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package parser
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
synErrIDInvalidChar = newSyntaxError("an identifier can contain only the lower-case letter, the digits, and the underscore")
synErrIDInvalidUnderscorePos = newSyntaxError("the underscore cannot be placed at the beginning or end of an identifier")
synErrIDConsecutiveUnderscores = newSyntaxError("the underscore cannot be placed consecutively")
synErrIDInvalidDigitsPos = newSyntaxError("the digits cannot be placed at the biginning of an identifier")
synErrUnclosedTerminal = newSyntaxError("unclosed terminal")
synErrUnclosedString = newSyntaxError("unclosed string")
synErrIncompletedEscSeq = newSyntaxError("incompleted escape sequence; unexpected EOF following a backslash")
synErrEmptyPattern = newSyntaxError("a pattern must include at least one character")
synErrEmptyString = newSyntaxError("a string must include at least one character")
// syntax errors
synErrInvalidToken = newSyntaxError("invalid token")
synErrTopLevelDirNoSemicolon = newSyntaxError("a top-level directive must be followed by ;")
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")
synErrLabelWithNoSymbol = newSyntaxError("a label must follow a symbol")
synErrNoLabel = newSyntaxError("an identifier that represents a label is missing after the label marker @")
synErrNoDirectiveName = newSyntaxError("a directive needs a name")
synErrNoOrderedSymbolName = newSyntaxError("an ordered symbol name is missing")
synErrUnclosedDirGroup = newSyntaxError("a directive group must be closed by )")
synErrPatternInAlt = newSyntaxError("a pattern literal cannot appear directly in an alternative. instead, please define a terminal symbol with the pattern literal")
synErrStrayExpOp = newSyntaxError("an expansion operator ... must be preceded by an identifier")
synErrInvalidExpOperand = newSyntaxError("an expansion operator ... can be applied to only an identifier")
synErrSemicolonNoNewline = newSyntaxError("a semicolon must be followed by a newline")
synErrFragmentNoPattern = newSyntaxError("a fragment needs one pattern element")
)
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