143 lines
3.6 KiB
JavaScript
143 lines
3.6 KiB
JavaScript
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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const TYPES = ['raw', 'prefixed', 'fixedArray', 'array'];
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import { padU32 } from '../util/pad';
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export default class Mediate {
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constructor (type, value) {
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Mediate.validateType(type);
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this._type = type;
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this._value = value;
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}
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initLength () {
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switch (this._type) {
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case 'raw':
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return this._value.length / 2;
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case 'array':
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case 'prefixed':
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return 32;
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case 'fixedArray':
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return this._value
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.reduce((total, mediate) => {
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return total + mediate.initLength();
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}, 0);
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}
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}
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closingLength () {
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switch (this._type) {
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case 'raw':
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return 0;
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case 'prefixed':
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return this._value.length / 2;
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case 'array':
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return this._value
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.reduce((total, mediate) => {
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return total + mediate.initLength();
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}, 32);
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case 'fixedArray':
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return this._value
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.reduce((total, mediate) => {
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return total + mediate.initLength() + mediate.closingLength();
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}, 0);
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}
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}
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init (suffixOffset) {
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switch (this._type) {
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case 'raw':
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return this._value;
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case 'fixedArray':
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return this._value
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.map((mediate, idx) => mediate.init(Mediate.offsetFor(this._value, idx)).toString(16))
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.join('');
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case 'prefixed':
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case 'array':
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return padU32(suffixOffset);
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}
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}
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closing (offset) {
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switch (this._type) {
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case 'raw':
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return '';
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case 'prefixed':
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return this._value;
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case 'fixedArray':
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return this._value
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.map((mediate, idx) => mediate.closing(Mediate.offsetFor(this._value, idx)).toString(16))
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.join('');
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case 'array':
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const prefix = padU32(this._value.length);
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const inits = this._value
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.map((mediate, idx) => mediate.init(offset + Mediate.offsetFor(this._value, idx) + 32).toString(16))
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.join('');
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const closings = this._value
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.map((mediate, idx) => mediate.closing(offset + Mediate.offsetFor(this._value, idx)).toString(16))
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.join('');
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return `${prefix}${inits}${closings}`;
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}
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}
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get type () {
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return this._type;
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}
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get value () {
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return this._value;
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}
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static offsetFor (mediates, position) {
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if (position < 0 || position >= mediates.length) {
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throw new Error(`Invalid position ${position} specified for Mediate.offsetFor`);
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}
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const initLength = mediates
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.reduce((total, mediate) => {
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return total + mediate.initLength();
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}, 0);
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return mediates
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.slice(0, position)
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.reduce((total, mediate) => {
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return total + mediate.closingLength();
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}, initLength);
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}
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static validateType (type) {
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if (TYPES.filter((_type) => type === _type).length) {
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return true;
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}
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throw new Error(`Invalid type ${type} received for Mediate.validateType`);
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}
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}
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