mirror of
https://github.com/minio/minio.git
synced 2025-10-31 08:11:19 +01:00
135 lines
3.6 KiB
Go
135 lines
3.6 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
|
|
//
|
|
// This file is part of MinIO Object Storage stack
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package sql
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
)
|
|
|
|
// String functions
|
|
|
|
// String - returns the JSONPath representation
|
|
func (e *JSONPath) String() string {
|
|
if len(e.pathString) == 0 {
|
|
parts := make([]string, len(e.PathExpr)+1)
|
|
parts[0] = e.BaseKey.String()
|
|
for i, pe := range e.PathExpr {
|
|
parts[i+1] = pe.String()
|
|
}
|
|
e.pathString = strings.Join(parts, "")
|
|
}
|
|
return e.pathString
|
|
}
|
|
|
|
// StripTableAlias removes a table alias from the path. The result is also
|
|
// cached for repeated lookups during SQL query evaluation.
|
|
func (e *JSONPath) StripTableAlias(tableAlias string) []*JSONPathElement {
|
|
if e.strippedTableAlias == tableAlias {
|
|
return e.strippedPathExpr
|
|
}
|
|
|
|
hasTableAlias := e.BaseKey.String() == tableAlias || strings.EqualFold(e.BaseKey.String(), baseTableName)
|
|
var pathExpr []*JSONPathElement
|
|
if hasTableAlias {
|
|
pathExpr = e.PathExpr
|
|
} else {
|
|
pathExpr = make([]*JSONPathElement, len(e.PathExpr)+1)
|
|
pathExpr[0] = &JSONPathElement{Key: &ObjectKey{ID: e.BaseKey}}
|
|
copy(pathExpr[1:], e.PathExpr)
|
|
}
|
|
e.strippedTableAlias = tableAlias
|
|
e.strippedPathExpr = pathExpr
|
|
return e.strippedPathExpr
|
|
}
|
|
|
|
func (e *JSONPathElement) String() string {
|
|
switch {
|
|
case e.Key != nil:
|
|
return e.Key.String()
|
|
case e.Index != nil:
|
|
return fmt.Sprintf("[%d]", *e.Index)
|
|
case e.ObjectWildcard:
|
|
return ".*"
|
|
case e.ArrayWildcard:
|
|
return "[*]"
|
|
}
|
|
return ""
|
|
}
|
|
|
|
// String removes double quotes in quoted identifiers
|
|
func (i *Identifier) String() string {
|
|
if i.Unquoted != nil {
|
|
return *i.Unquoted
|
|
}
|
|
return string(*i.Quoted)
|
|
}
|
|
|
|
func (o *ObjectKey) String() string {
|
|
if o.Lit != nil {
|
|
return fmt.Sprintf("['%s']", string(*o.Lit))
|
|
}
|
|
return fmt.Sprintf(".%s", o.ID.String())
|
|
}
|
|
|
|
func (o *ObjectKey) keyString() string {
|
|
if o.Lit != nil {
|
|
return string(*o.Lit)
|
|
}
|
|
return o.ID.String()
|
|
}
|
|
|
|
// getLastKeypathComponent checks if the given expression is a path
|
|
// expression, and if so extracts the last dot separated component of
|
|
// the path. Otherwise it returns false.
|
|
func getLastKeypathComponent(e *Expression) (string, bool) {
|
|
if len(e.And) > 1 ||
|
|
len(e.And[0].Condition) > 1 ||
|
|
e.And[0].Condition[0].Not != nil ||
|
|
e.And[0].Condition[0].Operand.ConditionRHS != nil {
|
|
return "", false
|
|
}
|
|
|
|
operand := e.And[0].Condition[0].Operand.Operand
|
|
if operand.Right != nil ||
|
|
operand.Left.Right != nil ||
|
|
operand.Left.Left.Negated != nil ||
|
|
operand.Left.Left.Primary.JPathExpr == nil {
|
|
return "", false
|
|
}
|
|
|
|
// Check if path expression ends in a key
|
|
jpath := operand.Left.Left.Primary.JPathExpr
|
|
n := len(jpath.PathExpr)
|
|
if n > 0 && jpath.PathExpr[n-1].Key == nil {
|
|
return "", false
|
|
}
|
|
ps := jpath.String()
|
|
if idx := strings.LastIndex(ps, "."); idx >= 0 {
|
|
// Get last part of path string.
|
|
ps = ps[idx+1:]
|
|
}
|
|
return ps, true
|
|
}
|
|
|
|
// HasKeypath returns if the from clause has a key path -
|
|
// e.g. S3object[*].id
|
|
func (from *TableExpression) HasKeypath() bool {
|
|
return len(from.Table.PathExpr) > 1
|
|
}
|