@mysql/xdevapi/test/unit/ExprParser/shiftExpr.js

MySQL Connector/Node.js - A Node.js driver for MySQL using the X Protocol and X DevAPI.

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 * This program is free software; you can redistribute it and/or modify
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'use strict';

/* eslint-env node, mocha */

const Parser = require('../../../lib/ExprParser');
const expect = require('chai').expect;

describe('ExprParser', () => {
    context('shiftExpr', () => {
        const parser = Parser({ type: Parser.Type.SHIFT_EXPR });

        it('parses a left shift function and its parameters', () => {
            return expect(parser.parse('1 << 2')).to.deep.equal({
                type: 'shiftExpr',
                value: {
                    name: '<<',
                    params: [{
                        type: 'literal',
                        value: 1
                    }, {
                        type: 'literal',
                        value: 2
                    }]
                }
            });
        });

        it('parses a right-shift function and its parameters', () => {
            return expect(parser.parse('4 >> 2')).to.deep.equal({
                type: 'shiftExpr',
                value: {
                    name: '>>',
                    params: [{
                        type: 'literal',
                        value: 4
                    }, {
                        type: 'literal',
                        value: 2
                    }]
                }
            });
        });

        it('parses composable bit shift functions and their parameters', () => {
            return expect(parser.parse('4 >> 2 << 1')).to.deep.equal({
                type: 'shiftExpr',
                value: {
                    name: '<<',
                    params: [{
                        type: 'shiftExpr',
                        value: {
                            name: '>>',
                            params: [{
                                type: 'literal',
                                value: 4
                            }, {
                                type: 'literal',
                                value: 2
                            }]
                        }
                    }, {
                        type: 'literal',
                        value: 1
                    }]
                }
            });
        });

        it('parses composable functions with the correct precedence', () => {
            expect(parser.parse('4 >> 1 + 1')).to.deep.equal({
                type: 'shiftExpr',
                value: {
                    name: '>>',
                    params: [{
                        type: 'literal',
                        value: 4
                    }, {
                        type: 'addSubExpr',
                        value: {
                            name: '+',
                            params: [{
                                type: 'literal',
                                value: 1
                            }, {
                                type: 'literal',
                                value: 1
                            }]
                        }
                    }]
                }
            });
        });
    });
});