91 lines
1.9 KiB
Go
91 lines
1.9 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) parseIfelseStatement() (stmt *IfelseStatement, err error) {
|
|
|
|
grw := p.buf.rw
|
|
|
|
p.buf.rw = false
|
|
|
|
defer func() {
|
|
p.buf.rw = grw
|
|
}()
|
|
|
|
stmt = &IfelseStatement{}
|
|
|
|
for {
|
|
|
|
var tok Token
|
|
|
|
if cond, err := p.parseExpr(); err != nil {
|
|
return nil, err
|
|
} else {
|
|
stmt.Cond = append(stmt.Cond, cond)
|
|
}
|
|
|
|
if _, _, err = p.shouldBe(THEN); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if then, err := p.parseExpr(); err != nil {
|
|
return nil, err
|
|
} else {
|
|
stmt.Then = append(stmt.Then, then)
|
|
}
|
|
|
|
// Check to see if the next token is an
|
|
// ELSE keyword and if it is then check to
|
|
// see if there is another if statement.
|
|
|
|
if tok, _, err = p.shouldBe(ELSE, END); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if tok == END {
|
|
return
|
|
}
|
|
|
|
if tok == ELSE {
|
|
if _, _, exi := p.mightBe(IF); !exi {
|
|
break
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
// Check to see if the next token is an
|
|
// ELSE keyword and if it is then check to
|
|
// see if there is another if statement.
|
|
|
|
if then, err := p.parseExpr(); err != nil {
|
|
return nil, err
|
|
} else {
|
|
stmt.Else = then
|
|
}
|
|
|
|
if _, _, err = p.shouldBe(END); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// If this query has any subqueries which
|
|
// need to alter the database then mark
|
|
// this query as a writeable statement.
|
|
|
|
stmt.RW = p.buf.rw
|
|
|
|
return
|
|
|
|
}
|