jpath

var (
	// ErrInvalidPath is raised when a JSONPath query cannot be parsed
	ErrInvalidPath = errors.New("invalid JSONPath query")

	// ErrExpectedRoot indicates the query does not start with `$`
	ErrExpectedRoot = errors.New("expected root selector '$'")

	// ErrUnexpectedToken indicates invalid token ordering or placement
	ErrUnexpectedToken = errors.New("unexpected token")

	// ErrUnterminatedString indicates a quoted string was not closed
	ErrUnterminatedString = errors.New("unterminated string")

	// ErrBadEscape indicates an invalid escape sequence in a string literal
	ErrBadEscape = errors.New("invalid escape sequence")

	// ErrBadNumber indicates an invalid numeric literal
	ErrBadNumber = errors.New("invalid number")

	// ErrBadSlice indicates an invalid array slice selector
	ErrBadSlice = errors.New("invalid slice selector")

	// ErrBadFunc indicates an invalid function invocation in a filter
	ErrBadFunc = errors.New("invalid function call")
)

var (
	// ErrUnknownFunc indicates a function name is not registered
	ErrUnknownFunc = errors.New("unknown function")

	// ErrBadFuncName indicates a function name is invalid
	ErrBadFuncName = errors.New("invalid function name")

	// ErrBadFuncDefinition indicates a function definition is invalid
	ErrBadFuncDefinition = errors.New("invalid function definition")

	// ErrFuncExists indicates a function was already registered
	ErrFuncExists = errors.New("function already registered")
)

var (
	// ErrLiteralMustBeCompared is raised for bare literals in logical context
	ErrLiteralMustBeCompared = errors.New("literal must be compared")

	// ErrCompRequiresSingularQuery is raised for non-singular comparisons
	ErrCompRequiresSingularQuery = errors.New(
		"comparison requires singular query",
	)

	// ErrInvalidFuncArity is raised when function arity is invalid
	ErrInvalidFuncArity = errors.New("invalid function arity")

	// ErrFuncResultMustBeCompared is raised for logical use without compare
	ErrFuncResultMustBeCompared = errors.New(
		"function result must be compared",
	)

	// ErrFuncResultMustNotBeCompared is raised for prohibited comparisons
	ErrFuncResultMustNotBeCompared = errors.New(
		"function result must not be compared",
	)

	// ErrFuncRequiresSingularQuery is raised for singular-path requirements
	ErrFuncRequiresSingularQuery = errors.New(
		"function requires singular query",
	)

	// ErrFuncRequiresQueryArgument is raised for query-arg requirements
	ErrFuncRequiresQueryArgument = errors.New(
		"function requires query argument",
	)
)