ripvec_core/

languages.rs

//! Language registry mapping file extensions to tree-sitter grammars.
//!
//! Each supported language has a grammar and a tree-sitter query that
//! extracts function, class, and method definitions. Compiled queries
//! are cached so that repeated calls for the same extension are free.

use std::sync::{Arc, OnceLock};

use tree_sitter::{Language, Query};

/// Configuration for extracting function calls from a language.
///
/// Wrapped in [`Arc`] so it can be shared across threads and returned
/// from the cache without cloning the compiled [`Query`].
pub struct CallConfig {
    /// The tree-sitter Language grammar.
    pub language: Language,
    /// Query that extracts call sites (`@callee` captures).
    pub query: Query,
}

/// Configuration for a supported source language.
///
/// Wrapped in [`Arc`] so it can be shared across threads and returned
/// from the cache without cloning the compiled [`Query`].
pub struct LangConfig {
    /// The tree-sitter Language grammar.
    pub language: Language,
    /// Query that extracts semantic chunks (`@def` captures with `@name`).
    pub query: Query,
}

/// LSP `SymbolKind` numeric values (as defined in the Language Server Protocol
/// specification version 3.17, §3.15.1).
///
/// Only the subset used by ripvec's Rust mapping is listed here. The full
/// specification defines values 1–26; constants are named for clarity and to
/// avoid embedding magic numbers at call sites.
pub mod lsp_symbol_kind {
    /// A file symbol. (1)
    pub const FILE: u32 = 1;
    /// A module or namespace. (2)
    pub const MODULE: u32 = 2;
    /// A namespace. (3)
    pub const NAMESPACE: u32 = 3;
    /// A package. (4)
    pub const PACKAGE: u32 = 4;
    /// A class. (5)
    pub const CLASS: u32 = 5;
    /// A method. (6)
    pub const METHOD: u32 = 6;
    /// A property. (7)
    pub const PROPERTY: u32 = 7;
    /// A field. (8)
    pub const FIELD: u32 = 8;
    /// A constructor. (9)
    pub const CONSTRUCTOR: u32 = 9;
    /// An enum type. (10)
    pub const ENUM: u32 = 10;
    /// An interface (trait in Rust). (11)
    pub const INTERFACE: u32 = 11;
    /// A function or free function. (12)
    pub const FUNCTION: u32 = 12;
    /// A variable. (13)
    pub const VARIABLE: u32 = 13;
    /// A constant or `const`/`static` item. (14)
    pub const CONSTANT: u32 = 14;
    /// A string literal symbol. (15)
    pub const STRING: u32 = 15;
    /// A numeric constant. (16)
    pub const NUMBER: u32 = 16;
    /// A boolean symbol. (17)
    pub const BOOLEAN: u32 = 17;
    /// An array or slice symbol. (18)
    pub const ARRAY: u32 = 18;
    /// An object or struct-like value. (19)
    pub const OBJECT: u32 = 19;
    /// A key in a key-value pair. (20)
    pub const KEY: u32 = 20;
    /// A null value symbol. (21)
    pub const NULL: u32 = 21;
    /// An enum member / variant. (22)
    pub const ENUM_MEMBER: u32 = 22;
    /// A struct type. (23)
    pub const STRUCT: u32 = 23;
    /// An event. (24)
    pub const EVENT: u32 = 24;
    /// An operator. (25)
    pub const OPERATOR: u32 = 25;
    /// A type parameter / type alias. (26)
    pub const TYPE_PARAMETER: u32 = 26;
}

/// Map a tree-sitter node kind string to an LSP `SymbolKind` numeric value.
///
/// The mapping covers Rust node kinds exhaustively, then falls back to a
/// cross-language best-effort mapping, and finally returns
/// [`lsp_symbol_kind::VARIABLE`] (13) for any unrecognised kind — preserving
/// the pre-B1 default so callers that don't need kind-awareness are unaffected.
///
/// # Rust node kinds
///
/// | tree-sitter kind | LSP SymbolKind |
/// |---|---|
/// | `function_item` | 12 (Function) |
/// | `function_signature_item` | 12 (Function) |
/// | `struct_item` | 23 (Struct) |
/// | `enum_item` | 10 (Enum) |
/// | `trait_item` | 11 (Interface) |
/// | `impl_item` | 5 (Class) — implementation block |
/// | `mod_item` | 2 (Module) |
/// | `const_item` | 14 (Constant) |
/// | `static_item` | 14 (Constant) |
/// | `type_item` | 26 (TypeParameter) |
/// | `field_declaration` | 8 (Field) |
/// | `enum_variant` | 22 (EnumMember) |
///
/// # Cross-language kinds
///
/// | tree-sitter kind | LSP SymbolKind |
/// |---|---|
/// | `function_definition` / `function_declaration` | 12 (Function) |
/// | `method_definition` / `method_declaration` | 6 (Method) |
/// | `class_definition` / `class_declaration` / `class_specifier` | 5 (Class) |
/// | `interface_declaration` / `trait_definition` / `interface_type` | 11 (Interface) |
/// | `variable_declarator` / `variable_declaration` / `assignment` | 13 (Variable) |
/// | `enum_declaration` / `enum_definition` | 10 (Enum) |
/// | `type_alias_declaration` / `type_definition` / `type_declaration` / `type_alias` | 26 (TypeParameter) |
/// | `constructor_declaration` | 9 (Constructor) |
/// | `module` | 2 (Module) |
/// | `object_definition` / `object_declaration` | 5 (Class) |
/// | `val_definition` / `var_definition` | 13 (Variable) |
/// | `property_declaration` / `decorated_definition` | 7 (Property) |
/// | `namespace_definition` | 3 (Namespace) |
/// | `protocol_declaration` | 11 (Interface) |
/// | `typealias_declaration` | 26 (TypeParameter) |
/// | `struct_type` | 23 (Struct) — Go struct type body |
/// | `block` / `table` / `pair` | 20 (Key) |
/// | `atx_heading` | 2 (Module) |
/// | `element` / `empty_element` | 5 (Class) |
/// | `rdf_statements` | 19 (Object) |
/// | `file` / `window` | 1 (File) |
///
/// # C preprocessor kinds (I53)
///
/// | tree-sitter kind | LSP SymbolKind |
/// |---|---|
/// | `preproc_def` | 14 (Constant) — object-like macro (`#define FOO 42`) |
/// | `preproc_function_def` | 12 (Function) — function-like macro (`#define F(x) ...`) |
#[must_use]
#[expect(
    clippy::match_same_arms,
    reason = "variable/assignment patterns are explicit for documentation completeness; \
              they intentionally duplicate the wildcard fallback (VARIABLE=13) so the \
              mapping table reads as a self-contained reference"
)]
pub fn lsp_symbol_kind_for_node_kind(node_kind: &str) -> u32 {
    use lsp_symbol_kind as K;
    match node_kind {
        // --- Function / method ---
        // Rust: function_item, function_signature_item
        // Cross-language: function_definition (Python, Ruby, Scala, Go, Java, Kotlin, Swift),
        //   function_declaration (C, C++, JS, TS, Bash)
        // C: preproc_function_def is the tree-sitter kind for function-like macros:
        //   `#define LIKELY(x) __builtin_expect(!!(x), 1)` / `#define container_of(ptr, type, member) ...`.
        //   Function (12) is used because function-like macros are callable (they take arguments
        //   and expand to an expression), making them semantically closer to Function than Constant.
        "function_item"
        | "function_signature_item"
        | "function_definition"
        | "function_declaration"
        | "preproc_function_def" => K::FUNCTION,

        // --- Method (non-free function bound to a type) ---
        "method_definition" | "method_declaration" => K::METHOD,

        // --- Constructor ---
        "constructor_declaration" => K::CONSTRUCTOR,

        // --- Struct ---
        "struct_item" => K::STRUCT,

        // --- Enum ---
        // Rust: enum_item; cross-language: enum_declaration, enum_definition
        "enum_item" | "enum_declaration" | "enum_definition" => K::ENUM,

        // --- Enum member / variant ---
        "enum_variant" => K::ENUM_MEMBER,

        // --- Interface / trait ---
        // Rust: trait_item; cross-language: interface_declaration, trait_definition,
        //   protocol_declaration (Swift); interface_type (Go — the body node of an
        //   interface type_spec, used as @def in the Go query to distinguish interfaces
        //   from other type declarations — K2 fix)
        "trait_item"
        | "interface_declaration"
        | "trait_definition"
        | "protocol_declaration"
        | "interface_type" => K::INTERFACE,

        // --- Struct ---
        // Go: struct_type is the body node of a struct type_spec; used as @def
        //   to distinguish struct declarations from other type declarations — K2 fix.
        "struct_type" => K::STRUCT,

        // --- Class / impl block ---
        // Rust: impl_item (implementation block — closest to LSP Class)
        // Cross-language: class_definition, class_declaration, class_specifier,
        //   object_definition (Scala), object_declaration (Kotlin),
        //   element (XML/RDF ontology element)
        "impl_item" | "class_definition" | "class_declaration" | "class_specifier"
        | "object_definition" | "object_declaration" | "element" => K::CLASS,

        // --- Module / namespace (used by heading-level symbols too) ---
        // Rust: mod_item; cross-language: module (Python module, Ruby module),
        //   mod_definition; atx_heading (Markdown headings as module-level anchors)
        "mod_item" | "module" | "mod_definition" | "atx_heading" => K::MODULE,

        // --- Namespace ---
        "namespace_definition" => K::NAMESPACE,

        // --- Constant ---
        // Rust: const_item and static_item (immutable statics are semantically constants)
        // HCL: local_attribute is the synthetic kind emitted by the chunker
        // for each `local.X = ...` attribute inside an HCL `locals { ... }`
        // block. T18 Cohesion Refraction queries can now distinguish
        // individual locals as Constants (R6, Wave 3).
        // C: preproc_def is the tree-sitter kind for object-like macros:
        //   `#define FOO 42` / `#define REDIS_OK 0` / `#define OBJ_ENCODING_INT 1`.
        //   Constant (14) is the closest LSP kind — these are named values, not callable.
        "const_item" | "static_item" | "local_attribute" | "preproc_def" => K::CONSTANT,

        // --- Type alias / type parameter ---
        // Rust: type_item; cross-language: type_alias_declaration (TS),
        //   type_definition (C typedef), type_declaration (Go fallback for non-interface
        //   non-struct types), typealias_declaration (Swift); type_alias (Go — the body
        //   node of `type X = Y` alias declarations — L2 fix: now maps to VARIABLE instead
        //   of TYPE_PARAMETER to distinguish aliases from pure generics)
        "type_item"
        | "type_alias_declaration"
        | "type_definition"
        | "type_declaration"
        | "typealias_declaration" => K::TYPE_PARAMETER,

        // --- Type alias (distinct from type parameters) ---
        // Go: type_alias is the @def node from `type X = Y` patterns (K2 fix).
        // L2 fix: maps to VARIABLE (13) instead of TYPE_PARAMETER (26) to distinguish
        // aliases from pure generics. Variable is used because LSP has no dedicated
        // alias kind, and Variable better represents the semantic nature of an alias
        // than TypeParameter (which represents generic type variables like T in [T any]).
        "type_alias" => K::VARIABLE,

        // --- Field ---
        "field_declaration" => K::FIELD,

        // --- Variable / assignment ---
        // Cross-language: variable_declarator (JS/TS), variable_declaration,
        //   assignment (Python, Ruby top-level), val_definition / var_definition (Scala)
        "variable_declarator"
        | "variable_declaration"
        | "assignment"
        | "val_definition"
        | "var_definition" => K::VARIABLE,

        // --- Property ---
        // Kotlin / Swift: property_declaration.
        // Python: decorated_definition (a function wrapped in a decorator).
        //   NOTE: this string-only mapping returns PROPERTY for ALL
        //   decorated_definition nodes, which is intentionally conservative
        //   (K1 fix: previously fell through to VARIABLE=13 as an unrecognised kind).
        //   Callers that have the full AST node should use `lsp_symbol_kind_for_node`
        //   instead, which inspects the first decorator name and returns FUNCTION (12)
        //   for @classmethod, @staticmethod, and arbitrary decorators (I#39 fix).
        "property_declaration" | "decorated_definition" => K::PROPERTY,

        // --- Data / config file structural kinds ---
        "block" | "table" | "pair" => K::KEY,

        // --- SQL kinds (S1, Wave 4) ---
        // SQL: tree-sitter-sequel emits `create_table` for `CREATE TABLE foo (...)`.
        //   STRUCT (23) matches Rust struct_item and Go struct_type: a table is the
        //   relational equivalent of a record type.
        "create_table" => K::STRUCT,
        // SQL: tree-sitter-sequel emits `cte` for `WITH foo AS (SELECT ...)`. CTEs
        //   are scoped intermediate result names — VARIABLE (13) is the closest LSP
        //   shape (no dedicated "alias" kind).
        "cte" => K::VARIABLE,
        // SQL: synthetic file-level def emitted by `repo_map::enrich_sql_file_def`
        //   for dbt/sqlmesh files whose model name is the filename stem and whose
        //   sqlmesh `MODEL (name @{schema}.X, ...)` header parses as an ERROR node.
        //   FILE (1) matches the "this whole file is the symbol" semantic.
        "sql_file" => K::FILE,

        // --- Fallback / special chunker kinds ---
        "rdf_statements" => K::OBJECT,
        "file" | "window" => K::FILE,

        // --- Unknown: preserve pre-B1 default (Variable = 13) ---
        _ => K::VARIABLE,
    }
}

/// Resolve the LSP `SymbolKind` for a `decorated_definition` tree-sitter node
/// given its first decorator name.
///
/// This is the authoritative decorator-kind mapping (I#39):
/// - `"property"` → 7 (Property) — the K1 target case
/// - `"cached_property"` → 7 (Property) — lazy property with identical semantics
/// - `"classmethod"` | `"staticmethod"` | any other identifier → 12 (Function)
/// - Complex decorators (`attribute` / `call` children — e.g. `@functools.wraps(f)`)
///   are passed as `""` by [`lsp_symbol_kind_for_node`] and fall through to 12.
///
/// Callers that have the full tree-sitter node should prefer
/// [`lsp_symbol_kind_for_node`] which extracts the decorator name automatically.
/// This function is exposed for callers that have already extracted the decorator
/// name (e.g., from a stored string field).
#[must_use]
pub fn lsp_symbol_kind_for_decorated_definition(first_decorator_name: &str) -> u32 {
    use lsp_symbol_kind as K;
    match first_decorator_name {
        "property" | "cached_property" => K::PROPERTY,
        // @classmethod and @staticmethod: these are class-bound callables, not
        // properties. FUNCTION (12) is used instead of METHOD (6) because the
        // outer context (class vs top-level) is not available here and FUNCTION
        // is the safer conservative choice. Callers that know the enclosing scope
        // may upgrade to METHOD.
        _ => K::FUNCTION,
    }
}

/// Extract the name of the first `decorator` child of a `decorated_definition`
/// tree-sitter node.
///
/// Returns `Some(name)` when the first decorator is a simple `identifier`
/// (e.g., `@property`, `@classmethod`, `@staticmethod`, `@cached_property`).
///
/// Returns `None` when:
/// - The node has no `decorator` children.
/// - The first decorator's first non-trivial child is an `attribute` node
///   (e.g., `@functools.wraps`) or a `call` node (e.g., `@functools.wraps(f)`).
///   These complex decorators are not property-like.
///
/// The returned `&str` is a slice of `source` (zero-copy).
fn first_decorator_ident<'src>(
    node: &tree_sitter::Node<'_>,
    source: &'src [u8],
) -> Option<&'src str> {
    let mut cursor = node.walk();
    for child in node.children(&mut cursor) {
        if child.kind() == "decorator" {
            // A decorator node looks like: `"@" <expression>`.
            // Walk its children to find the expression child.
            let mut inner = child.walk();
            for inner_child in child.children(&mut inner) {
                match inner_child.kind() {
                    // Simple @name decorator — return the identifier text.
                    "identifier" => {
                        let start = inner_child.start_byte();
                        let end = inner_child.end_byte();
                        return std::str::from_utf8(&source[start..end]).ok();
                    }
                    // Complex decorator (attribute access or call) — not a simple
                    // identifier; treat as arbitrary (non-property) decorator.
                    "attribute" | "call" => return None,
                    // Skip punctuation/whitespace nodes (e.g., the "@" token).
                    _ => {}
                }
            }
            // Decorator had no recognisable expression child.
            return None;
        }
    }
    None
}

/// Map a tree-sitter `Node` to an LSP `SymbolKind` numeric value.
///
/// This is the decorator-aware variant of [`lsp_symbol_kind_for_node_kind`].
/// For `decorated_definition` nodes (Python), it inspects the first decorator
/// child to distinguish `@property` (→ 7) from other decorators (→ 12).
/// For all other node kinds, it delegates to [`lsp_symbol_kind_for_node_kind`].
///
/// # Python decorator mapping (I#39)
///
/// | First decorator | LSP SymbolKind |
/// |---|---|
/// | `@property` | 7 (Property) |
/// | `@cached_property` | 7 (Property) |
/// | `@classmethod` | 12 (Function) |
/// | `@staticmethod` | 12 (Function) |
/// | `@functools.wraps(f)` (complex) | 12 (Function) |
/// | any other | 12 (Function) |
///
/// Callers that have the full tree-sitter parse tree available (e.g., the
/// chunker's `extract_name_captures`) should call this function instead of
/// `lsp_symbol_kind_for_node_kind(node.kind())` to get correct Python decorator
/// classification.
#[must_use]
pub fn lsp_symbol_kind_for_node(node: &tree_sitter::Node<'_>, source: &[u8]) -> u32 {
    if node.kind() == "decorated_definition" {
        let decorator = first_decorator_ident(node, source).unwrap_or("");
        return lsp_symbol_kind_for_decorated_definition(decorator);
    }
    lsp_symbol_kind_for_node_kind(node.kind())
}

/// Check whether a [`tree_sitter::Language`] is the Rust grammar.
///
/// Used by [`crate::repo_map`] to gate Rust-specific receiver-type heuristics.
/// Compares the node-kind count as a proxy for grammar identity (the node-kind
/// string table is stable across compatible ABI versions and differs between
/// grammars).
#[must_use]
pub fn is_rust_language(lang: &tree_sitter::Language) -> bool {
    let rust_lang: tree_sitter::Language = tree_sitter_rust::LANGUAGE.into();
    // Both must have the same ABI version AND the same number of node kinds
    // (a grammar-specific constant). This is not a guaranteed identity check but
    // is reliable enough for our heuristic gating.
    lang.abi_version() == rust_lang.abi_version()
        && lang.node_kind_count() == rust_lang.node_kind_count()
}

/// Check whether a [`tree_sitter::Language`] is the Python grammar.
///
/// Used by [`crate::repo_map`] to gate Python-specific receiver-type heuristics.
/// Same node-kind-count proxy as [`is_rust_language`].
#[must_use]
pub fn is_python_language(lang: &tree_sitter::Language) -> bool {
    let py_lang: tree_sitter::Language = tree_sitter_python::LANGUAGE.into();
    lang.abi_version() == py_lang.abi_version()
        && lang.node_kind_count() == py_lang.node_kind_count()
}

/// Check whether a [`tree_sitter::Language`] is the Go grammar.
///
/// Used by [`crate::repo_map`] to gate Go-specific receiver-type heuristics.
/// Same node-kind-count proxy as [`is_rust_language`].
#[must_use]
pub fn is_go_language(lang: &tree_sitter::Language) -> bool {
    let go_lang: tree_sitter::Language = tree_sitter_go::LANGUAGE.into();
    lang.abi_version() == go_lang.abi_version()
        && lang.node_kind_count() == go_lang.node_kind_count()
}

/// Check whether a [`tree_sitter::Language`] is the HCL grammar.
///
/// Used by [`crate::repo_map`] to gate HCL-specific call-edge extraction
/// (terraform_remote_state references and module blocks — R2/R3, Wave 3).
/// Same node-kind-count proxy as [`is_rust_language`].
#[must_use]
pub fn is_hcl_language(lang: &tree_sitter::Language) -> bool {
    let hcl_lang: tree_sitter::Language = tree_sitter_hcl::LANGUAGE.into();
    lang.abi_version() == hcl_lang.abi_version()
        && lang.node_kind_count() == hcl_lang.node_kind_count()
}

/// Check whether a [`tree_sitter::Language`] is the SQL grammar (tree-sitter-sequel).
///
/// Used by [`crate::repo_map`] to gate SQL-specific enrichment — the synthetic
/// file-level def for dbt/sqlmesh models (S1, Wave 4). Same node-kind-count proxy
/// as [`is_rust_language`].
#[must_use]
pub fn is_sql_language(lang: &tree_sitter::Language) -> bool {
    let sql_lang: tree_sitter::Language = tree_sitter_sequel::LANGUAGE.into();
    lang.abi_version() == sql_lang.abi_version()
        && lang.node_kind_count() == sql_lang.node_kind_count()
}

/// Check whether a [`tree_sitter::Language`] is the C grammar.
///
/// Used by [`crate::repo_map`] to gate C-specific call-edge extraction — the
/// struct-literal initializer fnptr post-pass (I#55, 4.1.5). C codebases
/// dispatch via tables of function pointers (Linux `file_operations`, redis
/// `redisCommandTable`, libuv handle vtables) — the post-pass emits one
/// synthetic edge per `identifier` found inside an `initializer_list`,
/// either designated (`.read = my_read`) or positional (`{"get",
/// getCommand}`). Same node-kind-count proxy as [`is_rust_language`].
#[must_use]
pub fn is_c_language(lang: &tree_sitter::Language) -> bool {
    let c_lang: tree_sitter::Language = tree_sitter_c::LANGUAGE.into();
    lang.abi_version() == c_lang.abi_version() && lang.node_kind_count() == c_lang.node_kind_count()
}

/// Check whether a [`tree_sitter::Language`] is the C++ grammar.
///
/// Used by [`crate::repo_map`] to gate C++-specific call-edge extraction —
/// the same struct-literal initializer fnptr post-pass as C (I#55, 4.1.5),
/// because C++ inherits C's initializer-list syntax and the same dispatch
/// pattern is common (e.g. POSIX-style driver tables in C++ kernels,
/// embedded firmware). Same node-kind-count proxy as [`is_rust_language`].
#[must_use]
pub fn is_cpp_language(lang: &tree_sitter::Language) -> bool {
    let cpp_lang: tree_sitter::Language = tree_sitter_cpp::LANGUAGE.into();
    lang.abi_version() == cpp_lang.abi_version()
        && lang.node_kind_count() == cpp_lang.node_kind_count()
}

/// Derive the canonical symbol name for an HCL `block` AST node.
///
/// HCL blocks have the form `keyword "type_label" "name_label" { ... }`:
/// - `resource "aws_iam_role" "loader" { ... }` → `"aws_iam_role.loader"`
/// - `data "aws_s3_bucket" "main" { ... }`      → `"aws_s3_bucket.main"`
/// - `variable "region" { ... }`                → `"region"`
/// - `output "role_arn" { ... }`                → `"role_arn"`
/// - `locals { ... }`                           → `"locals"`
///
/// This function is the authoritative composite-name implementation (K3). The chunker
/// pipeline uses the `@name` capture from the HCL query (the last string label or the
/// keyword for no-label blocks). Callers that need the full `type.name` format — e.g.
/// `"aws_iam_role.loader"` — should call this function directly after identifying the
/// block node.
///
/// Returns an owned `String` with the composite name. If the `block_node` is not
/// a `block` node, returns an empty string.
#[must_use]
pub fn derive_hcl_block_name(block_node: &tree_sitter::Node<'_>, source: &[u8]) -> String {
    if block_node.kind() != "block" {
        return String::new();
    }
    // Collect all template_literal texts from string_lit children (the block labels).
    // Children order: identifier, string_lit*, block_start, body, block_end.
    let mut labels: Vec<&str> = Vec::new();
    let mut cursor = block_node.walk();
    for child in block_node.children(&mut cursor) {
        if child.kind() == "string_lit" {
            // Walk into string_lit to find template_literal
            let mut inner = child.walk();
            for grandchild in child.children(&mut inner) {
                if grandchild.kind() == "template_literal" {
                    let start = grandchild.start_byte();
                    let end = grandchild.end_byte();
                    if let Ok(text) = std::str::from_utf8(&source[start..end]) {
                        labels.push(text);
                    }
                }
            }
        } else if child.kind() == "block_start" {
            // Stop at the opening brace — everything after is the block body.
            break;
        }
    }
    match labels.len() {
        0 => {
            // No string labels — use the identifier (e.g. "locals").
            let mut cursor2 = block_node.walk();
            for child in block_node.children(&mut cursor2) {
                if child.kind() == "identifier" {
                    let start = child.start_byte();
                    let end = child.end_byte();
                    if let Ok(text) = std::str::from_utf8(&source[start..end]) {
                        return text.to_string();
                    }
                }
            }
            String::new()
        }
        1 => labels[0].to_string(),
        _ => {
            // Two or more labels: join all but the keyword portion.
            // Convention: skip the first label if there are exactly two (type.name).
            // For three or more labels, join all with dots.
            labels.join(".")
        }
    }
}

/// Look up the language configuration for a file extension.
///
/// Compiled queries are cached per extension so repeated calls are free.
/// Returns `None` for unsupported extensions.
#[must_use]
pub fn config_for_extension(ext: &str) -> Option<Arc<LangConfig>> {
    // Cache of compiled configs, keyed by canonical extension.
    static CACHE: OnceLock<std::collections::HashMap<&'static str, Arc<LangConfig>>> =
        OnceLock::new();

    let cache = CACHE.get_or_init(|| {
        let mut m = std::collections::HashMap::new();
        // Pre-compile all supported extensions
        for &ext in &[
            "rs", "py", "pyi", "js", "jsx", "ts", "tsx", "go", "java", "c", "h", "cpp", "cc",
            "cxx", "hpp", "sh", "bash", "bats", "rb", "tf", "tfvars", "hcl", "kt", "kts", "swift",
            "scala", "toml", "json", "yaml", "yml", "md", "xml", "rdf", "owl", "sql",
        ] {
            if let Some(cfg) = compile_config(ext) {
                m.insert(ext, Arc::new(cfg));
            }
        }
        m
    });

    cache.get(ext).cloned()
}

/// Compile a [`LangConfig`] for the given extension (uncached).
#[expect(
    clippy::too_many_lines,
    reason = "one match arm per language — flat by design"
)]
fn compile_config(ext: &str) -> Option<LangConfig> {
    let (lang, query_str): (Language, &str) = match ext {
        // Rust: standalone functions, structs, and methods INSIDE impl/trait blocks.
        // impl_item and trait_item are NOT captured as wholes — we extract their
        // individual function_item children for method-level granularity.
        "rs" => (
            tree_sitter_rust::LANGUAGE.into(),
            concat!(
                "(function_item name: (identifier) @name) @def\n",
                "(struct_item name: (type_identifier) @name) @def\n",
                "(enum_item name: (type_identifier) @name) @def\n",
                "(type_item name: (type_identifier) @name) @def\n",
                "(field_declaration name: (field_identifier) @name) @def\n",
                "(enum_variant name: (identifier) @name) @def\n",
                "(impl_item type: (type_identifier) @name) @def\n",
                "(trait_item name: (type_identifier) @name) @def\n",
                "(const_item name: (identifier) @name) @def\n",
                "(static_item name: (identifier) @name) @def\n",
                "(mod_item name: (identifier) @name) @def",
            ),
        ),
        // Python: top-level functions AND methods inside classes (function_definition
        // matches at any nesting depth, so methods are captured individually).
        //
        // K1 fix: decorated functions (e.g. @property, @classmethod, @staticmethod)
        // are captured as decorated_definition with @name taken from the inner
        // function_definition. The chunker pipeline does not evaluate tree-sitter
        // predicates, so all decorated_definition nodes emit kind="decorated_definition"
        // → SymbolKind::PROPERTY (22). The @property case is the primary target; other
        // decorators are over-classified as PROPERTY but previously fell through to
        // VARIABLE (13) as an unrecognised kind, which was worse.
        "py" | "pyi" => (
            tree_sitter_python::LANGUAGE.into(),
            concat!(
                "(decorated_definition (function_definition name: (identifier) @name)) @def\n",
                "(function_definition name: (identifier) @name) @def\n",
                "(class_definition name: (identifier) @name) @def\n",
                "(assignment left: (identifier) @name) @def",
            ),
        ),
        // JS: functions, methods, and arrow functions assigned to variables.
        "js" | "jsx" => (
            tree_sitter_javascript::LANGUAGE.into(),
            concat!(
                "(function_declaration name: (identifier) @name) @def\n",
                "(method_definition name: (property_identifier) @name) @def\n",
                "(class_declaration name: (identifier) @name) @def\n",
                "(variable_declarator name: (identifier) @name) @def",
            ),
        ),
        "ts" => (
            tree_sitter_typescript::LANGUAGE_TYPESCRIPT.into(),
            concat!(
                "(function_declaration name: (identifier) @name) @def\n",
                "(method_definition name: (property_identifier) @name) @def\n",
                "(class_declaration name: (type_identifier) @name) @def\n",
                "(interface_declaration name: (type_identifier) @name) @def\n",
                "(variable_declarator name: (identifier) @name) @def\n",
                "(type_alias_declaration name: (type_identifier) @name) @def\n",
                "(enum_declaration name: (identifier) @name) @def",
            ),
        ),
        "tsx" => (
            tree_sitter_typescript::LANGUAGE_TSX.into(),
            concat!(
                "(function_declaration name: (identifier) @name) @def\n",
                "(method_definition name: (property_identifier) @name) @def\n",
                "(class_declaration name: (type_identifier) @name) @def\n",
                "(interface_declaration name: (type_identifier) @name) @def\n",
                "(variable_declarator name: (identifier) @name) @def\n",
                "(type_alias_declaration name: (type_identifier) @name) @def\n",
                "(enum_declaration name: (identifier) @name) @def",
            ),
        ),
        // Go: functions, methods, and type declarations.
        //
        // K2 fix: distinguish interface types (kind=11, Interface) from struct types
        // (kind=23, Struct) from other type declarations (kind=26, TypeParameter).
        // The previous single `(type_declaration (type_spec ...)) @def` pattern emitted
        // kind="type_declaration" for ALL types, mapping to TYPE_PARAMETER (26) and
        // making Go interfaces invisible to interface-kind filters.
        //
        // Strategy: use the INNER type body node as @def so that `node.kind()` reflects
        // the concrete type kind:
        //   - `interface_type` @def → kind="interface_type" → INTERFACE (11)
        //   - `struct_type`    @def → kind="struct_type"    → STRUCT (23)
        //   - `type_alias`     @def → kind="type_alias"     → TYPE_PARAMETER (26)
        //
        // Non-interface non-struct type_specs (e.g. `type MyChan chan int`) are NOT
        // captured; this is intentional to avoid duplicate chunks for the same declaration.
        "go" => (
            tree_sitter_go::LANGUAGE.into(),
            concat!(
                "(function_declaration name: (identifier) @name) @def\n",
                "(method_declaration name: (field_identifier) @name) @def\n",
                // Interface type: @def = interface_type → kind="interface_type" → INTERFACE
                "(type_declaration (type_spec name: (type_identifier) @name type: (interface_type) @def))\n",
                // Struct type: @def = struct_type → kind="struct_type" → STRUCT
                "(type_declaration (type_spec name: (type_identifier) @name type: (struct_type) @def))\n",
                // Type alias: @def = type_alias → kind="type_alias" → TYPE_PARAMETER
                "(type_declaration (type_alias name: (type_identifier) @name) @def)\n",
                "(const_spec name: (identifier) @name) @def",
            ),
        ),
        // Java: methods are already captured individually (method_declaration
        // matches inside class bodies). Keep class for the signature/fields.
        "java" => (
            tree_sitter_java::LANGUAGE.into(),
            concat!(
                "(method_declaration name: (identifier) @name) @def\n",
                "(class_declaration name: (identifier) @name) @def\n",
                "(interface_declaration name: (identifier) @name) @def\n",
                "(field_declaration declarator: (variable_declarator name: (identifier) @name)) @def\n",
                "(enum_constant name: (identifier) @name) @def\n",
                "(enum_declaration name: (identifier) @name) @def\n",
                "(constructor_declaration name: (identifier) @name) @def",
            ),
        ),
        // I#66: C pointer-returning functions are wrapped in `pointer_declarator`
        // nodes between `function_definition` and `function_declarator`, so the
        // simple direct pattern misses them. Three patterns cover the common cases:
        //   1. Direct:        `int foo(...)` — plain return type
        //   2. Pointer:       `struct foo *make_foo(...)` — one pointer level
        //   3. Double-pointer:`char **get_argv(...)` — two pointer levels
        // Triple-pointer is rare enough to be out of scope; the same three patterns
        // also apply to C++ below.
        "c" | "h" => (
            tree_sitter_c::LANGUAGE.into(),
            concat!(
                // 1. Direct: int foo(int x) { ... }
                "(function_definition declarator: (function_declarator declarator: (identifier) @name)) @def\n",
                // 2. Pointer-returning: struct foo *make_foo(int x) { ... }
                "(function_definition declarator: (pointer_declarator declarator: (function_declarator declarator: (identifier) @name))) @def\n",
                // 3. Double-pointer-returning: char **get_argv(int n) { ... }
                "(function_definition declarator: (pointer_declarator declarator: (pointer_declarator declarator: (function_declarator declarator: (identifier) @name)))) @def\n",
                "(declaration declarator: (init_declarator declarator: (identifier) @name)) @def\n",
                // I#55 (4.1.5): array-initializer declarations like
                //   `struct redisCommand cmds[] = { {"get", getCommand}, ... };`
                // The init_declarator's declarator is an `array_declarator`
                // wrapping the identifier, not the bare identifier. Without
                // this pattern, the table has no def to anchor the synthetic
                // struct-literal fnptr edges emitted by
                // `extract_c_struct_init_edges` — the redis command-table
                // and Linux per-driver lookup-table dispatchers would
                // remain unreachable from any entry point.
                "(declaration declarator: (init_declarator declarator: (array_declarator declarator: (identifier) @name))) @def\n",
                "(struct_specifier name: (type_identifier) @name) @def\n",
                "(enum_specifier name: (type_identifier) @name) @def\n",
                "(type_definition declarator: (type_identifier) @name) @def\n",
                // I53: object-like macros: #define FOO 42 → kind=preproc_def → Constant (14)
                "(preproc_def name: (identifier) @name) @def\n",
                // I53: function-like macros: #define F(x) ... → kind=preproc_function_def → Function (12)
                "(preproc_function_def name: (identifier) @name) @def",
            ),
        ),
        // C++: functions at any level, plus class signatures.
        // I#66: same pointer_declarator fix applied as for C above.
        "cpp" | "cc" | "cxx" | "hpp" => (
            tree_sitter_cpp::LANGUAGE.into(),
            concat!(
                // 1. Direct: int foo(int x) { ... }
                "(function_definition declarator: (function_declarator declarator: (identifier) @name)) @def\n",
                // 2. Pointer-returning: Foo *make(int x) { ... }
                "(function_definition declarator: (pointer_declarator declarator: (function_declarator declarator: (identifier) @name))) @def\n",
                // 3. Double-pointer-returning: char **get(int n) { ... }
                "(function_definition declarator: (pointer_declarator declarator: (pointer_declarator declarator: (function_declarator declarator: (identifier) @name)))) @def\n",
                "(class_specifier name: (type_identifier) @name) @def\n",
                "(declaration declarator: (init_declarator declarator: (identifier) @name)) @def\n",
                // I#55 (4.1.5): array-initializer declarations — mirrors C.
                // The same struct-of-fnptr dispatch idiom appears in
                // embedded/firmware C++ codebases.
                "(declaration declarator: (init_declarator declarator: (array_declarator declarator: (identifier) @name))) @def\n",
                "(struct_specifier name: (type_identifier) @name) @def\n",
                "(enum_specifier name: (type_identifier) @name) @def\n",
                "(type_definition declarator: (type_identifier) @name) @def\n",
                "(namespace_definition name: (namespace_identifier) @name) @def\n",
                "(field_declaration declarator: (field_identifier) @name) @def",
            ),
        ),
        // Bash: function definitions (.bats = Bash Automated Testing System).
        "sh" | "bash" | "bats" => (
            tree_sitter_bash::LANGUAGE.into(),
            concat!(
                "(function_definition name: (word) @name) @def\n",
                "(variable_assignment name: (variable_name) @name) @def",
            ),
        ),
        // Ruby: methods, classes, and modules.
        "rb" => (
            tree_sitter_ruby::LANGUAGE.into(),
            concat!(
                "(method name: (identifier) @name) @def\n",
                "(class name: (constant) @name) @def\n",
                "(module name: (constant) @name) @def\n",
                "(assignment left: (identifier) @name) @def\n",
                "(assignment left: (constant) @name) @def",
            ),
        ),
        // HCL (Terraform): resource, data, variable, and output blocks.
        //
        // K3 fix: index blocks by their semantic name rather than the keyword.
        // Previous query `(block (identifier) @name)` captured the block keyword
        // (e.g. "resource") as the symbol name, making `lsp_workspace_symbols(query="loader")`
        // unable to find `resource "aws_iam_role" "loader" { ... }`.
        //
        // Fixed query uses dot-anchor patterns to select the LAST string label
        // immediately before the opening `{` (block_start):
        //   - `resource "aws_iam_role" "loader" {}` → last string_lit before { = "loader" ✓
        //   - `data "aws_s3_bucket" "main" {}`    → last string_lit before { = "main"   ✓
        //   - `variable "region" {}`              → only  string_lit before { = "region" ✓
        //   - `output "role_arn" {}`              → only  string_lit before { = "role_arn" ✓
        //   - `locals {}`                          → no string_lit; identifier before { = "locals" ✓
        //
        // Cycle 13 W1 (B-0017/B-0021 family): the third pattern below captures
        // each `attribute` inside a `locals { ... }` body as a named def. This
        // closes the dense-pipeline gap where `find_similar(symbol_name="aws_projects")`
        // returned "not in index" — the AST-merge chunker in
        // `encoder::ripvec::dense::extract_name_captures` couldn't see per-local
        // attribute names, so they never reached BM25 or the chunk-name table.
        // The `#eq?` predicate scopes the capture to locals blocks; attributes
        // inside resource/data/module blocks are intentionally NOT captured
        // (they are intra-block scaffolding, not semantic symbols).
        //
        // Note: the composite `type.name` format (e.g. "aws_iam_role.loader") is available
        // via [`derive_hcl_block_name`] for callers that need it. The chunker uses the
        // `@name` capture (the last string_lit label or identifier) which already enables
        // workspace symbol queries to find resources by their specific name.
        "tf" | "tfvars" | "hcl" => (
            tree_sitter_hcl::LANGUAGE.into(),
            concat!(
                // Last string_lit immediately before block_start (covers both single-label
                // and multi-label blocks; the dot anchor selects only the final label).
                "(block (string_lit (template_literal) @name) . (block_start)) @def\n",
                // No-label blocks (e.g. locals): identifier immediately before block_start.
                "(block (identifier) @name . (block_start)) @def\n",
                // Per-locals-attribute capture (C13W1): each `aws_projects = ...`
                // inside `locals { ... }` becomes its own @name + @def match.
                // Scoped to locals via `#eq?` so resource/data block attributes
                // do not pollute the symbol table.
                "(block (identifier) @_kw (body (attribute (identifier) @name) @def) ",
                "(#eq? @_kw \"locals\"))",
            ),
        ),
        // Kotlin: functions, classes, and objects.
        "kt" | "kts" => (
            tree_sitter_kotlin_ng::LANGUAGE.into(),
            concat!(
                "(function_declaration name: (identifier) @name) @def\n",
                "(class_declaration name: (identifier) @name) @def\n",
                "(object_declaration name: (identifier) @name) @def\n",
                "(property_declaration (identifier) @name) @def\n",
                "(enum_entry (identifier) @name) @def",
            ),
        ),
        // Swift: functions, classes, structs, enums, and protocols.
        "swift" => (
            tree_sitter_swift::LANGUAGE.into(),
            concat!(
                "(function_declaration name: (simple_identifier) @name) @def\n",
                "(class_declaration name: (type_identifier) @name) @def\n",
                "(protocol_declaration name: (type_identifier) @name) @def\n",
                "(property_declaration name: (pattern bound_identifier: (simple_identifier) @name)) @def\n",
                "(typealias_declaration name: (type_identifier) @name) @def",
            ),
        ),
        // Scala: functions, classes, traits, and objects.
        "scala" => (
            tree_sitter_scala::LANGUAGE.into(),
            concat!(
                "(function_definition name: (identifier) @name) @def\n",
                "(class_definition name: (identifier) @name) @def\n",
                "(trait_definition name: (identifier) @name) @def\n",
                "(object_definition name: (identifier) @name) @def\n",
                "(val_definition pattern: (identifier) @name) @def\n",
                "(var_definition pattern: (identifier) @name) @def\n",
                "(type_definition name: (type_identifier) @name) @def",
            ),
        ),
        // TOML: table headers (sections).
        "toml" => (
            tree_sitter_toml_ng::LANGUAGE.into(),
            concat!(
                "(table (bare_key) @name) @def\n",
                "(pair (bare_key) @name) @def",
            ),
        ),
        // JSON: key-value pairs, capturing the key string content.
        "json" => (
            tree_sitter_json::LANGUAGE.into(),
            "(pair key: (string (string_content) @name)) @def",
        ),
        // YAML: block mapping pairs with plain scalar keys.
        "yaml" | "yml" => (
            tree_sitter_yaml::LANGUAGE.into(),
            "(block_mapping_pair key: (flow_node (plain_scalar (string_scalar) @name))) @def",
        ),
        // Markdown: ATX headings (# through ######), capturing the heading text.
        "md" => (
            tree_sitter_md::LANGUAGE.into(),
            "(atx_heading heading_content: (inline) @name) @def",
        ),
        // RDF/XML and OWL/XML are XML documents; capture each element so
        // ontology classes/properties become searchable semantic chunks.
        "xml" | "rdf" | "owl" => (
            tree_sitter_xml::LANGUAGE_XML.into(),
            concat!(
                "(element (STag (Name) @name)) @def\n",
                "(element (EmptyElemTag (Name) @name)) @def",
            ),
        ),
        // SQL: CREATE TABLE statements and common table expressions (CTEs).
        // Powered by tree-sitter-sequel (derekstride/tree-sitter-sql).
        //
        // dbt/sqlmesh files conventionally name their model by the *filename*
        // rather than an in-source CREATE TABLE — see `enrich_sql_file_def` in
        // repo_map.rs for the synthetic file-level def that fills that gap.
        // The chunker-level query below captures any in-source CREATE TABLE
        // and CTE so they remain searchable semantic chunks even when the
        // file uses sqlmesh `MODEL (...)` headers (which parse as ERROR nodes
        // — FROM/JOIN still extract cleanly post-error per S1 design).
        "sql" => (
            tree_sitter_sequel::LANGUAGE.into(),
            concat!(
                // CREATE TABLE foo — table-as-def.
                "(create_table (object_reference name: (identifier) @name)) @def\n",
                // WITH foo AS (SELECT ...) — CTE-as-def.
                "(cte (identifier) @name) @def",
            ),
        ),
        _ => return None,
    };
    let query = match Query::new(&lang, query_str) {
        Ok(q) => q,
        Err(e) => {
            tracing::warn!(ext, %e, "tree-sitter query compilation failed — language may be ABI-incompatible");
            return None;
        }
    };
    Some(LangConfig {
        language: lang,
        query,
    })
}

/// Look up the call-extraction query for a file extension.
///
/// Compiled queries are cached per extension so repeated calls are free.
/// Returns `None` for unsupported extensions (including TOML, which has
/// no function calls).
#[must_use]
pub fn call_query_for_extension(ext: &str) -> Option<Arc<CallConfig>> {
    static CACHE: OnceLock<std::collections::HashMap<&'static str, Arc<CallConfig>>> =
        OnceLock::new();

    let cache = CACHE.get_or_init(|| {
        let mut m = std::collections::HashMap::new();
        // Pre-compile for all extensions that have callable constructs.
        // TOML is deliberately excluded — it has no function calls.
        // SQL has FROM/JOIN as call-edges (model-to-model references) —
        // emitted by the per-language call query plus a synthetic
        // file-level def in repo_map::enrich_sql_file_def (S1, Wave 4).
        for &ext in &[
            "rs", "py", "pyi", "js", "jsx", "ts", "tsx", "go", "java", "c", "h", "cpp", "cc",
            "cxx", "hpp", "sh", "bash", "bats", "rb", "tf", "tfvars", "hcl", "kt", "kts", "swift",
            "scala", "sql",
        ] {
            if let Some(cfg) = compile_call_config(ext) {
                m.insert(ext, Arc::new(cfg));
            }
        }
        m
    });

    cache.get(ext).cloned()
}

/// Compile a [`CallConfig`] for the given extension (uncached).
///
/// Each query extracts the callee identifier (`@callee`) from function
/// and method calls, plus the whole call expression (`@call`).
#[expect(
    clippy::too_many_lines,
    reason = "one match arm per language — flat by design"
)]
fn compile_call_config(ext: &str) -> Option<CallConfig> {
    let (lang, query_str): (Language, &str) = match ext {
        // Rust: free calls, method calls, and scoped (path) calls.
        //
        // For scoped calls, capture the full `scoped_identifier` node as @callee
        // (not just the trailing `(identifier)` child). This preserves the qualified
        // path so that `mod_a::foo()` records "mod_a::foo" rather than bare "foo",
        // enabling cross-module disambiguation in `resolve_calls`.
        "rs" => (
            tree_sitter_rust::LANGUAGE.into(),
            concat!(
                "(call_expression function: (identifier) @callee) @call\n",
                "(call_expression function: (field_expression field: (field_identifier) @callee)) @call\n",
                "(call_expression function: (scoped_identifier) @callee) @call",
            ),
        ),
        // Python: simple calls and attribute (method) calls.
        "py" | "pyi" => (
            tree_sitter_python::LANGUAGE.into(),
            concat!(
                "(call function: (identifier) @callee) @call\n",
                "(call function: (attribute attribute: (identifier) @callee)) @call",
            ),
        ),
        // JavaScript: function calls and member expression calls.
        "js" | "jsx" => (
            tree_sitter_javascript::LANGUAGE.into(),
            concat!(
                "(call_expression function: (identifier) @callee) @call\n",
                "(call_expression function: (member_expression property: (property_identifier) @callee)) @call",
            ),
        ),
        // TypeScript: same patterns as JavaScript.
        "ts" => (
            tree_sitter_typescript::LANGUAGE_TYPESCRIPT.into(),
            concat!(
                "(call_expression function: (identifier) @callee) @call\n",
                "(call_expression function: (member_expression property: (property_identifier) @callee)) @call",
            ),
        ),
        // TSX: same patterns as JavaScript.
        "tsx" => (
            tree_sitter_typescript::LANGUAGE_TSX.into(),
            concat!(
                "(call_expression function: (identifier) @callee) @call\n",
                "(call_expression function: (member_expression property: (property_identifier) @callee)) @call",
            ),
        ),
        // Go: function calls and selector (method) calls.
        "go" => (
            tree_sitter_go::LANGUAGE.into(),
            concat!(
                "(call_expression function: (identifier) @callee) @call\n",
                "(call_expression function: (selector_expression field: (field_identifier) @callee)) @call",
            ),
        ),
        // Java: method invocations.
        "java" => (
            tree_sitter_java::LANGUAGE.into(),
            "(method_invocation name: (identifier) @callee) @call",
        ),
        // C: function calls and field-expression calls (function pointers).
        "c" | "h" => (
            tree_sitter_c::LANGUAGE.into(),
            concat!(
                "(call_expression function: (identifier) @callee) @call\n",
                "(call_expression function: (field_expression field: (field_identifier) @callee)) @call",
            ),
        ),
        // C++: same patterns as C.
        "cpp" | "cc" | "cxx" | "hpp" => (
            tree_sitter_cpp::LANGUAGE.into(),
            concat!(
                "(call_expression function: (identifier) @callee) @call\n",
                "(call_expression function: (field_expression field: (field_identifier) @callee)) @call",
            ),
        ),
        // Bash: command invocations (.bats = Bash Automated Testing System).
        "sh" | "bash" | "bats" => (
            tree_sitter_bash::LANGUAGE.into(),
            "(command name: (command_name (word) @callee)) @call",
        ),
        // Ruby: method calls.
        "rb" => (
            tree_sitter_ruby::LANGUAGE.into(),
            "(call method: (identifier) @callee) @call",
        ),
        // HCL (Terraform): built-in function calls.
        "tf" | "tfvars" | "hcl" => (
            tree_sitter_hcl::LANGUAGE.into(),
            "(function_call (identifier) @callee) @call",
        ),
        // Kotlin: call expressions — grammar uses unnamed children, so match
        // identifier as first child of call_expression.
        "kt" | "kts" => (
            tree_sitter_kotlin_ng::LANGUAGE.into(),
            "(call_expression (identifier) @callee) @call",
        ),
        // Swift: call expressions with simple identifiers.
        "swift" => (
            tree_sitter_swift::LANGUAGE.into(),
            "(call_expression (simple_identifier) @callee) @call",
        ),
        // Scala: function calls and field-expression (method) calls.
        "scala" => (
            tree_sitter_scala::LANGUAGE.into(),
            concat!(
                "(call_expression function: (identifier) @callee) @call\n",
                "(call_expression function: (field_expression field: (identifier) @callee)) @call",
            ),
        ),
        // SQL: FROM <table> and JOIN <table> as call-edges. Schema-qualified
        // names like `analytics.silver_X` parse as
        //   (object_reference schema: (identifier) name: (identifier))
        // — the field selector `name:` picks the table identifier and skips
        // the schema prefix, which is correct for cross-model resolution
        // (downstream dbt/sqlmesh models reference each other by table name
        // not by schema + name).
        "sql" => (
            tree_sitter_sequel::LANGUAGE.into(),
            concat!(
                // FROM <table>: relation > object_reference > name identifier.
                "(from (relation (object_reference name: (identifier) @callee))) @call\n",
                // JOIN <table>: same shape, inside a join clause.
                "(join (relation (object_reference name: (identifier) @callee))) @call",
            ),
        ),
        _ => return None,
    };
    let query = match Query::new(&lang, query_str) {
        Ok(q) => q,
        Err(e) => {
            tracing::warn!(ext, %e, "tree-sitter call query compilation failed");
            return None;
        }
    };
    Some(CallConfig {
        language: lang,
        query,
    })
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn rust_extension_resolves() {
        assert!(config_for_extension("rs").is_some());
    }

    #[test]
    fn python_extension_resolves() {
        assert!(config_for_extension("py").is_some());
    }

    #[test]
    fn python_stub_extension_resolves() {
        assert!(config_for_extension("pyi").is_some());
    }

    #[test]
    fn unknown_extension_returns_none() {
        assert!(config_for_extension("xyz").is_none());
    }

    #[test]
    fn all_supported_extensions() {
        let exts = [
            "rs", "py", "pyi", "js", "jsx", "ts", "tsx", "go", "java", "c", "h", "cpp", "cc",
            "cxx", "hpp", "sh", "bash", "bats", "rb", "tf", "tfvars", "hcl", "kt", "kts", "swift",
            "scala", "toml", "json", "yaml", "yml", "md", "xml", "rdf", "owl", "sql",
        ];
        for ext in &exts {
            assert!(config_for_extension(ext).is_some(), "failed for {ext}");
        }
    }

    #[test]
    fn turtle_family_uses_rdf_text_chunking_not_tree_sitter() {
        for ext in ["ttl", "nt", "n3", "trig", "nq"] {
            assert!(
                config_for_extension(ext).is_none(),
                "{ext} should be handled by RDF text chunking"
            );
            assert!(crate::chunk::is_rdf_text_extension(ext));
        }
    }

    #[test]
    fn all_call_query_extensions() {
        let exts = [
            "rs", "py", "pyi", "js", "jsx", "ts", "tsx", "go", "java", "c", "h", "cpp", "cc",
            "cxx", "hpp", "sh", "bash", "bats", "rb", "tf", "tfvars", "hcl", "kt", "kts", "swift",
            "scala", "sql",
        ];
        for ext in &exts {
            assert!(
                call_query_for_extension(ext).is_some(),
                "call query failed for {ext}"
            );
        }
    }

    #[test]
    fn toml_has_no_call_query() {
        assert!(call_query_for_extension("toml").is_none());
    }

    /// RED test (R2.3 issue a): scoped_identifier call must capture the full path.
    ///
    /// Before the fix, `mod_a::foo()` captured only `foo` as @callee.
    /// After the fix, it must capture `mod_a::foo` as @callee.
    #[test]
    fn test_scoped_identifier_call_query_captures_full_path() {
        use streaming_iterator::StreamingIterator as _;

        let source = "
fn caller() {
    mod_a::foo();
    std::io::stderr();
}
";
        let call_cfg = call_query_for_extension("rs").expect("rs call config");
        let mut parser = tree_sitter::Parser::new();
        parser
            .set_language(&call_cfg.language)
            .expect("set language");
        let tree = parser.parse(source, None).expect("parse");

        let mut cursor = tree_sitter::QueryCursor::new();
        let mut matches = cursor.matches(&call_cfg.query, tree.root_node(), source.as_bytes());

        let mut callees: Vec<String> = Vec::new();
        while let Some(m) = matches.next() {
            for cap in m.captures {
                let name = &call_cfg.query.capture_names()[cap.index as usize];
                if *name == "callee" {
                    let text = &source[cap.node.start_byte()..cap.node.end_byte()];
                    callees.push(text.to_string());
                }
            }
        }

        // Must contain full qualified path, not bare identifier
        assert!(
            callees.contains(&"mod_a::foo".to_string()),
            "expected 'mod_a::foo' in callees, got: {callees:?}"
        );
        // Bare 'foo' must not appear when scoped call is made
        assert!(
            !callees.contains(&"foo".to_string()),
            "bare 'foo' must not appear for scoped call; got: {callees:?}"
        );
    }

    // -------------------------------------------------------------------------
    // B1: tree-sitter node-kind → LSP SymbolKind mapping tests
    // -------------------------------------------------------------------------

    /// `test:rust_node_kind_maps_to_lsp_symbol_kind_struct` — `struct_item`
    /// maps to LSP SymbolKind 23 (Struct).
    ///
    /// Behavior: trigger-fails-on-baseline-then-passes-post-fix.
    /// On the baseline `lsp_symbol_kind_for_node_kind` did not exist.
    #[test]
    fn rust_node_kind_maps_to_lsp_symbol_kind_struct() {
        assert_eq!(
            lsp_symbol_kind_for_node_kind("struct_item"),
            lsp_symbol_kind::STRUCT,
            "struct_item must map to SymbolKind::Struct (23)"
        );
    }

    /// `test:rust_node_kind_maps_to_lsp_symbol_kind_trait` — `trait_item`
    /// maps to LSP SymbolKind 11 (Interface).
    #[test]
    fn rust_node_kind_maps_to_lsp_symbol_kind_trait() {
        assert_eq!(
            lsp_symbol_kind_for_node_kind("trait_item"),
            lsp_symbol_kind::INTERFACE,
            "trait_item must map to SymbolKind::Interface (11)"
        );
    }

    /// `test:rust_node_kind_maps_to_lsp_symbol_kind_enum` — `enum_item`
    /// maps to LSP SymbolKind 10 (Enum).
    #[test]
    fn rust_node_kind_maps_to_lsp_symbol_kind_enum() {
        assert_eq!(
            lsp_symbol_kind_for_node_kind("enum_item"),
            lsp_symbol_kind::ENUM,
            "enum_item must map to SymbolKind::Enum (10)"
        );
    }

    /// `test:rust_node_kind_maps_to_lsp_symbol_kind_function` — `function_item`
    /// maps to LSP SymbolKind 12 (Function).
    #[test]
    fn rust_node_kind_maps_to_lsp_symbol_kind_function() {
        assert_eq!(
            lsp_symbol_kind_for_node_kind("function_item"),
            lsp_symbol_kind::FUNCTION,
            "function_item must map to SymbolKind::Function (12)"
        );
    }

    /// `test:rust_node_kind_maps_to_lsp_symbol_kind_module` — `mod_item`
    /// maps to LSP SymbolKind 2 (Module).
    #[test]
    fn rust_node_kind_maps_to_lsp_symbol_kind_module() {
        assert_eq!(
            lsp_symbol_kind_for_node_kind("mod_item"),
            lsp_symbol_kind::MODULE,
            "mod_item must map to SymbolKind::Module (2)"
        );
    }

    /// Additional B1 coverage: impl, const, static, type_item all map
    /// to meaningful, non-Variable kinds.
    #[test]
    fn rust_node_kinds_map_to_non_variable_kinds() {
        let cases: &[(&str, u32)] = &[
            ("impl_item", lsp_symbol_kind::CLASS),
            ("const_item", lsp_symbol_kind::CONSTANT),
            ("static_item", lsp_symbol_kind::CONSTANT),
            ("type_item", lsp_symbol_kind::TYPE_PARAMETER),
            ("field_declaration", lsp_symbol_kind::FIELD),
            ("enum_variant", lsp_symbol_kind::ENUM_MEMBER),
            ("function_signature_item", lsp_symbol_kind::FUNCTION),
        ];
        for &(kind, expected) in cases {
            assert_eq!(
                lsp_symbol_kind_for_node_kind(kind),
                expected,
                "node kind '{kind}' should map to {expected}, got {}",
                lsp_symbol_kind_for_node_kind(kind)
            );
        }
    }

    /// Unknown node kinds fall back to Variable (13) — preserving pre-B1 default.
    #[test]
    fn unknown_node_kind_falls_back_to_variable() {
        assert_eq!(
            lsp_symbol_kind_for_node_kind("some_unknown_kind"),
            lsp_symbol_kind::VARIABLE,
            "unknown kind must fall back to Variable (13)"
        );
    }

    // =========================================================================
    // K1 — Python @property classification (I#17a)
    // =========================================================================

    /// `test:python_property_decorator_classifies_as_property_kind`
    ///
    /// Baseline (RED): `decorated_definition` was not in the kind mapping, so it
    /// fell through to VARIABLE (13). The Python `@property` decorated method was
    /// thus invisible to LSP property-kind filters.
    ///
    /// After fix (GREEN): `decorated_definition` maps to PROPERTY (22), and the
    /// Python query captures `decorated_definition` as `@def` so `@property`-decorated
    /// methods emit kind="decorated_definition" → SymbolKind::Property.
    #[test]
    fn python_property_decorator_classifies_as_property_kind() {
        // The kind mapping must return PROPERTY (22) for decorated_definition.
        assert_eq!(
            lsp_symbol_kind_for_node_kind("decorated_definition"),
            lsp_symbol_kind::PROPERTY,
            "decorated_definition must map to SymbolKind::Property (22); baseline gave Variable (13)"
        );
    }

    /// The Python query must capture `@property`-decorated methods as `@def=decorated_definition`.
    ///
    /// Uses tree-sitter to parse a Python source snippet with a `@property` decorated
    /// method, runs the compiled Python LangConfig query, and verifies that at least one
    /// match emits `def_kind = "decorated_definition"` with `name = "name"`.
    #[test]
    fn python_property_query_captures_decorated_definition() {
        use streaming_iterator::StreamingIterator as _;

        let source = r"class MyModel:
    @property
    def name(self):
        return self._name

    @name.setter
    def name(self, value):
        self._name = value

    def regular_method(self):
        pass
";
        let cfg = config_for_extension("py").expect("Python config must compile");
        let mut parser = tree_sitter::Parser::new();
        parser.set_language(&cfg.language).expect("set language");
        let tree = parser.parse(source, None).expect("parse");

        let mut cursor = tree_sitter::QueryCursor::new();
        let mut matches = cursor.matches(&cfg.query, tree.root_node(), source.as_bytes());

        let mut property_kind_found = false;
        let mut property_name_found = false;
        while let Some(m) = matches.next() {
            let mut name = "";
            let mut def_kind = "";
            for cap in m.captures {
                let cap_name = &cfg.query.capture_names()[cap.index as usize];
                let text = &source[cap.node.start_byte()..cap.node.end_byte()];
                if *cap_name == "name" {
                    name = text;
                } else if *cap_name == "def" {
                    def_kind = cap.node.kind();
                }
            }
            if def_kind == "decorated_definition" && name == "name" {
                property_kind_found = true;
                property_name_found = true;
            }
        }
        assert!(
            property_kind_found,
            "Python query must capture decorated_definition for @property method; got none"
        );
        assert!(
            property_name_found,
            "Python query must capture 'name' as the method name inside @property definition"
        );
    }

    // =========================================================================
    // K2 — Go interface classification (I#17b)
    // =========================================================================

    /// `test:go_interface_type_classifies_as_interface_kind`
    ///
    /// Baseline (RED): all Go type declarations used `(type_declaration ...) @def`
    /// which sets kind="type_declaration" → TYPE_PARAMETER (26). Interfaces were
    /// invisible to interface-kind filters (`kind=11`).
    ///
    /// After fix (GREEN): interface types use `(interface_type) @def` → kind=
    /// "interface_type" → INTERFACE (11).
    #[test]
    fn go_interface_type_classifies_as_interface_kind() {
        assert_eq!(
            lsp_symbol_kind_for_node_kind("interface_type"),
            lsp_symbol_kind::INTERFACE,
            "interface_type must map to SymbolKind::Interface (11); baseline gave TypeParameter (26)"
        );
    }

    /// `test:go_struct_type_classifies_as_struct_kind`
    ///
    /// Baseline (RED): struct types were also TYPE_PARAMETER (26) via the generic
    /// type_declaration pattern. After fix: struct_type → STRUCT (23).
    #[test]
    fn go_struct_type_classifies_as_struct_kind() {
        assert_eq!(
            lsp_symbol_kind_for_node_kind("struct_type"),
            lsp_symbol_kind::STRUCT,
            "struct_type must map to SymbolKind::Struct (23); baseline gave TypeParameter (26)"
        );
    }

    /// The Go query must emit kind="interface_type" for `type Reader interface { ... }`.
    ///
    /// Parses a Go source snippet and verifies that the compiled Go LangConfig query
    /// produces a match with def_kind="interface_type" and name="Reader".
    #[test]
    fn go_interface_query_captures_interface_type() {
        use streaming_iterator::StreamingIterator as _;

        let source = r"package io
type Reader interface {
    Read(p []byte) (n int, err error)
}
type MyStruct struct {
    Name string
}
func NewReader() Reader {
    return nil
}
";
        let cfg = config_for_extension("go").expect("Go config must compile");
        let mut parser = tree_sitter::Parser::new();
        parser.set_language(&cfg.language).expect("set language");
        let tree = parser.parse(source, None).expect("parse");

        let mut cursor = tree_sitter::QueryCursor::new();
        let mut matches = cursor.matches(&cfg.query, tree.root_node(), source.as_bytes());

        let mut interface_found = false;
        let mut struct_found = false;
        let mut function_found = false;
        while let Some(m) = matches.next() {
            let mut name = "";
            let mut def_kind = "";
            for cap in m.captures {
                let cap_name = &cfg.query.capture_names()[cap.index as usize];
                let text = &source[cap.node.start_byte()..cap.node.end_byte()];
                if *cap_name == "name" {
                    name = text;
                } else if *cap_name == "def" {
                    def_kind = cap.node.kind();
                }
            }
            if def_kind == "interface_type" && name == "Reader" {
                interface_found = true;
            }
            if def_kind == "struct_type" && name == "MyStruct" {
                struct_found = true;
            }
            if def_kind == "function_declaration" && name == "NewReader" {
                function_found = true;
            }
        }
        assert!(
            interface_found,
            "Go query must emit def_kind='interface_type' for 'type Reader interface {{ ... }}'"
        );
        assert!(
            struct_found,
            "Go query must emit def_kind='struct_type' for 'type MyStruct struct {{ ... }}'"
        );
        assert!(
            function_found,
            "Go query must emit def_kind='function_declaration' for 'func NewReader()'"
        );
    }

    // =========================================================================
    // K3 — HCL resource naming (I#17c)
    // =========================================================================

    /// `test:hcl_resource_symbol_uses_type_dot_name`
    ///
    /// Verifies that `derive_hcl_block_name` produces the `type.name` composite
    /// for a two-label HCL block (e.g. `resource "aws_iam_role" "loader" { ... }`
    /// → "aws_iam_role.loader").
    ///
    /// Baseline (RED): the previous HCL query captured the keyword ("resource") as the
    /// symbol name, making `lsp_workspace_symbols(query="loader")` unable to find the
    /// resource. The query fix makes the chunker emit "loader" as the name; this function
    /// enables callers to reconstruct the full "aws_iam_role.loader" composite.
    #[test]
    fn hcl_resource_symbol_uses_type_dot_name() {
        let source = br#"resource "aws_iam_role" "loader" {
  assume_role_policy = "assume.json"
}
"#;
        let lang: tree_sitter::Language = tree_sitter_hcl::LANGUAGE.into();
        let mut parser = tree_sitter::Parser::new();
        parser.set_language(&lang).expect("set HCL language");
        let tree = parser.parse(source, None).expect("parse HCL");

        // Find the first block node
        let root = tree.root_node();
        let body = root.child(0).expect("config_file has body");
        #[expect(
            clippy::cast_possible_truncation,
            reason = "child_count() is a small usize; fits in u32"
        )]
        let block = (0..body.child_count())
            .filter_map(|i| body.child(i as u32))
            .find(|n| n.kind() == "block")
            .expect("should have at least one block node");

        let name = derive_hcl_block_name(&block, source);
        assert_eq!(
            name, "aws_iam_role.loader",
            "derive_hcl_block_name must produce 'aws_iam_role.loader' for \
             `resource \"aws_iam_role\" \"loader\"` block; got {name:?}"
        );
    }

    /// `test:hcl_data_source_symbol_uses_type_dot_name`
    ///
    /// Verifies `derive_hcl_block_name` produces "aws_s3_bucket.main" for
    /// `data "aws_s3_bucket" "main" { ... }`.
    #[test]
    fn hcl_data_source_symbol_uses_type_dot_name() {
        let source = br#"data "aws_s3_bucket" "main" {
  bucket = "my-bucket"
}
"#;
        let lang: tree_sitter::Language = tree_sitter_hcl::LANGUAGE.into();
        let mut parser = tree_sitter::Parser::new();
        parser.set_language(&lang).expect("set HCL language");
        let tree = parser.parse(source, None).expect("parse HCL");

        let root = tree.root_node();
        let body = root.child(0).expect("config_file has body");
        #[expect(
            clippy::cast_possible_truncation,
            reason = "child_count() returns a small usize; fits in u32"
        )]
        let block = (0..body.child_count())
            .filter_map(|i| body.child(i as u32))
            .find(|n| n.kind() == "block")
            .expect("block node");

        let name = derive_hcl_block_name(&block, source);
        assert_eq!(
            name, "aws_s3_bucket.main",
            "derive_hcl_block_name must produce 'aws_s3_bucket.main'"
        );
    }

    /// The HCL query must capture the resource name (last string label) not the keyword.
    ///
    /// Verifies that the compiled HCL LangConfig query emits `@name = "loader"` (not
    /// "resource") for `resource "aws_iam_role" "loader" { ... }`. This is the live
    /// chunker behaviour that makes `lsp_workspace_symbols(query="loader")` work.
    #[test]
    fn hcl_query_captures_resource_name_not_keyword() {
        use streaming_iterator::StreamingIterator as _;

        let source = r#"resource "aws_iam_role" "loader" {
  x = 1
}
variable "region" {
  type = "string"
}
output "role_arn" {
  value = "arn"
}
locals {
  x = 1
}
"#;
        let cfg = config_for_extension("tf").expect("HCL config must compile");
        let mut parser = tree_sitter::Parser::new();
        parser.set_language(&cfg.language).expect("set language");
        let tree = parser.parse(source, None).expect("parse");

        let mut cursor = tree_sitter::QueryCursor::new();
        let mut matches = cursor.matches(&cfg.query, tree.root_node(), source.as_bytes());

        let mut names: Vec<(String, String)> = Vec::new(); // (name, def_kind)
        while let Some(m) = matches.next() {
            let mut name = String::new();
            let mut def_kind = String::new();
            for cap in m.captures {
                let cap_name = &cfg.query.capture_names()[cap.index as usize];
                let text = &source[cap.node.start_byte()..cap.node.end_byte()];
                if *cap_name == "name" {
                    name = text.to_string();
                } else if *cap_name == "def" {
                    def_kind = cap.node.kind().to_string();
                }
            }
            if !name.is_empty() {
                names.push((name, def_kind));
            }
        }

        let name_list: Vec<&str> = names.iter().map(|(n, _)| n.as_str()).collect();

        // Must capture "loader" (not "resource") for the resource block.
        assert!(
            name_list.contains(&"loader"),
            "HCL query must capture 'loader' (not the keyword 'resource') for resource block; got: {name_list:?}"
        );
        assert!(
            !name_list.contains(&"resource"),
            "HCL query must NOT capture the keyword 'resource' as a symbol name; got: {name_list:?}"
        );

        // Must capture "region" for variable block.
        assert!(
            name_list.contains(&"region"),
            "HCL query must capture 'region' for variable block; got: {name_list:?}"
        );

        // Must capture "role_arn" for output block.
        assert!(
            name_list.contains(&"role_arn"),
            "HCL query must capture 'role_arn' for output block; got: {name_list:?}"
        );

        // Must capture "locals" for locals block.
        assert!(
            name_list.contains(&"locals"),
            "HCL query must capture 'locals' for locals block; got: {name_list:?}"
        );
    }

    // =========================================================================
    // L1 — Python class_definition kind taxonomy fix (I#19)
    // =========================================================================

    /// `test:python_class_definition_kind_5`
    ///
    /// Baseline (RED): `class_definition` was falling through to the wildcard
    /// match or returning VARIABLE (13). The Python `class Foo: pass` pattern
    /// was classified as kind=20 (Key) in the mnemosyne corpus
    /// (ErrorOccurred, OCRCompleted, MnemosyneApp, BaseScreen, BrowseScansScreen).
    ///
    /// After fix (GREEN): `class_definition` maps to CLASS (5) in
    /// `lsp_symbol_kind_for_node_kind`, and the Python query captures
    /// `class_definition` with its body node, so `node.kind() == "class_definition"`
    /// maps to 5.
    #[test]
    fn test_python_class_definition_kind_5() {
        use streaming_iterator::StreamingIterator as _;

        let source = r"class Foo:
    pass
";
        let cfg = config_for_extension("py").expect("Python config must compile");
        let mut parser = tree_sitter::Parser::new();
        parser.set_language(&cfg.language).expect("set language");
        let tree = parser.parse(source, None).expect("parse");

        let mut cursor = tree_sitter::QueryCursor::new();
        let mut matches = cursor.matches(&cfg.query, tree.root_node(), source.as_bytes());

        let mut class_kind_found = false;
        while let Some(m) = matches.next() {
            for cap in m.captures {
                let cap_name = &cfg.query.capture_names()[cap.index as usize];
                if *cap_name == "def" {
                    let def_kind = cap.node.kind();
                    if def_kind == "class_definition" {
                        let lsp_kind = lsp_symbol_kind_for_node_kind(def_kind);
                        assert_eq!(
                            lsp_kind,
                            lsp_symbol_kind::CLASS,
                            "class_definition must map to SymbolKind::Class (5); got {lsp_kind}"
                        );
                        class_kind_found = true;
                    }
                }
            }
        }

        assert!(
            class_kind_found,
            "Python query must emit def_kind='class_definition' for 'class Foo:' pattern"
        );
    }

    // =========================================================================
    // L2 — Go type_alias kind taxonomy fix (I#17b)
    // =========================================================================

    /// `test:go_type_alias_kind_21`
    ///
    /// Baseline (RED): `type_alias` (the @def node from Go `type X = Y` patterns)
    /// was mapping to TYPE_PARAMETER (26) in the kind match. This matched the
    /// previous K2 work which split type_spec into interface_type (→11) and
    /// struct_type (→23), but the fallthrough type_alias path still mapped
    /// to TYPE_PARAMETER.
    ///
    /// After fix (GREEN): `type_alias` maps to VARIABLE (21) — a better
    /// classification than TypeParameter and semantically closer to an alias.
    /// Alternative: could use Constant (14) if the codebase considers aliases
    /// as immutable. Variable (21) is used here because:
    /// - LSP spec doesn't have a dedicated "Alias" kind
    /// - Variable is used in some implementations for type aliases
    /// - It provides a type classification separate from pure TypeParameters
    ///   (which represent generics like `[T]` in function signatures)
    #[test]
    fn test_go_type_alias_kind_21() {
        use streaming_iterator::StreamingIterator as _;

        let source = r"package main

type Foo = Bar

type Reader interface {
    Read(p []byte) (n int, err error)
}
";
        let cfg = config_for_extension("go").expect("Go config must compile");
        let mut parser = tree_sitter::Parser::new();
        parser.set_language(&cfg.language).expect("set language");
        let tree = parser.parse(source, None).expect("parse");

        let mut cursor = tree_sitter::QueryCursor::new();
        let mut matches = cursor.matches(&cfg.query, tree.root_node(), source.as_bytes());

        let mut alias_kind_found = false;
        while let Some(m) = matches.next() {
            let mut name = "";
            let mut def_kind = "";
            for cap in m.captures {
                let cap_name = &cfg.query.capture_names()[cap.index as usize];
                let text = &source[cap.node.start_byte()..cap.node.end_byte()];
                if *cap_name == "name" {
                    name = text;
                } else if *cap_name == "def" {
                    def_kind = cap.node.kind();
                }
            }
            if def_kind == "type_alias" && name == "Foo" {
                let lsp_kind = lsp_symbol_kind_for_node_kind(def_kind);
                assert_eq!(
                    lsp_kind,
                    lsp_symbol_kind::VARIABLE,
                    "type_alias must map to SymbolKind::Variable (13) not TypeParameter (26); got {lsp_kind}"
                );
                alias_kind_found = true;
            }
        }

        assert!(
            alias_kind_found,
            "Go query must emit def_kind='type_alias' for 'type Foo = Bar' pattern"
        );
    }

    /// `test:go_type_alias_distinct_from_type_parameter`
    ///
    /// Verifies that a Go generic type parameter (like `[T any]` in a generic
    /// function) gets kind=26 (TypeParameter), while an alias `type Foo = Bar`
    /// gets kind=21 (Variable). This documents the distinction: generics stay
    /// as TypeParameter, aliases are Variable.
    #[test]
    fn test_go_type_alias_distinct_from_type_parameter() {
        use streaming_iterator::StreamingIterator as _;

        let source = r"package main

type Foo = Bar

func generic[T any](x T) {
}
";
        let cfg = config_for_extension("go").expect("Go config must compile");
        let mut parser = tree_sitter::Parser::new();
        parser.set_language(&cfg.language).expect("set language");
        let tree = parser.parse(source, None).expect("parse");

        let mut cursor = tree_sitter::QueryCursor::new();
        let mut matches = cursor.matches(&cfg.query, tree.root_node(), source.as_bytes());

        let mut alias_found = false;
        let mut alias_kind = 0u32;

        while let Some(m) = matches.next() {
            let mut name = "";
            let mut def_kind = "";
            for cap in m.captures {
                let cap_name = &cfg.query.capture_names()[cap.index as usize];
                let text = &source[cap.node.start_byte()..cap.node.end_byte()];
                if *cap_name == "name" {
                    name = text;
                } else if *cap_name == "def" {
                    def_kind = cap.node.kind();
                }
            }
            if def_kind == "type_alias" && name == "Foo" {
                alias_kind = lsp_symbol_kind_for_node_kind(def_kind);
                alias_found = true;
            }
        }

        assert!(
            alias_found,
            "Go query must emit 'type Foo = Bar' as type_alias; got none"
        );
        assert_eq!(
            alias_kind,
            lsp_symbol_kind::VARIABLE,
            "type_alias 'Foo' must be kind=13 (Variable), got {alias_kind}"
        );

        // Note: This test does NOT check generic type parameters because
        // the current Go query does not capture them — it only captures
        // top-level definitions. Generic parameters in function signatures
        // are part of the function_declaration's syntax but not extracted
        // as separate definitions, so they will not appear in the query results.
        // This is the intended behavior; generics are not searchable symbols
        // in the chunker pipeline.
    }
}