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expr.go
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expr.go
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/*
* Copyright 2019-2020 by Nedim Sabic Sabic
* https://www.fibratus.io
* All Rights Reserved.
*
* 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.
*/
package ql
import "fmt"
// Node represents a node in the abstract syntax tree.
type Node interface {
String() string
}
// Expr represents an expression that can be evaluated to a value.
type Expr interface {
Node
}
// ParenExpr represents a parenthesized expression.
type ParenExpr struct {
Expr Expr
}
// String returns a string representation of the parenthesized expression.
func (e *ParenExpr) String() string { return fmt.Sprintf("(%s)", e.Expr.String()) }
// BinaryExpr represents an operation between two expressions.
type BinaryExpr struct {
Op token
LHS Expr
RHS Expr
}
// String returns a string representation of the binary expression.
func (e *BinaryExpr) String() string {
return fmt.Sprintf("%s %s %s", e.LHS.String(), e.Op.String(), e.RHS.String())
}
// NotExpr represents an unary not expression.
type NotExpr struct {
Expr Expr
}
// String returns a string representation of the not expression.
func (e *NotExpr) String() string { return fmt.Sprintf("(%s)", e.Expr.String()) }