expr

var (
	ErrValuePlaceholderNotFound    = errors.New("value placeholder not found")
	ErrUnsupportedNodeType         = errors.New("unsupported node type")
	ErrSizeExpectsOneArg           = errors.New("size() expects 1 argument")
	ErrAttributeExistsExpectsPath  = errors.New("attribute_exists() expects a path")
	ErrAttributeExistsExpectsOne   = errors.New("attribute_exists() expects 1 argument")
	ErrAttributeNExistsExpectsPath = errors.New("attribute_not_exists() expects a path")
	ErrAttributeNExistsExpectsOne  = errors.New("attribute_not_exists() expects 1 argument")
	ErrBeginsWithExpectsTwo        = errors.New("begins_with() expects 2 arguments")
	ErrContainsExpectsTwo          = errors.New("contains() expects 2 arguments")
	ErrAttributeTypeExpectsTwo     = errors.New("attribute_type() expects 2 arguments")
	ErrListAppendExpectsTwo        = errors.New("list_append() expects 2 arguments")
	ErrUnknownFunction             = errors.New("unknown function")
	ErrUpdatePathMustBePathExpr    = errors.New("update item path must be a PathExpr")
	ErrExpectedMapForKey           = errors.New("expected map for key")
	ErrExpectedListAtIndex         = errors.New("expected list at index")
	ErrExpectedListForIndex        = errors.New("expected list for index")
	ErrIndexOutOfRange             = errors.New("index out of range")
	ErrExpectedMapForM             = errors.New("expected map for M")
	ErrExpectedListForL            = errors.New("expected list for L")
	ErrUnsupportedArithmeticOp     = errors.New("unsupported arithmetic operator")
	ErrIfNotExistsExpectsTwo       = errors.New("if_not_exists() expects 2 arguments")
	ErrDeleteValueMustBeSet        = errors.New("DELETE value must be a set")
	ErrSSValueMustBeSlice          = errors.New("SS value must be []string")
	ErrCurrentValueMustBeMap       = errors.New("current value must be a map")
	ErrCurrentSSValueMustBeSlice   = errors.New("current SS value must be []string")
	ErrNSValueMustBeSlice          = errors.New("NS value must be []string")
	ErrCurrentNSValueMustBeSlice   = errors.New("current NS value must be []string")
	ErrBSValueMustBeSlice          = errors.New("BS value must be [][]byte")
	ErrCurrentBSValueMustBeSlice   = errors.New("current BS value must be [][]byte")
	ErrSetTypeMismatch             = errors.New(
		"ADD: existing set type does not match the type being added",
	)
	ErrSetSizeOverflow = errors.New("set size overflow")
	ErrInvalidSizeArg  = errors.New(
		"size() only supports String, Binary, Map, List, and Set types",
	)
	ErrUnsupportedAddType = errors.New(
		"ADD action is only supported for Number and Set types",
	)
	// ErrDocumentPathInvalidForUpdate matches the real AWS ValidationException
	// message: SET cannot create a nested attribute under a parent map that
	// does not already exist on the item.
	// https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.UpdateExpressions.html
	ErrDocumentPathInvalidForUpdate = errors.New(
		"the document path provided in the update expression is invalid for update",
	)
	// ErrOperandIncorrectType is returned when an update expression operand's
	// runtime type does not match what the operation requires (e.g. ADD/DELETE
	// against an existing attribute that is not a Number/Set, or +/- against a
	// non-Number operand).
	ErrOperandIncorrectType = errors.New(
		"an operand in the update expression has an incorrect data type",
	)
	// ErrOverlappingDocumentPaths is returned when two actions in the same
	// UpdateExpression reference the same or overlapping document paths.
	ErrOverlappingDocumentPaths = errors.New(
		"two document paths overlap with each other; must remove or rewrite one of these paths",
	)
	// ErrContainsOperandsNotDistinct matches the documented contains() restriction:
	// "The path and the operand must be distinct. That is, contains (a, a) returns an error."
	// https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.OperatorsAndFunctions.html
	ErrContainsOperandsNotDistinct = errors.New(
		"contains() arguments must be distinct",
	)
)

var (
	ErrExpectedRParen        = errors.New("expected ) after function args")
	ErrExpectedLParen        = errors.New("expected ( after function name")
	ErrExpectedIdentifierDot = errors.New("expected identifier after dot")
	ErrExpectedRBracket      = errors.New("expected ]")
	ErrExpectedANDInBetween  = errors.New("expected AND in BETWEEN")
	ErrExpectedLParenAfterIN = errors.New("expected ( after IN")
	ErrExpectedRParenAfterIN = errors.New("expected ) after IN candidates")
	ErrExpectedEqualInSET    = errors.New("expected = in SET")
	ErrUnexpectedToken       = errors.New("unexpected token")
	ErrUnexpectedOperand     = errors.New("unexpected operand token")
	ErrExpectedIndex         = errors.New("expected index")
	ErrExpectedRParen2       = errors.New("expected )")
	// ErrTooManyINValues matches the documented IN limit: "The list can
	// contain up to 100 values, separated by commas."
	// https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.OperatorsAndFunctions.html
	ErrTooManyINValues = errors.New("IN operator can have up to 100 values")
	// ErrDuplicateUpdateSection matches AWS rejecting an UpdateExpression that
	// repeats the same SET/REMOVE/ADD/DELETE keyword: "each action keyword can
	// appear only once."
	// https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.UpdateExpressions.html
	ErrDuplicateUpdateSection = errors.New(
		"can only be used once in an update expression",
	)
)

var ErrReservedWord = errors.New("reserved keyword")