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* Builder for IAssignmentContext (ADR-065).
*
* Extracts all context from an assignment statement parse tree needed for
* classification and code generation.
*
* ## The context carries no parse nodes (#1445 box 3)
*
* It used to carry five: the statement, the target, the value, the subscript
* expressions and the postfix operations. Every consumer of those five asked a
* bounded set of questions -- render this target, analyze it for bit access,
* what type is the value, fold this subscript, how many subscripts are there --
* so the context carries the answers and the renders, and the walk stays here.
*
* That also fixes an under-measurement. `parse-tree-confined-to-parser` counts
* modules that NAME a parse type, so the four handler files that read
* `ctx.valueCtx` and `ctx.subscripts[0]` off this interface held parse trees
* without ever being counted -- the contract was acting as an unsanctioned
* carrier. They hold no nodes now, and the two modules that did name types are
* out of the population for real rather than by spelling.
*/
import * as Parser from "../../PARSE/2-Parse/grammar/CNextParser";
import type IChainStep from "../../types/IChainStep";
import IAssignmentContext from "./types/IAssignmentContext";
import IBitAccessAnalysis from "../../types/IBitAccessAnalysis";
import TPlannedTargetOp from "../../types/TPlannedTargetOp";
import type IChainBase from "./types/IChainBase";
import type TranspileState from "../TranspileState";
/**
* Dependencies for building context.
*/
interface IContextBuilderDeps {
/** #1668: what the target writes, bound where it was typed */
readonly target: IChainBase;
/**
* 2.3 Render's per-file working state (#1452 box 4), carried onto the built
* context so the handlers that receive it have a channel to the same
* instance rather than reaching for a mutable static.
*/
readonly state: TranspileState;
/**
* The value expression, already generated.
*
* Takes no argument: `CodeGenerator.generateAssignment` renders the
* right-hand side inside its own `withExpectedType` window and passes the
* result, so this must not render it a second time.
*/
generatedValue(): string;
/**
* Generate the fully-resolved assignment target with scope prefixes, or
* its first `opCount` postfix operations
*/
generateAssignmentTarget(
ctx: Parser.AssignmentTargetContext,
opCount?: number,
): string;
/** ADR-034: analyze the target's member chain for bit access */
analyzeMemberChainForBitAccess(
ctx: Parser.AssignmentTargetContext,
lastStep: IChainStep | undefined,
): IBitAccessAnalysis;
/** Generate a subscript expression */
generateExpression(ctx: Parser.ExpressionContext): string;
/** Fold an expression to a compile-time constant */
tryEvaluateConstant(ctx: Parser.ExpressionContext): number | undefined;
/** The value expression's essential type */
expressionType(ctx: Parser.ExpressionContext): string | null;
/** The value expression's integer type */
integerExpressionType(ctx: Parser.ExpressionContext): string | null;
/** #1668: whether any operand of the value expression is floating */
hasFloatingOperand(ctx: Parser.ExpressionContext): boolean;
/**
* ADR-001's assignment operator mapping, injected rather than imported.
*
* This module moved to 2.2 Plan (#1445 box 3) and `AssignmentOperatorMapper`
* did not: it is the one place a C-Next operator BECOMES its C form, which
* is text, and `plan-cannot-import-render` is `error` and `reachable`. It
* arrives through the deps the same way the seven render thunks above do --
* that is what this interface has always been for, not a new indirection
* invented to satisfy the rule.
*/
toCOperator(cnextOp: string, line: number | undefined): string;
}
/**
* Result from extracting identifiers and subscripts from assignment target.
*/
interface ITargetExtraction {
identifiers: string[];
subscripts: Parser.ExpressionContext[];
ops: TPlannedTargetOp[];
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[] = [];
// All patterns now have a base IDENTIFIER
Eif (targetCtx.IDENTIFIER()) {
identifiers.push(targetCtx.IDENTIFIER()!.getText());
}
return {
identifiers,
subscripts: [],
ops: [],
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,
deps: IContextBuilderDeps,
): void {
for (const op of postfixOps) {
if (op.IDENTIFIER()) {
const name = op.IDENTIFIER()!.getText();
extraction.identifiers.push(name);
extraction.hasMemberAccess = true;
extraction.ops.push({ kind: "member", name });
} 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;
extraction.ops.push({
kind: "subscript",
indexCount: exprs.length,
// A thunk: most chains are not bit accesses, and the walk that reads
// these decides that from `CodeGenState` alone. Generating an index up
// front would queue a pending temp for every chain it then rejects.
renderIndexes: () => exprs.map((expr) => deps.generateExpression(expr)),
foldWidth: () =>
exprs.length === 2 ? deps.tryEvaluateConstant(exprs[1]) : undefined,
});
}
}
}
/**
* 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 = deps.toCOperator(cnextOp, operatorCtx.start?.line);
const isCompound = cOp !== "=";
const generatedValue = deps.generatedValue();
// 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, deps);
const {
identifiers,
subscripts,
ops,
hasMemberAccess,
hasArrayAccess,
lastSubscriptExprCount,
} = extraction;
// 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 {
state: deps.state,
renderTarget: () => deps.generateAssignmentTarget(targetCtx),
renderBitTarget: () =>
deps.generateAssignmentTarget(targetCtx, postfixOps.length - 1),
analyzeTargetForBitAccess: () =>
deps.analyzeMemberChainForBitAccess(targetCtx, deps.target.last),
targetLine: targetCtx.start?.line,
hasValue: valueCtx !== null,
valueExpressionType: () => deps.expressionType(valueCtx),
valueIntegerType: () => deps.integerExpressionType(valueCtx),
valueHasFloatingOperand: () =>
valueCtx !== null && deps.hasFloatingOperand(valueCtx),
foldValue: () => deps.tryEvaluateConstant(valueCtx),
identifiers,
subscriptCount: subscripts.length,
renderSubscript: (index) => deps.generateExpression(subscripts[index]),
foldSubscript: (index) => deps.tryEvaluateConstant(subscripts[index]),
postfixOps: ops,
hasThis,
hasGlobal,
hasMemberAccess,
hasArrayAccess,
postfixOpsCount: postfixOps.length,
cnextOp,
cOp,
isCompound,
generatedValue,
resolvedTarget,
resolvedBaseIdentifier,
target: deps.target,
memberAccessDepth,
subscriptDepth,
lastSubscriptExprCount,
isSimpleIdentifier,
isSimpleThisAccess,
isSimpleGlobalAccess,
};
}
export default buildAssignmentContext;
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