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types.go
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/
types.go
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// Copyright 2015 The Cockroach Authors.
//
// 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License. See the AUTHORS file
// for names of contributors.
//
// Author: Peter Mattis (peter@cockroachlabs.com)
package parser
import (
"bytes"
"fmt"
)
const (
astInt = "INT"
astInteger = "INTEGER"
astSmallInt = "SMALLINT"
astBigInt = "BIGINT"
astReal = "REAL"
astDouble = "DOUBLE PRECISION"
astFloat = "FLOAT"
astDecimal = "DECIMAL"
astNumeric = "NUMERIC"
astChar = "CHAR"
astVarChar = "VARCHAR"
)
// ColumnType represents a type in a column definition.
type ColumnType interface {
fmt.Stringer
columnType()
}
func (*BitType) columnType() {}
func (*BoolType) columnType() {}
func (*IntType) columnType() {}
func (*FloatType) columnType() {}
func (*DecimalType) columnType() {}
func (*DateType) columnType() {}
func (*TimeType) columnType() {}
func (*TimestampType) columnType() {}
func (*CharType) columnType() {}
func (*TextType) columnType() {}
func (*BlobType) columnType() {}
// BitType represents a BIT type.
type BitType struct {
N int
}
func (node *BitType) String() string {
var buf bytes.Buffer
fmt.Fprintf(&buf, "BIT")
if node.N > 0 {
fmt.Fprintf(&buf, "(%d)", node.N)
}
return buf.String()
}
// BoolType represents a BOOLEAN type.
type BoolType struct{}
func (node *BoolType) String() string {
return "BOOLEAN"
}
// IntType represents an INT, INTEGER, SMALLINT or BIGINT type.
type IntType struct {
Name string
N int
}
func (node *IntType) String() string {
var buf bytes.Buffer
_, _ = buf.WriteString(node.Name)
if node.N > 0 {
fmt.Fprintf(&buf, "(%d)", node.N)
}
return buf.String()
}
// FloatType represents a REAL, DOUBLE or FLOAT type.
type FloatType struct {
Name string
Prec int
}
func (node *FloatType) String() string {
var buf bytes.Buffer
_, _ = buf.WriteString(node.Name)
if node.Prec > 0 {
fmt.Fprintf(&buf, "(%d)", node.Prec)
}
return buf.String()
}
// DecimalType represents a DECIMAL or NUMERIC type.
type DecimalType struct {
Name string
Prec int
Scale int
}
func (node *DecimalType) String() string {
var buf bytes.Buffer
_, _ = buf.WriteString(node.Name)
if node.Prec > 0 {
fmt.Fprintf(&buf, "(%d", node.Prec)
if node.Scale > 0 {
fmt.Fprintf(&buf, ",%d", node.Scale)
}
_, _ = buf.WriteString(")")
}
return buf.String()
}
// DateType represents a DATE type.
type DateType struct {
}
func (node *DateType) String() string {
return "DATE"
}
// TimeType represents a TIME type.
type TimeType struct {
}
func (node *TimeType) String() string {
return "TIME"
}
// TimestampType represents a TIMESTAMP type.
type TimestampType struct {
}
func (node *TimestampType) String() string {
return "TIMESTAMP"
}
// CharType represents a CHAR or VARCHAR type.
type CharType struct {
Name string
N int
}
func (node *CharType) String() string {
var buf bytes.Buffer
_, _ = buf.WriteString(node.Name)
if node.N > 0 {
fmt.Fprintf(&buf, "(%d)", node.N)
}
return buf.String()
}
// TextType represents a TEXT type.
type TextType struct {
Name string
}
func (node *TextType) String() string {
return "TEXT"
}
// BlobType represents a BLOB type.
type BlobType struct {
Name string
}
func (node *BlobType) String() string {
return "BLOB"
}