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|
package otto
import (
"errors"
"fmt"
"strings"
"github.com/robertkrimen/otto/file"
)
type _exception struct {
value interface{}
}
func newException(value interface{}) *_exception {
return &_exception{
value: value,
}
}
func (self *_exception) eject() interface{} {
value := self.value
self.value = nil // Prevent Go from holding on to the value, whatever it is
return value
}
type _error struct {
name string
message string
trace []_frame
offset int
}
type _frame struct {
file *file.File
offset int
callee string
}
var (
nativeFrame = _frame{}
)
type _at int
func (fr _frame) location() string {
if fr.file == nil {
return "<unknown>"
}
path := fr.file.Name()
line, column := _position(fr.file, fr.offset)
if path == "" {
path = "<anonymous>"
}
str := fmt.Sprintf("%s:%d:%d", path, line, column)
if fr.callee != "" {
str = fmt.Sprintf("%s (%s)", fr.callee, str)
}
return str
}
func _position(file *file.File, offset int) (line, column int) {
{
offset := offset - file.Base()
if offset < 0 {
return -offset, -1
}
src := file.Source()
if offset >= len(src) {
return -offset, -len(src)
}
src = src[:offset]
line := 1 + strings.Count(src, "\n")
column := 0
if index := strings.LastIndex(src, "\n"); index >= 0 {
column = offset - index
} else {
column = 1 + len(src)
}
return line, column
}
}
// An Error represents a runtime error, e.g. a TypeError, a ReferenceError, etc.
type Error struct {
_error
}
// Error returns a description of the error
//
// TypeError: 'def' is not a function
//
func (err Error) Error() string {
if len(err.name) == 0 {
return err.message
}
if len(err.message) == 0 {
return err.name
}
return fmt.Sprintf("%s: %s", err.name, err.message)
}
// String returns a description of the error and a trace of where the
// error occurred.
//
// TypeError: 'def' is not a function
// at xyz (<anonymous>:3:9)
// at <anonymous>:7:1/
//
func (err Error) String() string {
str := err.Error() + "\n"
for _, frame := range err.trace {
str += " at " + frame.location() + "\n"
}
return str
}
func (err _error) describe(format string, in ...interface{}) string {
return fmt.Sprintf(format, in...)
}
func (self _error) messageValue() Value {
if self.message == "" {
return Value{}
}
return toValue_string(self.message)
}
func (rt *_runtime) typeErrorResult(throw bool) bool {
if throw {
panic(rt.panicTypeError())
}
return false
}
func newError(rt *_runtime, name string, in ...interface{}) _error {
err := _error{
name: name,
offset: -1,
}
description := ""
length := len(in)
if rt != nil {
scope := rt.scope
frame := scope.frame
if length > 0 {
if at, ok := in[length-1].(_at); ok {
in = in[0 : length-1]
if scope != nil {
frame.offset = int(at)
}
length -= 1
}
if length > 0 {
description, in = in[0].(string), in[1:]
}
}
limit := 10
err.trace = append(err.trace, frame)
if scope != nil {
for limit > 0 {
scope = scope.outer
if scope == nil {
break
}
if scope.frame.offset >= 0 {
err.trace = append(err.trace, scope.frame)
}
limit--
}
}
} else {
if length > 0 {
description, in = in[0].(string), in[1:]
}
}
err.message = err.describe(description, in...)
return err
}
func (rt *_runtime) panicTypeError(argumentList ...interface{}) *_exception {
return &_exception{
value: newError(rt, "TypeError", argumentList...),
}
}
func (rt *_runtime) panicReferenceError(argumentList ...interface{}) *_exception {
return &_exception{
value: newError(rt, "ReferenceError", argumentList...),
}
}
func (rt *_runtime) panicURIError(argumentList ...interface{}) *_exception {
return &_exception{
value: newError(rt, "URIError", argumentList...),
}
}
func (rt *_runtime) panicSyntaxError(argumentList ...interface{}) *_exception {
return &_exception{
value: newError(rt, "SyntaxError", argumentList...),
}
}
func (rt *_runtime) panicRangeError(argumentList ...interface{}) *_exception {
return &_exception{
value: newError(rt, "RangeError", argumentList...),
}
}
func catchPanic(function func()) (err error) {
defer func() {
if caught := recover(); caught != nil {
if exception, ok := caught.(*_exception); ok {
caught = exception.eject()
}
switch caught := caught.(type) {
case _error:
err = &Error{caught}
return
case Value:
if vl := caught._object(); vl != nil {
switch vl := vl.value.(type) {
case _error:
err = &Error{vl}
return
}
}
err = errors.New(caught.string())
return
}
panic(caught)
}
}()
function()
return nil
}
|
