/**
 * Language Provider interface — the complete capability contract for a supported language.
 *
 * Each language implements this interface in a single file under `languages/`.
 * The pipeline accesses all per-language behavior through this interface.
 *
 * Design pattern: Strategy pattern with compile-time exhaustiveness.
 * The providers table in `languages/index.ts` uses `satisfies Record<SupportedLanguages, LanguageProvider>`
 * so adding a language to the enum without creating a provider is a compiler error.
 */
import type { SupportedLanguages, MroStrategy, CaptureMatch, BindingRef, TypeRef, Scope, ScopeId, ScopeKind, ScopeTree, ParsedImport, ParsedTypeBinding, SymbolDefinition, Callsite, WorkspaceIndex } from '../../_shared/index.js';
import type { LanguageTypeConfig } from './type-extractors/types.js';
import type { CallRouter } from './call-routing.js';
import type { CallExtractor } from './call-types.js';
import type { ClassExtractor } from './class-types.js';
import type { ExportChecker } from './export-detection.js';
import type { FieldExtractor } from './field-extractor.js';
import type { MethodExtractor } from './method-types.js';
import type { VariableExtractor } from './variable-types.js';
import type { ImportResolverFn } from './import-resolvers/types.js';
import type { SyntaxNode } from './utils/ast-helpers.js';
import type { NodeLabel } from '../../_shared/index.js';
/** Tree-sitter query captures: capture name → AST node (or undefined if not captured). */
export type CaptureMap = Record<string, SyntaxNode | undefined>;
/** Configuration for AST-based framework detection patterns. */
export interface AstFrameworkPatternConfig {
    framework: string;
    entryPointMultiplier: number;
    reason: string;
    patterns: string[];
}
/**
 * Everything a language needs to provide.
 * Required fields must be explicitly set; optional fields have defaults
 * applied by defineLanguage().
 */
interface LanguageProviderConfig {
    readonly id: SupportedLanguages;
    /** File extensions that map to this language (e.g., ['.ts', '.tsx']) */
    readonly extensions: readonly string[];
    /** Entry-point function name patterns specific to this language.
     *  Merged with universal patterns at runtime for process detection scoring.
     *  Default: [] (only universal patterns apply). */
    readonly entryPointPatterns?: readonly RegExp[];
    /** AST-based framework detection patterns for this language.
     *  Used by detectFrameworkFromAST to identify framework entry points.
     *  Default: [] (no AST framework detection for this language). */
    readonly astFrameworkPatterns?: readonly AstFrameworkPatternConfig[];
    /** Parse strategy: 'tree-sitter' (default) uses AST parsing via tree-sitter.
     *  'standalone' means the language has its own regex-based processor and
     *  should be skipped by the tree-sitter pipeline (e.g., COBOL, Markdown). */
    readonly parseStrategy?: 'tree-sitter' | 'standalone';
    /** Tree-sitter query strings for definitions, imports, calls, heritage.
     *  Required for tree-sitter languages; empty string for standalone processors. */
    readonly treeSitterQueries: string;
    /**
     * Optional source-text transform that runs **before** tree-sitter parses the file.
     *
     * Used to elide language constructs that confuse the grammar without affecting
     * source-position fidelity — e.g., Unreal Engine reflection macros (`UCLASS`,
     * `UFUNCTION`, `MODULENAME_API`) in C++ headers that prevent the parser from
     * recognising class/function names correctly.
     *
     * **Length / position preservation:** the returned string MUST have the same
     * JavaScript `.length` as the input AND preserve every newline (`\n`/`\r`)
     * position byte-for-byte. Implementations replace elided characters with
     * ASCII spaces while leaving newlines untouched. With this contract:
     *
     *   - tree-sitter's reported `startPosition.row`/`startPosition.column`
     *     match the original file exactly (line/column come from newline counts)
     *   - `startIndex`/`endIndex` byte offsets match the original file exactly
     *     **when the elided range is pure ASCII** (UTF-16 `.length` equals UTF-8
     *     byte length only for ASCII).
     *
     * Implementations targeting languages where elided ranges may contain
     * non-ASCII content must therefore preserve byte length, not just `.length`,
     * if downstream code uses `startIndex` to slice the original UTF-8 bytes.
     * The current C++ UE-macro preprocessor relies on the practical fact that
     * UE reflection macros and module-export tokens are ASCII-only.
     *
     * Must be a pure function — same input always yields the same output. Called
     * once per file, on every code path that re-parses (parsing-processor, import
     * processor, heritage processor, call processor, parse worker).
     *
     * Default: undefined (no preprocessing — `file.content` is parsed verbatim).
     */
    readonly preprocessSource?: (sourceText: string, filePath: string) => string;
    /** Type extraction: declarations, initializers, for-loop bindings */
    readonly typeConfig: LanguageTypeConfig;
    /** Export detection: is this AST node a public/exported symbol? */
    readonly exportChecker: ExportChecker;
    /** Import resolution: resolves raw import path to file system path */
    readonly importResolver: ImportResolverFn;
    /** Call routing for languages that express imports/heritage as calls (e.g., Ruby).
     *  Default: no routing (all calls are normal call expressions). */
    readonly callRouter?: CallRouter;
    /** Language-specific transformation of raw import path text before resolution.
     *  Called after sanitization. E.g., Kotlin appends wildcard suffixes.
     *  Default: undefined (no preprocessing). */
    readonly importPathPreprocessor?: (cleaned: string, importNode: SyntaxNode) => string;
    /** Resolve a container node during enclosing-owner tree walks.
     *  Called when a CLASS_CONTAINER_TYPES node is found while walking up.
     *  - Return a different SyntaxNode to remap the container (e.g., Ruby
     *    singleton_class → enclosing class/module).
     *  - Return null to skip this container and keep walking up.
     *  - Omit (undefined) to use the container node as-is (default).
     *  Default: undefined (no remapping). */
    readonly resolveEnclosingOwner?: (node: SyntaxNode) => SyntaxNode | null;
    /** Resolve the enclosing function name + label from an AST ancestor node
     *  that is NOT a standard FUNCTION_NODE_TYPE.  For languages where the
     *  function body is a sibling of the signature (e.g. Dart: function_body ↔
     *  function_signature are siblings under program/class_body), the default
     *  parent walk cannot find the enclosing function.  This hook lets the
     *  language provider inspect each ancestor and return the resolved result.
     *  Return null to continue the default walk.
     *  Default: undefined (standard parent walk only). */
    readonly enclosingFunctionFinder?: (ancestorNode: SyntaxNode) => {
        funcName: string;
        label: NodeLabel;
    } | null;
    /**
     * Extract a per-language template-constraint payload for a templated
     * function / method definition. Used by `parsing-processor` to
     * disambiguate same-name same-arity overloads whose distinguishing
     * signal is their template constraints rather than their parameter
     * types — the canonical C++ SFINAE case (issue #1579):
     *
     *   template<class T, std::enable_if_t<is_integral_v<T>, int> = 0>
     *   void process(T);   // overload A
     *
     *   template<class T, std::enable_if_t<is_floating_point_v<T>, int> = 0>
     *   void process(T);   // overload B
     *
     * Both overloads' `parameterTypes` collapse to `['T']`, so without a
     * constraint fingerprint in the graph node ID they merge into one
     * Function node and the resolver only ever sees one candidate to
     * narrow. The hook's return value is stamped onto the node's ID via
     * `templateConstraintsIdTag()` AND stored on the node's
     * `templateConstraints` property so `resolveDefGraphId` can look up
     * the right overload by re-hashing the def's constraints at resolve
     * time.
     *
     * Returns the opaque payload (any JSON-serializable shape — the
     * producing adapter owns it; shared code MUST NOT inspect) or
     * `undefined` when no constraints exist / the node isn't a templated
     * function. Languages without SFINAE / concept semantics leave this
     * undefined and the disambiguation is a pass-through.
     */
    readonly extractTemplateConstraints?: (definitionNode: SyntaxNode) => unknown;
    /** Override the default node label for definition.function captures.
     *  Return null to skip (C/C++ duplicate), a different label to reclassify
     *  (e.g., 'Method' for Kotlin), or defaultLabel to keep as-is.
     *  Default: undefined (standard label assignment). */
    readonly labelOverride?: (functionNode: SyntaxNode, defaultLabel: NodeLabel) => NodeLabel | null;
    /** MRO strategy for multiple inheritance resolution.
     *  Default: 'first-wins'. */
    readonly mroStrategy?: MroStrategy;
    /** Call extractor for extracting call site information (calledName, callForm,
     *  receiverName, argCount, mixed chains) from @call / @call.name captures.
     *  Produced by createCallExtractor() with a per-language CallExtractionConfig.
     *  Default: undefined — if unset, no calls are extracted for this language.
     *  All tree-sitter providers MUST supply this. */
    readonly callExtractor?: CallExtractor;
    /** Field extractor for extracting field/property definitions from class/struct
     *  declarations. Produces FieldInfo[] with name, type, visibility, static,
     *  readonly metadata. Default: undefined (no field extraction). */
    readonly fieldExtractor?: FieldExtractor;
    /** Method extractor for extracting method/function definitions from class/struct/interface
     *  declarations. Produces MethodInfo[] with name, parameters, visibility, isAbstract,
     *  isFinal, annotations metadata. Default: undefined (no method extraction). */
    readonly methodExtractor?: MethodExtractor;
    /** Variable extractor for extracting metadata from module/file-scoped variable,
     *  constant, and static declarations. Produces VariableInfo with type, visibility,
     *  isConst, isStatic, isMutable metadata. Default: undefined (no variable extraction). */
    readonly variableExtractor?: VariableExtractor;
    /** Class/type extractor for deriving canonical qualified names for class-like symbols.
     *  Uses the same provider-driven strategy pattern as method/field extraction so
     *  namespace/package/module rules stay language-specific. */
    readonly classExtractor?: ClassExtractor;
    /** Extract a semantic description for a definition node (e.g., PHP Eloquent
     *  property arrays, relation method descriptions).
     *  Default: undefined (no description extraction). */
    readonly descriptionExtractor?: (nodeLabel: NodeLabel, nodeName: string, captureMap: CaptureMap) => string | undefined;
    /** Detect if a file contains framework route definitions (e.g., Laravel routes.php).
     *  When true, the worker extracts routes via the language's route extraction logic.
     *  Default: undefined (no route files). */
    readonly isRouteFile?: (filePath: string) => boolean;
    /** Built-in/stdlib names that should be filtered from the call graph for this language.
     *  Default: undefined (no language-specific filtering). */
    readonly builtInNames?: ReadonlySet<string>;
    /**
     * Emit scope captures from raw source, **pre-grouped per tree-sitter
     * query match**. Tree-sitter-based providers run a scope query
     * (embedded as a string constant in each language's `query.ts`) and
     * emit one `CaptureMatch` per query match; standalone providers
     * (COBOL) emit matches from a regex tagger. The return shape is
     * parser-agnostic: the central `ScopeExtractor` consumes
     * `CaptureMatch[]` without knowing which parser produced them.
     *
     * **Pre-grouping is the provider's job.** The extractor expects each
     * `CaptureMatch` to correspond to one logical match — e.g., an import
     * statement match carries `@import.statement` + `@import.source` +
     * `@import.name` keyed under their capture names. Providers MUST
     * preserve the tree-sitter match boundaries so the extractor's topic
     * routing (scope / declaration / import / type-binding / reference)
     * lands on coherent records.
     *
     * Required for any provider participating in scope-based resolution
     * (the sole resolution path).
     *
     * **Sync return.** Tree-sitter query execution and COBOL's regex
     * tagger are both synchronous; no current or foreseeable provider
     * needs async work inside this hook. The sync signature lets
     * `parse-worker.ts` (#920) invoke it inline in its already-sync
     * per-file loop without cascading `async` through the batch pipeline.
     *
     * Default: undefined (no scope-based captures emitted for this language).
     */
    readonly emitScopeCaptures?: (sourceText: string, filePath: string, 
    /**
     * Optional pre-parsed tree-sitter Tree the caller has already
     * produced (e.g. from the parse phase's AST cache). When supplied,
     * the provider SHOULD skip its own `parser.parse(sourceText)` and
     * run its capture query against the supplied tree directly. Typed
     * as `unknown` here to avoid leaking the tree-sitter dependency
     * into the provider contract — the provider casts at use site.
     * Cache miss (parameter omitted or undefined) is always safe and
     * MUST trigger a fresh parse.
     */
    cachedTree?: unknown, 
    /**
     * Optional metadata about how `sourceText` was produced.
     *
     * Most providers ignore this and treat `sourceText` as full file content.
     * Vue uses it to distinguish:
     *   - `full-file`: full `.vue` SFC source
     *   - `pre-extracted-script`: worker-preprocessed bare `<script>` content
     *
     * Default: `{ sourceKind: 'full-file' }`.
     */
    sourceMeta?: {
        readonly sourceKind?: 'full-file' | 'pre-extracted-script';
    }) => readonly CaptureMatch[];
    /**
     * Snapshot the capture-time side-channel state that this provider's
     * `emitScopeCaptures` just populated for `filePath` into module-level maps,
     * returning a plain JSON-serializable value (or `undefined` when there is
     * nothing to carry).
     *
     * Called in the parse worker IMMEDIATELY after `emitScopeCaptures` runs for
     * a file (see `parse-worker.ts`), and the result is stored on the produced
     * `ParsedFile.captureSideChannel`. Scope-resolution on the main thread reuses
     * that serialized `ParsedFile` and skips re-extraction (#1983), so this hook
     * is how the worker-computed marks survive the worker→main boundary and the
     * disk store WITHOUT a main-thread re-parse. The main thread restores them
     * via the matching `ScopeResolver.applyCaptureSideChannel` hook.
     *
     * MUST return plain data (objects / arrays / primitives) so it round-trips
     * through `JSON.stringify` + the parsedfile-store interning reviver.
     *
     * Default: undefined (provider has no capture-time module-level side effects).
     */
    readonly collectCaptureSideChannel?: (filePath: string) => unknown;
    /**
     * Interpret a raw `@import.statement` capture group into a `ParsedImport`.
     * The central finalize algorithm resolves `ParsedImport.targetRaw` to a
     * concrete file via `resolveImportTarget` and materializes the final
     * `ImportEdge` with `targetModuleScope` / `targetDefId` filled in.
     *
     * Required when `emitScopeCaptures` is implemented.
     */
    readonly interpretImport?: (captures: CaptureMatch) => ParsedImport | null;
    /**
     * What is the implicit receiver on a Function scope? For instance methods
     * this is `self`/`this`; for standalone functions it is `null`. Consulted
     * by `Registry.lookup` Step 2 via the `resolveTypeRef` helper.
     *
     * Required for any language with method dispatch (OO semantics).
     *
     * Default: undefined (treated as `null` — no implicit receiver).
     */
    readonly receiverBinding?: (functionScope: Scope) => TypeRef | null;
    /**
     * Interpret a raw type-binding capture (parameter annotation, `self`,
     * assignment with constructor RHS, …) into a `ParsedTypeBinding`. The
     * central extractor attaches the resulting `TypeRef` to the appropriate
     * scope's `typeBindings` map.
     *
     * Default: undefined (falls back to `{ boundName: captures.name, rawTypeName: captures.type, source: 'annotation' }`).
     */
    readonly interpretTypeBinding?: (captures: CaptureMatch) => ParsedTypeBinding | null;
    /**
     * Override the `ScopeKind` assigned to a scope capture. Use when the
     * capture name alone can't resolve the kind (e.g., tree-sitter captures
     * a `block` that is semantically an `Expression` in this language).
     *
     * Default: undefined (the central extractor uses the capture name's
     * suffix — `@scope.function` → `'Function'`, etc.).
     */
    readonly resolveScopeKind?: (captures: CaptureMatch) => ScopeKind | null;
    /**
     * Override where a declaration's name becomes visible. By default the name
     * is bound in the innermost enclosing scope; return a different `ScopeId`
     * to hoist it (JS `var` → enclosing function scope; Ruby `def` inside
     * `begin` → enclosing class scope).
     *
     * Return `null` to delegate to the central default (innermost enclosing
     * scope). This matches the `X | null` convention used by the other optional
     * hooks and supports partial overrides — e.g., a JS provider can return a
     * hoisted scope for `var` declarations and `null` for `let`/`const`, without
     * re-implementing the default lookup.
     *
     * **Purity:** must be a pure function of its inputs — same parameters must
     * yield the same `ScopeId` (or `null`) across invocations. No closure over
     * mutable state. Required so scope-tree construction stays deterministic
     * across re-parses.
     *
     * Default: undefined (the central extractor uses `innermostScope.id`).
     */
    readonly bindingScopeFor?: (declCapture: CaptureMatch, innermostScope: Scope, scopeTree: ScopeTree) => ScopeId | null;
    /**
     * Resolve a `ParsedImport.targetRaw` expression to a concrete file path in
     * the workspace. Language-specific resolution: Python relative imports,
     * JS package.json + node_modules, Go module paths, Java classpath,
     * COBOL COPY paths. Ports today's per-language import resolver.
     *
     * Required when `emitScopeCaptures` is implemented. Ring 2 PKG #922
     * provides the adapter that bridges today's resolver shape to this hook.
     */
    readonly resolveImportTarget?: (parsedImport: ParsedImport, workspaceIndex: WorkspaceIndex) => string | null;
    /**
     * Enumerate the exported names of a file — used by the finalize algorithm
     * to expand `import * from M` into individual `BindingRef`s with
     * `origin: 'wildcard'`.
     *
     * Default: undefined (central finalize walks the target file's
     * `ExportMap.keys()`).
     */
    readonly expandsWildcardTo?: (targetFile: string, workspaceIndex: WorkspaceIndex) => readonly string[];
    /**
     * Decide the scope to which a `ParsedImport` attaches. Most languages
     * attach imports to the nearest enclosing `Module`/`Namespace` scope
     * (the default); some languages allow local imports (Python function-local
     * `from x import Y`, Rust fn-local `use`, TS dynamic `import()`) — return
     * a `Function`/`Block` scope id instead.
     *
     * Return `null` to delegate to the central default (nearest enclosing
     * `Module`/`Namespace`). This matches the `X | null` convention used by
     * the other optional hooks and supports partial overrides — a provider
     * that handles only specific import forms non-standardly can `return null`
     * for the common cases and let the central walk handle them.
     *
     * **Purity:** must be a pure function of its inputs — same parameters must
     * yield the same `ScopeId` (or `null`) across invocations. No closure over
     * mutable state. Required so scope-tree construction stays deterministic
     * across re-parses.
     *
     * Default: undefined (central finalize walks to the nearest enclosing
     * `Module` or `Namespace` scope).
     */
    readonly importOwningScope?: (parsedImport: ParsedImport, innermostScope: Scope, scopeTree: ScopeTree) => ScopeId | null;
    /**
     * Merge local declarations and imported bindings for a single (scope, name)
     * during finalize materialization of a scope's binding table. Language-
     * specific precedence: Python local hides import; TypeScript namespace
     * merging keeps both; Ruby constant resolution has its own rules.
     *
     * Default: undefined (central finalize uses local-first-then-imports,
     * deduping by `DefId`).
     */
    readonly mergeBindings?: (scope: Scope, bindings: readonly BindingRef[]) => readonly BindingRef[];
    /**
     * Classify a `@reference.call` capture as free / member / constructor /
     * index. Preferred path is declarative via capture sub-tags
     * (`@reference.call.free`, etc.); this hook handles the languages where
     * call form can't be decided statically (Ruby bare `foo(x)` is free-or-
     * member until resolved).
     *
     * Default: undefined (central extractor reads capture sub-tag if present;
     * else treats as `'free'`).
     */
    readonly classifyCallForm?: (captures: CaptureMatch, enclosingScope: Scope) => 'free' | 'member' | 'constructor' | 'index';
    /** Order same-name type candidates when a language can index multiple
     * definitions for one logical type. Return null to keep shared ambiguity
     * handling. */
    readonly orderSameNameTypeCandidates?: (params: {
        readonly typeName: string;
        readonly callSiteFilePath: string;
        readonly candidates: readonly SymbolDefinition[];
    }) => readonly SymbolDefinition[] | null;
    /**
     * Is this callable definition compatible with the given call-site arity?
     * Language-specific rules: Python `*args`/`**kwargs`/defaults, JS default
     * params + rest, Kotlin vararg + defaults, Ruby optional/splat/block, Go
     * straight counts, Rust no-variadic-no-defaults.
     *
     * `'incompatible'` is a soft penalty (−0.15 per EvidenceWeights) and is
     * filtered only when at least one `'compatible'` candidate exists;
     * otherwise the incompatible candidate is kept with the penalty so the
     * call-site still links to a best-guess target.
     *
     * Default: undefined (treated as `'unknown'` — no signal either way).
     */
    readonly arityCompatibility?: (def: SymbolDefinition, callsite: Callsite) => 'compatible' | 'unknown' | 'incompatible';
}
/** Runtime type — same as LanguageProviderConfig but with defaults guaranteed present. */
export interface LanguageProvider extends Omit<LanguageProviderConfig, 'mroStrategy'> {
    readonly mroStrategy: MroStrategy;
    /** Check if a name is a built-in/stdlib function that should be filtered from the call graph. */
    readonly isBuiltInName: (name: string) => boolean;
}
/** Define a language provider — required fields must be supplied, optional fields get sensible defaults. */
export declare function defineLanguage(config: LanguageProviderConfig): LanguageProvider;
export {};