112 lines
2 KiB
Go
112 lines
2 KiB
Go
// 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) parsePerms() (exp *PermExpression, err error) {
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exp = &PermExpression{
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Select: false,
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Create: false,
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Update: false,
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Delete: false,
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}
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tok, _, err := p.shouldBe(FOR, NONE, FULL, WHERE)
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if err != nil {
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return exp, err
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}
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if is(tok, NONE, FULL, WHERE) {
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var expr Expr
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switch tok {
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case FULL:
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expr = true
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case NONE:
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expr = false
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case WHERE:
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if expr, err = p.parseExpr(); err != nil {
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return exp, err
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}
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}
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exp.Select = expr
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exp.Create = expr
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exp.Update = expr
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exp.Delete = expr
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return
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}
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if is(tok, FOR) {
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for {
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var expr Expr
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var when []Token
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for {
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tok, _, err := p.shouldBe(SELECT, CREATE, UPDATE, DELETE)
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if err != nil {
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return exp, err
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}
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when = append(when, tok)
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if _, _, exi := p.mightBe(COMMA); !exi {
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break
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}
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}
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tok, _, err := p.shouldBe(FULL, NONE, WHERE)
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if err != nil {
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return exp, err
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}
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switch tok {
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case FULL:
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expr = true
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case NONE:
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expr = false
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case WHERE:
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if expr, err = p.parseExpr(); err != nil {
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return exp, err
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}
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}
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for _, w := range when {
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switch w {
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case SELECT:
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exp.Select = expr
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case CREATE:
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exp.Create = expr
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case UPDATE:
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exp.Update = expr
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case DELETE:
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exp.Delete = expr
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}
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}
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if _, _, exi := p.mightBe(FOR); !exi {
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break
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}
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}
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}
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return
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}
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