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package lexer
import "fmt"
// Error represents an error while parsing.
type Error struct {
Msg string
Tok Token
}
// Errorf creats a new Error at the given position.
func Errorf(pos Position, format string, args ...interface{}) *Error {
return &Error{Msg: fmt.Sprintf(format, args...), Tok: Token{Pos: pos}}
}
// ErrorWithTokenf creats a new Error with the given token as context.
func ErrorWithTokenf(tok Token, format string, args ...interface{}) *Error {
return &Error{Msg: fmt.Sprintf(format, args...), Tok: tok}
}
func (e *Error) Message() string { return e.Msg } // nolint: golint
func (e *Error) Token() Token { return e.Tok } // nolint: golint
// Error complies with the error interface and reports the position of an error.
func (e *Error) Error() string {
return FormatError(e.Tok.Pos, e.Msg)
}
// FormatError formats an error in the form "[<filename>:][<line>:<pos>:] <message>"
func FormatError(pos Position, message string) string {
msg := ""
if pos.Filename != "" {
msg += pos.Filename + ":"
}
if pos.Line != 0 || pos.Column != 0 {
msg += fmt.Sprintf("%d:%d:", pos.Line, pos.Column)
}
if msg != "" {
msg += " " + message
} else {
msg = message
}
return msg
}
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