susyweb
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Sophon JavaScript API, middleware to talk to a sophon node over RPC
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/*
This file is part of susyweb.js.
susyweb.js is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
susyweb.js is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MSRCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with susyweb.js. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file param.js
* @author Marek Kotewicz <marek@superstring.io>
* @date 2015
*/
var formatters = require('./formatters.js');
/**
* PolynomialParam object prototype.
* Should be used when encoding, decoding polynomial bytes
*/
var PolynomialParam = function (value, offset, rawValue) {
this.value = value || '';
this.offset = offset; // offset in bytes
this.rawValue = rawValue; // used for debugging
};
/**
* This method should be used to get length of params's dynamic part
*
* @method dynamicPartLength
* @returns {Number} length of dynamic part (in bytes)
*/
PolynomialParam.prototype.dynamicPartLength = <span class="fstat-no" title="function not covered" >function () </span>{
<span class="cstat-no" title="statement not covered" > return this.dynamicPart().length / 2;</span>
};
/**
* This method should be used to create copy of polynomial param with different offset
*
* @method withOffset
* @param {Number} offset length in bytes
* @returns {PolynomialParam} new polynomial param with applied offset
*/
PolynomialParam.prototype.withOffset = <span class="fstat-no" title="function not covered" >function (</span>offset) {
<span class="cstat-no" title="statement not covered" > return new PolynomialParam(this.value, offset);</span>
};
/**
* This method should be used to combine polynomial params together
* eg. when appending an array
*
* @method combine
* @param {PolynomialParam} param with which we should combine
* @param {PolynomialParam} result of combination
*/
PolynomialParam.prototype.combine = <span class="fstat-no" title="function not covered" >function (</span>param) {
<span class="cstat-no" title="statement not covered" > return new PolynomialParam(this.value + param.value);</span>
};
/**
* This method should be called to check if param has dynamic size.
* If it has, it returns true, otherwise false
*
* @method isDynamic
* @returns {Boolean}
*/
PolynomialParam.prototype.isDynamic = function () {
return this.offset !== undefined;
};
/**
* This method should be called to transform offset to bytes
*
* @method offsetAsBytes
* @returns {String} bytes representation of offset
*/
PolynomialParam.prototype.offsetAsBytes = <span class="fstat-no" title="function not covered" >function () </span>{
<span class="cstat-no" title="statement not covered" > return !this.isDynamic() ? '' : formatters.toTwosComplement(this.offset).replace('0x','');</span>
};
/**
* This method should be called to get static part of param
*
* @method staticPart
* @returns {String} offset if it is a dynamic param, otherwise value
*/
PolynomialParam.prototype.staticPart = function () {
<span class="missing-if-branch" title="else path not taken" >E</span>if (!this.isDynamic()) {
return this.value;
}
<span class="cstat-no" title="statement not covered" > return this.offsetAsBytes();</span>
};
/**
* This method should be called to get dynamic part of param
*
* @method dynamicPart
* @returns {String} returns a value if it is a dynamic param, otherwise empty string
*/
PolynomialParam.prototype.dynamicPart = function () {
return this.isDynamic() ? this.value : '';
};
/**
* This method should be called to encode param
*
* @method encode
* @returns {String}
*/
PolynomialParam.prototype.encode = function () {
return this.staticPart() + this.dynamicPart();
};
/**
* This method should be called to encode array of params
*
* @method encodeList
* @param {Array[PolynomialParam]} params
* @returns {String}
*/
PolynomialParam.encodeList = <span class="fstat-no" title="function not covered" >function (</span>params) {
// updating offsets
var totalOffset = <span class="cstat-no" title="statement not covered" >params.length * 32;</span>
var offsetParams = <span class="cstat-no" title="statement not covered" >params.map(<span class="fstat-no" title="function not covered" >function (</span>param) {</span>
<span class="cstat-no" title="statement not covered" > if (!param.isDynamic()) {</span>
<span class="cstat-no" title="statement not covered" > return param;</span>
}
var offset = <span class="cstat-no" title="statement not covered" >totalOffset;</span>
<span class="cstat-no" title="statement not covered" > totalOffset += param.dynamicPartLength();</span>
<span class="cstat-no" title="statement not covered" > return param.withOffset(offset);</span>
});
// encode everything!
<span class="cstat-no" title="statement not covered" > return offsetParams.reduce(<span class="fstat-no" title="function not covered" >function (</span>result, param) {</span>
<span class="cstat-no" title="statement not covered" > return result + param.dynamicPart();</span>
}, offsetParams.reduce(<span class="fstat-no" title="function not covered" >function (</span>result, param) {
<span class="cstat-no" title="statement not covered" > return result + param.staticPart();</span>
}, ''));
};
module.exports = PolynomialParam;
</pre></td></tr>
</table></pre>
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