mirror of
https://gitee.com/milvus-io/milvus.git
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114 lines
2.8 KiB
Go
114 lines
2.8 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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 autoindex
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import (
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"fmt"
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"strconv"
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"strings"
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"go/ast"
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"go/parser"
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//"encoding/json"
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"github.com/milvus-io/milvus-proto/go-api/commonpb"
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"github.com/milvus-io/milvus/internal/util/funcutil"
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)
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const (
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VariablePrefix = "__"
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)
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type identVisitor struct {
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input string
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valid bool
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}
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func (v *identVisitor) Visit(n ast.Node) ast.Visitor {
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if n == nil {
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return nil
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}
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switch d := n.(type) {
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case *ast.Ident:
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if strings.HasPrefix(d.Name, VariablePrefix) {
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if v.valid {
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if v.input != d.Name {
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v.valid = false
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return nil
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}
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} else {
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v.input = d.Name
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v.valid = true
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}
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}
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}
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return v
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}
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func parseIdentFromExpr(expression string) (string, error) {
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expr, err := parser.ParseExpr(expression)
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if err != nil {
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return "", fmt.Errorf("parse input from expression failed: %v", err)
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}
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var x identVisitor
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ast.Walk(&x, expr)
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if !x.valid {
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return "", fmt.Errorf("parse input from expression failed: number of input variable should be 1")
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}
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return x.input, nil
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}
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func parseAssignment(stmt string) (input string, output string, expr string, err error) {
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defer func() {
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if err != nil {
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input = ""
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output = ""
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expr = ""
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}
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}()
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exprs := strings.Split(stmt, "=")
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if len(exprs) != 2 {
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err = fmt.Errorf("parse assignment stmt failed, wrong format")
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return
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}
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output, err = parseIdentFromExpr(exprs[0])
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if err != nil {
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err = fmt.Errorf("parse assignment stmt failed, wrong lvalue format:%w", err)
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return
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}
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expr = exprs[1]
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input, err = parseIdentFromExpr(expr)
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if err != nil {
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err = fmt.Errorf("parse assignment stmt failed, wrong rvalue format:%w", err)
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return
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}
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return
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}
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func getInt64FromParams(params []*commonpb.KeyValuePair, key string) (int64, error) {
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valueStr, err := funcutil.GetAttrByKeyFromRepeatedKV(key, params)
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if err != nil {
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return 0, fmt.Errorf("%s not found in search_params", key)
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}
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value, err := strconv.ParseInt(valueStr, 0, 64)
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if err != nil {
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return 0, fmt.Errorf("%s [%s] is invalid", key, valueStr)
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}
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return value, nil
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}
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