mirror of
https://github.com/go-gitea/gitea
synced 2024-09-19 10:16:03 +00:00
565 lines
12 KiB
Go
565 lines
12 KiB
Go
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// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package evaluator
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import (
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"math"
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"github.com/juju/errors"
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"github.com/pingcap/tidb/ast"
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"github.com/pingcap/tidb/mysql"
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"github.com/pingcap/tidb/parser/opcode"
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"github.com/pingcap/tidb/util/types"
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)
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const (
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zeroI64 int64 = 0
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oneI64 int64 = 1
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)
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func (e *Evaluator) binaryOperation(o *ast.BinaryOperationExpr) bool {
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switch o.Op {
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case opcode.AndAnd, opcode.OrOr, opcode.LogicXor:
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return e.handleLogicOperation(o)
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case opcode.LT, opcode.LE, opcode.GE, opcode.GT, opcode.EQ, opcode.NE, opcode.NullEQ:
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return e.handleComparisonOp(o)
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case opcode.RightShift, opcode.LeftShift, opcode.And, opcode.Or, opcode.Xor:
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return e.handleBitOp(o)
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case opcode.Plus, opcode.Minus, opcode.Mod, opcode.Div, opcode.Mul, opcode.IntDiv:
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return e.handleArithmeticOp(o)
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default:
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e.err = ErrInvalidOperation
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return false
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}
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}
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func (e *Evaluator) handleLogicOperation(o *ast.BinaryOperationExpr) bool {
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switch o.Op {
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case opcode.AndAnd:
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return e.handleAndAnd(o)
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case opcode.OrOr:
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return e.handleOrOr(o)
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case opcode.LogicXor:
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return e.handleXor(o)
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default:
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e.err = ErrInvalidOperation.Gen("unkown operator %s", o.Op)
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return false
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}
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}
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func (e *Evaluator) handleAndAnd(o *ast.BinaryOperationExpr) bool {
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leftVal := o.L.GetValue()
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righVal := o.R.GetValue()
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if leftVal != nil {
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x, err := types.ToBool(leftVal)
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if err != nil {
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e.err = errors.Trace(err)
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return false
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} else if x == 0 {
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// false && any other types is false
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o.SetValue(x)
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return true
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}
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}
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if righVal != nil {
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y, err := types.ToBool(righVal)
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if err != nil {
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e.err = errors.Trace(err)
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return false
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} else if y == 0 {
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o.SetValue(y)
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return true
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}
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}
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if leftVal == nil || righVal == nil {
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o.SetValue(nil)
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return true
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}
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o.SetValue(int64(1))
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return true
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}
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func (e *Evaluator) handleOrOr(o *ast.BinaryOperationExpr) bool {
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leftVal := o.L.GetValue()
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righVal := o.R.GetValue()
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if leftVal != nil {
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x, err := types.ToBool(leftVal)
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if err != nil {
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e.err = errors.Trace(err)
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return false
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} else if x == 1 {
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// true || any other types is true.
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o.SetValue(x)
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return true
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}
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}
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if righVal != nil {
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y, err := types.ToBool(righVal)
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if err != nil {
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e.err = errors.Trace(err)
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return false
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} else if y == 1 {
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o.SetValue(y)
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return true
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}
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}
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if leftVal == nil || righVal == nil {
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o.SetValue(nil)
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return true
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}
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o.SetValue(int64(0))
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return true
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}
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func (e *Evaluator) handleXor(o *ast.BinaryOperationExpr) bool {
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leftVal := o.L.GetValue()
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righVal := o.R.GetValue()
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if leftVal == nil || righVal == nil {
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o.SetValue(nil)
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return true
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}
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x, err := types.ToBool(leftVal)
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if err != nil {
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e.err = errors.Trace(err)
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return false
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}
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y, err := types.ToBool(righVal)
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if err != nil {
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e.err = errors.Trace(err)
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return false
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}
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if x == y {
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o.SetValue(int64(0))
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} else {
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o.SetValue(int64(1))
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}
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return true
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}
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func (e *Evaluator) handleComparisonOp(o *ast.BinaryOperationExpr) bool {
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a, b := types.Coerce(o.L.GetValue(), o.R.GetValue())
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if a == nil || b == nil {
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// for <=>, if a and b are both nil, return true.
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// if a or b is nil, return false.
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if o.Op == opcode.NullEQ {
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if a == nil && b == nil {
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o.SetValue(oneI64)
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} else {
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o.SetValue(zeroI64)
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}
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} else {
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o.SetValue(nil)
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}
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return true
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}
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n, err := types.Compare(a, b)
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if err != nil {
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e.err = errors.Trace(err)
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return false
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}
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r, err := getCompResult(o.Op, n)
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if err != nil {
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e.err = errors.Trace(err)
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return false
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}
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if r {
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o.SetValue(oneI64)
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} else {
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o.SetValue(zeroI64)
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}
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return true
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}
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func getCompResult(op opcode.Op, value int) (bool, error) {
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switch op {
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case opcode.LT:
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return value < 0, nil
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case opcode.LE:
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return value <= 0, nil
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case opcode.GE:
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return value >= 0, nil
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case opcode.GT:
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return value > 0, nil
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case opcode.EQ:
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return value == 0, nil
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case opcode.NE:
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return value != 0, nil
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case opcode.NullEQ:
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return value == 0, nil
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default:
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return false, ErrInvalidOperation.Gen("invalid op %v in comparision operation", op)
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}
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}
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func (e *Evaluator) handleBitOp(o *ast.BinaryOperationExpr) bool {
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a, b := types.Coerce(o.L.GetValue(), o.R.GetValue())
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if a == nil || b == nil {
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o.SetValue(nil)
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return true
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}
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x, err := types.ToInt64(a)
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if err != nil {
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e.err = errors.Trace(err)
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return false
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}
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y, err := types.ToInt64(b)
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if err != nil {
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e.err = errors.Trace(err)
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return false
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}
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// use a int64 for bit operator, return uint64
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switch o.Op {
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case opcode.And:
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o.SetValue(uint64(x & y))
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case opcode.Or:
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o.SetValue(uint64(x | y))
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case opcode.Xor:
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o.SetValue(uint64(x ^ y))
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case opcode.RightShift:
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o.SetValue(uint64(x) >> uint64(y))
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case opcode.LeftShift:
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o.SetValue(uint64(x) << uint64(y))
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default:
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e.err = ErrInvalidOperation.Gen("invalid op %v in bit operation", o.Op)
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return false
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}
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return true
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}
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func (e *Evaluator) handleArithmeticOp(o *ast.BinaryOperationExpr) bool {
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a, err := coerceArithmetic(o.L.GetValue())
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if err != nil {
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e.err = errors.Trace(err)
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return false
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}
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b, err := coerceArithmetic(o.R.GetValue())
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if err != nil {
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e.err = errors.Trace(err)
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return false
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}
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a, b = types.Coerce(a, b)
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if a == nil || b == nil {
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o.SetValue(nil)
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return true
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}
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var result interface{}
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switch o.Op {
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case opcode.Plus:
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result, e.err = computePlus(a, b)
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case opcode.Minus:
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result, e.err = computeMinus(a, b)
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case opcode.Mul:
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result, e.err = computeMul(a, b)
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case opcode.Div:
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result, e.err = computeDiv(a, b)
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case opcode.Mod:
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result, e.err = computeMod(a, b)
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case opcode.IntDiv:
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result, e.err = computeIntDiv(a, b)
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default:
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e.err = ErrInvalidOperation.Gen("invalid op %v in arithmetic operation", o.Op)
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return false
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}
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o.SetValue(result)
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return e.err == nil
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}
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func computePlus(a, b interface{}) (interface{}, error) {
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switch x := a.(type) {
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case int64:
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switch y := b.(type) {
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case int64:
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return types.AddInt64(x, y)
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case uint64:
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return types.AddInteger(y, x)
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}
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case uint64:
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switch y := b.(type) {
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case int64:
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return types.AddInteger(x, y)
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case uint64:
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return types.AddUint64(x, y)
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}
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case float64:
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switch y := b.(type) {
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case float64:
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return x + y, nil
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}
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case mysql.Decimal:
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switch y := b.(type) {
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case mysql.Decimal:
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return x.Add(y), nil
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}
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}
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return types.InvOp2(a, b, opcode.Plus)
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}
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func computeMinus(a, b interface{}) (interface{}, error) {
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switch x := a.(type) {
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case int64:
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switch y := b.(type) {
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case int64:
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return types.SubInt64(x, y)
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case uint64:
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return types.SubIntWithUint(x, y)
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}
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case uint64:
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switch y := b.(type) {
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case int64:
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return types.SubUintWithInt(x, y)
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case uint64:
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return types.SubUint64(x, y)
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}
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case float64:
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switch y := b.(type) {
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case float64:
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return x - y, nil
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}
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case mysql.Decimal:
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switch y := b.(type) {
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case mysql.Decimal:
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return x.Sub(y), nil
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}
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}
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return types.InvOp2(a, b, opcode.Minus)
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}
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func computeMul(a, b interface{}) (interface{}, error) {
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switch x := a.(type) {
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case int64:
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switch y := b.(type) {
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case int64:
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return types.MulInt64(x, y)
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case uint64:
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return types.MulInteger(y, x)
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}
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case uint64:
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switch y := b.(type) {
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case int64:
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return types.MulInteger(x, y)
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case uint64:
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return types.MulUint64(x, y)
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}
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case float64:
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switch y := b.(type) {
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case float64:
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return x * y, nil
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}
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case mysql.Decimal:
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switch y := b.(type) {
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case mysql.Decimal:
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return x.Mul(y), nil
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}
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}
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return types.InvOp2(a, b, opcode.Mul)
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}
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func computeDiv(a, b interface{}) (interface{}, error) {
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// MySQL support integer divison Div and division operator /
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// we use opcode.Div for division operator and will use another for integer division later.
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// for division operator, we will use float64 for calculation.
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switch x := a.(type) {
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case float64:
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y, err := types.ToFloat64(b)
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if err != nil {
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return nil, errors.Trace(err)
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}
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if y == 0 {
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return nil, nil
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}
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return x / y, nil
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default:
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// the scale of the result is the scale of the first operand plus
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// the value of the div_precision_increment system variable (which is 4 by default)
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// we will use 4 here
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xa, err := types.ToDecimal(a)
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if err != nil {
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return nil, errors.Trace(err)
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}
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xb, err := types.ToDecimal(b)
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if err != nil {
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return nil, errors.Trace(err)
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}
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if f, _ := xb.Float64(); f == 0 {
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// division by zero return null
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return nil, nil
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}
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return xa.Div(xb), nil
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}
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}
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func computeMod(a, b interface{}) (interface{}, error) {
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switch x := a.(type) {
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case int64:
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switch y := b.(type) {
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case int64:
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if y == 0 {
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return nil, nil
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}
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return x % y, nil
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case uint64:
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if y == 0 {
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return nil, nil
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} else if x < 0 {
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// first is int64, return int64.
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return -int64(uint64(-x) % y), nil
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}
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return int64(uint64(x) % y), nil
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}
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case uint64:
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switch y := b.(type) {
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case int64:
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if y == 0 {
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return nil, nil
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} else if y < 0 {
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// first is uint64, return uint64.
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return uint64(x % uint64(-y)), nil
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}
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return x % uint64(y), nil
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case uint64:
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if y == 0 {
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return nil, nil
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}
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return x % y, nil
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}
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case float64:
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switch y := b.(type) {
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case float64:
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if y == 0 {
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return nil, nil
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}
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return math.Mod(x, y), nil
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}
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case mysql.Decimal:
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switch y := b.(type) {
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case mysql.Decimal:
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xf, _ := x.Float64()
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yf, _ := y.Float64()
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if yf == 0 {
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return nil, nil
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}
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||
|
return math.Mod(xf, yf), nil
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return types.InvOp2(a, b, opcode.Mod)
|
||
|
}
|
||
|
|
||
|
func computeIntDiv(a, b interface{}) (interface{}, error) {
|
||
|
switch x := a.(type) {
|
||
|
case int64:
|
||
|
switch y := b.(type) {
|
||
|
case int64:
|
||
|
if y == 0 {
|
||
|
return nil, nil
|
||
|
}
|
||
|
return types.DivInt64(x, y)
|
||
|
case uint64:
|
||
|
if y == 0 {
|
||
|
return nil, nil
|
||
|
}
|
||
|
return types.DivIntWithUint(x, y)
|
||
|
}
|
||
|
case uint64:
|
||
|
switch y := b.(type) {
|
||
|
case int64:
|
||
|
if y == 0 {
|
||
|
return nil, nil
|
||
|
}
|
||
|
return types.DivUintWithInt(x, y)
|
||
|
case uint64:
|
||
|
if y == 0 {
|
||
|
return nil, nil
|
||
|
}
|
||
|
return x / y, nil
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// if any is none integer, use decimal to calculate
|
||
|
x, err := types.ToDecimal(a)
|
||
|
if err != nil {
|
||
|
return nil, errors.Trace(err)
|
||
|
}
|
||
|
|
||
|
y, err := types.ToDecimal(b)
|
||
|
if err != nil {
|
||
|
return nil, errors.Trace(err)
|
||
|
}
|
||
|
|
||
|
if f, _ := y.Float64(); f == 0 {
|
||
|
return nil, nil
|
||
|
}
|
||
|
|
||
|
return x.Div(y).IntPart(), nil
|
||
|
}
|
||
|
|
||
|
func coerceArithmetic(a interface{}) (interface{}, error) {
|
||
|
switch x := a.(type) {
|
||
|
case string:
|
||
|
// MySQL will convert string to float for arithmetic operation
|
||
|
f, err := types.StrToFloat(x)
|
||
|
if err != nil {
|
||
|
return nil, errors.Trace(err)
|
||
|
}
|
||
|
return f, errors.Trace(err)
|
||
|
case mysql.Time:
|
||
|
// if time has no precision, return int64
|
||
|
v := x.ToNumber()
|
||
|
if x.Fsp == 0 {
|
||
|
return v.IntPart(), nil
|
||
|
}
|
||
|
return v, nil
|
||
|
case mysql.Duration:
|
||
|
// if duration has no precision, return int64
|
||
|
v := x.ToNumber()
|
||
|
if x.Fsp == 0 {
|
||
|
return v.IntPart(), nil
|
||
|
}
|
||
|
return v, nil
|
||
|
case []byte:
|
||
|
// []byte is the same as string, converted to float for arithmetic operator.
|
||
|
f, err := types.StrToFloat(string(x))
|
||
|
if err != nil {
|
||
|
return nil, errors.Trace(err)
|
||
|
}
|
||
|
return f, errors.Trace(err)
|
||
|
case mysql.Hex:
|
||
|
return x.ToNumber(), nil
|
||
|
case mysql.Bit:
|
||
|
return x.ToNumber(), nil
|
||
|
case mysql.Enum:
|
||
|
return x.ToNumber(), nil
|
||
|
case mysql.Set:
|
||
|
return x.ToNumber(), nil
|
||
|
default:
|
||
|
return x, nil
|
||
|
}
|
||
|
}
|