[dev.cmdgo] cmd: pull in x/mod on the dev.cmdgo branch

This change changes the requirement on golang.org/x/mod to require the
top of the dev.cmdgo branch of that repository. This allows the code
on this branch to use the changes on the branch on that repo for parsing
go.work files. It also vendors in those changes using go mod vendor.

Generated using:
  go get -d golang.org/x/mod@dev.cmdgo
  go mod tidy
  go mod vendor

For #45713

Change-Id: I7a20835937c13f90d17c0f39d96b435daec89fba
Reviewed-on: https://go-review.googlesource.com/c/go/+/334933
Trust: Michael Matloob <matloob@golang.org>
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>

1 files changed, 169 insertions, 81 deletions

diff --git a/src/cmd/vendor/golang.org/x/mod/modfile/rule.go b/src/cmd/vendor/golang.org/x/mod/modfile/rule.go
index 78f83fa714..d6a2d3879e 100644
--- a/src/cmd/vendor/golang.org/x/mod/modfile/rule.go
+++ b/src/cmd/vendor/golang.org/x/mod/modfile/rule.go
@@ -423,68 +423,12 @@ func (f *File) add(errs *ErrorList, block *LineBlock, line *Line, verb string, a
 		}
 
 	case "replace":
-		arrow := 2
-		if len(args) >= 2 && args[1] == "=>" {
-			arrow = 1
-		}
-		if len(args) < arrow+2 || len(args) > arrow+3 || args[arrow] != "=>" {
-			errorf("usage: %s module/path [v1.2.3] => other/module v1.4\n\t or %s module/path [v1.2.3] => ../local/directory", verb, verb)
-			return
-		}
-		s, err := parseString(&args[0])
-		if err != nil {
-			errorf("invalid quoted string: %v", err)
-			return
-		}
-		pathMajor, err := modulePathMajor(s)
-		if err != nil {
-			wrapModPathError(s, err)
-			return
-		}
-		var v string
-		if arrow == 2 {
-			v, err = parseVersion(verb, s, &args[1], fix)
-			if err != nil {
-				wrapError(err)
-				return
-			}
-			if err := module.CheckPathMajor(v, pathMajor); err != nil {
-				wrapModPathError(s, err)
-				return
-			}
-		}
-		ns, err := parseString(&args[arrow+1])
-		if err != nil {
-			errorf("invalid quoted string: %v", err)
+		replace, wrappederr := parseReplace(f.Syntax.Name, line, verb, args, fix)
+		if wrappederr != nil {
+			*errs = append(*errs, *wrappederr)
 			return
 		}
-		nv := ""
-		if len(args) == arrow+2 {
-			if !IsDirectoryPath(ns) {
-				errorf("replacement module without version must be directory path (rooted or starting with ./ or ../)")
-				return
-			}
-			if filepath.Separator == '/' && strings.Contains(ns, `\`) {
-				errorf("replacement directory appears to be Windows path (on a non-windows system)")
-				return
-			}
-		}
-		if len(args) == arrow+3 {
-			nv, err = parseVersion(verb, ns, &args[arrow+2], fix)
-			if err != nil {
-				wrapError(err)
-				return
-			}
-			if IsDirectoryPath(ns) {
-				errorf("replacement module directory path %q cannot have version", ns)
-				return
-			}
-		}
-		f.Replace = append(f.Replace, &Replace{
-			Old:    module.Version{Path: s, Version: v},
-			New:    module.Version{Path: ns, Version: nv},
-			Syntax: line,
-		})
+		f.Replace = append(f.Replace, replace)
 
 	case "retract":
 		rationale := parseDirectiveComment(block, line)
@@ -515,6 +459,83 @@ func (f *File) add(errs *ErrorList, block *LineBlock, line *Line, verb string, a
 	}
 }
 
+func parseReplace(filename string, line *Line, verb string, args []string, fix VersionFixer) (*Replace, *Error) {
+	wrapModPathError := func(modPath string, err error) *Error {
+		return &Error{
+			Filename: filename,
+			Pos:      line.Start,
+			ModPath:  modPath,
+			Verb:     verb,
+			Err:      err,
+		}
+	}
+	wrapError := func(err error) *Error {
+		return &Error{
+			Filename: filename,
+			Pos:      line.Start,
+			Err:      err,
+		}
+	}
+	errorf := func(format string, args ...interface{}) *Error {
+		return wrapError(fmt.Errorf(format, args...))
+	}
+
+	arrow := 2
+	if len(args) >= 2 && args[1] == "=>" {
+		arrow = 1
+	}
+	if len(args) < arrow+2 || len(args) > arrow+3 || args[arrow] != "=>" {
+		return nil, errorf("usage: %s module/path [v1.2.3] => other/module v1.4\n\t or %s module/path [v1.2.3] => ../local/directory", verb, verb)
+	}
+	s, err := parseString(&args[0])
+	if err != nil {
+		return nil, errorf("invalid quoted string: %v", err)
+	}
+	pathMajor, err := modulePathMajor(s)
+	if err != nil {
+		return nil, wrapModPathError(s, err)
+
+	}
+	var v string
+	if arrow == 2 {
+		v, err = parseVersion(verb, s, &args[1], fix)
+		if err != nil {
+			return nil, wrapError(err)
+		}
+		if err := module.CheckPathMajor(v, pathMajor); err != nil {
+			return nil, wrapModPathError(s, err)
+		}
+	}
+	ns, err := parseString(&args[arrow+1])
+	if err != nil {
+		return nil, errorf("invalid quoted string: %v", err)
+	}
+	nv := ""
+	if len(args) == arrow+2 {
+		if !IsDirectoryPath(ns) {
+			return nil, errorf("replacement module without version must be directory path (rooted or starting with ./ or ../)")
+		}
+		if filepath.Separator == '/' && strings.Contains(ns, `\`) {
+			return nil, errorf("replacement directory appears to be Windows path (on a non-windows system)")
+		}
+	}
+	if len(args) == arrow+3 {
+		nv, err = parseVersion(verb, ns, &args[arrow+2], fix)
+		if err != nil {
+			return nil, wrapError(err)
+		}
+		if IsDirectoryPath(ns) {
+			return nil, errorf("replacement module directory path %q cannot have version", ns)
+
+		}
+	}
+	return &Replace{
+		Old:    module.Version{Path: s, Version: v},
+		New:    module.Version{Path: ns, Version: nv},
+		Syntax: line,
+	}, nil
+}
+
 // fixRetract applies fix to each retract directive in f, appending any errors
 // to errs.
 //
@@ -556,6 +577,63 @@ func (f *File) fixRetract(fix VersionFixer, errs *ErrorList) {
 	}
 }
 
+func (f *WorkFile) add(errs *ErrorList, line *Line, verb string, args []string, fix VersionFixer) {
+	wrapError := func(err error) {
+		*errs = append(*errs, Error{
+			Filename: f.Syntax.Name,
+			Pos:      line.Start,
+			Err:      err,
+		})
+	}
+	errorf := func(format string, args ...interface{}) {
+		wrapError(fmt.Errorf(format, args...))
+	}
+
+	switch verb {
+	default:
+		errorf("unknown directive: %s", verb)
+
+	case "go":
+		if f.Go != nil {
+			errorf("repeated go statement")
+			return
+		}
+		if len(args) != 1 {
+			errorf("go directive expects exactly one argument")
+			return
+		} else if !GoVersionRE.MatchString(args[0]) {
+			errorf("invalid go version '%s': must match format 1.23", args[0])
+			return
+		}
+
+		f.Go = &Go{Syntax: line}
+		f.Go.Version = args[0]
+
+	case "directory":
+		if len(args) != 1 {
+			errorf("usage: %s local/dir", verb)
+			return
+		}
+		s, err := parseString(&args[0])
+		if err != nil {
+			errorf("invalid quoted string: %v", err)
+			return
+		}
+		f.Directory = append(f.Directory, &Directory{
+			Path:   s,
+			Syntax: line,
+		})
+
+	case "replace":
+		replace, wrappederr := parseReplace(f.Syntax.Name, line, verb, args, fix)
+		if wrappederr != nil {
+			*errs = append(*errs, *wrappederr)
+			return
+		}
+		f.Replace = append(f.Replace, replace)
+	}
+}
+
 // IsDirectoryPath reports whether the given path should be interpreted
 // as a directory path. Just like on the go command line, relative paths
 // and rooted paths are directory paths; the rest are module paths.
@@ -1165,6 +1243,10 @@ func (f *File) DropExclude(path, vers string) error {
 }
 
 func (f *File) AddReplace(oldPath, oldVers, newPath, newVers string) error {
+	return addReplace(f.Syntax, &f.Replace, oldPath, oldVers, newPath, newVers)
+}
+
+func addReplace(syntax *FileSyntax, replace *[]*Replace, oldPath, oldVers, newPath, newVers string) error {
 	need := true
 	old := module.Version{Path: oldPath, Version: oldVers}
 	new := module.Version{Path: newPath, Version: newVers}
@@ -1178,12 +1260,12 @@ func (f *File) AddReplace(oldPath, oldVers, newPath, newVers string) error {
 	}
 
 	var hint *Line
-	for _, r := range f.Replace {
+	for _, r := range *replace {
 		if r.Old.Path == oldPath && (oldVers == "" || r.Old.Version == oldVers) {
 			if need {
 				// Found replacement for old; update to use new.
 				r.New = new
-				f.Syntax.updateLine(r.Syntax, tokens...)
+				syntax.updateLine(r.Syntax, tokens...)
 				need = false
 				continue
 			}
@@ -1196,7 +1278,7 @@ func (f *File) AddReplace(oldPath, oldVers, newPath, newVers string) error {
 		}
 	}
 	if need {
-		f.Replace = append(f.Replace, &Replace{Old: old, New: new, Syntax: f.Syntax.addLine(hint, tokens...)})
+		*replace = append(*replace, &Replace{Old: old, New: new, Syntax: syntax.addLine(hint, tokens...)})
 	}
 	return nil
 }
@@ -1282,30 +1364,36 @@ func (f *File) SortBlocks() {
 // retract directives are not de-duplicated since comments are
 // meaningful, and versions may be retracted multiple times.
 func (f *File) removeDups() {
+	removeDups(f.Syntax, &f.Exclude, &f.Replace)
+}
+
+func removeDups(syntax *FileSyntax, exclude *[]*Exclude, replace *[]*Replace) {
 	kill := make(map[*Line]bool)
 
 	// Remove duplicate excludes.
-	haveExclude := make(map[module.Version]bool)
-	for _, x := range f.Exclude {
-		if haveExclude[x.Mod] {
-			kill[x.Syntax] = true
-			continue
+	if exclude != nil {
+		haveExclude := make(map[module.Version]bool)
+		for _, x := range *exclude {
+			if haveExclude[x.Mod] {
+				kill[x.Syntax] = true
+				continue
+			}
+			haveExclude[x.Mod] = true
 		}
-		haveExclude[x.Mod] = true
-	}
-	var excl []*Exclude
-	for _, x := range f.Exclude {
-		if !kill[x.Syntax] {
-			excl = append(excl, x)
+		var excl []*Exclude
+		for _, x := range *exclude {
+			if !kill[x.Syntax] {
+				excl = append(excl, x)
+			}
 		}
+		*exclude = excl
 	}
-	f.Exclude = excl
 
 	// Remove duplicate replacements.
 	// Later replacements take priority over earlier ones.
 	haveReplace := make(map[module.Version]bool)
-	for i := len(f.Replace) - 1; i >= 0; i-- {
-		x := f.Replace[i]
+	for i := len(*replace) - 1; i >= 0; i-- {
+		x := (*replace)[i]
 		if haveReplace[x.Old] {
 			kill[x.Syntax] = true
 			continue
@@ -1313,18 +1401,18 @@ func (f *File) removeDups() {
 		haveReplace[x.Old] = true
 	}
 	var repl []*Replace
-	for _, x := range f.Replace {
+	for _, x := range *replace {
 		if !kill[x.Syntax] {
 			repl = append(repl, x)
 		}
 	}
-	f.Replace = repl
+	*replace = repl
 
 	// Duplicate require and retract directives are not removed.
 
 	// Drop killed statements from the syntax tree.
 	var stmts []Expr
-	for _, stmt := range f.Syntax.Stmt {
+	for _, stmt := range syntax.Stmt {
 		switch stmt := stmt.(type) {
 		case *Line:
 			if kill[stmt] {
@@ -1344,7 +1432,7 @@ func (f *File) removeDups() {
 		}
 		stmts = append(stmts, stmt)
 	}
-	f.Syntax.Stmt = stmts
+	syntax.Stmt = stmts
 }
 
 // lineLess returns whether li should be sorted before lj. It sorts