Add github.com/krishicks/yaml-patch to vendor

vendor/github.com/krishicks/yaml-patch/placeholder_wrapper.go

@@ -0,0 +1,51 @@
+package yamlpatch
+
+import (
+	"fmt"
+	"regexp"
+)
+
+// PlaceholderWrapper can be used to wrap placeholders that make YAML invalid
+// in single quotes to make otherwise valid YAML
+type PlaceholderWrapper struct {
+	LeftSide       string
+	RightSide      string
+	unwrappedRegex *regexp.Regexp
+	wrappedRegex   *regexp.Regexp
+}
+
+// NewPlaceholderWrapper returns a new PlaceholderWrapper which knows how to
+// wrap and unwrap the provided left and right sides of a placeholder, e.g. {{
+// and }}
+func NewPlaceholderWrapper(left, right string) *PlaceholderWrapper {
+	escapedLeft := regexp.QuoteMeta(left)
+	escapedRight := regexp.QuoteMeta(right)
+	unwrappedRegex := regexp.MustCompile(`\s` + escapedLeft + `([^` + escapedRight + `]+)` + escapedRight)
+	wrappedRegex := regexp.MustCompile(`\s'` + escapedLeft + `([^` + escapedRight + `]+)` + escapedRight + `'`)
+
+	return &PlaceholderWrapper{
+		LeftSide:       left,
+		RightSide:      right,
+		unwrappedRegex: unwrappedRegex,
+		wrappedRegex:   wrappedRegex,
+	}
+}
+
+// Wrap the placeholder in single quotes to make it valid YAML
+func (w *PlaceholderWrapper) Wrap(input []byte) []byte {
+	if !w.unwrappedRegex.Match(input) {
+		return input
+	}
+
+	return w.unwrappedRegex.ReplaceAll(input, []byte(fmt.Sprintf(` '%s$1%s'`, w.LeftSide, w.RightSide)))
+}
+
+// Unwrap the single quotes from the placeholder to make it invalid YAML
+// (again)
+func (w *PlaceholderWrapper) Unwrap(input []byte) []byte {
+	if !w.wrappedRegex.Match(input) {
+		return input
+	}
+
+	return w.wrappedRegex.ReplaceAll(input, []byte(fmt.Sprintf(` %s$1%s`, w.LeftSide, w.RightSide)))
+}