96 lines
2.1 KiB
Go
96 lines
2.1 KiB
Go
// Copyright © 2016 Abcum Ltd
|
|
//
|
|
// 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 sql
|
|
|
|
func (p *parser) parseUseStatement() (stmt *UseStatement, err error) {
|
|
|
|
stmt = &UseStatement{}
|
|
|
|
var tok Token
|
|
var exi bool
|
|
|
|
tok, _, err = p.shouldBe(NAMESPACE, NS, DATABASE, DB)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
for {
|
|
|
|
var ok bool
|
|
var lit string
|
|
var val interface{}
|
|
|
|
if p.is(tok, NAMESPACE, NS) {
|
|
|
|
tok, lit, err = p.shouldBe(IDENT, STRING, PARAM)
|
|
if err != nil {
|
|
return nil, &ParseError{Found: lit, Expected: []string{"namespace name"}}
|
|
}
|
|
|
|
switch tok {
|
|
default:
|
|
val, err = p.declare(STRING, lit)
|
|
case PARAM:
|
|
val, err = p.declare(PARAM, lit)
|
|
}
|
|
|
|
if stmt.NS, ok = val.(string); !ok || err != nil {
|
|
return nil, &ParseError{Found: lit, Expected: []string{"namespace name as a STRING"}}
|
|
}
|
|
|
|
if err = p.o.ns(stmt.NS); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
}
|
|
|
|
if p.is(tok, DATABASE, DB) {
|
|
|
|
tok, lit, err = p.shouldBe(IDENT, DATE, TIME, STRING, NUMBER, DOUBLE, PARAM)
|
|
if err != nil {
|
|
return nil, &ParseError{Found: lit, Expected: []string{"database name"}}
|
|
}
|
|
|
|
switch tok {
|
|
default:
|
|
val, err = p.declare(STRING, lit)
|
|
case PARAM:
|
|
val, err = p.declare(PARAM, lit)
|
|
}
|
|
|
|
if stmt.DB, ok = val.(string); !ok || err != nil {
|
|
return nil, &ParseError{Found: lit, Expected: []string{"database name as a STRING"}}
|
|
}
|
|
|
|
if err = p.o.db(stmt.DB); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
}
|
|
|
|
tok, _, exi = p.mightBe(NAMESPACE, NS, DATABASE, DB)
|
|
if !exi {
|
|
break
|
|
}
|
|
|
|
}
|
|
|
|
if _, _, err = p.shouldBe(EOF, SEMICOLON); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return
|
|
|
|
}
|