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package participle
import (
"fmt"
"github.com/alecthomas/participle/lexer"
)
// Error represents an error while parsing.
//
// The error will contain positional information if available.
type Error interface {
error
// Unadorned message.
Message() string
// Closest token to error location.
Token() lexer.Token
}
// UnexpectedTokenError is returned by Parse when an unexpected token is encountered.
//
// This is useful for composing parsers in order to detect when a sub-parser has terminated.
type UnexpectedTokenError struct {
Unexpected lexer.Token
Expected string
}
func (u UnexpectedTokenError) Error() string {
return lexer.FormatError(u.Unexpected.Pos, u.Message())
}
func (u UnexpectedTokenError) Message() string { // nolint: golint
var expected string
if u.Expected != "" {
expected = fmt.Sprintf(" (expected %s)", u.Expected)
}
return fmt.Sprintf("unexpected token %q%s", u.Unexpected, expected)
}
func (u UnexpectedTokenError) Token() lexer.Token { return u.Unexpected } // nolint: golint
type parseError struct {
Msg string
Tok lexer.Token
}
func (p *parseError) Error() string { return lexer.FormatError(p.Tok.Pos, p.Msg) }
func (p *parseError) Message() string { return p.Msg }
func (p *parseError) Token() lexer.Token { return p.Tok }
// AnnotateError wraps an existing error with a position.
//
// If the existing error is a lexer.Error or participle.Error it will be returned unmodified.
func AnnotateError(pos lexer.Position, err error) error {
if perr, ok := err.(Error); ok {
return perr
}
return &parseError{Msg: err.Error(), Tok: lexer.Token{Pos: pos}}
}
// Errorf creats a new Error at the given position.
func Errorf(pos lexer.Position, format string, args ...interface{}) error {
return &parseError{Msg: fmt.Sprintf(format, args...), Tok: lexer.Token{Pos: pos}}
}
// ErrorWithTokenf creats a new Error with the given token as context.
func ErrorWithTokenf(tok lexer.Token, format string, args ...interface{}) error {
return &parseError{Msg: fmt.Sprintf(format, args...), Tok: tok}
}
// Wrapf attempts to wrap an existing participle.Error in a new message.
func Wrapf(pos lexer.Position, err error, format string, args ...interface{}) error {
if perr, ok := err.(Error); ok {
return Errorf(perr.Token().Pos, "%s: %s", fmt.Sprintf(format, args...), perr.Message())
}
return Errorf(pos, "%s: %s", fmt.Sprintf(format, args...), err.Error())
}
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