90 lines
1.8 KiB
Go
90 lines
1.8 KiB
Go
/*
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Copyright 2021 The CloudEvents Authors
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SPDX-License-Identifier: Apache-2.0
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*/
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package expression
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import (
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cesql "github.com/cloudevents/sdk-go/sql/v2"
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"github.com/cloudevents/sdk-go/sql/v2/utils"
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cloudevents "github.com/cloudevents/sdk-go/v2"
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)
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type logicExpression struct {
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baseBinaryExpression
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fn func(x, y bool) bool
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verb string
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}
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func (s logicExpression) Evaluate(event cloudevents.Event) (interface{}, error) {
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leftVal, err := s.left.Evaluate(event)
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if err != nil {
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return false, err
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}
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leftVal, err = utils.Cast(leftVal, cesql.BooleanType)
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if err != nil {
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return false, err
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}
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// Don't bother to check the other expression unless we need to
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if s.verb == "AND" && leftVal.(bool) == false {
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return false, nil
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}
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if s.verb == "OR" && leftVal.(bool) == true {
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return true, nil
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}
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rightVal, err := s.right.Evaluate(event)
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if err != nil {
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return false, err
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}
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rightVal, err = utils.Cast(rightVal, cesql.BooleanType)
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if err != nil {
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return false, err
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}
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return s.fn(leftVal.(bool), rightVal.(bool)), nil
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}
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func NewAndExpression(left cesql.Expression, right cesql.Expression) cesql.Expression {
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return logicExpression{
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baseBinaryExpression: baseBinaryExpression{
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left: left,
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right: right,
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},
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fn: func(x, y bool) bool {
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return x && y
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},
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verb: "AND",
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}
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}
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func NewOrExpression(left cesql.Expression, right cesql.Expression) cesql.Expression {
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return logicExpression{
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baseBinaryExpression: baseBinaryExpression{
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left: left,
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right: right,
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},
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fn: func(x, y bool) bool {
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return x || y
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},
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verb: "OR",
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}
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}
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func NewXorExpression(left cesql.Expression, right cesql.Expression) cesql.Expression {
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return logicExpression{
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baseBinaryExpression: baseBinaryExpression{
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left: left,
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right: right,
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},
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fn: func(x, y bool) bool {
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return x != y
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},
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verb: "XOR",
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}
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}
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