forest-cli/dist/services/schema/update/analyzer/sequelize-default-value.js

The Lumberjacks' toolbelt is the Forest CLI which makes easy to manage your back office application directly from the terminal.

const Sequelize = require('sequelize');
/**
 * Convert SQL expression to Javascript value when possible.
 * Otherwise, default to using Sequelize.literal(...) which will always work.
 */
class DefaultValueExpression {
    constructor(dialect, type, expression) {
        this.dialect = dialect;
        this.type = type;
        this.expression = expression;
    }
    parse() {
        if (this.expression === null || this.expression === undefined) {
            return null;
        }
        try {
            let result;
            if (this.dialect === 'postgres') {
                result = this.parsePostgres();
            }
            else if (this.dialect === 'mysql') {
                result = this.parseMysql();
            }
            else if (this.dialect === 'mssql') {
                result = this.parseMsSql();
            }
            if (result === undefined) {
                result = this.parseGeneric();
            }
            return result !== undefined ? result : Sequelize.literal(this.expression);
        }
        catch (e) {
            return Sequelize.literal(this.expression);
        }
    }
    parseGeneric() {
        const nulls = ['NULL'];
        const falses = ['false', 'FALSE', "b'0'", '((0))'];
        const trues = ['true', 'TRUE', "b'1'", '((1))'];
        const isDate = ['TIMESTAMP', 'DATETIME', 'DATE', 'TIME'];
        let result;
        if (nulls.includes(this.expression) || this.expression.startsWith('NULL::')) {
            result = null;
        }
        else if (falses.includes(this.expression)) {
            result = false;
        }
        else if (trues.includes(this.expression)) {
            result = true;
        }
        else if (/^-?\d+(\.\d+)?$/.test(this.expression)) {
            result = Number.parseFloat(this.expression);
            if (result.toString() !== this.expression) {
                result = Sequelize.literal(this.expression);
            }
        }
        else if (/^'.*'$/.test(this.expression)) {
            result = this.expression.substr(1, this.expression.length - 2).replace(/''/g, "'");
        }
        else if (isDate) {
            result = this.literalUnlessMatch(/^(\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2})|(\d{4}-\d{2}-\d{2})|(\d{2}:\d{2}:\d{2})$/);
        }
        return result;
    }
    parseMysql() {
        // We have no way of differenciating expressions from constants
        // => Just make some guesses and default to Sequelize.literal to pass the tests.
        const isString = this.type.startsWith('VARCHAR') || this.type === 'TEXT' || this.type === 'CHAR';
        let result;
        if (this.type.startsWith('ENUM')) {
            result = this.expression;
        }
        else if (isString) {
            result = this.literalUnlessMatch(/^[^()]+$/);
        }
        else if (this.type === 'JSON') {
            const match = this.expression.match(/^[_a-z0-9]+\\'(.+)\\'$/);
            if (match) {
                result = JSON.parse(match[1]);
            }
        }
        return result;
    }
    parsePostgres() {
        let result;
        if (/^'.*'::jsonb?$/i.test(this.expression)) {
            // Special case for json/jsonb
            const [, content] = this.expression.match(/^'(.*)'::jsonb?$/i);
            result = JSON.parse(content.replace(/''/g, "'"));
        }
        else if (/^'.*'::[a-z_ ]+$/i.test(this.expression)) {
            // Catches types containing only alpha and spaces (int, varchar, timestamp with timezone, ...)
            // This excludes arrays or other compound types (int[], ...).
            const [, content] = this.expression.match(/^'(.*)'::[a-z_ ]+$/i);
            result = content.replace(/''/g, "'");
        }
        return result;
    }
    parseMsSql() {
        // Remove wrapping parentheses
        while (/^\(.*\)$/.test(this.expression)) {
            this.expression = this.expression.substr(1, this.expression.length - 2);
        }
        if (this.type === 'BIT') {
            if (this.expression === '1')
                return true;
            if (this.expression === '0')
                return false;
        }
        return undefined;
    }
    literalUnlessMatch(regexp) {
        return regexp.test(this.expression) ? this.expression : Sequelize.literal(this.expression);
    }
}
module.exports = DefaultValueExpression;
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NBQUM7U0FDM0M7UUFFRCxPQUFPLFNBQVMsQ0FBQztJQUNuQixDQUFDO0lBRUQsa0JBQWtCLENBQUMsTUFBTTtRQUN2QixPQUFPLE1BQU0sQ0FBQyxJQUFJLENBQUMsSUFBSSxDQUFDLFVBQVUsQ0FBQyxDQUFDLENBQUMsQ0FBQyxJQUFJLENBQUMsVUFBVSxDQUFDLENBQUMsQ0FBQyxTQUFTLENBQUMsT0FBTyxDQUFDLElBQUksQ0FBQyxVQUFVLENBQUMsQ0FBQztJQUM3RixDQUFDO0NBQ0Y7QUFFRCxNQUFNLENBQUMsT0FBTyxHQUFHLHNCQUFzQixDQUFDIn0=