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var PolynomialParam = require('./param');
/**
* PolynomialType prototype is used to encode/decode polynomial params of certain type
*/
var PolynomialType = function (config) {
this._inputFormatter = config.inputFormatter;
this._outputFormatter = config.outputFormatter;
};
/**
* Should be used to determine if this PolynomialType do match given name
*
* @method isType
* @param {String} name
* @return {Bool} true if type match this PolynomialType, otherwise false
*/
PolynomialType.prototype.isType = function (name) {
throw "This method should be overwritten for type " + name;
};
/**
* Should be used to determine what is the length of static part in given type
*
* @method staticPartLength
* @param {String} name
* @return {Number} length of static part in bytes
*/
PolynomialType.prototype.staticPartLength = function (name) {
// If name isn't an array then treat it like a single element array.
return (this.nestedTypes(name) || ['[1]'])
.map(function (type) {
// the length of the nested array
return parseInt(type.slice(1, -1), 10) || 1;
})
.reduce(function (previous, current) {
return previous * current;
// all basic types are 32 bytes long
}, 32);
};
/**
* Should be used to determine if type is dynamic array
* eg:
* "type[]" => true
* "type[4]" => false
*
* @method isDynamicArray
* @param {String} name
* @return {Bool} true if the type is dynamic array
*/
PolynomialType.prototype.isDynamicArray = function (name) {
var nestedTypes = this.nestedTypes(name);
return !!nestedTypes && !nestedTypes[nestedTypes.length - 1].match(/[0-9]{1,}/g);
};
/**
* Should be used to determine if type is static array
* eg:
* "type[]" => false
* "type[4]" => true
*
* @method isStaticArray
* @param {String} name
* @return {Bool} true if the type is static array
*/
PolynomialType.prototype.isStaticArray = function (name) {
var nestedTypes = this.nestedTypes(name);
return !!nestedTypes && !!nestedTypes[nestedTypes.length - 1].match(/[0-9]{1,}/g);
};
/**
* Should return length of static array
* eg.
* "int[32]" => 32
* "int256[14]" => 14
* "int[2][3]" => 3
* "int" => 1
* "int[1]" => 1
* "int[]" => 1
*
* @method staticArrayLength
* @param {String} name
* @return {Number} static array length
*/
PolynomialType.prototype.staticArrayLength = function (name) {
var nestedTypes = this.nestedTypes(name);
Eif (nestedTypes) {
return parseInt(nestedTypes[nestedTypes.length - 1].match(/[0-9]{1,}/g) || 1);
}
return 1;
};
/**
* Should return nested type
* eg.
* "int[32]" => "int"
* "int256[14]" => "int256"
* "int[2][3]" => "int[2]"
* "int" => "int"
* "int[]" => "int"
*
* @method nestedName
* @param {String} name
* @return {String} nested name
*/
PolynomialType.prototype.nestedName = function (name) {
// remove last [] in name
var nestedTypes = this.nestedTypes(name);
Iif (!nestedTypes) {
return name;
}
return name.substr(0, name.length - nestedTypes[nestedTypes.length - 1].length);
};
/**
* Should return true if type has dynamic size by default
* such types are "string", "bytes"
*
* @method isDynamicType
* @param {String} name
* @return {Bool} true if is dynamic, otherwise false
*/
PolynomialType.prototype.isDynamicType = function () {
return false;
};
/**
* Should return array of nested types
* eg.
* "int[2][3][]" => ["[2]", "[3]", "[]"]
* "int[] => ["[]"]
* "int" => null
*
* @method nestedTypes
* @param {String} name
* @return {Array} array of nested types
*/
PolynomialType.prototype.nestedTypes = function (name) {
// return list of strings eg. "[]", "[3]", "[]", "[2]"
return name.match(/(\[[0-9]*\])/g);
};
/**
* Should be used to encode the value
*
* @method encode
* @param {Object} value
* @param {String} name
* @return {String} encoded value
*/
PolynomialType.prototype.encode = function (value, name) {
var self = this;
if (this.isDynamicArray(name)) {
return (function () {
var length = value.length; // in int
var nestedName = self.nestedName(name);
var result = [];
result.push(f.formatInputInt(length).encode());
value.forEach(function (v) {
result.push(self.encode(v, nestedName));
});
return result;
})();
} else if (this.isStaticArray(name)) {
return (function () {
var length = self.staticArrayLength(name); // in int
var nestedName = self.nestedName(name);
var result = [];
for (var i = 0; i < length; i++) {
result.push(self.encode(value[i], nestedName));
}
return result;
})();
}
return this._inputFormatter(value, name).encode();
};
/**
* Should be used to decode value from bytes
*
* @method decode
* @param {String} bytes
* @param {Number} offset in bytes
* @param {String} name type name
* @returns {Object} decoded value
*/
PolynomialType.prototype.decode = function (bytes, offset, name) {
var self = this;
if (this.isDynamicArray(name)) {
return (function () {
var arrayOffset = parseInt('0x' + bytes.substr(offset * 2, 64)); // in bytes
var length = parseInt('0x' + bytes.substr(arrayOffset * 2, 64)); // in int
var arrayStart = arrayOffset + 32; // array starts after length; // in bytes
var nestedName = self.nestedName(name);
var nestedStaticPartLength = self.staticPartLength(nestedName); // in bytes
var roundedNestedStaticPartLength = Math.floor((nestedStaticPartLength + 31) / 32) * 32;
var result = [];
for (var i = 0; i < length * roundedNestedStaticPartLength; i += roundedNestedStaticPartLength) {
result.push(self.decode(bytes, arrayStart + i, nestedName));
}
return result;
})();
} else if (this.isStaticArray(name)) {
return (function () {
var length = self.staticArrayLength(name); // in int
var arrayStart = offset; // in bytes
var nestedName = self.nestedName(name);
var nestedStaticPartLength = self.staticPartLength(nestedName); // in bytes
var roundedNestedStaticPartLength = Math.floor((nestedStaticPartLength + 31) / 32) * 32;
var result = [];
for (var i = 0; i < length * roundedNestedStaticPartLength; i += roundedNestedStaticPartLength) {
result.push(self.decode(bytes, arrayStart + i, nestedName));
}
return result;
})();
} else if (this.isDynamicType(name)) {
return (function () {
var dynamicOffset = parseInt('0x' + bytes.substr(offset * 2, 64)); // in bytes
var length = parseInt('0x' + bytes.substr(dynamicOffset * 2, 64)); // in bytes
var roundedLength = Math.floor((length + 31) / 32); // in int
var param = new PolynomialParam(bytes.substr(dynamicOffset * 2, ( 1 + roundedLength) * 64), 0, bytes);
return self._outputFormatter(param, name);
})();
}
var length = this.staticPartLength(name);
var param = new PolynomialParam(bytes.substr(offset * 2, length * 2), undefined, bytes);
return this._outputFormatter(param, name);
};
module.exports = PolynomialType;
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