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* Builder for IAssignmentContext (ADR-109).
*
* Extracts all context from an assignment statement parse tree
* needed for classification and code generation.
*/
import * as Parser from "../../../logic/parser/grammar/CNextParser";
import IAssignmentContext from "./IAssignmentContext";
import TTypeInfo from "../types/TTypeInfo";
import ASSIGNMENT_OPERATOR_MAP from "../../../../utils/constants/OperatorMappings";
/**
* Dependencies for building context.
*/
interface IContextBuilderDeps {
/** Type registry: variable name -> type info */
readonly typeRegistry: ReadonlyMap<string, TTypeInfo>;
/** Generate C expression for a value */
generateExpression(ctx: Parser.ExpressionContext): string;
/** Generate fully-resolved assignment target with scope prefixes */
generateAssignmentTarget(ctx: Parser.AssignmentTargetContext): string;
/** Check if an identifier is a known register (for skipping resolution) */
isKnownRegister(name: string): boolean;
/** Current scope name (for scoped register detection) */
currentScope: string | null;
}
/**
* Result from extracting identifiers and subscripts from assignment target.
*/
interface ITargetExtraction {
identifiers: string[];
subscripts: Parser.ExpressionContext[];
hasMemberAccess: boolean;
hasArrayAccess: boolean;
/** Number of expressions in the last subscript operation */
lastSubscriptExprCount: number;
}
/**
* Extract the base identifier from a resolved target string.
* Removes subscripts ([...]) from the resolved target.
* Examples:
* "ArrayBug_data[0]" -> "ArrayBug_data"
* "matrix[i][j]" -> "matrix"
* "item.field" -> "item"
* "Motor_speed" -> "Motor_speed"
*/
function extractResolvedBaseIdentifier(resolvedTarget: string): string {
// Assumes resolvedTarget always starts with a valid identifier (not empty or starting with [ . ->)
// as generated by generateAssignmentTarget()
const bracketIndex = resolvedTarget.indexOf("[");
const dotIndex = resolvedTarget.indexOf(".");
const arrowIndex = resolvedTarget.indexOf("->");
// Find the earliest terminator
let endIndex = resolvedTarget.length;
if (bracketIndex !== -1 && bracketIndex < endIndex) {
endIndex = bracketIndex;
}
if (dotIndex !== -1 && dotIndex < endIndex) {
endIndex = dotIndex;
}
if (arrowIndex !== -1 && arrowIndex < endIndex) {
endIndex = arrowIndex;
}
return resolvedTarget.substring(0, endIndex);
}
/**
* Extract base identifier from assignment target.
* With unified grammar, all patterns use IDENTIFIER postfixTargetOp*.
*/
function extractBaseIdentifier(
targetCtx: Parser.AssignmentTargetContext,
): ITargetExtraction {
const identifiers: string[] = [];
const subscripts: Parser.ExpressionContext[] = [];
// All patterns now have a base IDENTIFIER
Eif (targetCtx.IDENTIFIER()) {
identifiers.push(targetCtx.IDENTIFIER()!.getText());
}
return {
identifiers,
subscripts,
hasMemberAccess: false,
hasArrayAccess: false,
lastSubscriptExprCount: 0,
};
}
/**
* Process postfix operations and update extraction result.
* SonarCloud S3776: Extracted from buildAssignmentContext().
*/
function processPostfixOps(
postfixOps: Parser.PostfixTargetOpContext[],
extraction: ITargetExtraction,
): void {
for (const op of postfixOps) {
if (op.IDENTIFIER()) {
extraction.identifiers.push(op.IDENTIFIER()!.getText());
extraction.hasMemberAccess = true;
} else {
const exprs = op.expression();
for (const expr of exprs) {
extraction.subscripts.push(expr);
}
extraction.hasArrayAccess = true;
// Track the expression count of the last subscript operation
extraction.lastSubscriptExprCount = exprs.length;
}
}
}
/**
* Build an IAssignmentContext from a parse tree.
* SonarCloud S3776: Refactored to use helper functions.
*/
function buildAssignmentContext(
ctx: Parser.AssignmentStatementContext,
deps: IContextBuilderDeps,
): IAssignmentContext {
const targetCtx = ctx.assignmentTarget();
const valueCtx = ctx.expression();
// Extract operator info
const operatorCtx = ctx.assignmentOperator();
const cnextOp = operatorCtx.getText();
const cOp = ASSIGNMENT_OPERATOR_MAP[cnextOp] || "=";
const isCompound = cOp !== "=";
// Generate value expression
const generatedValue = deps.generateExpression(valueCtx);
// Generate fully-resolved target (with scope prefixes)
const resolvedTarget = deps.generateAssignmentTarget(targetCtx);
// Extract resolved base identifier for type lookups
// Removes subscripts ([...]) and member access (. or ->) from the end
const resolvedBaseIdentifier = extractResolvedBaseIdentifier(resolvedTarget);
// Extract target info
const hasGlobal = targetCtx.GLOBAL() !== null;
const hasThis = targetCtx.THIS() !== null;
const postfixOps = targetCtx.postfixTargetOp();
// Extract base identifier and process postfix operations
const extraction = extractBaseIdentifier(targetCtx);
processPostfixOps(postfixOps, extraction);
const {
identifiers,
subscripts,
hasMemberAccess,
hasArrayAccess,
lastSubscriptExprCount,
} = extraction;
// Get first identifier type info
const firstId = identifiers[0] ?? "";
const firstIdTypeInfo = deps.typeRegistry.get(firstId) ?? null;
// Compute derived properties
const memberAccessDepth = identifiers.length - 1;
const subscriptDepth = subscripts.length;
const isSimpleIdentifier =
!hasGlobal &&
!hasThis &&
!hasMemberAccess &&
!hasArrayAccess &&
identifiers.length === 1;
const isSimpleThisAccess = hasThis && postfixOps.length === 0;
const isSimpleGlobalAccess = hasGlobal && postfixOps.length === 0;
return {
statementCtx: ctx,
targetCtx,
valueCtx,
identifiers,
subscripts,
postfixOps,
hasThis,
hasGlobal,
hasMemberAccess,
hasArrayAccess,
postfixOpsCount: postfixOps.length,
cnextOp,
cOp,
isCompound,
generatedValue,
resolvedTarget,
resolvedBaseIdentifier,
firstIdTypeInfo,
memberAccessDepth,
subscriptDepth,
lastSubscriptExprCount,
isSimpleIdentifier,
isSimpleThisAccess,
isSimpleGlobalAccess,
};
}
export default buildAssignmentContext;
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