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import type { LinterAdapter, LinterDiagnostic } from '../types';
import { mockDocument } from '../utils/mockDocument';
export interface AppliedFix {
originalText: string;
newText: string;
line: number;
}
export interface FixResult {
success: boolean;
attempts: number;
message?: string;
appliedFixes: AppliedFix[];
newText?: string;
}
function applyFixToText(text: string, fix: { range: [number, number]; text: string }): string {
const [start, end] = fix.range;
if (start < 0 || end < start || end > text.length) { return text; }
return text.slice(0, start) + fix.text + text.slice(end);
}
function findClosestFixable(
diagnostics: LinterDiagnostic[],
ruleId: string,
line: number
): LinterDiagnostic | null {
let best: LinterDiagnostic | null = null;
let bestDist = Number.MAX_SAFE_INTEGER;
for (const d of diagnostics) {
if (d.ruleId !== ruleId || !d.fix) { continue; }
const dist = Math.abs(d.range.start.line - line);
if (dist < bestDist) {
bestDist = dist;
best = d;
}
}
return best;
}
function issueStillExists(
diagnostics: LinterDiagnostic[],
ruleId: string,
fixedStart: number,
fixedEnd: number
): boolean {
for (const d of diagnostics) {
if (d.ruleId !== ruleId || !d.fix) { continue; }
const [s, e] = d.fix.range;
if (s < fixedEnd && e > fixedStart) { return true; }
}
return false;
}
export async function fixDiagnostic(
document: vscode.TextDocument,
workingDir: string,
adapter: LinterAdapter,
diag: LinterDiagnostic,
maxIterations: number,
dryRun?: boolean
): Promise<FixResult> {
const originalText = document.getText();
let currentText = originalText;
let prevLine = diag.range.start.line;
let converged = false;
const appliedFixes: AppliedFix[] = [];
for (let round = 1; round <= maxIterations; round++) {
let result;
try {
const mock = mockDocument(currentText, document.languageId, document.fileName);
result = await adapter.check(mock, workingDir);
} catch {
return { success: false, attempts: round, message: 'lint-execution-failed', appliedFixes };
}
const target = findClosestFixable(result.diagnostics, diag.ruleId, prevLine);
if (!target) {
return { success: false, attempts: round, message: 'not-autofixable', appliedFixes };
}
const fix = target.fix!;
const [start, end] = fix.range;
const originalFragment = currentText.slice(start, end);
const nextText = applyFixToText(currentText, fix);
if (nextText === currentText) {
return { success: false, attempts: round, message: 'no-change', appliedFixes };
}
appliedFixes.push({
originalText: originalFragment,
newText: fix.text,
line: target.range.start.line,
});
currentText = nextText;
prevLine = target.range.start.line;
const fixedStart = start;
const fixedEnd = start + fix.text.length;
let verify;
try {
verify = await adapter.check(mockDocument(currentText, document.languageId, document.fileName), workingDir);
} catch {
converged = false;
break;
}
if (!issueStillExists(verify.diagnostics, diag.ruleId, fixedStart, fixedEnd)) {
converged = true;
break;
}
}
if (!converged) {
return { success: false, attempts: maxIterations, message: 'max-iterations', appliedFixes };
}
if (currentText === originalText) {
return { success: true, attempts: 0, appliedFixes };
}
if (dryRun) {
return { success: true, attempts: maxIterations, appliedFixes, newText: currentText };
}
const edit = new vscode.WorkspaceEdit();
const fullRange = new vscode.Range(
document.positionAt(0),
document.positionAt(originalText.length)
);
edit.replace(document.uri, fullRange, currentText);
const applied = await vscode.workspace.applyEdit(edit);
if (!applied) {
return { success: false, attempts: maxIterations, message: 'apply-failed', appliedFixes };
}
return { success: true, attempts: maxIterations, appliedFixes };
}
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