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2786055df4
- New parser written from scratch, allows easier and complete parsing of the full S3 Select SQL syntax. Parser definition is directly provided by the AST defined for the SQL grammar. - Bring support to parse and interpret SQL involving JSON path expressions; evaluation of JSON path expressions will be subsequently added. - Bring automatic type inference and conversion for untyped values (e.g. CSV data).
88 lines
2.2 KiB
Go
88 lines
2.2 KiB
Go
/*
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* Minio Cloud Storage, (C) 2019 Minio, Inc.
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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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*/
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package sql
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import (
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"fmt"
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"strings"
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)
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// String functions
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// String - returns the JSONPath representation
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func (e *JSONPath) String() string {
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parts := make([]string, len(e.PathExpr)+1)
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parts[0] = e.BaseKey.String()
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for i, pe := range e.PathExpr {
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parts[i+1] = pe.String()
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}
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return strings.Join(parts, "")
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}
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func (e *JSONPathElement) String() string {
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switch {
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case e.Key != nil:
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return e.Key.String()
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case e.Index != nil:
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return fmt.Sprintf("[%d]", *e.Index)
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case e.ObjectWildcard:
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return ".*"
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case e.ArrayWildcard:
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return "[*]"
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}
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return ""
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}
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// Removes double quotes in quoted identifiers
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func (i *Identifier) String() string {
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if i.Unquoted != nil {
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return *i.Unquoted
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}
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return string(*i.Quoted)
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}
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func (o *ObjectKey) String() string {
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if o.Lit != nil {
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return fmt.Sprintf("['%s']", string(*o.Lit))
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}
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return fmt.Sprintf(".%s", o.ID.String())
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}
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// getLastKeypathComponent checks if the given expression is a path
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// expression, and if so extracts the last dot separated component of
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// the path. Otherwise it returns false.
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func getLastKeypathComponent(e *Expression) (string, bool) {
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if len(e.And) > 1 ||
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len(e.And[0].Condition) > 1 ||
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e.And[0].Condition[0].Not != nil ||
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e.And[0].Condition[0].Operand.ConditionRHS != nil {
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return "", false
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}
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operand := e.And[0].Condition[0].Operand.Operand
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if operand.Right != nil ||
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operand.Left.Right != nil ||
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operand.Left.Left.Negated != nil ||
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operand.Left.Left.Primary.JPathExpr == nil {
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return "", false
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}
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keypath := operand.Left.Left.Primary.JPathExpr.String()
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ps := strings.Split(keypath, ".")
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return ps[len(ps)-1], true
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}
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