// backendNewColor returns a new colorful error string using the following
// format:
// pkg.func (file:line): error: text
func backendNewColor(text string, skip int) error {
pc, file, line, ok := runtime.Caller(skip)
if !ok {
return errors.New(term.RedBold("error: ") + text)
}
f := runtime.FuncForPC(pc)
if f == nil {
format := term.WhiteBold("(%s:%d): ") + term.RedBold("error: ") + "%s"
return fmt.Errorf(format, path.Base(file), line, text)
}
format := term.MagentaBold("%s") + term.WhiteBold(" (%s:%d): ") + term.RedBold("error: ") + "%s"
return fmt.Errorf(format, f.Name(), path.Base(file), line, text)
}
// Error returns an error string with position information.
//
// The error format is as follows:
// pkg.func (file:line): error: text
func (e *ErrInfo) Error() string {
text := "<nil>"
if e.Err != nil {
text = e.Err.Error()
}
if UseColor {
// Use colors.
prefix := term.RedBold("error:")
if e.pos == nil {
return fmt.Sprintf("%s %s", prefix, text)
}
return fmt.Sprintf("%s %s %s", e.pos, prefix, text)
}
// No colors.
if e.pos == nil {
return text
}
return fmt.Sprintf("%s %s", e.pos, text)
}
// Error returns an error string with position information.
//
// The error format is as follows.
//
// (file:line:column): error: text
func (e *Error) Error() string {
// Use colors.
pos := fmt.Sprintf("(byte offset %d)", e.Pos)
prefix := "error:"
text := e.Text
if UseColor {
pos = term.Color(pos, term.Bold)
prefix = term.RedBold(prefix)
text = term.Color(text, term.Bold)
}
src := e.Src
if src == nil {
// If Src is nil, the error format is as follows.
//
// (byte offset %d) error: text
return fmt.Sprintf("%s %s %s", pos, prefix, text)
}
// The error format is as follows.
//
// (file:line) error: text
// 1 = y
// ^
line, col := src.Position(e.Pos)
end := len(src.Input)
if len(src.Lines) > line {
end = src.Lines[line]
}
srcLine := src.Input[src.Lines[line-1]:end]
srcLine = strings.Replace(srcLine, "\t", " ", -1)
srcLine = strings.TrimRight(srcLine, "\n\r")
arrow := fmt.Sprintf("%*s", col, "^")
pos = fmt.Sprintf("(%s:%d)", src.Path, line)
if UseColor {
pos = term.Color(pos, term.Bold)
arrow = term.Color(arrow, term.Bold)
}
return fmt.Sprintf("%s %s %s\n%s\n%s", pos, prefix, text, srcLine, arrow)
}