2016-05-23 12:32:02 +00:00
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// Copyright © 2016 Abcum Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package sql
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2016-09-20 23:34:21 +00:00
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func (p *parser) parseUseStatement() (stmt *UseStatement, err error) {
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2016-05-23 12:32:02 +00:00
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stmt = &UseStatement{}
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var tok Token
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var exi bool
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2017-02-20 01:18:34 +00:00
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tok, _, err = p.shouldBe(NAMESPACE, NS, DATABASE, DB)
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2016-05-23 12:32:02 +00:00
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if err != nil {
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return nil, err
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}
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for {
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2017-02-20 01:18:34 +00:00
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var ok bool
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var lit string
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var val interface{}
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2016-11-04 11:25:53 +00:00
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2017-02-20 01:18:34 +00:00
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if p.is(tok, NAMESPACE, NS) {
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tok, lit, err = p.shouldBe(IDENT, STRING, PARAM)
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2016-05-23 12:32:02 +00:00
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if err != nil {
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2017-02-20 01:18:34 +00:00
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return nil, &ParseError{Found: lit, Expected: []string{"namespace name"}}
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}
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switch tok {
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default:
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val, err = p.declare(STRING, lit)
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case PARAM:
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val, err = p.declare(PARAM, lit)
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}
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if stmt.NS, ok = val.(string); !ok || err != nil {
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return nil, &ParseError{Found: lit, Expected: []string{"namespace name as a STRING"}}
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2016-05-23 12:32:02 +00:00
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}
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2016-11-04 11:25:53 +00:00
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if err = p.o.ns(stmt.NS); err != nil {
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return nil, err
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}
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2016-05-23 12:32:02 +00:00
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}
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2017-02-20 01:18:34 +00:00
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if p.is(tok, DATABASE, DB) {
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2016-11-04 11:25:53 +00:00
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2017-02-20 01:18:34 +00:00
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tok, lit, err = p.shouldBe(IDENT, DATE, TIME, STRING, NUMBER, DOUBLE, PARAM)
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2016-05-23 12:32:02 +00:00
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if err != nil {
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2017-02-20 01:18:34 +00:00
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return nil, &ParseError{Found: lit, Expected: []string{"database name"}}
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}
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switch tok {
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default:
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val, err = p.declare(STRING, lit)
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case PARAM:
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val, err = p.declare(PARAM, lit)
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}
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if stmt.DB, ok = val.(string); !ok || err != nil {
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return nil, &ParseError{Found: lit, Expected: []string{"database name as a STRING"}}
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2016-05-23 12:32:02 +00:00
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}
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2016-11-04 11:25:53 +00:00
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if err = p.o.db(stmt.DB); err != nil {
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return nil, err
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}
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2016-05-23 12:32:02 +00:00
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}
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2017-02-20 01:18:34 +00:00
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tok, _, exi = p.mightBe(NAMESPACE, NS, DATABASE, DB)
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2016-05-23 12:32:02 +00:00
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if !exi {
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break
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}
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}
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if _, _, err = p.shouldBe(EOF, SEMICOLON); err != nil {
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return nil, err
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}
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return
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}
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