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errors.go
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errors.go
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// Copyright © 2018 Xavier Basty <xbasty@gmail.com>
//
// 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 vm
import (
"fmt"
)
// DivByZeroError is used to abort a thread when a division by zero occurs.
type DivByZeroError struct{}
func (DivByZeroError) Error() string {
return "divide by zero"
}
////////////////////////////////////////////////////////////////////////////////
// NilPointerError is used to abort a thread when a nil pointer is dereferenced.
type NilPointerError struct{}
func (NilPointerError) Error() string {
return "nil pointer dereference"
}
////////////////////////////////////////////////////////////////////////////////
// IndexError is used to abort a thread when an indexed expression is out of bounds.
type IndexError struct {
Idx, Len int64
}
func (e IndexError) Error() string {
if e.Idx < 0 {
return fmt.Sprintf("negative index: %d", e.Idx)
}
return fmt.Sprintf("index %d exceeds length %d", e.Idx, e.Len)
}
////////////////////////////////////////////////////////////////////////////////
// SliceError is used to abort a thread when invalid indices are used for
// a slice manipulation of a Slice, Array or String.
type SliceError struct {
Lo, Hi, Cap int64
}
func (e SliceError) Error() string {
return fmt.Sprintf("slice [%d:%d]; cap %d", e.Lo, e.Hi, e.Cap)
}
////////////////////////////////////////////////////////////////////////////////
// KeyError is used to abort a thread when invalid key indices are used in a map expression.
type KeyError struct {
Key interface{}
}
func (e KeyError) Error() string {
return fmt.Sprintf("key '%v' not found in map", e.Key)
}
////////////////////////////////////////////////////////////////////////////////
// NegativeLengthError is used to abort a thread when a negative length is used when creating a Slice.
type NegativeLengthError struct {
Len int64
}
func (e NegativeLengthError) Error() string {
return fmt.Sprintf("negative length: %d", e.Len)
}
////////////////////////////////////////////////////////////////////////////////
// NegativeCapacityError is used to abort a thread when a negative capacity is used when creating a Slice.
type NegativeCapacityError struct {
Len int64
}
func (e NegativeCapacityError) Error() string {
return fmt.Sprintf("negative capacity: %d", e.Len)
}