/
main.go
218 lines (192 loc) · 4.57 KB
/
main.go
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// Tomltestgen is a program that retrieves a given version of
// https://github.com/BurntSushi/toml-test and generates go code for go-toml's unit tests
// based on the test files.
//
// Usage: go run github.com/pepelazz/go-toml/cmd/tomltestgen > toml_testgen_test.go
package main
import (
"archive/zip"
"bytes"
"flag"
"fmt"
"go/format"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"regexp"
"strconv"
"strings"
"text/template"
"time"
)
type invalid struct {
Name string
Input string
}
type valid struct {
Name string
Input string
JsonRef string
}
type testsCollection struct {
Ref string
Timestamp string
Invalid []invalid
Valid []valid
Count int
}
const srcTemplate = "// Generated by tomltestgen for toml-test ref {{.Ref}} on {{.Timestamp}}\n" +
"package toml\n" +
" import (\n" +
" \"testing\"\n" +
")\n" +
"{{range .Invalid}}\n" +
"func TestInvalid{{.Name}}(t *testing.T) {\n" +
" input := {{.Input|gostr}}\n" +
" testgenInvalid(t, input)\n" +
"}\n" +
"{{end}}\n" +
"\n" +
"{{range .Valid}}\n" +
"func TestValid{{.Name}}(t *testing.T) {\n" +
" input := {{.Input|gostr}}\n" +
" jsonRef := {{.JsonRef|gostr}}\n" +
" testgenValid(t, input, jsonRef)\n" +
"}\n" +
"{{end}}\n"
func downloadTmpFile(url string) string {
log.Println("starting to download file from", url)
resp, err := http.Get(url)
if err != nil {
panic(err)
}
defer resp.Body.Close()
tmpfile, err := ioutil.TempFile("", "toml-test-*.zip")
if err != nil {
panic(err)
}
defer tmpfile.Close()
copiedLen, err := io.Copy(tmpfile, resp.Body)
if err != nil {
panic(err)
}
if resp.ContentLength > 0 && copiedLen != resp.ContentLength {
panic(fmt.Errorf("copied %d bytes, request body had %d", copiedLen, resp.ContentLength))
}
return tmpfile.Name()
}
func kebabToCamel(kebab string) string {
camel := ""
nextUpper := true
for _, c := range kebab {
if nextUpper {
camel += strings.ToUpper(string(c))
nextUpper = false
} else if c == '-' {
nextUpper = true
} else {
camel += string(c)
}
}
return camel
}
func readFileFromZip(f *zip.File) string {
reader, err := f.Open()
if err != nil {
panic(err)
}
defer reader.Close()
bytes, err := ioutil.ReadAll(reader)
if err != nil {
panic(err)
}
return string(bytes)
}
func templateGoStr(input string) string {
if len(input) > 0 && input[len(input)-1] == '\n' {
input = input[0 : len(input)-1]
}
if strings.Contains(input, "`") {
lines := strings.Split(input, "\n")
for idx, line := range lines {
lines[idx] = strconv.Quote(line + "\n")
}
return strings.Join(lines, " + \n")
}
return "`" + input + "`"
}
var (
ref = flag.String("r", "master", "git reference")
)
func usage() {
_, _ = fmt.Fprintf(os.Stderr, "usage: tomltestgen [flags]\n")
flag.PrintDefaults()
}
func main() {
flag.Usage = usage
flag.Parse()
url := "https://codeload.github.com/BurntSushi/toml-test/zip/" + *ref
resultFile := downloadTmpFile(url)
defer os.Remove(resultFile)
log.Println("file written to", resultFile)
zipReader, err := zip.OpenReader(resultFile)
if err != nil {
panic(err)
}
defer zipReader.Close()
collection := testsCollection{
Ref: *ref,
Timestamp: time.Now().Format(time.RFC3339),
}
zipFilesMap := map[string]*zip.File{}
for _, f := range zipReader.File {
zipFilesMap[f.Name] = f
}
testFileRegexp := regexp.MustCompile(`([^/]+/tests/(valid|invalid)/(.+))\.(toml)`)
for _, f := range zipReader.File {
groups := testFileRegexp.FindStringSubmatch(f.Name)
if len(groups) > 0 {
name := kebabToCamel(groups[3])
testType := groups[2]
log.Printf("> [%s] %s\n", testType, name)
tomlContent := readFileFromZip(f)
switch testType {
case "invalid":
collection.Invalid = append(collection.Invalid, invalid{
Name: name,
Input: tomlContent,
})
collection.Count++
case "valid":
baseFilePath := groups[1]
jsonFilePath := baseFilePath + ".json"
jsonContent := readFileFromZip(zipFilesMap[jsonFilePath])
collection.Valid = append(collection.Valid, valid{
Name: name,
Input: tomlContent,
JsonRef: jsonContent,
})
collection.Count++
default:
panic(fmt.Sprintf("unknown test type: %s", testType))
}
}
}
log.Printf("Collected %d tests from toml-test\n", collection.Count)
funcMap := template.FuncMap{
"gostr": templateGoStr,
}
t := template.Must(template.New("src").Funcs(funcMap).Parse(srcTemplate))
buf := new(bytes.Buffer)
err = t.Execute(buf, collection)
if err != nil {
panic(err)
}
outputBytes, err := format.Source(buf.Bytes())
if err != nil {
panic(err)
}
fmt.Println(string(outputBytes))
}