1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
package parser
import (
"bytes"
"errors"
"fmt"
"strings"
)
type ErrorLister interface {
Errors() []error
}
func (e errList) Errors() []error {
return e
}
// ParserError is the public interface to errors of type parserError
type ParserError interface {
Error() string
InnerError() error
Pos() (int, int, int)
Expected() []string
}
func (p *parserError) InnerError() error {
return p.Inner
}
func (p *parserError) Pos() (line, col, offset int) {
return p.pos.line, p.pos.col, p.pos.offset
}
func (p *parserError) Expected() []string {
return p.expected
}
func CaretErrors(err error, input string) error {
if el, ok := err.(ErrorLister); ok {
var buffer bytes.Buffer
for _, e := range el.Errors() {
err1, shouldReturn := caretError(e, input, buffer, err)
if shouldReturn {
return err1
}
}
return errors.New(buffer.String())
}
return err
}
func caretError(e error, input string, buffer bytes.Buffer, err error) (error, bool) {
if parserErr, ok := e.(ParserError); ok {
_, col, off := parserErr.Pos()
line := extractLine(input, off)
if col >= len(line) {
col = len(line) - 1
} else {
if col > 0 {
col--
}
}
if col < 0 {
col = 0
}
pos := col
for _, chr := range line[:col] {
if chr == '\t' {
pos += 7
}
}
fmt.Fprintf(&buffer, "%s\n%s\n%s\n", line, strings.Repeat(" ", pos)+"^", err.Error())
return err, true
} else {
return err, true
}
return nil, false
}
func extractLine(input string, initPos int) string {
if initPos < 0 {
initPos = 0
}
if initPos >= len(input) && len(input) > 0 {
initPos = len(input) - 1
}
startPos := initPos
endPos := initPos
for ; startPos > 0; startPos-- {
if input[startPos] == '\n' {
if startPos != initPos {
startPos++
break
}
}
}
for ; endPos < len(input); endPos++ {
if input[endPos] == '\n' {
if endPos == initPos {
endPos++
}
break
}
}
return input[startPos:endPos]
}
|
