Do not perform not meaningful operations on ImpreciseFraction

src/main/kotlin/ru/dbotthepony/mc/otm/core/ImpreciseFraction.kt

@@ -129,6 +129,8 @@ private const val MEANINGFUL_BITS_DOUBLE = MEANINGFUL_BITS_LONG.toDouble()
 private val MEANINGFUL_BITS_CONTEXT = MathContext(MEANINGFUL_BITS)
 private val MEANINGFUL_BITS_BI = BigInteger.valueOf(MEANINGFUL_BITS_LONG)
 
+private val BI_MINUS_ONE = -BigInteger.ONE
+
 /**
  * Imprecise Fraction class for dealing with huge numbers that need fractional part to some extent.
  *
@@ -312,30 +314,205 @@ class ImpreciseFraction @JvmOverloads constructor(whole: BigInteger, decimal: Do
 		return ImpreciseFraction(div[0].toBigInteger(), div[1].toDouble() / bD)
 	}
 
-	operator fun plus(other: 	Float): ImpreciseFraction = plus(ImpreciseFraction(other))
-	operator fun minus(other: 	Float): ImpreciseFraction = minus(ImpreciseFraction(other))
-	operator fun times(other: 	Float): ImpreciseFraction = times(ImpreciseFraction(other))
-	operator fun div(other: 	Float): ImpreciseFraction = div(ImpreciseFraction(other))
+	operator fun plus(other: Float): ImpreciseFraction {
+		if (other == 0f) {
+			return this
+		}
 
-	operator fun plus(other: 	Double): ImpreciseFraction = plus(ImpreciseFraction(other))
-	operator fun minus(other: 	Double): ImpreciseFraction = minus(ImpreciseFraction(other))
-	operator fun times(other: 	Double): ImpreciseFraction = times(ImpreciseFraction(other))
-	operator fun div(other: 	Double): ImpreciseFraction = div(ImpreciseFraction(other))
+		return plus(ImpreciseFraction(other))
+	}
 
-	operator fun plus(other: 	Int): ImpreciseFraction = plus(ImpreciseFraction(other))
-	operator fun minus(other: 	Int): ImpreciseFraction = minus(ImpreciseFraction(other))
-	operator fun times(other: 	Int): ImpreciseFraction = times(ImpreciseFraction(other))
-	operator fun div(other: 	Int): ImpreciseFraction = div(ImpreciseFraction(other))
+	operator fun minus(other: Float): ImpreciseFraction {
+		if (other == 0f) {
+			return this
+		}
 
-	operator fun plus(other: 	Long): ImpreciseFraction = plus(ImpreciseFraction(other))
-	operator fun minus(other: 	Long): ImpreciseFraction = minus(ImpreciseFraction(other))
-	operator fun times(other: 	Long): ImpreciseFraction = times(ImpreciseFraction(other))
-	operator fun div(other: 	Long): ImpreciseFraction = div(ImpreciseFraction(other))
+		return minus(ImpreciseFraction(other))
+	}
 
-	operator fun plus(other: 	BigInteger): ImpreciseFraction = plus(ImpreciseFraction(other))
-	operator fun minus(other: 	BigInteger): ImpreciseFraction = minus(ImpreciseFraction(other))
-	operator fun times(other: 	BigInteger): ImpreciseFraction = times(ImpreciseFraction(other))
-	operator fun div(other: 	BigInteger): ImpreciseFraction = div(ImpreciseFraction(other))
+	operator fun times(other: Float): ImpreciseFraction {
+		if (other == 1f) {
+			return this
+		} else if (other == 0f) {
+			return ZERO
+		} else if (other == -1f) {
+			return -this
+		}
+
+		return times(ImpreciseFraction(other))
+	}
+
+	operator fun div(other: Float): ImpreciseFraction {
+		if (other == 0f) {
+			return NaN
+		} else if (other == 1f) {
+			return this
+		} else if (other == -1f) {
+			return -this
+		}
+
+		return div(ImpreciseFraction(other))
+	}
+
+	operator fun plus(other: Double): ImpreciseFraction {
+		if (other == 0.0) {
+			return this
+		}
+
+		return plus(ImpreciseFraction(other))
+	}
+
+	operator fun minus(other: Double): ImpreciseFraction {
+		if (other == 0.0) {
+			return this
+		}
+
+		return minus(ImpreciseFraction(other))
+	}
+
+	operator fun times(other: Double): ImpreciseFraction {
+		if (other == 1.0) {
+			return this
+		} else if (other == 0.0) {
+			return ZERO
+		} else if (other == -1.0) {
+			return -this
+		}
+
+		return times(ImpreciseFraction(other))
+	}
+
+	operator fun div(other: Double): ImpreciseFraction {
+		if (other == 0.0) {
+			return NaN
+		} else if (other == 1.0) {
+			return this
+		} else if (other == -1.0) {
+			return -this
+		}
+
+		return div(ImpreciseFraction(other))
+	}
+
+	operator fun plus(other: Int): ImpreciseFraction {
+		if (other == 0) {
+			return this
+		}
+
+		return plus(ImpreciseFraction(other))
+	}
+
+	operator fun minus(other: Int): ImpreciseFraction {
+		if (other == 0) {
+			return this
+		}
+
+		return minus(ImpreciseFraction(other))
+	}
+
+	operator fun times(other: Int): ImpreciseFraction {
+		if (other == 1) {
+			return this
+		} else if (other == 0) {
+			return ZERO
+		} else if (other == -1) {
+			return -this
+		}
+
+		return times(ImpreciseFraction(other))
+	}
+
+	operator fun div(other: Int): ImpreciseFraction {
+		if (other == 0) {
+			return NaN
+		} else if (other == 1) {
+			return this
+		} else if (other == -1) {
+			return -this
+		}
+
+		return div(ImpreciseFraction(other))
+	}
+
+	operator fun plus(other: Long): ImpreciseFraction {
+		if (other == 0L) {
+			return this
+		}
+
+		return plus(ImpreciseFraction(other))
+	}
+
+	operator fun minus(other: Long): ImpreciseFraction {
+		if (other == 0L) {
+			return this
+		}
+
+		return minus(ImpreciseFraction(other))
+	}
+
+	operator fun times(other: Long): ImpreciseFraction {
+		if (other == 1L) {
+			return this
+		} else if (other == 0L) {
+			return ZERO
+		} else if (other == -1L) {
+			return -this
+		}
+
+		return times(ImpreciseFraction(other))
+	}
+
+	operator fun div(other: Long): ImpreciseFraction {
+		if (other == 0L) {
+			return NaN
+		} else if (other == 1L) {
+			return this
+		} else if (other == -1L) {
+			return -this
+		}
+
+		return div(ImpreciseFraction(other))
+	}
+
+	operator fun plus(other: BigInteger): ImpreciseFraction {
+		if (other == BigInteger.ZERO) {
+			return this
+		}
+
+		return plus(ImpreciseFraction(other))
+	}
+
+	operator fun minus(other: BigInteger): ImpreciseFraction {
+		if (other == BigInteger.ZERO) {
+			return this
+		}
+
+		return minus(ImpreciseFraction(other))
+	}
+
+	operator fun times(other: BigInteger): ImpreciseFraction {
+		if (other == BigInteger.ONE) {
+			return this
+		} else if (other == BigInteger.ZERO) {
+			return ZERO
+		} else if (other == BI_MINUS_ONE) {
+			return -this
+		}
+
+		return times(ImpreciseFraction(other))
+	}
+
+	operator fun div(other: BigInteger): ImpreciseFraction {
+		if (other == BigInteger.ZERO) {
+			return NaN
+		} else if (other == BigInteger.ONE) {
+			return this
+		} else if (other == BI_MINUS_ONE) {
+			return -this
+		}
+
+		return div(ImpreciseFraction(other))
+	}
 
 	operator fun unaryMinus(): ImpreciseFraction {
 		return ImpreciseFraction(-whole, -decimal)