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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 \\")
synErrZeroPos = newSyntaxError("a position must be greater than or equal to 1")
// 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")
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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