/
select.go
312 lines (267 loc) · 7.31 KB
/
select.go
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package mconf
import (
"bytes"
"errors"
"fmt"
"io"
"reflect"
"strconv"
"strings"
"github.com/tomwright/dasel"
)
type selectOptions struct {
File string
Parser string
ReadParser string
WriteParser string
Selector string
Reader io.Reader
Writer io.Writer
Multi bool
NullValueNotFound bool
Compact bool
DisplayLength bool
MergeInputDocuments bool
FormatTemplate string
Colourise bool
EscapeHTML bool
}
type customErrorHandlingOpts struct {
File string
Out string
Writer io.Writer
Err error
NullFlag bool
}
func writeStringToOutput(value string, file string, out string, writer io.Writer) error {
writer, writerCleanUp, err := getOutputWriter(writer, file, out)
if err != nil {
return err
}
defer writerCleanUp()
if _, err := writer.Write([]byte(value)); err != nil {
return fmt.Errorf("could not write to output file: %w", err)
}
return nil
}
func customErrorHandling(opts customErrorHandlingOpts) (bool, error) {
if opts.Err == nil {
return false, nil
}
if !opts.NullFlag {
return false, opts.Err
}
var valNotFound *dasel.ValueNotFound
if !errors.As(opts.Err, &valNotFound) {
return false, opts.Err
}
if err := writeStringToOutput("null\n", opts.File, opts.Out, opts.Writer); err != nil {
return false, fmt.Errorf("could not write string to output: %w", err)
}
return true, nil
}
func outputNodeLength(writer io.Writer, nodes ...*dasel.Node) error {
for _, n := range nodes {
val := n.Value
if val.Kind() == reflect.Interface {
val = val.Elem()
}
length := 0
switch val.Kind() {
case reflect.Map, reflect.Slice, reflect.String:
length = val.Len()
default:
length = len(fmt.Sprint(val.Interface()))
}
if _, err := fmt.Fprintf(writer, "%d\n", length); err != nil {
return err
}
}
return nil
}
type writeNodesToOutputOpts struct {
Nodes []*dasel.Node
Parser WriteParser
File string
Out string
Writer io.Writer
FormatTemplate string
}
func writeNodesToOutput(opts writeNodesToOutputOpts, options ...ReadWriteOption) error {
writer, writerCleanUp, err := getOutputWriter( /*cmd, */ opts.Writer, opts.File, opts.Out)
if err != nil {
return err
}
opts.Writer = writer
defer writerCleanUp()
buf := new(bytes.Buffer)
for i, n := range opts.Nodes {
subOpts := writeNodeToOutputOpts{
Node: n,
Parser: opts.Parser,
Writer: buf,
FormatTemplate: opts.FormatTemplate,
}
if err := writeNodeToOutput(subOpts, options...); err != nil {
return fmt.Errorf("could not write node %d to output: %w", i, err)
}
}
if _, err := io.Copy(opts.Writer, buf); err != nil {
return fmt.Errorf("could not copy buffer to real output: %w", err)
}
return nil
}
func runSelectMultiCommand(rootNode *dasel.Node, opts selectOptions, writeParser WriteParser, writeOptions []ReadWriteOption) error {
var results []*dasel.Node
var err error
if opts.Selector == "." {
results = []*dasel.Node{rootNode}
} else {
results, err = rootNode.QueryMultiple(opts.Selector)
}
written, err := customErrorHandling(customErrorHandlingOpts{
File: opts.File,
Writer: opts.Writer,
Err: err,
NullFlag: opts.NullValueNotFound,
})
if err != nil {
return fmt.Errorf("could not query multiple node: %w", err)
}
if written {
return nil
}
if opts.DisplayLength {
return outputNodeLength(opts.Writer, results...)
}
if err := writeNodesToOutput(writeNodesToOutputOpts{
Nodes: results,
Parser: writeParser,
Writer: opts.Writer,
FormatTemplate: opts.FormatTemplate,
}, writeOptions...); err != nil {
return fmt.Errorf("could not write output: %w", err)
}
return nil
}
func runSelectCommand(opts selectOptions) error {
readParser, err := getReadParser(opts.File, opts.ReadParser, opts.Parser)
if err != nil {
return err
}
rootNode, err := getRootNode(getRootNodeOpts{
File: opts.File,
Parser: readParser,
Reader: opts.Reader,
MergeInputDocuments: opts.MergeInputDocuments,
})
if err != nil {
return err
}
if !rootNode.Value.IsValid() {
rootNode = dasel.New(&BasicSingleDocument{
Value: map[string]interface{}{},
})
}
writeParser, err := getWriteParser(readParser, opts.WriteParser, opts.Parser, "-", opts.File, opts.FormatTemplate)
if err != nil {
return err
}
writeOptions := []ReadWriteOption{
EscapeHTMLOption(opts.EscapeHTML),
}
if opts.Compact {
writeOptions = append(writeOptions, PrettyPrintOption(false))
}
if opts.Colourise {
writeOptions = append(writeOptions, ColouriseOption(true))
}
if opts.Multi {
return runSelectMultiCommand(rootNode, opts, writeParser, writeOptions)
}
var res *dasel.Node
if opts.Selector == "." {
res = rootNode
} else {
res, err = rootNode.Query(opts.Selector)
if err != nil {
err = fmt.Errorf("could not query node: %w", err)
}
}
written, err := customErrorHandling(customErrorHandlingOpts{
File: opts.File,
Writer: opts.Writer,
Err: err,
NullFlag: opts.NullValueNotFound,
})
if err != nil {
return err
}
if written {
return nil
}
if opts.DisplayLength {
return outputNodeLength(opts.Writer, res)
}
if err := writeNodeToOutput(writeNodeToOutputOpts{
Node: res,
Parser: writeParser,
Writer: opts.Writer,
FormatTemplate: opts.FormatTemplate,
}, writeOptions...); err != nil {
return fmt.Errorf("could not write output: %w", err)
}
return nil
}
// Find 查询字段值,select表示选择字段,inFormat输入数据解析格式yaml、json 、toml,outFormat输出数据解析格式yaml、json 、toml,输出格式可以和输入格式不一致
func Find(in []byte, selector string, inFormat string, outFormat string) ([]byte, error) {
outputBuffer := bytes.NewBuffer([]byte{})
err := runSelectCommand(selectOptions{
Parser: inFormat,
WriteParser: outFormat,
Selector: selector,
Reader: bytes.NewReader(in),
Writer: outputBuffer,
Multi: true,
})
if err != nil {
return nil, err
}
output, err := io.ReadAll(outputBuffer)
if err != nil {
return nil, err
}
return output, nil
}
// FindYaml 查询yaml文档字段值,select表示选择字段,输入输出都是yaml格式
func FindYaml(in []byte, selector string) ([]byte, error) {
return Find(in, selector, YamlFormat, YamlFormat)
}
// FindJSON 查询json文档字段值,select表示选择字段,输入输出都是json格式
func FindJSON(in []byte, selector string) ([]byte, error) {
return Find(in, selector, JSONFormat, JSONFormat)
}
// Count 计算查询字段值数量,inFormat输入数据解析格式yaml、json 、toml,outFormat输出数据解析格式yaml、json 、toml
func Count(in []byte, selector string, inFormat string) (int, error) {
outputBuffer := bytes.NewBuffer([]byte{})
err := runSelectCommand(selectOptions{
Parser: inFormat,
Selector: selector,
Reader: bytes.NewReader(in),
Writer: outputBuffer,
Multi: true,
DisplayLength: true,
})
if err != nil {
return 0, err
}
output, err := io.ReadAll(outputBuffer)
if err != nil {
return 0, err
}
n, err := strconv.Atoi(strings.Replace(string(output), "\n", "", -1))
if err != nil {
return 0, err
}
return n, nil
}