all: remove some unused code and other minor cleanups

From bits in git stashes I have accumulated in the last few weeks.
versionForModFile has been unused since https://cuelang.org/cl/1194044,
matchPattern was deleted as unused in https://cuelang.org/cl/1177665,
and replace the uses of deprecated APIs in encoding/json.

Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Change-Id: I351cef6bf2bb8ab3910c5d30f7085be2d7ddeac6
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1194117
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
Reviewed-by: Paul Jolly <paul@myitcv.io>

cmd/cue/cmd/custom.go

@@ -281,7 +281,7 @@ var testServerOnce = sync.OnceValue(func() string {
 	s := httptest.NewServer(http.HandlerFunc(
 		func(w http.ResponseWriter, req *http.Request) {
 			data, _ := io.ReadAll(req.Body)
-			d := map[string]interface{}{
+			d := map[string]string{
 				"data": string(data),
 				"when": "now",
 			}

cmd/cue/cmd/modinit.go

@@ -21,8 +21,6 @@ import (
 	"strings"
 
 	"github.com/spf13/cobra"
-	gomodule "golang.org/x/mod/module"
-	"golang.org/x/mod/semver"
 
 	"cuelang.org/go/internal/cueexperiment"
 	"cuelang.org/go/internal/cueversion"
@@ -122,30 +120,3 @@ func runModInit(cmd *Command, args []string) (err error) {
 
 	return err
 }
-
-func versionForModFile() string {
-	version := cueversion.LanguageVersion()
-	earliestPossibleVersion := modfile.EarliestClosedSchemaVersion()
-	if semver.Compare(version, earliestPossibleVersion) < 0 {
-		// The reported version is earlier than it should be,
-		// which can occur for some pseudo versions, or
-		// potentially the cue command has been forked and
-		// published under an independent version numbering.
-		//
-		// In this case, we use the latest known schema version
-		// as the best guess as to a version that actually
-		// reflects the capabilities of the module file.
-		version = modfile.LatestKnownSchemaVersion()
-	}
-	if gomodule.IsPseudoVersion(version) {
-		// If we have a version like v0.7.1-0.20240130142347-7855e15cb701
-		// we want it to turn into the base version (v0.7.0 in that example).
-		// Subject the resulting base version to the same sanity check
-		// as above.
-		pv, _ := gomodule.PseudoVersionBase(version)
-		if pv != "" && semver.Compare(pv, earliestPossibleVersion) >= 0 {
-			version = pv
-		}
-	}
-	return version
-}

cue/ast/astutil/resolve.go

@@ -385,12 +385,12 @@ func resolveIdent(s *scope, x *ast.Ident) bool {
 		return false
 	}
 	if _, obj, node := s.lookup(name); node.node != nil {
-		switch {
-		case x.Node == nil:
+		switch x.Node {
+		case nil:
 			x.Node = node.node
 			x.Scope = obj
 
-		case x.Node == node.node:
+		case node.node:
 			x.Scope = obj
 
 		default: // x.Node != node

cue/format/format.go

@@ -202,7 +202,7 @@ func newFormatter(p *printer) *formatter {
 type whiteSpace int
 
 const (
-	ignore whiteSpace = 0
+	_ whiteSpace = 0
 
 	// write a space, or disallow it
 	blank whiteSpace = 1 << iota

cue/load/search.go

@@ -15,8 +15,6 @@
 package load
 
 import (
-	// TODO: remove this usage
-
 	"io/fs"
 	"path"
 	"path/filepath"

encoding/json/json.go

@@ -28,7 +28,6 @@ import (
 	"cuelang.org/go/cue/literal"
 	"cuelang.org/go/cue/parser"
 	"cuelang.org/go/cue/token"
-	"cuelang.org/go/internal/value"
 )
 
 // Valid reports whether data is a valid JSON encoding.
@@ -42,15 +41,14 @@ func Validate(b []byte, v cue.Value) error {
 	if !json.Valid(b) {
 		return fmt.Errorf("json: invalid JSON")
 	}
-	r := value.ConvertToRuntime(v.Context())
-	inst, err := r.Compile("json.Validate", b)
-	if err != nil {
+	v2 := v.Context().CompileBytes(b, cue.Filename("json.Validate"))
+	if err := v2.Err(); err != nil {
 		return err
 	}
 
-	v = v.Unify(inst.Value())
-	if v.Err() != nil {
-		return v.Err()
+	v = v.Unify(v2)
+	if err := v.Err(); err != nil {
+		return err
 	}
 	return v.Validate(cue.Final())
 }