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EqOperator.ts
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EqOperator.ts
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// Copyright 2015-2019 SWIM.AI inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import {Murmur3, Objects} from "@swim/util";
import {Output} from "@swim/codec";
import {Item} from "../Item";
import {BinaryOperator} from "./BinaryOperator";
import {AnyInterpreter, Interpreter} from "../Interpreter";
export class EqOperator extends BinaryOperator {
constructor(operand1: Item, operand2: Item) {
super(operand1, operand2);
}
operator(): string {
return "==";
}
precedence(): number {
return 0;
}
evaluate(interpreter: AnyInterpreter): Item {
interpreter = Interpreter.fromAny(interpreter);
interpreter.willOperate(this);
const argument1 = this._operand1.evaluate(interpreter);
const argument2 = this._operand2.evaluate(interpreter);
const result = argument1.eq(argument2);
interpreter.didOperate(this, result);
return result;
}
substitute(interpreter: AnyInterpreter): Item {
interpreter = Interpreter.fromAny(interpreter);
const argument1 = this._operand1.substitute(interpreter);
const argument2 = this._operand2.substitute(interpreter);
return argument1.eq(argument2);
}
typeOrder(): number {
return 28;
}
compareTo(that: Item): 0 | 1 | -1 {
if (that instanceof EqOperator) {
let order = this._operand1.compareTo(that._operand1);
if (order === 0) {
order = this._operand2.compareTo(that._operand2);
}
return order;
}
return Objects.compare(this.typeOrder(), that.typeOrder());
}
equals(that: unknown): boolean {
if (this === that) {
return true;
} else if (that instanceof EqOperator) {
return this._operand1.equals(that._operand1) && this._operand2.equals(that._operand2);
}
return false;
}
hashCode(): number {
if (EqOperator._hashSeed === void 0) {
EqOperator._hashSeed = Murmur3.seed(EqOperator);
}
return Murmur3.mash(Murmur3.mix(Murmur3.mix(EqOperator._hashSeed,
this._operand1.hashCode()), this._operand2.hashCode()));
}
debug(output: Output): void {
output.debug(this._operand1).write(46/*'.'*/).write("eq").write(40/*'('*/)
.debug(this._operand2).write(41/*')'*/);
}
clone(): EqOperator {
return new EqOperator(this._operand1.clone(), this._operand2.clone());
}
private static _hashSeed?: number;
}
Item.EqOperator = EqOperator;