/
columncompiler.js
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/
columncompiler.js
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// Column Compiler
// Used for designating column definitions
// during the table "create" / "alter" statements.
// -------
const Raw = require('../raw');
const helpers = require('./helpers');
const { groupBy, first, tail, has, isObject } = require('lodash');
function ColumnCompiler(client, tableCompiler, columnBuilder) {
this.client = client;
this.tableCompiler = tableCompiler;
this.columnBuilder = columnBuilder;
this._commonBuilder = this.columnBuilder;
this.args = columnBuilder._args;
this.type = columnBuilder._type.toLowerCase();
this.grouped = groupBy(columnBuilder._statements, 'grouping');
this.modified = columnBuilder._modifiers;
this.isIncrements = this.type.indexOf('increments') !== -1;
this.formatter = client.formatter(columnBuilder);
this.sequence = [];
this.modifiers = [];
}
ColumnCompiler.prototype.pushQuery = helpers.pushQuery;
ColumnCompiler.prototype.pushAdditional = helpers.pushAdditional;
ColumnCompiler.prototype.unshiftQuery = helpers.unshiftQuery;
ColumnCompiler.prototype._defaultMap = {
columnName: function() {
if (!this.isIncrements) {
throw new Error(
`You did not specify a column name for the ${this.type} column.`
);
}
return 'id';
},
};
ColumnCompiler.prototype.defaults = function(label) {
if (Object.prototype.hasOwnProperty.call(this._defaultMap, label)) {
return this._defaultMap[label].bind(this)();
} else {
throw new Error(
`There is no default for the specified identifier ${label}`
);
}
};
// To convert to sql, we first go through and build the
// column as it would be in the insert statement
ColumnCompiler.prototype.toSQL = function() {
this.pushQuery(this.compileColumn());
if (this.sequence.additional) {
this.sequence = this.sequence.concat(this.sequence.additional);
}
return this.sequence;
};
// Compiles a column.
ColumnCompiler.prototype.compileColumn = function() {
return (
this.formatter.wrap(this.getColumnName()) +
' ' +
this.getColumnType() +
this.getModifiers()
);
};
// Assumes the autoincrementing key is named `id` if not otherwise specified.
ColumnCompiler.prototype.getColumnName = function() {
const value = first(this.args);
return value || this.defaults('columnName');
};
ColumnCompiler.prototype.getColumnType = function() {
const type = this[this.type];
return typeof type === 'function' ? type.apply(this, tail(this.args)) : type;
};
ColumnCompiler.prototype.getModifiers = function() {
const modifiers = [];
for (let i = 0, l = this.modifiers.length; i < l; i++) {
const modifier = this.modifiers[i];
//Cannot allow 'nullable' modifiers on increments types
if (!this.isIncrements || (this.isIncrements && modifier === 'comment')) {
if (has(this.modified, modifier)) {
const val = this[modifier].apply(this, this.modified[modifier]);
if (val) modifiers.push(val);
}
}
}
return modifiers.length > 0 ? ` ${modifiers.join(' ')}` : '';
};
// Types
// ------
ColumnCompiler.prototype.increments =
'integer not null primary key autoincrement';
ColumnCompiler.prototype.bigincrements =
'integer not null primary key autoincrement';
ColumnCompiler.prototype.integer = ColumnCompiler.prototype.smallint = ColumnCompiler.prototype.mediumint =
'integer';
ColumnCompiler.prototype.biginteger = 'bigint';
ColumnCompiler.prototype.varchar = function(length) {
return `varchar(${this._num(length, 255)})`;
};
ColumnCompiler.prototype.text = 'text';
ColumnCompiler.prototype.tinyint = 'tinyint';
ColumnCompiler.prototype.floating = function(precision, scale) {
return `float(${this._num(precision, 8)}, ${this._num(scale, 2)})`;
};
ColumnCompiler.prototype.decimal = function(precision, scale) {
if (precision === null) {
throw new Error(
'Specifying no precision on decimal columns is not supported for that SQL dialect.'
);
}
return `decimal(${this._num(precision, 8)}, ${this._num(scale, 2)})`;
};
ColumnCompiler.prototype.binary = 'blob';
ColumnCompiler.prototype.bool = 'boolean';
ColumnCompiler.prototype.date = 'date';
ColumnCompiler.prototype.datetime = 'datetime';
ColumnCompiler.prototype.time = 'time';
ColumnCompiler.prototype.timestamp = 'timestamp';
ColumnCompiler.prototype.enu = 'varchar';
ColumnCompiler.prototype.bit = ColumnCompiler.prototype.json = 'text';
ColumnCompiler.prototype.uuid = 'char(36)';
ColumnCompiler.prototype.specifictype = (type) => type;
// Modifiers
// -------
ColumnCompiler.prototype.nullable = (nullable) =>
nullable === false ? 'not null' : 'null';
ColumnCompiler.prototype.notNullable = function() {
return this.nullable(false);
};
ColumnCompiler.prototype.defaultTo = function(value) {
if (value === void 0) {
return '';
} else if (value === null) {
value = 'null';
} else if (value instanceof Raw) {
value = value.toQuery();
} else if (this.type === 'bool') {
if (value === 'false') value = 0;
value = `'${value ? 1 : 0}'`;
} else if (
(this.type === 'json' || this.type === 'jsonb') &&
isObject(value)
) {
value = `'${JSON.stringify(value)}'`;
} else {
value = `'${value}'`;
}
return `default ${value}`;
};
ColumnCompiler.prototype._num = function(val, fallback) {
if (val === undefined || val === null) return fallback;
const number = parseInt(val, 10);
return isNaN(number) ? fallback : number;
};
module.exports = ColumnCompiler;