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convert.go
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/
convert.go
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// Copyright 2021-present The Atlas Authors. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.
package postgres
import (
"errors"
"fmt"
"regexp"
"strconv"
"strings"
"ariga.io/atlas/sql/schema"
)
// FormatType converts schema type to its column form in the database.
// An error is returned if the type cannot be recognized.
func FormatType(t schema.Type) (string, error) {
var f string
switch t := t.(type) {
case *ArrayType:
f = strings.ToLower(t.T)
case *BitType:
f = strings.ToLower(t.T)
// BIT without a length is equivalent to BIT(1),
// BIT VARYING has unlimited length.
if f == TypeBit && t.Len > 1 || f == TypeBitVar && t.Len > 0 {
f = fmt.Sprintf("%s(%d)", f, t.Len)
}
case *schema.BoolType:
// BOOLEAN can be abbreviated as BOOL.
if f = strings.ToLower(t.T); f == TypeBool {
f = TypeBoolean
}
case *schema.BinaryType:
f = strings.ToLower(t.T)
case *CurrencyType:
f = strings.ToLower(t.T)
case *CompositeType:
if t.T == "" {
return "", errors.New("postgres: missing composite type name")
}
f = t.T
case *DomainType:
if t.T == "" {
return "", errors.New("postgres: missing domain type name")
}
f = t.T
case *schema.EnumType:
if t.T == "" {
return "", errors.New("postgres: missing enum type name")
}
f = t.T
case *schema.IntegerType:
switch f = strings.ToLower(t.T); f {
case TypeSmallInt, TypeInteger, TypeBigInt:
case TypeInt2:
f = TypeSmallInt
case TypeInt, TypeInt4:
f = TypeInteger
case TypeInt8:
f = TypeBigInt
}
case *IntervalType:
f = strings.ToLower(t.T)
if t.F != "" {
f += " " + strings.ToLower(t.F)
}
if t.Precision != nil && *t.Precision != defaultTimePrecision {
f += fmt.Sprintf("(%d)", *t.Precision)
}
case *schema.StringType:
switch f = strings.ToLower(t.T); f {
case TypeText, TypeBPChar, typeName:
// CHAR(n) is alias for CHARACTER(n). If not length was
// specified, the definition is equivalent to CHARACTER(1).
case TypeChar, TypeCharacter:
n := t.Size
if n == 0 {
n = 1
}
f = fmt.Sprintf("%s(%d)", TypeCharacter, n)
// VARCHAR(n) is alias for CHARACTER VARYING(n). If not length
// was specified, the type accepts strings of any size.
case TypeVarChar, TypeCharVar:
f = TypeCharVar
if t.Size != 0 {
f = fmt.Sprintf("%s(%d)", TypeCharVar, t.Size)
}
default:
return "", fmt.Errorf("postgres: unexpected string type: %q", t.T)
}
case *schema.TimeType:
f = timeAlias(t.T)
if p := t.Precision; p != nil && *p != defaultTimePrecision && strings.HasPrefix(f, "time") {
f += fmt.Sprintf("(%d)", *p)
}
case *schema.FloatType:
switch f = strings.ToLower(t.T); f {
case TypeFloat4:
f = TypeReal
case TypeFloat8:
f = TypeDouble
case TypeFloat:
switch {
case t.Precision > 0 && t.Precision <= 24:
f = TypeReal
case t.Precision == 0 || (t.Precision > 24 && t.Precision <= 53):
f = TypeDouble
default:
return "", fmt.Errorf("postgres: precision for type float must be between 1 and 53: %d", t.Precision)
}
}
case *schema.DecimalType:
switch f = strings.ToLower(t.T); f {
case TypeNumeric:
// The DECIMAL type is an alias for NUMERIC.
case TypeDecimal:
f = TypeNumeric
default:
return "", fmt.Errorf("postgres: unexpected decimal type: %q", t.T)
}
switch p, s := t.Precision, t.Scale; {
case p == 0 && s == 0:
case s < 0:
return "", fmt.Errorf("postgres: decimal type must have scale >= 0: %d", s)
case p == 0 && s > 0:
return "", fmt.Errorf("postgres: decimal type must have precision between 1 and 1000: %d", p)
case s == 0:
f = fmt.Sprintf("%s(%d)", f, p)
default:
f = fmt.Sprintf("%s(%d,%d)", f, p, s)
}
case *SerialType:
switch f = strings.ToLower(t.T); f {
case TypeSmallSerial, TypeSerial, TypeBigSerial:
case TypeSerial2:
f = TypeSmallSerial
case TypeSerial4:
f = TypeSerial
case TypeSerial8:
f = TypeBigSerial
default:
return "", fmt.Errorf("postgres: unexpected serial type: %q", t.T)
}
case *schema.JSONType:
f = strings.ToLower(t.T)
case *schema.UUIDType:
f = strings.ToLower(t.T)
case *schema.SpatialType:
f = strings.ToLower(t.T)
case *NetworkType:
f = strings.ToLower(t.T)
case *RangeType:
switch f = strings.ToLower(t.T); f {
case TypeInt4Range, TypeInt4MultiRange, TypeInt8Range, TypeInt8MultiRange, TypeNumRange, TypeNumMultiRange,
TypeTSRange, TypeTSMultiRange, TypeTSTZRange, TypeTSTZMultiRange, TypeDateRange, TypeDateMultiRange:
default:
return "", fmt.Errorf("postgres: unsupported range type: %q", t.T)
}
case *OIDType:
switch f = strings.ToLower(t.T); f {
case typeOID, typeRegClass, typeRegCollation, typeRegConfig, typeRegDictionary, typeRegNamespace,
typeRegOper, typeRegOperator, typeRegProc, typeRegProcedure, typeRegRole, typeRegType:
default:
return "", fmt.Errorf("postgres: unsupported object identifier type: %q", t.T)
}
case *TextSearchType:
if f = strings.ToLower(t.T); f != TypeTSVector && f != TypeTSQuery {
return "", fmt.Errorf("postgres: unsupported text search type: %q", t.T)
}
case *UserDefinedType:
f = strings.ToLower(t.T)
case *XMLType:
f = strings.ToLower(t.T)
case *PseudoType:
f = strings.ToLower(t.T)
case *schema.UnsupportedType:
return "", fmt.Errorf("postgres: unsupported type: %q", t.T)
default:
return "", fmt.Errorf("postgres: invalid schema type: %T", t)
}
return f, nil
}
// ParseType returns the schema.Type value represented by the given raw type.
// The raw value is expected to follow the format in PostgreSQL information schema
// or as an input for the CREATE TABLE statement.
func ParseType(typ string) (schema.Type, error) {
var (
err error
d *columnDesc
)
// Normalize PostgreSQL array data types from "CREATE TABLE" format to
// "INFORMATION_SCHEMA" format (i.e. as it is inspected from the database).
if t, ok := arrayType(typ); ok {
d = &columnDesc{typ: TypeArray, fmtype: t + "[]"}
} else if d, err = parseColumn(typ); err != nil {
return nil, err
}
t, err := columnType(d)
if err != nil {
return nil, err
}
// If the type is unknown (to us), we fall back to user-defined but expect
// to improve this in future versions by ensuring this against the database.
if ut, ok := t.(*schema.UnsupportedType); ok {
t = &UserDefinedType{T: ut.T}
}
return t, nil
}
func columnType(c *columnDesc) (schema.Type, error) {
var typ schema.Type
switch t := c.typ; strings.ToLower(t) {
case TypeBigInt, TypeInt8, TypeInt, TypeInteger, TypeInt4, TypeSmallInt, TypeInt2, TypeInt64:
typ = &schema.IntegerType{T: t}
case TypeBit, TypeBitVar:
typ = &BitType{T: t, Len: c.size}
case TypeBool, TypeBoolean:
typ = &schema.BoolType{T: t}
case TypeBytea:
typ = &schema.BinaryType{T: t}
case TypeCharacter, TypeChar, TypeCharVar, TypeVarChar, TypeText, TypeBPChar, typeName:
if t == TypeCharacter && c.size == 0 && c.fmtype == TypeBPChar {
t = TypeBPChar
}
// A `character` column without length specifier is equivalent to `character(1)`,
// but `varchar` without length accepts strings of any size (same as `text`).
typ = &schema.StringType{T: t, Size: int(c.size)}
case TypeCIDR, TypeInet, TypeMACAddr, TypeMACAddr8:
typ = &NetworkType{T: t}
case TypeCircle, TypeLine, TypeLseg, TypeBox, TypePath, TypePolygon, TypePoint, TypeGeometry:
typ = &schema.SpatialType{T: t}
case TypeDate:
typ = &schema.TimeType{T: t}
case TypeTime, TypeTimeWOTZ, TypeTimeTZ, TypeTimeWTZ, TypeTimestamp,
TypeTimestampTZ, TypeTimestampWTZ, TypeTimestampWOTZ:
p := defaultTimePrecision
if c.timePrecision != nil {
p = int(*c.timePrecision)
}
typ = &schema.TimeType{T: t, Precision: &p}
case TypeInterval:
p := defaultTimePrecision
if c.timePrecision != nil {
p = int(*c.timePrecision)
}
typ = &IntervalType{T: t, Precision: &p}
if c.interval != "" {
f, ok := intervalField(c.interval)
if !ok {
return &schema.UnsupportedType{T: c.interval}, nil
}
typ.(*IntervalType).F = f
}
case TypeReal, TypeDouble, TypeFloat, TypeFloat4, TypeFloat8:
typ = &schema.FloatType{T: t, Precision: int(c.precision)}
case TypeJSON, TypeJSONB:
typ = &schema.JSONType{T: t}
case TypeMoney:
typ = &CurrencyType{T: t}
case TypeDecimal, TypeNumeric:
typ = &schema.DecimalType{T: t, Precision: int(c.precision), Scale: int(c.scale)}
case TypeSmallSerial, TypeSerial, TypeBigSerial, TypeSerial2, TypeSerial4, TypeSerial8:
typ = &SerialType{T: t, Precision: int(c.precision)}
case TypeUUID:
typ = &schema.UUIDType{T: t}
case TypeXML:
typ = &XMLType{T: t}
case TypeArray:
// Ignore multi-dimensions or size constraints
// as they are ignored by the database.
typ = &ArrayType{T: c.fmtype}
if t, ok := arrayType(c.fmtype); ok {
tt, err := ParseType(t)
if err != nil {
return nil, err
}
typ.(*ArrayType).Type = tt
}
case TypeTSVector, TypeTSQuery:
typ = &TextSearchType{T: t}
case TypeInt4Range, TypeInt4MultiRange, TypeInt8Range, TypeInt8MultiRange, TypeNumRange, TypeNumMultiRange,
TypeTSRange, TypeTSMultiRange, TypeTSTZRange, TypeTSTZMultiRange, TypeDateRange, TypeDateMultiRange:
typ = &RangeType{T: t}
case typeOID, typeRegClass, typeRegCollation, typeRegConfig, typeRegDictionary, typeRegNamespace,
typeRegOper, typeRegOperator, typeRegProc, typeRegProcedure, typeRegRole, typeRegType:
typ = &OIDType{T: t}
case TypeUserDefined:
typ = &UserDefinedType{T: c.fmtype}
case typeAny, typeAnyElement, typeAnyArray, typeAnyNonArray, typeAnyEnum, typeInternal,
typeRecord, typeTrigger, typeVoid, typeUnknown:
typ = &PseudoType{T: t}
default:
typ = &schema.UnsupportedType{T: t}
}
switch c.typtype {
case "d", "e":
// User-defined types supported by Atlas.
typ = &UserDefinedType{T: c.fmtype}
}
return typ, nil
}
// reArray parses array declaration. See: https://postgresql.org/docs/current/arrays.html.
var reArray = regexp.MustCompile(`(?i)(.+?)(( +ARRAY( *\[[ \d]*] *)*)+|( *\[[ \d]*] *)+)$`)
// arrayType reports if the given string is an array type (e.g. int[], text[2]),
// and returns its "udt_name" as it was inspected from the database.
func arrayType(t string) (string, bool) {
matches := reArray.FindStringSubmatch(t)
if len(matches) < 2 {
return "", false
}
return strings.TrimSpace(matches[1]), true
}
// reInterval parses declaration of interval fields. See: https://www.postgresql.org/docs/current/datatype-datetime.html.
var reInterval = regexp.MustCompile(`(?i)(?:INTERVAL\s*)?(YEAR|MONTH|DAY|HOUR|MINUTE|SECOND|YEAR TO MONTH|DAY TO HOUR|DAY TO MINUTE|DAY TO SECOND|HOUR TO MINUTE|HOUR TO SECOND|MINUTE TO SECOND)?\s*(?:\(([0-6])\))?$`)
// intervalField reports if the given string is an interval
// field type and returns its value (e.g. SECOND, MINUTE TO SECOND).
func intervalField(t string) (string, bool) {
matches := reInterval.FindStringSubmatch(t)
if len(matches) != 3 || matches[1] == "" {
return "", false
}
return matches[1], true
}
// columnDesc represents a column descriptor.
type columnDesc struct {
typ string // data_type
fmtype string // pg_catalog.format_type
size int64 // character_maximum_length
typtype string // pg_type.typtype
typelem int64 // pg_type.typelem
typid int64 // pg_type.oid
precision int64
timePrecision *int64
scale int64
parts []string
interval string
}
var reDigits = regexp.MustCompile(`\d`)
func parseColumn(s string) (*columnDesc, error) {
if s == "" {
return nil, errors.New("postgres: unexpected empty column type")
}
parts := strings.FieldsFunc(s, func(r rune) bool {
return r == '(' || r == ')' || r == ' ' || r == ','
})
var (
err error
c = &columnDesc{
typ: parts[0],
parts: parts,
}
)
switch c.parts[0] {
case TypeVarChar, TypeCharVar, TypeChar, TypeCharacter:
if err := parseCharParts(c.parts, c); err != nil {
return nil, err
}
case TypeDecimal, TypeNumeric, TypeFloat:
if len(parts) > 1 {
c.precision, err = strconv.ParseInt(parts[1], 10, 64)
if err != nil {
return nil, fmt.Errorf("postgres: parse precision %q: %w", parts[1], err)
}
}
if len(parts) > 2 {
c.scale, err = strconv.ParseInt(parts[2], 10, 64)
if err != nil {
return nil, fmt.Errorf("postgres: parse scale %q: %w", parts[1], err)
}
}
case TypeBit:
if err := parseBitParts(parts, c); err != nil {
return nil, err
}
case TypeDouble, TypeFloat8:
c.precision = 53
case TypeReal, TypeFloat4:
c.precision = 24
case TypeTime, TypeTimeTZ, TypeTimestamp, TypeTimestampTZ:
t, p := s, int64(defaultTimePrecision)
// If the second part is only one digit it is the precision argument.
// For cases like "timestamp(4) with time zone" make sure to not drop
// the rest of the type definition.
if len(parts) > 1 && reDigits.MatchString(parts[1]) {
i, err := strconv.ParseInt(parts[1], 10, 64)
if err != nil {
return nil, fmt.Errorf("postgres: parse time precision %q: %w", parts[1], err)
}
p = i
t = strings.Join(append(c.parts[:1], c.parts[2:]...), " ")
}
c.typ = timeAlias(t)
c.timePrecision = &p
case TypeInterval:
matches := reInterval.FindStringSubmatch(s)
c.interval = matches[1]
if matches[2] != "" {
i, err := strconv.ParseInt(matches[2], 10, 64)
if err != nil {
return nil, fmt.Errorf("postgres: parse interval precision %q: %w", parts[1], err)
}
c.timePrecision = &i
}
default:
c.typ = s
}
return c, nil
}
func parseCharParts(parts []string, c *columnDesc) error {
j := strings.Join(parts, " ")
switch {
case strings.HasPrefix(j, TypeVarChar):
c.typ = TypeVarChar
parts = parts[1:]
case strings.HasPrefix(j, TypeCharVar):
c.typ = TypeCharVar
parts = parts[2:]
default:
parts = parts[1:]
}
if len(parts) == 0 {
return nil
}
size, err := strconv.ParseInt(parts[0], 10, 64)
if err != nil {
return fmt.Errorf("postgres: parse size %q: %w", parts[0], err)
}
c.size = size
return nil
}
func parseBitParts(parts []string, c *columnDesc) error {
if len(parts) == 1 {
c.size = 1
return nil
}
parts = parts[1:]
if parts[0] == "varying" {
c.typ = TypeBitVar
parts = parts[1:]
}
if len(parts) == 0 {
return nil
}
size, err := strconv.ParseInt(parts[0], 10, 64)
if err != nil {
return fmt.Errorf("postgres: parse size %q: %w", parts[1], err)
}
c.size = size
return nil
}
// timeAlias returns the abbreviation for the given time type.
func timeAlias(t string) string {
switch t = strings.ToLower(t); t {
// TIMESTAMPTZ be equivalent to TIMESTAMP WITH TIME ZONE.
case TypeTimestampWTZ:
t = TypeTimestampTZ
// TIMESTAMP be equivalent to TIMESTAMP WITHOUT TIME ZONE.
case TypeTimestampWOTZ:
t = TypeTimestamp
// TIME be equivalent to TIME WITHOUT TIME ZONE.
case TypeTimeWOTZ:
t = TypeTime
// TIMETZ be equivalent to TIME WITH TIME ZONE.
case TypeTimeWTZ:
t = TypeTimeTZ
}
return t
}