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node.go
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node.go
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/*
* Copyright 2022 The Gremlins 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.
*/
package engine
import (
"go/ast"
"go/token"
)
// NodeToken is the reference to the actualToken that will be mutated during
// the mutation testing.
type NodeToken struct {
tok *token.Token
TokPos token.Pos
node *ast.Node
}
type Node struct {
node *ast.Node
pos token.Pos
}
// NewTokenNode checks if the ast.Node implementation is supported by
// Gremlins and gets its Tok/Op and relative position.
// It returns false as second parameter if the implementation is not
// supported.
func NewTokenNode(n ast.Node) (*NodeToken, bool) {
var tok *token.Token
var pos token.Pos
node := &n
switch n := n.(type) {
case *ast.AssignStmt:
tok = &n.Tok
pos = n.TokPos
case *ast.BinaryExpr:
tok = &n.Op
pos = n.OpPos
case *ast.BranchStmt:
tok = &n.Tok
pos = n.TokPos
case *ast.IncDecStmt:
tok = &n.Tok
pos = n.TokPos
case *ast.UnaryExpr:
tok = &n.Op
pos = n.OpPos
default:
return &NodeToken{}, false
}
return &NodeToken{
tok: tok,
TokPos: pos,
node: node,
}, true
}
// Tok returns the reference to the token.Token.
func (n *NodeToken) Tok() token.Token {
return *n.tok
}
// SetTok sets the token.Token of the tokenNode.
func (n *NodeToken) SetTok(t token.Token) {
*n.tok = t
}
func NewNode(nd ast.Node) (*Node, bool) {
var pos token.Pos
var node *ast.Node
switch n := nd.(type) {
case *ast.BlockStmt, *ast.CaseClause:
node = &nd
pos = n.Pos()
default:
return &Node{}, false
}
return &Node{
node: node,
pos: pos,
}, true
}