71 lines
1.8 KiB
Go
71 lines
1.8 KiB
Go
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package lexer
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import "fmt"
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// This file exists to break circular imports. The types and functions in here
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// mirror those in the participle package.
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type errorInterface interface {
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error
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Message() string
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Position() Position
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}
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// Error represents an error while lexing.
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//
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// It complies with the participle.Error interface.
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type lexerError struct {
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Msg string
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Pos Position
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}
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var _ errorInterface = &lexerError{}
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// Creates a new Error at the given position.
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func errorf(pos Position, format string, args ...interface{}) *lexerError {
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return &lexerError{Msg: fmt.Sprintf(format, args...), Pos: pos}
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}
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func (e *lexerError) Message() string { return e.Msg } // nolint: golint
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func (e *lexerError) Position() Position { return e.Pos } // nolint: golint
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// Error formats the error with FormatError.
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func (e *lexerError) Error() string { return formatError(e.Pos, e.Msg) }
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// An error in the form "[<filename>:][<line>:<pos>:] <message>"
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func formatError(pos Position, message string) string {
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msg := ""
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if pos.Filename != "" {
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msg += pos.Filename + ":"
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}
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if pos.Line != 0 || pos.Column != 0 {
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msg += fmt.Sprintf("%d:%d:", pos.Line, pos.Column)
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}
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if msg != "" {
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msg += " " + message
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} else {
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msg = message
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}
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return msg
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}
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type wrappingLexerError struct {
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err error
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lexerError
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}
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var _ errorInterface = &wrappingLexerError{}
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func (w *wrappingLexerError) Unwrap() error { return w.err }
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func wrapf(pos Position, err error, format string, args ...interface{}) error {
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var msg string
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if perr, ok := err.(errorInterface); ok {
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pos = perr.Position()
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msg = fmt.Sprintf("%s: %s", fmt.Sprintf(format, args...), perr.Message())
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} else {
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msg = fmt.Sprintf("%s: %s", fmt.Sprintf(format, args...), err.Error())
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}
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return &wrappingLexerError{err: err, lexerError: lexerError{Msg: msg, Pos: pos}}
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}
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