117 lines
3.2 KiB
Haxe
117 lines
3.2 KiB
Haxe
/*
|
|
* Copyright (C)2005-2019 Haxe Foundation
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
* DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
package haxe;
|
|
|
|
using haxe.Int64;
|
|
|
|
import StringTools;
|
|
|
|
/**
|
|
Helper for parsing to `Int64` instances.
|
|
**/
|
|
class Int64Helper {
|
|
/**
|
|
Create `Int64` from given string.
|
|
**/
|
|
public static function parseString(sParam:String):Int64 {
|
|
var base = Int64.ofInt(10);
|
|
var current = Int64.ofInt(0);
|
|
var multiplier = Int64.ofInt(1);
|
|
var sIsNegative = false;
|
|
|
|
var s = StringTools.trim(sParam);
|
|
if (s.charAt(0) == "-") {
|
|
sIsNegative = true;
|
|
s = s.substring(1, s.length);
|
|
}
|
|
var len = s.length;
|
|
|
|
for (i in 0...len) {
|
|
var digitInt = s.charCodeAt(len - 1 - i) - '0'.code;
|
|
|
|
if (digitInt < 0 || digitInt > 9) {
|
|
throw "NumberFormatError";
|
|
}
|
|
|
|
if (digitInt != 0) {
|
|
var digit:Int64 = Int64.ofInt(digitInt);
|
|
if (sIsNegative) {
|
|
current = Int64.sub(current, Int64.mul(multiplier, digit));
|
|
if (!Int64.isNeg(current)) {
|
|
throw "NumberFormatError: Underflow";
|
|
}
|
|
} else {
|
|
current = Int64.add(current, Int64.mul(multiplier, digit));
|
|
if (Int64.isNeg(current)) {
|
|
throw "NumberFormatError: Overflow";
|
|
}
|
|
}
|
|
}
|
|
|
|
multiplier = Int64.mul(multiplier, base);
|
|
}
|
|
return current;
|
|
}
|
|
|
|
/**
|
|
Create `Int64` from given float.
|
|
**/
|
|
public static function fromFloat(f:Float):Int64 {
|
|
if (Math.isNaN(f) || !Math.isFinite(f)) {
|
|
throw "Number is NaN or Infinite";
|
|
}
|
|
|
|
var noFractions = f - (f % 1);
|
|
|
|
// 2^53-1 and -2^53+1: these are parseable without loss of precision.
|
|
// In theory 2^53 and -2^53 are parseable too, but then there's no way to
|
|
// distinguish 2^53 from 2^53+1
|
|
// (i.e. trace(9007199254740992. + 1. > 9007199254740992.); // false!)
|
|
if (noFractions > 9007199254740991) {
|
|
throw "Conversion overflow";
|
|
}
|
|
if (noFractions < -9007199254740991) {
|
|
throw "Conversion underflow";
|
|
}
|
|
|
|
var result = Int64.ofInt(0);
|
|
var neg = noFractions < 0;
|
|
var rest = neg ? -noFractions : noFractions;
|
|
|
|
var i = 0;
|
|
while (rest >= 1) {
|
|
var curr = rest % 2;
|
|
rest = rest / 2;
|
|
if (curr >= 1) {
|
|
result = Int64.add(result, Int64.shl(Int64.ofInt(1), i));
|
|
}
|
|
i++;
|
|
}
|
|
|
|
if (neg) {
|
|
result = Int64.neg(result);
|
|
}
|
|
return result;
|
|
}
|
|
}
|