path to the list of Python or non-Python file paths or globs that should be
     /// considered dependencies of that file, regardless of whether relevant imports are detected.
     #[option(

ruff.schema.json

@@ -809,6 +809,15 @@
             "boolean",
             "null"
           ]
+        },
+        "string-imports-min-dots": {
+          "description": "The minimum number of dots in a string to consider it a valid import.\n\nThis setting is only relevant when [`detect-string-imports`](#detect-string-imports) is enabled. For example, if this is set to `2`, then only strings with at least two dots (e.g., `\"path.to.module\"`) would be considered valid imports.",
+          "type": [
+            "integer",
+            "null"
+          ],
+          "format": "uint",
+          "minimum": 0.0
         }
       },
       "additionalProperties": false