mirror of https://github.com/tidwall/tile38.git
97 lines
2.1 KiB
Go
97 lines
2.1 KiB
Go
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/*Basic command line interface for debug and testing purposes.
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Examples:
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Only print the AST for the expression:
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jp.go -ast "foo.bar.baz"
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Evaluate the JMESPath expression against JSON data from a file:
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jp.go -input /tmp/data.json "foo.bar.baz"
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This program can also be used as an executable to the jp-compliance
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runner (github.com/jmespath/jmespath.test).
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*/
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package main
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import (
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"flag"
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"fmt"
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"io/ioutil"
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"os"
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)
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import (
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"encoding/json"
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"github.com/jmespath/go-jmespath"
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)
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func errMsg(msg string, a ...interface{}) int {
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fmt.Fprintf(os.Stderr, msg, a...)
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fmt.Fprintln(os.Stderr)
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return 1
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}
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func run() int {
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astOnly := flag.Bool("ast", false, "Print the AST for the input expression and exit.")
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inputFile := flag.String("input", "", "Filename containing JSON data to search. If not provided, data is read from stdin.")
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flag.Parse()
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args := flag.Args()
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if len(args) != 1 {
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fmt.Fprintf(os.Stderr, "Usage:\n\n")
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flag.PrintDefaults()
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return errMsg("\nError: expected a single argument (the JMESPath expression).")
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}
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expression := args[0]
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parser := jmespath.NewParser()
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parsed, err := parser.Parse(expression)
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if err != nil {
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if syntaxError, ok := err.(jmespath.SyntaxError); ok {
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return errMsg("%s\n%s\n", syntaxError, syntaxError.HighlightLocation())
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}
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return errMsg("%s", err)
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}
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if *astOnly {
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fmt.Println("")
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fmt.Printf("%s\n", parsed)
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return 0
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}
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var inputData []byte
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if *inputFile != "" {
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inputData, err = ioutil.ReadFile(*inputFile)
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if err != nil {
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return errMsg("Error loading file %s: %s", *inputFile, err)
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}
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} else {
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// If an input data file is not provided then we read the
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// data from stdin.
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inputData, err = ioutil.ReadAll(os.Stdin)
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if err != nil {
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return errMsg("Error reading from stdin: %s", err)
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}
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}
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var data interface{}
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json.Unmarshal(inputData, &data)
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result, err := jmespath.Search(expression, data)
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if err != nil {
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return errMsg("Error executing expression: %s", err)
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}
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toJSON, err := json.MarshalIndent(result, "", " ")
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if err != nil {
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return errMsg("Error serializing result to JSON: %s", err)
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}
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fmt.Println(string(toJSON))
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return 0
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}
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func main() {
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os.Exit(run())
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}
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