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feat: SyntaxError.Error() always calls Description() (#152)

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Co-authored-by: duanyi.aster <duanyi.aster@bytedance.com>
This commit is contained in:
Yi Duan 2021-12-09 13:11:31 +08:00 committed by GitHub
parent d5104197c4
commit 7d3b22100f
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 17 additions and 15 deletions
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15
README.md
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@ -123,26 +123,23 @@ v, err := encoder.Encode(m, encoder.SortMapKeys)
### Print Syntax Error
```go
import "github.com/bytedance/sonic"
import "github.com/bytedance/sonic/decoder"
var data interface{}
dc := decoder.NewDecoder("[[[}]]")
if err := dc.Decode(&data); err != nil {
err := sonic.Unmarshal("[[[}]]", &data)
if err != nil {
/*one line by default*/
println(e.Error())) // "Syntax error at index 3: invalid char\n\n\t[[[}]]\n\t...^..\n"
/*pretty print*/
if e, ok := err.(decoder.SyntaxError); ok {
/*Syntax error at index 3: invalid char
[[[}]]
...^..
*/
print(e.Description())
/*"Syntax error at index 3: invalid char\n\n\t[[[}]]\n\t...^..\n"*/
println(fmt.Sprintf("%q", e.Description()))
}
/*Decode: Syntax error at index 3: invalid char*/
t.Fatalf("Decode: %v", err)
}
```

9
decoder/errors.go
View file

@ -35,7 +35,7 @@ type SyntaxError struct {
}
func (self SyntaxError) Error() string {
return fmt.Sprintf("Syntax error at index %d: %s", self.Pos, self.Code.Message())
return fmt.Sprintf("%q", self.Description())
}
func (self SyntaxError) Description() string {
@ -45,7 +45,7 @@ func (self SyntaxError) Description() string {
/* check for empty source */
if self.Src == "" {
return self.Error() + " (no sources available)"
return fmt.Sprintf("no sources available: %#v", self)
}
/* prevent slicing before the beginning */
@ -71,8 +71,9 @@ func (self SyntaxError) Description() string {
/* compose the error description */
return fmt.Sprintf(
"%s\n\n\t%s\n\t%s^%s\n",
self.Error(),
"Syntax error at index %d: %s\n\n\t%s\n\t%s^%s\n",
self.Pos,
self.Code.Message(),
self.Src[p:q],
strings.Repeat(".", x),
strings.Repeat(".", y),

8
decoder/errors_test.go
View file

@ -21,6 +21,7 @@ import (
`testing`
`github.com/bytedance/sonic/internal/native/types`
`github.com/stretchr/testify/assert`
)
func make_err(src string, pos int) SyntaxError {
@ -48,7 +49,10 @@ func TestErrors_AfterRightEdge(t *testing.T) {
}
func TestErrors_ShortDescription(t *testing.T) {
println(make_err("hello, world", 5).Description())
e := make_err("hello, world", 5)
println(e.Description())
assert.Equal(t, "Syntax error at index 5: invalid char\n\n\thello, world\n\t.....^......\n", e.Description())
assert.Equal(t, `"Syntax error at index 5: invalid char\n\n\thello, world\n\t.....^......\n"`, e.Error())
}
func TestErrors_EmptyDescription(t *testing.T) {
@ -61,7 +65,7 @@ func TestDecoderErrorStackOverflower(t *testing.T) {
for i:=0; i<N; i++ {
var obj map[string]string
err := NewDecoder(src).Decode(&obj)
if err == nil || err.Error() != `Syntax error at index 5: invalid char` {
if err == nil {
t.Fatal(err)
}
}