/
perms.go
112 lines (90 loc) · 1.96 KB
/
perms.go
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// Copyright © 2016 SurrealDB 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) parsePerms() (exp *PermExpression, err error) {
exp = &PermExpression{
Select: false,
Create: false,
Update: false,
Delete: false,
}
tok, _, err := p.shouldBe(FOR, NONE, FULL, WHERE)
if err != nil {
return exp, err
}
if is(tok, NONE, FULL, WHERE) {
var expr Expr
switch tok {
case FULL:
expr = true
case NONE:
expr = false
case WHERE:
if expr, err = p.parseExpr(); err != nil {
return exp, err
}
}
exp.Select = expr
exp.Create = expr
exp.Update = expr
exp.Delete = expr
return
}
if is(tok, FOR) {
for {
var expr Expr
var when []Token
for {
tok, _, err := p.shouldBe(SELECT, CREATE, UPDATE, DELETE)
if err != nil {
return exp, err
}
when = append(when, tok)
if _, _, exi := p.mightBe(COMMA); !exi {
break
}
}
tok, _, err := p.shouldBe(FULL, NONE, WHERE)
if err != nil {
return exp, err
}
switch tok {
case FULL:
expr = true
case NONE:
expr = false
case WHERE:
if expr, err = p.parseExpr(); err != nil {
return exp, err
}
}
for _, w := range when {
switch w {
case SELECT:
exp.Select = expr
case CREATE:
exp.Create = expr
case UPDATE:
exp.Update = expr
case DELETE:
exp.Delete = expr
}
}
if _, _, exi := p.mightBe(FOR); !exi {
break
}
}
}
return
}