From d82f9945b85fbf8c5859ed345c719cb67b548e38 Mon Sep 17 00:00:00 2001
From: xushiwei <x@goplus.org>
Date: Fri, 20 Oct 2023 01:26:17 +0800
Subject: [PATCH] gopmod.Default

---
 gopmod/module.go        |  5 +++++
 modfile/gop_test.go     | 13 +++++++++++++
 modfile/regtest_test.go | 13 +++++++++++++
 modfile/rule.go         |  3 +++
 modload/module.go       | 18 ++++++++++++++++++
 5 files changed, 52 insertions(+)
 create mode 100644 modfile/regtest_test.go

diff --git a/gopmod/module.go b/gopmod/module.go
index 33c5aba..fe584cc 100644
--- a/gopmod/module.go
+++ b/gopmod/module.go
@@ -222,3 +222,8 @@ func (e *MissingError) Error() string {
 }
 
 // -----------------------------------------------------------------------------
+
+// Default represents the default gop.mod object.
+var Default = New(modload.Default)
+
+// -----------------------------------------------------------------------------
diff --git a/modfile/gop_test.go b/modfile/gop_test.go
index ef094e4..000053a 100644
--- a/modfile/gop_test.go
+++ b/modfile/gop_test.go
@@ -169,6 +169,19 @@ func TestGoModCompat2(t *testing.T) {
 	}
 }
 
+func TestGoModStd(t *testing.T) {
+	const (
+		gopmod = "module std\n"
+	)
+	f, err := ParseLax("go.mod", []byte(gopmod), nil)
+	if err != nil {
+		t.Fatal("modfile.ParseLax failed:", err)
+	}
+	if f.Module.Mod.Path != "" {
+		t.Fatal("modfile.ParseLax:", f.Module.Mod.Path)
+	}
+}
+
 // -----------------------------------------------------------------------------
 
 func TestParse2(t *testing.T) {
diff --git a/modfile/regtest_test.go b/modfile/regtest_test.go
new file mode 100644
index 0000000..89e32a3
--- /dev/null
+++ b/modfile/regtest_test.go
@@ -0,0 +1,13 @@
+package modfile_test
+
+import (
+	"testing"
+
+	"github.com/goplus/mod/gopmod"
+)
+
+func TestGopMod(t *testing.T) {
+	if path := gopmod.Default.Path(); path != "" {
+		t.Fatal("TestGopMod:", path)
+	}
+}
diff --git a/modfile/rule.go b/modfile/rule.go
index 464faa3..0d80038 100644
--- a/modfile/rule.go
+++ b/modfile/rule.go
@@ -118,6 +118,9 @@ func parseToFile(file string, data []byte, fix VersionFixer, strict bool) (parse
 		err = errors.NewWith(err, `modfile.ParseLax(file, data, fix)`, -2, "modfile.ParseLax", file, data, fix)
 		return
 	}
+	if mod := f.Module; mod != nil && mod.Mod.Path == "std" {
+		mod.Mod.Path = "" // the Go std module
+	}
 	parsed = &File{File: *f}
 
 	var errs ErrorList
diff --git a/modload/module.go b/modload/module.go
index df9a863..7accf02 100644
--- a/modload/module.go
+++ b/modload/module.go
@@ -266,3 +266,21 @@ func getVerb(e modfile.Expr) string {
 }
 
 // -----------------------------------------------------------------------------
+
+const (
+	defaultGoVer  = "1.18"
+	defaultGopVer = "1.1"
+)
+
+// Default represents the default gop.mod object.
+var Default = Module{
+	File: &modfile.File{
+		File: gomodfile.File{
+			Module: &gomodfile.Module{},
+			Go:     &gomodfile.Go{Version: defaultGoVer},
+		},
+		Gop: &modfile.Gop{Version: defaultGopVer},
+	},
+}
+
+// -----------------------------------------------------------------------------