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package grammar
import "errors"
var (
semErrNoGrammarName = errors.New("name is missing")
semErrSpellingInconsistency = errors.New("the identifiers are treated as the same. please use the same spelling")
semErrDuplicateAssoc = errors.New("associativity and precedence cannot be specified multiple times for a symbol")
semErrUndefinedPrec = errors.New("symbol must has precedence")
semErrUndefinedOrdSym = errors.New("undefined ordered symbol")
semErrUnusedProduction = errors.New("unused production")
semErrUnusedTerminal = errors.New("unused terminal")
semErrTermCannotBeSkipped = errors.New("a terminal used in productions cannot be skipped")
semErrNoProduction = errors.New("a grammar needs at least one production")
semErrUndefinedSym = errors.New("undefined symbol")
semErrDuplicateProduction = errors.New("duplicate production")
semErrDuplicateTerminal = errors.New("duplicate terminal")
semErrDuplicateFragment = errors.New("duplicate fragment")
semErrDuplicateName = errors.New("duplicate names are not allowed between terminals and non-terminals")
semErrErrSymIsReserved = errors.New("symbol 'error' is reserved as a terminal symbol")
semErrDuplicateLabel = errors.New("a label must be unique in an alternative")
semErrInvalidLabel = errors.New("a label must differ from terminal symbols or non-terminal symbols")
semErrDirInvalidName = errors.New("invalid directive name")
semErrDirInvalidParam = errors.New("invalid parameter")
semErrDuplicateDir = errors.New("a directive must not be duplicated")
semErrDuplicateElem = errors.New("duplicate element")
semErrAmbiguousElem = errors.New("ambiguous element")
semErrInvalidProdDir = errors.New("invalid production directive")
semErrInvalidAltDir = errors.New("invalid alternative directive")
)
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