1 files changed, 74 insertions, 0 deletions
diff --git a/libgo/go/cmd/go/internal/modconv/dep.go b/libgo/go/cmd/go/internal/modconv/dep.go
new file mode 100644
index 00000000000..690c206a136
--- /dev/null
+++ b/libgo/go/cmd/go/internal/modconv/dep.go
@@ -0,0 +1,74 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package modconv
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"cmd/go/internal/modfile"
+	"cmd/go/internal/module"
+	"cmd/go/internal/semver"
+)
+
+func ParseGopkgLock(file string, data []byte) (*modfile.File, error) {
+	mf := new(modfile.File)
+	var list []module.Version
+	var r *module.Version
+	for lineno, line := range strings.Split(string(data), "\n") {
+		lineno++
+		if i := strings.Index(line, "#"); i >= 0 {
+			line = line[:i]
+		}
+		line = strings.TrimSpace(line)
+		if line == "[[projects]]" {
+			list = append(list, module.Version{})
+			r = &list[len(list)-1]
+			continue
+		}
+		if strings.HasPrefix(line, "[") {
+			r = nil
+			continue
+		}
+		if r == nil {
+			continue
+		}
+		i := strings.Index(line, "=")
+		if i < 0 {
+			continue
+		}
+		key := strings.TrimSpace(line[:i])
+		val := strings.TrimSpace(line[i+1:])
+		if len(val) >= 2 && val[0] == '"' && val[len(val)-1] == '"' {
+			q, err := strconv.Unquote(val) // Go unquoting, but close enough for now
+			if err != nil {
+				return nil, fmt.Errorf("%s:%d: invalid quoted string: %v", file, lineno, err)
+			}
+			val = q
+		}
+		switch key {
+		case "name":
+			r.Path = val
+		case "revision", "version":
+			// Note: key "version" should take priority over "revision",
+			// and it does, because dep writes toml keys in alphabetical order,
+			// so we see version (if present) second.
+			if key == "version" {
+				if !semver.IsValid(val) || semver.Canonical(val) != val {
+					break
+				}
+			}
+			r.Version = val
+		}
+	}
+	for _, r := range list {
+		if r.Path == "" || r.Version == "" {
+			return nil, fmt.Errorf("%s: empty [[projects]] stanza (%s)", file, r.Path)
+		}
+		mf.Require = append(mf.Require, &modfile.Require{Mod: r})
+	}
+	return mf, nil
+}