TUN-4961: Update quic-go to latest

- Updates fips-go to be the latest on cfsetup.yaml
- Updates sumtype's x/tools to be latest to avoid Internal: nil pkg
  errors with fips.

vendor/github.com/cheekybits/genny/parse/parse.go

@@ -0,0 +1,298 @@
+package parse
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"go/ast"
+	"go/parser"
+	"go/scanner"
+	"go/token"
+	"io"
+	"os"
+	"strings"
+	"unicode"
+
+	"golang.org/x/tools/imports"
+)
+
+var header = []byte(`
+
+// This file was automatically generated by genny.
+// Any changes will be lost if this file is regenerated.
+// see https://github.com/cheekybits/genny
+
+`)
+
+var (
+	packageKeyword = []byte("package")
+	importKeyword  = []byte("import")
+	openBrace      = []byte("(")
+	closeBrace     = []byte(")")
+	genericPackage = "generic"
+	genericType    = "generic.Type"
+	genericNumber  = "generic.Number"
+	linefeed       = "\r\n"
+)
+var unwantedLinePrefixes = [][]byte{
+	[]byte("//go:generate genny "),
+}
+
+func subIntoLiteral(lit, typeTemplate, specificType string) string {
+	if lit == typeTemplate {
+		return specificType
+	}
+	if !strings.Contains(lit, typeTemplate) {
+		return lit
+	}
+	specificLg := wordify(specificType, true)
+	specificSm := wordify(specificType, false)
+	result := strings.Replace(lit, typeTemplate, specificLg, -1)
+	if strings.HasPrefix(result, specificLg) && !isExported(lit) {
+		return strings.Replace(result, specificLg, specificSm, 1)
+	}
+	return result
+}
+
+func subTypeIntoComment(line, typeTemplate, specificType string) string {
+	var subbed string
+	for _, w := range strings.Fields(line) {
+		subbed = subbed + subIntoLiteral(w, typeTemplate, specificType) + " "
+	}
+	return subbed
+}
+
+// Does the heavy lifting of taking a line of our code and
+// sbustituting a type into there for our generic type
+func subTypeIntoLine(line, typeTemplate, specificType string) string {
+	src := []byte(line)
+	var s scanner.Scanner
+	fset := token.NewFileSet()
+	file := fset.AddFile("", fset.Base(), len(src))
+	s.Init(file, src, nil, scanner.ScanComments)
+	output := ""
+	for {
+		_, tok, lit := s.Scan()
+		if tok == token.EOF {
+			break
+		} else if tok == token.COMMENT {
+			subbed := subTypeIntoComment(lit, typeTemplate, specificType)
+			output = output + subbed + " "
+		} else if tok.IsLiteral() {
+			subbed := subIntoLiteral(lit, typeTemplate, specificType)
+			output = output + subbed + " "
+		} else {
+			output = output + tok.String() + " "
+		}
+	}
+	return output
+}
+
+// typeSet looks like "KeyType: int, ValueType: string"
+func generateSpecific(filename string, in io.ReadSeeker, typeSet map[string]string) ([]byte, error) {
+
+	// ensure we are at the beginning of the file
+	in.Seek(0, os.SEEK_SET)
+
+	// parse the source file
+	fs := token.NewFileSet()
+	file, err := parser.ParseFile(fs, filename, in, 0)
+	if err != nil {
+		return nil, &errSource{Err: err}
+	}
+
+	// make sure every generic.Type is represented in the types
+	// argument.
+	for _, decl := range file.Decls {
+		switch it := decl.(type) {
+		case *ast.GenDecl:
+			for _, spec := range it.Specs {
+				ts, ok := spec.(*ast.TypeSpec)
+				if !ok {
+					continue
+				}
+				switch tt := ts.Type.(type) {
+				case *ast.SelectorExpr:
+					if name, ok := tt.X.(*ast.Ident); ok {
+						if name.Name == genericPackage {
+							if _, ok := typeSet[ts.Name.Name]; !ok {
+								return nil, &errMissingSpecificType{GenericType: ts.Name.Name}
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+
+	in.Seek(0, os.SEEK_SET)
+
+	var buf bytes.Buffer
+
+	comment := ""
+	scanner := bufio.NewScanner(in)
+	for scanner.Scan() {
+
+		line := scanner.Text()
+
+		// does this line contain generic.Type?
+		if strings.Contains(line, genericType) || strings.Contains(line, genericNumber) {
+			comment = ""
+			continue
+		}
+
+		for t, specificType := range typeSet {
+			if strings.Contains(line, t) {
+				newLine := subTypeIntoLine(line, t, specificType)
+				line = newLine
+			}
+		}
+
+		if comment != "" {
+			buf.WriteString(makeLine(comment))
+			comment = ""
+		}
+
+		// is this line a comment?
+		// TODO: should we handle /* */ comments?
+		if strings.HasPrefix(line, "//") {
+			// record this line to print later
+			comment = line
+			continue
+		}
+
+		// write the line
+		buf.WriteString(makeLine(line))
+	}
+
+	// write it out
+	return buf.Bytes(), nil
+}
+
+// Generics parses the source file and generates the bytes replacing the
+// generic types for the keys map with the specific types (its value).
+func Generics(filename, pkgName string, in io.ReadSeeker, typeSets []map[string]string) ([]byte, error) {
+
+	totalOutput := header
+
+	for _, typeSet := range typeSets {
+
+		// generate the specifics
+		parsed, err := generateSpecific(filename, in, typeSet)
+		if err != nil {
+			return nil, err
+		}
+
+		totalOutput = append(totalOutput, parsed...)
+
+	}
+
+	// clean up the code line by line
+	packageFound := false
+	insideImportBlock := false
+	var cleanOutputLines []string
+	scanner := bufio.NewScanner(bytes.NewReader(totalOutput))
+	for scanner.Scan() {
+
+		// end of imports block?
+		if insideImportBlock {
+			if bytes.HasSuffix(scanner.Bytes(), closeBrace) {
+				insideImportBlock = false
+			}
+			continue
+		}
+
+		if bytes.HasPrefix(scanner.Bytes(), packageKeyword) {
+			if packageFound {
+				continue
+			} else {
+				packageFound = true
+			}
+		} else if bytes.HasPrefix(scanner.Bytes(), importKeyword) {
+			if bytes.HasSuffix(scanner.Bytes(), openBrace) {
+				insideImportBlock = true
+			}
+			continue
+		}
+
+		// check all unwantedLinePrefixes - and skip them
+		skipline := false
+		for _, prefix := range unwantedLinePrefixes {
+			if bytes.HasPrefix(scanner.Bytes(), prefix) {
+				skipline = true
+				continue
+			}
+		}
+
+		if skipline {
+			continue
+		}
+
+		cleanOutputLines = append(cleanOutputLines, makeLine(scanner.Text()))
+	}
+
+	cleanOutput := strings.Join(cleanOutputLines, "")
+
+	output := []byte(cleanOutput)
+	var err error
+
+	// change package name
+	if pkgName != "" {
+		output = changePackage(bytes.NewReader([]byte(output)), pkgName)
+	}
+	// fix the imports
+	output, err = imports.Process(filename, output, nil)
+	if err != nil {
+		return nil, &errImports{Err: err}
+	}
+
+	return output, nil
+}
+
+func makeLine(s string) string {
+	return fmt.Sprintln(strings.TrimRight(s, linefeed))
+}
+
+// isAlphaNumeric gets whether the rune is alphanumeric or _.
+func isAlphaNumeric(r rune) bool {
+	return r == '_' || unicode.IsLetter(r) || unicode.IsDigit(r)
+}
+
+// wordify turns a type into a nice word for function and type
+// names etc.
+func wordify(s string, exported bool) string {
+	s = strings.TrimRight(s, "{}")
+	s = strings.TrimLeft(s, "*&")
+	s = strings.Replace(s, ".", "", -1)
+	if !exported {
+		return s
+	}
+	return strings.ToUpper(string(s[0])) + s[1:]
+}
+
+func changePackage(r io.Reader, pkgName string) []byte {
+	var out bytes.Buffer
+	sc := bufio.NewScanner(r)
+	done := false
+
+	for sc.Scan() {
+		s := sc.Text()
+
+		if !done && strings.HasPrefix(s, "package") {
+			parts := strings.Split(s, " ")
+			parts[1] = pkgName
+			s = strings.Join(parts, " ")
+			done = true
+		}
+
+		fmt.Fprintln(&out, s)
+	}
+	return out.Bytes()
+}
+
+func isExported(lit string) bool {
+	if len(lit) == 0 {
+		return false
+	}
+	return unicode.IsUpper(rune(lit[0]))
+}