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internal/core/adt: move decimal logic into one place
Or at least a start. This prepares for the new numbering system, where 1 and 1.0 can be used interchangeably. Change-Id: Ic311be58d59f75dc533b1bcda2ceb5bda7915056 Reviewed-on: https://cue-review.googlesource.com/c/cue/+/7881 Reviewed-by: CUE cueckoo <cueckoo@gmail.com> Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| // Copyright 2020 CUE Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
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| package adt | ||
|
|
||
| import ( | ||
| "math/big" | ||
|
|
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| "github.com/cockroachdb/apd/v2" | ||
| ) | ||
|
|
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| var apdCtx apd.Context | ||
|
|
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| func init() { | ||
| apdCtx = apd.BaseContext | ||
| apdCtx.Precision = 24 | ||
| } | ||
|
|
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| func (n *Num) Impl() *apd.Decimal { | ||
| return &n.X | ||
| } | ||
|
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| func (n *Num) Negative() bool { | ||
| return n.X.Negative | ||
| } | ||
|
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| func (a *Num) Cmp(b *Num) int { | ||
| return a.X.Cmp(&b.X) | ||
| } | ||
|
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| func (c *OpContext) Add(a, b *Num) Value { | ||
| return numOp(c, apdCtx.Add, a, b) | ||
| } | ||
|
|
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| func (c *OpContext) Sub(a, b *Num) Value { | ||
| return numOp(c, apdCtx.Sub, a, b) | ||
| } | ||
|
|
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| func (c *OpContext) Mul(a, b *Num) Value { | ||
| return numOp(c, apdCtx.Mul, a, b) | ||
| } | ||
|
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| func (c *OpContext) Quo(a, b *Num) Value { | ||
| v := numOp(c, apdCtx.Quo, a, b) | ||
| if n, ok := v.(*Num); ok { | ||
| n.K = FloatKind | ||
| } | ||
| return v | ||
| } | ||
|
|
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| func (c *OpContext) Pow(a, b *Num) Value { | ||
| return numOp(c, apdCtx.Pow, a, b) | ||
| } | ||
|
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| type numFunc func(z, x, y *apd.Decimal) (apd.Condition, error) | ||
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| func numOp(c *OpContext, fn numFunc, x, y *Num) Value { | ||
| var d apd.Decimal | ||
|
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| cond, err := fn(&d, &x.X, &y.X) | ||
|
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| if err != nil { | ||
| return c.NewErrf("failed arithmetic: %v", err) | ||
| } | ||
|
|
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| if cond.DivisionByZero() { | ||
| return c.NewErrf("division by zero") | ||
| } | ||
|
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| k := x.Kind() & y.Kind() | ||
| if k == 0 { | ||
| k = FloatKind | ||
| } | ||
| return c.newNum(&d, k) | ||
| } | ||
|
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| func (c *OpContext) IntDiv(a, b *Num) Value { | ||
| return intDivOp(c, (*big.Int).Div, a, b) | ||
| } | ||
|
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| func (c *OpContext) IntMod(a, b *Num) Value { | ||
| return intDivOp(c, (*big.Int).Mod, a, b) | ||
| } | ||
|
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| func (c *OpContext) IntQuo(a, b *Num) Value { | ||
| return intDivOp(c, (*big.Int).Quo, a, b) | ||
| } | ||
|
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| func (c *OpContext) IntRem(a, b *Num) Value { | ||
| return intDivOp(c, (*big.Int).Rem, a, b) | ||
| } | ||
|
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| type intFunc func(z, x, y *big.Int) *big.Int | ||
|
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| func intDivOp(c *OpContext, fn intFunc, a, b *Num) Value { | ||
| if b.X.IsZero() { | ||
| return c.NewErrf("division by zero") | ||
| } | ||
|
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| var x, y apd.Decimal | ||
| _, _ = apdCtx.RoundToIntegralValue(&x, &a.X) | ||
| if x.Negative { | ||
| x.Coeff.Neg(&x.Coeff) | ||
| } | ||
| _, _ = apdCtx.RoundToIntegralValue(&y, &b.X) | ||
| if y.Negative { | ||
| y.Coeff.Neg(&y.Coeff) | ||
| } | ||
|
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| var d apd.Decimal | ||
|
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| fn(&d.Coeff, &x.Coeff, &y.Coeff) | ||
|
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| if d.Coeff.Sign() < 0 { | ||
| d.Coeff.Neg(&d.Coeff) | ||
| d.Negative = true | ||
| } | ||
|
|
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| return c.newNum(&d, IntKind) | ||
| } |
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