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* ArrayInitHelper - Handles array initialization with size inference and fill-all syntax
*
* Issue #644: Extracted from CodeGenerator to reduce file size.
*
* Handles:
* - Array initializers with size inference: u8 data[] <- [1, 2, 3]
* - Fill-all syntax: u8 data[10] <- [0*]
* - Array size validation
*/
import * as Parser from "../../../logic/parser/grammar/CNextParser.js";
import TTypeInfo from "../types/TTypeInfo.js";
/**
* Array initialization tracking state.
*/
interface IArrayInitState {
lastArrayInitCount: number;
lastArrayFillValue: string | undefined;
}
/**
* Result from processing array initialization.
*/
interface IArrayInitResult {
/** Whether this was an array initializer (vs regular expression) */
isArrayInit: boolean;
/** The dimension suffix to add to declaration (e.g., "[3]") */
dimensionSuffix: string;
/** The final initializer value */
initValue: string;
}
/**
* Dependencies required for array initialization.
*/
interface IArrayInitHelperDeps {
/** Type registry for updating inferred dimensions */
typeRegistry: Map<string, TTypeInfo>;
/** Local arrays set for tracking */
localArrays: Set<string>;
/** Array initialization tracking state */
arrayInitState: IArrayInitState;
/** Get/set expected type context */
getExpectedType: () => string | null;
setExpectedType: (type: string | null) => void;
/** Generate expression code */
generateExpression: (ctx: Parser.ExpressionContext) => string;
/** Get type name from type context */
getTypeName: (ctx: Parser.TypeContext) => string;
/** Generate array dimensions */
generateArrayDimensions: (dims: Parser.ArrayDimensionContext[]) => string;
}
/**
* Handles array initialization with size inference and fill-all syntax.
*/
class ArrayInitHelper {
private readonly deps: IArrayInitHelperDeps;
constructor(deps: IArrayInitHelperDeps) {
this.deps = deps;
}
/**
* Process array initialization expression.
* Returns null if not an array initializer pattern.
*
* @param name - Variable name
* @param typeCtx - Type context
* @param expression - Initializer expression
* @param arrayDims - Array dimension contexts
* @param hasEmptyArrayDim - Whether any dimension is empty (for inference)
* @param declaredSize - First dimension size if explicit, null otherwise
*/
processArrayInit(
name: string,
typeCtx: Parser.TypeContext,
expression: Parser.ExpressionContext,
arrayDims: Parser.ArrayDimensionContext[],
hasEmptyArrayDim: boolean,
declaredSize: number | null,
): IArrayInitResult | null {
// Reset and generate initializer
this.deps.arrayInitState.lastArrayInitCount = 0;
this.deps.arrayInitState.lastArrayFillValue = undefined;
const initValue = this._generateArrayInitValue(typeCtx, expression);
// Check if it was an array initializer
if (!this._isArrayInitializer()) {
return null;
}
this.deps.localArrays.add(name);
const dimensionSuffix = hasEmptyArrayDim
? this._processSizeInference(name)
: this._processExplicitSize(arrayDims, declaredSize);
const finalInitValue = this._expandFillAllSyntax(initValue, declaredSize);
return { isArrayInit: true, dimensionSuffix, initValue: finalInitValue };
}
/**
* Generate the array initializer value with proper expected type
*/
private _generateArrayInitValue(
typeCtx: Parser.TypeContext,
expression: Parser.ExpressionContext,
): string {
const typeName = this.deps.getTypeName(typeCtx);
const savedExpectedType = this.deps.getExpectedType();
this.deps.setExpectedType(typeName);
const initValue = this.deps.generateExpression(expression);
this.deps.setExpectedType(savedExpectedType);
return initValue;
}
/**
* Check if the last expression was an array initializer
*/
private _isArrayInitializer(): boolean {
return (
this.deps.arrayInitState.lastArrayInitCount > 0 ||
this.deps.arrayInitState.lastArrayFillValue !== undefined
);
}
/**
* Process size inference for empty array dimension (u8 data[] <- [1, 2, 3])
*/
private _processSizeInference(name: string): string {
if (this.deps.arrayInitState.lastArrayFillValue !== undefined) {
throw new Error(
`Error: Fill-all syntax [${this.deps.arrayInitState.lastArrayFillValue}*] requires explicit array size`,
);
}
// Update type registry with inferred size for .length support
const existingType = this.deps.typeRegistry.get(name);
Eif (existingType) {
existingType.arrayDimensions = [
this.deps.arrayInitState.lastArrayInitCount,
];
}
return `[${this.deps.arrayInitState.lastArrayInitCount}]`;
}
/**
* Process explicit array size with validation
*/
private _processExplicitSize(
arrayDims: Parser.ArrayDimensionContext[],
declaredSize: number | null,
): string {
const dimensionSuffix = this.deps.generateArrayDimensions(arrayDims);
// Validate size matches if not using fill-all
if (
declaredSize !== null &&
this.deps.arrayInitState.lastArrayFillValue === undefined &&
this.deps.arrayInitState.lastArrayInitCount !== declaredSize
) {
throw new Error(
`Error: Array size mismatch - declared [${declaredSize}] but got ${this.deps.arrayInitState.lastArrayInitCount} elements`,
);
}
return dimensionSuffix;
}
/**
* Expand fill-all syntax (e.g., [0*] with size 5 -> {0, 0, 0, 0, 0})
*/
private _expandFillAllSyntax(
initValue: string,
declaredSize: number | null,
): string {
if (
this.deps.arrayInitState.lastArrayFillValue === undefined ||
declaredSize === null
) {
return initValue;
}
const fillVal = this.deps.arrayInitState.lastArrayFillValue;
// C handles {0} correctly, no need to expand
if (fillVal === "0") {
return initValue;
}
const elements = new Array<string>(declaredSize).fill(fillVal);
return `{${elements.join(", ")}}`;
}
}
export default ArrayInitHelper;
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