/* @internal */

namespace ts.codefix {

const fixId = "fixUnusedLabel";

const errorCodes = [Diagnostics.Unused_label.code];

registerCodeFix({

errorCodes,

getCodeActions(context) {

const changes = textChanges.ChangeTracker.with(context, t => doChange(t, context.sourceFile, context.span.start));

return [createCodeFixAction(fixId, changes, Diagnostics.Remove_unused_label, fixId, Diagnostics.Remove_all_unused_labels)];

},

fixIds: [fixId],

getAllCodeActions: context => codeFixAll(context, errorCodes, (changes, diag) => doChange(changes, diag.file, diag.start)),

});

function doChange(changes: textChanges.ChangeTracker, sourceFile: SourceFile, start: number): void {

const token = getTokenAtPosition(sourceFile, start);

const labeledStatement = cast(token.parent, isLabeledStatement);

const pos = token.getStart(sourceFile);

const statementPos = labeledStatement.statement.getStart(sourceFile);

// If label is on a separate line, just delete the rest of that line, but not the indentation of the labeled statement.

const end = positionsAreOnSameLine(pos, statementPos, sourceFile) ? statementPos

: skipTrivia(sourceFile.text, findChildOfKind(labeledStatement, SyntaxKind.ColonToken, sourceFile)!.end, /*stopAfterLineBreak*/ true);

changes.deleteRange(sourceFile, { pos, end });

}

}