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