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ast.go
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ast.go
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package internal
import (
"reflect"
"strconv"
"time"
"cloud.google.com/go/civil"
"cloud.google.com/go/spanner"
"github.com/MakeNowJust/memefish/pkg/ast"
"github.com/pkg/errors"
)
// ASTExpr is a type that can be converted into ast.Expr.
type ASTExpr interface {
ToASTExpr() (ast.Expr, error)
}
func ToExpr(val interface{}) (ast.Expr, error) {
switch v := val.(type) {
case nil:
return NullLit(), nil
case string:
return StringLit(v), nil
case *string:
if v == nil {
return NullLit(), nil
}
return StringLit(*v), nil
case spanner.NullString:
if !v.Valid {
return NullLit(), nil
}
return StringLit(v.StringVal), nil
case []byte:
if v == nil {
return NullLit(), nil
}
return BytesLit(v), nil
case int:
return IntLit(int64(v)), nil
case *int:
if v == nil {
return NullLit(), nil
}
return IntLit(int64(*v)), nil
case int64:
return IntLit(v), nil
case *int64:
if v == nil {
return NullLit(), nil
}
return IntLit(*v), nil
case spanner.NullInt64:
if !v.Valid {
return NullLit(), nil
}
return IntLit(v.Int64), nil
case bool:
return BoolLit(v), nil
case *bool:
if v == nil {
return NullLit(), nil
}
return BoolLit(*v), nil
case spanner.NullBool:
if !v.Valid {
return NullLit(), nil
}
return BoolLit(v.Bool), nil
case float64:
return FloatLit(v), nil
case *float64:
if v == nil {
return NullLit(), nil
}
return FloatLit(*v), nil
case spanner.NullFloat64:
if !v.Valid {
return NullLit(), nil
}
return FloatLit(v.Float64), nil
case time.Time:
return TimeLit(v), nil
case *time.Time:
if v == nil {
return NullLit(), nil
}
return TimeLit(*v), nil
case spanner.NullTime:
if !v.Valid {
return NullLit(), nil
}
return TimeLit(v.Time), nil
case civil.Date:
return DateLit(v), nil
case *civil.Date:
if v == nil {
return NullLit(), nil
}
return DateLit(*v), nil
case spanner.NullDate:
if !v.Valid {
return NullLit(), nil
}
return DateLit(v.Date), nil
default:
if se, ok := val.(ASTExpr); ok {
return se.ToASTExpr()
}
// TODO: support big.Rat
// Slices
valV := reflect.ValueOf(val)
if valV.Type().Kind() == reflect.Slice {
exprs := make([]ast.Expr, 0, valV.Len())
for i := 0; i < valV.Len(); i++ {
vi := valV.Index(i).Interface()
ei, err := ToExpr(vi)
if err != nil {
return nil, errors.WithMessagef(err, "at index %d", i)
}
exprs = append(exprs, ei)
}
return ArrayLit(exprs), nil
} else {
return nil, errors.Errorf("can't convert %T into SQL expr", val)
}
}
}
func StringLit(v string) *ast.StringLiteral {
return &ast.StringLiteral{
Value: v,
}
}
func BytesLit(v []byte) *ast.BytesLiteral {
return &ast.BytesLiteral{
Value: v,
}
}
func IntLit(v int64) *ast.IntLiteral {
return &ast.IntLiteral{
Base: 10,
Value: strconv.FormatInt(v, 10),
}
}
func BoolLit(v bool) *ast.BoolLiteral {
return &ast.BoolLiteral{
Value: v,
}
}
func FloatLit(v float64) *ast.FloatLiteral {
return &ast.FloatLiteral{
Value: strconv.FormatFloat(v, 'e', -1, 64),
}
}
func TimeLit(v time.Time) *ast.TimestampLiteral {
return &ast.TimestampLiteral{
Value: &ast.StringLiteral{
Value: v.Format(time.RFC3339Nano),
},
}
}
func DateLit(v civil.Date) *ast.DateLiteral {
return &ast.DateLiteral{
Value: &ast.StringLiteral{
Value: v.String(),
},
}
}
func ArrayLit(exprs []ast.Expr) *ast.ArrayLiteral {
return &ast.ArrayLiteral{
Values: exprs,
}
}
func NullLit() *ast.NullLiteral {
return &ast.NullLiteral{}
}