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package spec
import "fmt"
type SyntaxError struct {
message string
}
func newSyntaxError(message string) *SyntaxError {
return &SyntaxError{
message: message,
}
}
func (e *SyntaxError) Error() string {
return fmt.Sprintf("syntax error: %s", e.message)
}
var (
// lexical errors
synErrUnclosedTerminal = newSyntaxError("unclosed terminal")
synErrInvalidEscSeq = newSyntaxError("invalid escape sequence")
synErrIncompletedEscSeq = newSyntaxError("incompleted escape sequence; unexpected EOF following \\")
// syntax errors
synErrInvalidToken = newSyntaxError("invalid token")
synErrNoProduction = newSyntaxError("a grammar must have at least one production")
synErrNoProductionName = newSyntaxError("a production name is missing")
synErrNoColon = newSyntaxError("the colon must precede alternatives")
synErrNoSemicolon = newSyntaxError("the semicolon is missing at the last of an alternative")
synErrNoElement = newSyntaxError("an alternative must have at least one element")
)
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