Function getRangeToExtract

test/fixtures/snapshot/typescript.js:160173–160496

(sourceFile, span, invoked)

             */
            // exported only for tests
            function getRangeToExtract(sourceFile, span, invoked) {
                if (invoked === void 0) { invoked = true; }
                var length = span.length;
                if (length === 0 && !invoked) {
                    return { errors: [ts.createFileDiagnostic(sourceFile, span.start, length, Messages.cannotExtractEmpty)] };
                }
                var cursorRequest = length === 0 && invoked;
                var startToken = ts.findFirstNonJsxWhitespaceToken(sourceFile, span.start);
                var endToken = ts.findTokenOnLeftOfPosition(sourceFile, ts.textSpanEnd(span));
                /* If the refactoring command is invoked through a keyboard action it's safe to assume that the user is actively looking for
                refactoring actions at the span location. As they may not know the exact range that will trigger a refactoring, we expand the
                searched span to cover a real node range making it more likely that something useful will show up. */
                var adjustedSpan = startToken && endToken && invoked ? getAdjustedSpanFromNodes(startToken, endToken, sourceFile) : span;
                // Walk up starting from the the start position until we find a non-SourceFile node that subsumes the selected span.
                // This may fail (e.g. you select two statements in the root of a source file)
                var start = cursorRequest ? getExtractableParent(startToken) : ts.getParentNodeInSpan(startToken, sourceFile, adjustedSpan);
                // Do the same for the ending position
                var end = cursorRequest ? start : ts.getParentNodeInSpan(endToken, sourceFile, adjustedSpan);
                var declarations = [];
                // We'll modify these flags as we walk the tree to collect data
                // about what things need to be done as part of the extraction.
                var rangeFacts = RangeFacts.None;
                var thisNode;
                if (!start || !end) {
                    // cannot find either start or end node
                    return { errors: [ts.createFileDiagnostic(sourceFile, span.start, length, Messages.cannotExtractRange)] };
                }
                if (start.flags & 8388608 /* NodeFlags.JSDoc */) {
                    return { errors: [ts.createFileDiagnostic(sourceFile, span.start, length, Messages.cannotExtractJSDoc)] };
                }
                if (start.parent !== end.parent) {
                    // start and end nodes belong to different subtrees
                    return { errors: [ts.createFileDiagnostic(sourceFile, span.start, length, Messages.cannotExtractRange)] };
                }
                if (start !== end) {
                    // start and end should be statements and parent should be either block or a source file
                    if (!isBlockLike(start.parent)) {
                        return { errors: [ts.createFileDiagnostic(sourceFile, span.start, length, Messages.cannotExtractRange)] };
                    }
                    var statements = [];
                    for (var _i = 0, _a = start.parent.statements; _i < _a.length; _i++) {
                        var statement = _a[_i];
                        if (statement === start || statements.length) {
                            var errors_1 = checkNode(statement);
                            if (errors_1) {
                                return { errors: errors_1 };
                            }
                            statements.push(statement);
                        }
                        if (statement === end) {
                            break;
                        }
                    }
                    if (!statements.length) {
                        // https://github.com/Microsoft/TypeScript/issues/20559
                        // Ranges like [|case 1: break;|] will fail to populate `statements` because
                        // they will never find `start` in `start.parent.statements`.
                        // Consider: We could support ranges like [|case 1:|] by refining them to just