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arf/infoerr/error.go
2022-08-30 01:11:10 -04:00

100 lines
1.9 KiB
Go

package infoerr
import "os"
import "fmt"
import "git.tebibyte.media/arf/arf/file"
type ErrorKind int
const (
ErrorKindError ErrorKind = iota
ErrorKindWarn
)
type Error struct {
file.Location
message string
kind ErrorKind
}
// NewError creates a new error at the specified location.
func NewError (
location file.Location,
message string,
kind ErrorKind,
) (
err Error,
) {
return Error {
Location: location,
message: message,
kind: kind,
}
}
// Error returns a formatted error message as a string.
func (err Error) Error () (formattedMessage string) {
switch err.kind {
case ErrorKindError:
formattedMessage += "\033[31mERR\033[0m"
case ErrorKindWarn:
formattedMessage += "\033[33m!!!\033[0m"
}
// print information about the location of the mistake
if err.Width() > 0 {
formattedMessage += fmt.Sprint (
" \033[34m", err.Row() + 1,
":", err.Column() + 1)
}
formattedMessage +=
" \033[90min\033[0m " +
err.File().Path() + "\n"
if err.Width() > 0 {
// print erroneous line
line := err.File().GetLine(err.Row())
formattedMessage += line + "\n"
// position error marker
var index int
for index = 0; index < err.Column(); index ++ {
if line[index] == '\t' {
formattedMessage += "\t"
} else {
formattedMessage += " "
}
}
// print an arrow with a tail spanning the width of the mistake
for index < err.Column() + err.Width() - 1 {
if line[index] == '\t' {
formattedMessage += "--------"
} else {
formattedMessage += "-"
}
index ++
}
formattedMessage += "^\n"
}
formattedMessage += err.message + "\n"
return
}
// Print formats the error and prints it to stderr.
func (err Error) Print () {
os.Stderr.Write([]byte(err.Error()))
}
// Message returns the error's message string
func (err Error) Message () (message string) {
return err.message
}
// Kind returns what kind of error the error is.
func (err Error) Kind () (kind ErrorKind) {
return err.kind
}