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* DeclaratorUtils - Shared utilities for extracting information from C++ declarators.
*
* Provides methods for extracting names, types, parameters, and array dimensions
* from C++ parse tree declarator contexts.
*/
/* eslint-disable @typescript-eslint/no-explicit-any */
import SymbolUtils from "../../SymbolUtils";
import type {
DeclaratorContext,
DeclSpecifierSeqContext,
PointerOperatorContext,
} from "../../../2-Parse/cpp/grammar/CPP14Parser";
import IExtractedParameter from "../../shared/IExtractedParameter";
import ParameterExtractorUtils from "../../shared/ParameterExtractorUtils";
class DeclaratorUtils {
/**
* Extract name from a declarator context.
*/
static extractDeclaratorName(declarator: any): string | null {
// Pointer declarator -> noPointerDeclarator
const ptrDecl = declarator.pointerDeclarator?.();
Eif (ptrDecl) {
const noPtr = ptrDecl.noPointerDeclarator?.();
Eif (noPtr) {
return DeclaratorUtils.extractNoPointerDeclaratorName(noPtr);
}
}
// No pointer declarator
const noPtr = declarator.noPointerDeclarator?.();
Iif (noPtr) {
return DeclaratorUtils.extractNoPointerDeclaratorName(noPtr);
}
return null;
}
/**
* Extract name from a noPointerDeclarator context.
*/
static extractNoPointerDeclaratorName(noPtr: any): string | null {
const declId = noPtr.declaratorid?.();
if (declId) {
const idExpr = declId.idExpression?.();
Eif (idExpr) {
const unqualId = idExpr.unqualifiedId?.();
Eif (unqualId) {
const identifier = unqualId.Identifier?.();
if (identifier) {
return identifier.getText();
}
}
}
}
// Recursive case
const innerNoPtr = noPtr.noPointerDeclarator?.();
if (innerNoPtr) {
return DeclaratorUtils.extractNoPointerDeclaratorName(innerNoPtr);
}
// A parenthesized pointer declarator, `(*readLevel)` in `float (*readLevel)()`: its
// name is inside it (#1760 review: such a member had no name, so it was
// dropped)
const innerPtr = noPtr.pointerDeclarator?.();
if (innerPtr) {
return DeclaratorUtils.extractNoPointerDeclaratorName(
innerPtr.noPointerDeclarator(),
);
}
return null;
}
/**
* Check if a declarator represents a function.
*/
static declaratorIsFunction(declarator: any): boolean {
const ptrDecl = declarator.pointerDeclarator?.();
Eif (ptrDecl) {
const noPtr = ptrDecl.noPointerDeclarator?.();
if (noPtr?.parametersAndQualifiers?.()) {
return true;
}
}
const noPtr = declarator.noPointerDeclarator?.();
Iif (noPtr?.parametersAndQualifiers?.()) {
return true;
}
return false;
}
/**
* Extract function parameters from a declarator.
*/
static extractFunctionParameters(declarator: any): IExtractedParameter[] {
const params: IExtractedParameter[] = [];
// Find parametersAndQualifiers from the declarator
let paramsAndQuals: any = null;
const ptrDecl = declarator.pointerDeclarator?.();
Eif (ptrDecl) {
const noPtr = ptrDecl.noPointerDeclarator?.();
paramsAndQuals = noPtr?.parametersAndQualifiers?.();
}
Iif (!paramsAndQuals) {
const noPtr = declarator.noPointerDeclarator?.();
paramsAndQuals = noPtr?.parametersAndQualifiers?.();
}
Iif (!paramsAndQuals) {
return params;
}
// Get parameterDeclarationClause
const paramClause = paramsAndQuals.parameterDeclarationClause?.();
if (!paramClause) {
return params;
}
// Get parameterDeclarationList
const paramList = paramClause.parameterDeclarationList?.();
Iif (!paramList) {
return params;
}
return ParameterExtractorUtils.processParameterList(
paramList,
DeclaratorUtils.extractParameterInfo,
);
}
/**
* Extract parameter info from a single parameter declaration.
*/
static extractParameterInfo(paramDecl: any): IExtractedParameter | null {
// Get the type from declSpecifierSeq
const declSpecSeq = paramDecl.declSpecifierSeq?.();
Iif (!declSpecSeq) {
return null;
}
const baseType = DeclaratorUtils.extractTypeFromDeclSpecSeq(declSpecSeq);
const isConst = declSpecSeq.getText().includes("const");
// Check for pointer in declarator or abstractDeclarator
const declarator = paramDecl.declarator?.();
const abstractDecl = paramDecl.abstractDeclarator?.();
const isPointer =
(declarator && DeclaratorUtils.declaratorHasPointer(declarator)) ||
(abstractDecl &&
DeclaratorUtils.abstractDeclaratorHasPointer(abstractDecl));
// One `*` whatever the declarator spells -- `Dev**` and a reference alike.
// The C extractor keeps the depth; this one never has.
return ParameterExtractorUtils.buildParameterInfo(
declarator,
isPointer ? `${baseType}*` : baseType,
isConst,
false, // isArray - could be enhanced
DeclaratorUtils.extractDeclaratorName,
);
}
/**
* Check if a declarator contains a pointer operator.
*/
static declaratorHasPointer(declarator: any): boolean {
const ptrDecl = declarator.pointerDeclarator?.();
Eif (ptrDecl) {
// Check for pointerOperator children
const ptrOps = ptrDecl.pointerOperator?.();
if (ptrOps && ptrOps.length > 0) {
return true;
}
// Also check getText for *
Iif (ptrDecl.getText().includes("*")) {
return true;
}
}
return false;
}
/**
* Check if an abstract declarator contains a pointer.
*/
static abstractDeclaratorHasPointer(abstractDecl: any): boolean {
// Check for pointerAbstractDeclarator
const ptrAbstract = abstractDecl.pointerAbstractDeclarator?.();
if (ptrAbstract) {
const ptrOps = ptrAbstract.pointerOperator?.();
if (ptrOps && ptrOps.length > 0) {
return true;
}
if (ptrAbstract.getText().includes("*")) {
return true;
}
}
// Simple check for * in the text
if (abstractDecl.getText().includes("*")) {
return true;
}
return false;
}
/**
* The type a data member's declarator records: its base type with the
* declarator's indirection -- a pointer's depth, or a function pointer's
* `T (*)(params)` -- the spellings the C side records (#1760 review: a
* member recorded its specifiers alone, so `uint8_t *buf` was a `uint8_t`
* and `float (*readLevel)()` a `float`). A reference keeps its base type.
*/
static declaredType(baseType: string, declarator: DeclaratorContext): string {
const pointer = declarator.pointerDeclarator();
Iif (!pointer) return baseType;
const params = pointer.noPointerDeclarator().parametersAndQualifiers();
if (params && DeclaratorUtils.isFunctionPointer(declarator)) {
return `${baseType} (*)(${params.getText().slice(1, -1)})`;
}
return (
baseType +
"*".repeat(DeclaratorUtils.starCount(pointer.pointerOperator()))
);
}
/**
* Whether a declarator declares a pointer to a function, `(*readLevel)()`: its
* parameters apply to a parenthesized pointer declarator, where a
* function's apply to its name. A class's member of this shape is a data
* member (#1760 review: it was taken for a member function and dropped).
*/
static isFunctionPointer(declarator: DeclaratorContext): boolean {
const outer = declarator.pointerDeclarator()?.noPointerDeclarator();
const inner = outer?.noPointerDeclarator()?.pointerDeclarator();
return (
outer?.parametersAndQualifiers() != null &&
inner != null &&
DeclaratorUtils.starCount(inner.pointerOperator()) > 0
);
}
/** How many of a declarator's pointer operators are `*`, not `&` */
private static starCount(operators: PointerOperatorContext[]): number {
return operators.filter((op) => op.getText().startsWith("*")).length;
}
/**
* Whether a declaration is `volatile` (#1760 review): the type string below
* keeps simple type specifiers alone, so a `volatile float` variable was
* recorded as `float`, and the typer could not know that reading it has a
* side effect.
*/
static isVolatile(declSpecSeq: DeclSpecifierSeqContext): boolean {
return declSpecSeq
.declSpecifier()
.some(
(spec) =>
spec
.typeSpecifier()
?.trailingTypeSpecifier()
?.cvQualifier()
?.getText() === "volatile",
);
}
/**
* Extract type string from a declSpecifierSeq context.
*/
static extractTypeFromDeclSpecSeq(declSpecSeq: any): string {
const parts: string[] = [];
for (const spec of declSpecSeq.declSpecifier?.() ?? []) {
const typeSpec = spec.typeSpecifier?.();
if (typeSpec) {
const trailingType = typeSpec.trailingTypeSpecifier?.();
if (trailingType) {
const simpleType = trailingType.simpleTypeSpecifier?.();
if (simpleType) {
parts.push(simpleType.getText());
}
}
}
}
return parts.join(" ") || "int";
}
/**
* Extract array dimensions from a declarator.
* Issue #981: Returns (number | string)[] to support macro-sized arrays.
*/
static extractArrayDimensions(declarator: any): (number | string)[] {
// For C++, we need to check both pointer and no-pointer declarators
const ptrDecl = declarator.pointerDeclarator?.();
Eif (ptrDecl) {
const noPtr = ptrDecl.noPointerDeclarator?.();
Eif (noPtr) {
return DeclaratorUtils.extractArrayDimensionsFromNoPtr(noPtr);
}
}
const noPtr = declarator.noPointerDeclarator?.();
Iif (noPtr) {
return DeclaratorUtils.extractArrayDimensionsFromNoPtr(noPtr);
}
return [];
}
/**
* Extract array dimensions from a noPointerDeclarator.
* Issue #981: Returns (number | string)[] to support macro-sized arrays.
*/
static extractArrayDimensionsFromNoPtr(noPtr: any): (number | string)[] {
// Use shared utility for regex-based extraction
return SymbolUtils.parseArrayDimensions(noPtr.getText());
}
}
export default DeclaratorUtils;
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