Method _parseSlice

source/python.js:1544–1578

()

                return new ast.List(elts);
            }
            _parseSlice() {
                const elts = [];
                let slice = [null, null, null];
                let index = 0;
                let valid = false;
                this._tokenizer.expect('[');
                while (true) {
                    if (this._tokenizer.accept(':')) {
                        index++;
                        valid = true;
                    } else if (index > 2 || this._tokenizer.match(',') || this._tokenizer.match(']')) {
                        if (!valid || index > 2) {
                            throw new python.Error(`Invalid slice at ${this._location()}`);
                        }
                        elts.push(index === 0 ? slice[0] : new ast.Slice(slice[0], slice[1], slice[2]));
                        slice = [null, null, null];
                        index = 0;
                        if (this._tokenizer.accept(']')) {
                            break;
                        }
                        this._tokenizer.expect(',');
                    } else {
                        const expression = this._parseExpression();
                        if (expression === null) {
                            throw new python.Error(`Expected expression ${this._location()}`);
                        }
                        slice[index] = expression;
                        valid = true;
                    }
                }
                if (elts.length > 1) {
                    return new ast.Tuple(elts);
                }
                return elts[0];
            }
            _parseName(required) {
                const token = this._tokenizer.peek();
                if (token.type === 'id' && !token.keyword) {