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json_quote.go
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json_quote.go
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// Copyright 2024 Dolthub, 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,
// 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.
package json
import (
"fmt"
"reflect"
"github.com/dolthub/go-mysql-server/internal/strings"
"github.com/dolthub/go-mysql-server/sql"
"github.com/dolthub/go-mysql-server/sql/expression"
"github.com/dolthub/go-mysql-server/sql/types"
)
// JSONQuote (string)
//
// JSONQuote Quotes a string as a JSON value by wrapping it with double quote characters and escaping interior quote and
// other characters, then returning the result as a utf8mb4 string. Returns NULL if the argument is NULL. This function
// is typically used to produce a valid JSON string literal for inclusion within a JSON document. Certain special
// characters are escaped with backslashes per the escape sequences shown in Table 12.23, “JSON_UNQUOTE() Special
// Character Escape Sequences”:
// https://dev.mysql.com/doc/refman/8.0/en/json-modification-functions.html#json-unquote-character-escape-sequences
//
// https://dev.mysql.com/doc/refman/8.0/en/json-creation-functions.html#function_json-quote
type JSONQuote struct {
expression.UnaryExpression
}
var _ sql.FunctionExpression = (*JSONQuote)(nil)
var _ sql.CollationCoercible = (*JSONQuote)(nil)
// NewJSONQuote creates a new JSONQuote UDF.
func NewJSONQuote(json sql.Expression) sql.Expression {
return &JSONQuote{expression.UnaryExpression{Child: json}}
}
// FunctionName implements sql.FunctionExpression
func (js *JSONQuote) FunctionName() string {
return "json_quote"
}
// Description implements sql.FunctionExpression
func (js *JSONQuote) Description() string {
return "quotes a string as a JSON value and returns the result as a utf8mb4 string."
}
// String implements the fmt.Stringer interface.
func (js *JSONQuote) String() string {
return fmt.Sprintf("%s(%s)", js.FunctionName(), js.Child)
}
// Type implements the Expression interface.
func (*JSONQuote) Type() sql.Type {
return types.LongText
}
// CollationCoercibility implements the interface sql.CollationCoercible.
func (*JSONQuote) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
return ctx.GetCharacterSet().BinaryCollation(), 4
}
// WithChildren implements the Expression interface.
func (js *JSONQuote) WithChildren(children ...sql.Expression) (sql.Expression, error) {
if len(children) != 1 {
return nil, sql.ErrInvalidChildrenNumber.New(js, len(children), 1)
}
return NewJSONQuote(children[0]), nil
}
// Eval implements the Expression interface.
func (js *JSONQuote) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
typ := js.Child.Type()
if typ != types.Null && !types.IsText(typ) {
return nil, sql.ErrInvalidType.New(typ)
}
val, err := js.Child.Eval(ctx, row)
if val == nil || err != nil {
return val, err
}
ex, _, err := types.LongText.Convert(val)
if err != nil {
return nil, err
}
if ex == nil {
return nil, nil
}
str, ok := ex.(string)
if !ok {
return nil, sql.ErrInvalidType.New(reflect.TypeOf(ex).String())
}
return strings.Quote(str), nil
}