package parser import "fmt" var ( ParseErr = fmt.Errorf("parse error") // lexical errors synErrIncompletedEscSeq = fmt.Errorf("incompleted escape sequence; unexpected EOF following \\") synErrInvalidEscSeq = fmt.Errorf("invalid escape sequence") synErrInvalidCodePoint = fmt.Errorf("code points must consist of just 4 or 6 hex digits") synErrCharPropInvalidSymbol = fmt.Errorf("invalid character property symbol") SynErrFragmentInvalidSymbol = fmt.Errorf("invalid fragment symbol") // syntax errors synErrUnexpectedToken = fmt.Errorf("unexpected token") synErrNullPattern = fmt.Errorf("a pattern must be a non-empty byte sequence") synErrUnmatchablePattern = fmt.Errorf("a pattern cannot match any characters") synErrAltLackOfOperand = fmt.Errorf("an alternation expression must have operands") synErrRepNoTarget = fmt.Errorf("a repeat expression must have an operand") synErrGroupNoElem = fmt.Errorf("a grouping expression must include at least one character") synErrGroupUnclosed = fmt.Errorf("unclosed grouping expression") synErrGroupNoInitiator = fmt.Errorf(") needs preceding (") synErrGroupInvalidForm = fmt.Errorf("invalid grouping expression") synErrBExpNoElem = fmt.Errorf("a bracket expression must include at least one character") synErrBExpUnclosed = fmt.Errorf("unclosed bracket expression") synErrBExpInvalidForm = fmt.Errorf("invalid bracket expression") synErrRangeInvalidOrder = fmt.Errorf("a range expression with invalid order") synErrRangePropIsUnavailable = fmt.Errorf("a property expression is unavailable in a range expression") synErrRangeInvalidForm = fmt.Errorf("invalid range expression") synErrCPExpInvalidForm = fmt.Errorf("invalid code point expression") synErrCPExpOutOfRange = fmt.Errorf("a code point must be between U+0000 to U+10FFFF") synErrCharPropExpInvalidForm = fmt.Errorf("invalid character property expression") synErrCharPropUnsupported = fmt.Errorf("unsupported character property") synErrFragmentExpInvalidForm = fmt.Errorf("invalid fragment expression") )