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package spec
type SyntaxError struct {
message string
}
func newSyntaxError(message string) *SyntaxError {
return &SyntaxError{
message: message,
}
}
func (e *SyntaxError) Error() string {
return e.message
}
var (
// lexical errors
synErrAutoGenID = newSyntaxError("you cannot define an identifier beginning with an underscore")
synErrUnclosedTerminal = newSyntaxError("unclosed terminal")
synErrInvalidEscSeq = newSyntaxError("invalid escape sequence")
synErrIncompletedEscSeq = newSyntaxError("incompleted escape sequence; unexpected EOF following a backslash")
synErrEmptyPattern = newSyntaxError("a pattern must include at least one character")
synErrZeroPos = newSyntaxError("a position must be greater than or equal to 1")
// syntax errors
synErrInvalidToken = newSyntaxError("invalid token")
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")
synErrNoDirectiveName = newSyntaxError("a directive needs a name")
synErrProdDirNoNewline = newSyntaxError("a production directive must be followed by a newline")
synErrSemicolonNoNewline = newSyntaxError("a semicolon must be followed by a newline")
synErrFragmentNoPattern = newSyntaxError("a fragment needs one pattern element")
synErrTreeInvalidFirstElem = newSyntaxError("the first element of a tree structure must be an ID")
synErrTreeUnclosed = newSyntaxError("unclosed tree structure")
)
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