1 files changed, 75 insertions, 0 deletions

diff --git a/vendor/golang.org/x/tools/go/buildutil/tags.go b/vendor/golang.org/x/tools/go/buildutil/tags.go
new file mode 100644
index 0000000..486606f
--- /dev/null
+++ b/vendor/golang.org/x/tools/go/buildutil/tags.go
@@ -0,0 +1,75 @@
+package buildutil
+
+// This logic was copied from stringsFlag from $GOROOT/src/cmd/go/build.go.
+
+import "fmt"
+
+const TagsFlagDoc = "a list of `build tags` to consider satisfied during the build. " +
+        "For more information about build tags, see the description of " +
+        "build constraints in the documentation for the go/build package"
+
+// TagsFlag is an implementation of the flag.Value and flag.Getter interfaces that parses
+// a flag value in the same manner as go build's -tags flag and
+// populates a []string slice.
+//
+// See $GOROOT/src/go/build/doc.go for description of build tags.
+// See $GOROOT/src/cmd/go/doc.go for description of 'go build -tags' flag.
+//
+// Example:
+//      flag.Var((*buildutil.TagsFlag)(&build.Default.BuildTags), "tags", buildutil.TagsFlagDoc)
+type TagsFlag []string
+
+func (v *TagsFlag) Set(s string) error {
+        var err error
+        *v, err = splitQuotedFields(s)
+        if *v == nil {
+                *v = []string{}
+        }
+        return err
+}
+
+func (v *TagsFlag) Get() interface{} { return *v }
+
+func splitQuotedFields(s string) ([]string, error) {
+        // Split fields allowing '' or "" around elements.
+        // Quotes further inside the string do not count.
+        var f []string
+        for len(s) > 0 {
+                for len(s) > 0 && isSpaceByte(s[0]) {
+                        s = s[1:]
+                }
+                if len(s) == 0 {
+                        break
+                }
+                // Accepted quoted string. No unescaping inside.
+                if s[0] == '"' || s[0] == '\'' {
+                        quote := s[0]
+                        s = s[1:]
+                        i := 0
+                        for i < len(s) && s[i] != quote {
+                                i++
+                        }
+                        if i >= len(s) {
+                                return nil, fmt.Errorf("unterminated %c string", quote)
+                        }
+                        f = append(f, s[:i])
+                        s = s[i+1:]
+                        continue
+                }
+                i := 0
+                for i < len(s) && !isSpaceByte(s[i]) {
+                        i++
+                }
+                f = append(f, s[:i])
+                s = s[i:]
+        }
+        return f, nil
+}
+
+func (v *TagsFlag) String() string {
+        return "<tagsFlag>"
+}
+
+func isSpaceByte(c byte) bool {
+        return c == ' ' || c == '\t' || c == '\n' || c == '\r'
+}