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package lexer
import "fmt"
// This file exists to break circular imports. The types and functions in here
// mirror those in the participle package.
type errorInterface interface {
error
Message() string
Position() Position
}
// Error represents an error while lexing.
//
// It complies with the participle.Error interface.
type Error struct {
Msg string
Pos Position
}
var _ errorInterface = &Error{}
// Creates a new Error at the given position.
func errorf(pos Position, format string, args ...interface{}) *Error {
return &Error{Msg: fmt.Sprintf(format, args...), Pos: pos}
}
func (e *Error) Message() string { return e.Msg } // nolint: golint
func (e *Error) Position() Position { return e.Pos } // nolint: golint
// Error formats the error with FormatError.
func (e *Error) Error() string { return formatError(e.Pos, e.Msg) }
// 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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