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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package eval
import (
"fmt"
"os"
"runtime"
)
// Abort aborts the thread's current computation,
// causing the innermost Try to return err.
func (t *Thread) Abort(err os.Error) {
if t.abort == nil {
panic("abort: " + err.String())
}
t.abort <- err
runtime.Goexit()
}
// Try executes a computation; if the computation
// Aborts, Try returns the error passed to abort.
func (t *Thread) Try(f func(t *Thread)) os.Error {
oc := t.abort
c := make(chan os.Error)
t.abort = c
go func() {
f(t)
c <- nil
}()
err := <-c
t.abort = oc
return err
}
type DivByZeroError struct{}
func (DivByZeroError) String() string { return "divide by zero" }
type NilPointerError struct{}
func (NilPointerError) String() string { return "nil pointer dereference" }
type IndexError struct {
Idx, Len int64
}
func (e IndexError) String() 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)
}
type SliceError struct {
Lo, Hi, Cap int64
}
func (e SliceError) String() string {
return fmt.Sprintf("slice [%d:%d]; cap %d", e.Lo, e.Hi, e.Cap)
}
type KeyError struct {
Key interface{}
}
func (e KeyError) String() string { return fmt.Sprintf("key '%v' not found in map", e.Key) }
type NegativeLengthError struct {
Len int64
}
func (e NegativeLengthError) String() string {
return fmt.Sprintf("negative length: %d", e.Len)
}
type NegativeCapacityError struct {
Len int64
}
func (e NegativeCapacityError) String() string {
return fmt.Sprintf("negative capacity: %d", e.Len)
}
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