/
joinclause.js
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/
joinclause.js
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import { assign } from 'lodash';
import assert from 'assert';
// JoinClause
// -------
// The "JoinClause" is an object holding any necessary info about a join,
// including the type, and any associated tables & columns being joined.
function JoinClause(table, type, schema) {
this.schema = schema;
this.table = table;
this.joinType = type;
this.and = this;
this.clauses = [];
}
function getClauseFromArguments(compilerType, bool, first, operator, second) {
let data = null;
if (typeof first === 'function') {
data = {
type: 'onWrapped',
value: first,
bool: bool,
};
} else {
switch (arguments.length) {
case 3: {
data = { type: 'onRaw', value: first, bool };
break;
}
case 4:
data = {
type: compilerType,
column: first,
operator: '=',
value: operator,
bool,
};
break;
default:
data = {
type: compilerType,
column: first,
operator,
value: second,
bool,
};
}
}
return data;
}
assign(JoinClause.prototype, {
grouping: 'join',
// Adds an "on" clause to the current join object.
on(first) {
if (typeof first === 'object' && typeof first.toSQL !== 'function') {
const keys = Object.keys(first);
let i = -1;
const method = this._bool() === 'or' ? 'orOn' : 'on';
while (++i < keys.length) {
this[method](keys[i], first[keys[i]]);
}
return this;
}
const data = getClauseFromArguments('onBasic', this._bool(), ...arguments);
if (data) {
this.clauses.push(data);
}
return this;
},
// Adds a "using" clause to the current join.
using(column) {
return this.clauses.push({ type: 'onUsing', column, bool: this._bool() });
},
/*// Adds an "and on" clause to the current join object.
andOn() {
return this.on.apply(this, arguments);
},*/
// Adds an "or on" clause to the current join object.
orOn(first, operator, second) {
return this._bool('or').on.apply(this, arguments);
},
onVal(first) {
if (typeof first === 'object' && typeof first.toSQL !== 'function') {
const keys = Object.keys(first);
let i = -1;
const method = this._bool() === 'or' ? 'orOnVal' : 'onVal';
while (++i < keys.length) {
this[method](keys[i], first[keys[i]]);
}
return this;
}
const data = getClauseFromArguments('onVal', this._bool(), ...arguments);
if (data) {
this.clauses.push(data);
}
return this;
},
andOnVal() {
return this.onVal(...arguments);
},
orOnVal() {
return this._bool('or').onVal(...arguments);
},
onBetween(column, values) {
assert(
Array.isArray(values),
'The second argument to onBetween must be an array.'
);
assert(
values.length === 2,
'You must specify 2 values for the onBetween clause'
);
this.clauses.push({
type: 'onBetween',
column,
value: values,
bool: this._bool(),
not: this._not(),
});
return this;
},
onNotBetween(column, values) {
return this._not(true).onBetween(column, values);
},
orOnBetween(column, values) {
return this._bool('or').onBetween(column, values);
},
orOnNotBetween(column, values) {
return this._bool('or')
._not(true)
.onBetween(column, values);
},
onIn(column, values) {
if (Array.isArray(values) && values.length === 0) return this.on(1, '=', 0);
this.clauses.push({
type: 'onIn',
column,
value: values,
not: this._not(),
bool: this._bool(),
});
return this;
},
onNotIn(column, values) {
return this._not(true).onIn(column, values);
},
orOnIn(column, values) {
return this._bool('or').onIn(column, values);
},
orOnNotIn(column, values) {
return this._bool('or')
._not(true)
.onIn(column, values);
},
onNull(column) {
this.clauses.push({
type: 'onNull',
column,
not: this._not(),
bool: this._bool(),
});
return this;
},
orOnNull(callback) {
return this._bool('or').onNull(callback);
},
onNotNull(callback) {
return this._not(true).onNull(callback);
},
orOnNotNull(callback) {
return this._not(true)
._bool('or')
.onNull(callback);
},
onExists(callback) {
this.clauses.push({
type: 'onExists',
value: callback,
not: this._not(),
bool: this._bool(),
});
return this;
},
orOnExists(callback) {
return this._bool('or').onExists(callback);
},
onNotExists(callback) {
return this._not(true).onExists(callback);
},
orOnNotExists(callback) {
return this._not(true)
._bool('or')
.onExists(callback);
},
// Explicitly set the type of join, useful within a function when creating a grouped join.
type(type) {
this.joinType = type;
return this;
},
_bool(bool) {
if (arguments.length === 1) {
this._boolFlag = bool;
return this;
}
const ret = this._boolFlag || 'and';
this._boolFlag = 'and';
return ret;
},
_not(val) {
if (arguments.length === 1) {
this._notFlag = val;
return this;
}
const ret = this._notFlag;
this._notFlag = false;
return ret;
},
});
Object.defineProperty(JoinClause.prototype, 'or', {
get() {
return this._bool('or');
},
});
JoinClause.prototype.andOn = JoinClause.prototype.on;
JoinClause.prototype.andOnIn = JoinClause.prototype.onIn;
JoinClause.prototype.andOnNotIn = JoinClause.prototype.onNotIn;
JoinClause.prototype.andOnNull = JoinClause.prototype.onNull;
JoinClause.prototype.andOnNotNull = JoinClause.prototype.onNotNull;
JoinClause.prototype.andOnExists = JoinClause.prototype.onExists;
JoinClause.prototype.andOnNotExists = JoinClause.prototype.onNotExists;
JoinClause.prototype.andOnBetween = JoinClause.prototype.onBetween;
JoinClause.prototype.andOnNotBetween = JoinClause.prototype.onNotBetween;
export default JoinClause;