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// Copyright 2014 The ql Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSES/QL-LICENSE file.
// Copyright 2015 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package types
import (
"io"
"github.com/pingcap/errors"
"github.com/pingcap/parser/charset"
"github.com/pingcap/parser/mysql"
"github.com/pingcap/parser/opcode"
"github.com/pingcap/parser/terror"
ast "github.com/pingcap/parser/types"
)
// IsTypeBlob returns a boolean indicating whether the tp is a blob type.
var IsTypeBlob = ast.IsTypeBlob
// IsTypeChar returns a boolean indicating
// whether the tp is the char type like a string type or a varchar type.
var IsTypeChar = ast.IsTypeChar
// IsTypeVarchar returns a boolean indicating
// whether the tp is the varchar type like a varstring type or a varchar type.
func IsTypeVarchar(tp byte) bool {
return tp == mysql.TypeVarString || tp == mysql.TypeVarchar
}
// IsTypeUnspecified returns a boolean indicating whether the tp is the Unspecified type.
func IsTypeUnspecified(tp byte) bool {
return tp == mysql.TypeUnspecified
}
// IsTypePrefixable returns a boolean indicating
// whether an index on a column with the tp can be defined with a prefix.
func IsTypePrefixable(tp byte) bool {
return IsTypeBlob(tp) || IsTypeChar(tp)
}
// IsTypeFractionable returns a boolean indicating
// whether the tp can has time fraction.
func IsTypeFractionable(tp byte) bool {
return tp == mysql.TypeDatetime || tp == mysql.TypeDuration || tp == mysql.TypeTimestamp
}
// IsTypeTime returns a boolean indicating
// whether the tp is time type like datetime, date or timestamp.
func IsTypeTime(tp byte) bool {
return tp == mysql.TypeDatetime || tp == mysql.TypeDate || tp == mysql.TypeTimestamp
}
// IsTypeNumeric returns a boolean indicating whether the tp is numeric type.
func IsTypeNumeric(tp byte) bool {
switch tp {
case mysql.TypeBit, mysql.TypeTiny, mysql.TypeInt24, mysql.TypeLong, mysql.TypeLonglong, mysql.TypeNewDecimal,
mysql.TypeDecimal, mysql.TypeFloat, mysql.TypeDouble, mysql.TypeShort:
return true
}
return false
}
// IsTemporalWithDate returns a boolean indicating
// whether the tp is time type with date.
func IsTemporalWithDate(tp byte) bool {
return IsTypeTime(tp)
}
// IsBinaryStr returns a boolean indicating
// whether the field type is a binary string type.
func IsBinaryStr(ft *FieldType) bool {
return ft.Collate == charset.CollationBin && IsString(ft.Tp)
}
// IsNonBinaryStr returns a boolean indicating
// whether the field type is a non-binary string type.
func IsNonBinaryStr(ft *FieldType) bool {
if ft.Collate != charset.CollationBin && IsString(ft.Tp) {
return true
}
return false
}
// IsString returns a boolean indicating
// whether the field type is a string type.
func IsString(tp byte) bool {
return IsTypeChar(tp) || IsTypeBlob(tp) || IsTypeVarchar(tp) || IsTypeUnspecified(tp)
}
var kind2Str = map[byte]string{
KindNull: "null",
KindInt64: "bigint",
KindUint64: "unsigned bigint",
KindFloat32: "float",
KindFloat64: "double",
KindString: "char",
KindBytes: "bytes",
KindBinaryLiteral: "bit/hex literal",
KindMysqlDecimal: "decimal",
KindMysqlDuration: "time",
KindMysqlEnum: "enum",
KindMysqlBit: "bit",
KindMysqlSet: "set",
KindMysqlTime: "datetime",
KindInterface: "interface",
KindMinNotNull: "min_not_null",
KindMaxValue: "max_value",
KindRaw: "raw",
KindMysqlJSON: "json",
}
// TypeStr converts tp to a string.
var TypeStr = ast.TypeStr
// KindStr converts kind to a string.
func KindStr(kind byte) (r string) {
return kind2Str[kind]
}
// TypeToStr converts a field to a string.
// It is used for converting Text to Blob,
// or converting Char to Binary.
// Args:
// tp: type enum
// cs: charset
var TypeToStr = ast.TypeToStr
// EOFAsNil filtrates errors,
// If err is equal to io.EOF returns nil.
func EOFAsNil(err error) error {
if terror.ErrorEqual(err, io.EOF) {
return nil
}
return errors.Trace(err)
}
// InvOp2 returns an invalid operation error.
func InvOp2(x, y interface{}, o opcode.Op) (interface{}, error) {
return nil, errors.Errorf("Invalid operation: %v %v %v (mismatched types %T and %T)", x, o, y, x, y)
}
// overflow returns an overflowed error.
func overflow(v interface{}, tp byte) error {
return ErrOverflow.GenWithStack("constant %v overflows %s", v, TypeStr(tp))
}
// IsTypeTemporal checks if a type is a temporal type.
func IsTypeTemporal(tp byte) bool {
switch tp {
case mysql.TypeDuration, mysql.TypeDatetime, mysql.TypeTimestamp,
mysql.TypeDate, mysql.TypeNewDate:
return true
}
return false
}
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