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package grammar
type SemanticError struct {
message string
}
func newSemanticError(message string) *SemanticError {
return &SemanticError{
message: message,
}
}
func (e *SemanticError) Error() string {
return e.message
}
var (
semErrMDInvalidName = newSemanticError("invalid meta data name")
semErrMDInvalidParam = newSemanticError("invalid parameter")
semErrMDMissingName = newSemanticError("name is missing")
semErrUnusedProduction = newSemanticError("unused production")
semErrUnusedTerminal = newSemanticError("unused terminal")
semErrTermCannotBeSkipped = newSemanticError("a terminal used in productions cannot be skipped")
semErrNoProduction = newSemanticError("a grammar needs at least one production")
semErrUndefinedSym = newSemanticError("undefined symbol")
semErrDuplicateProduction = newSemanticError("duplicate production")
semErrDuplicateTerminal = newSemanticError("duplicate terminal")
semErrDuplicateName = newSemanticError("duplicate names are not allowed between terminals and non-terminals")
semErrErrSymIsReserved = newSemanticError("symbol 'error' is reserved as a terminal symbol")
semErrDuplicateLabel = newSemanticError("a label must be unique in an alternative")
semErrInvalidLabel = newSemanticError("a label must differ from terminal symbols or non-terminal symbols")
semErrDirInvalidName = newSemanticError("invalid directive name")
semErrDirInvalidParam = newSemanticError("invalid parameter")
)
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