vendor dependencies with dep

vendor/github.com/vanng822/go-premailer/premailer/specificity.go

@@ -0,0 +1,68 @@
+package premailer
+
+import (
+	"regexp"
+	"strings"
+)
+
+// https://developer.mozilla.org/en-US/docs/Web/CSS/Specificity
+// https://developer.mozilla.org/en-US/docs/Web/CSS/Reference#Selectors
+
+type specificity struct {
+	important    int
+	idCount      int
+	classCount   int
+	typeCount    int
+	attrCount    int
+	ruleSetIndex int
+	ruleIndex    int
+}
+
+func (s *specificity) importantOrders() []int {
+	return []int{s.important, s.idCount,
+		s.classCount, s.attrCount,
+		s.typeCount, s.ruleSetIndex,
+		s.ruleIndex}
+}
+
+var _type_selector_regex = regexp.MustCompile("(^|\\s)\\w")
+
+func makeSpecificity(important, ruleSetIndex, ruleIndex int, selector string) *specificity {
+	spec := specificity{}
+	// determine values for priority
+	if important > 0 {
+		spec.important = 1
+	} else {
+		spec.important = 0
+	}
+	spec.idCount = strings.Count(selector, "#")
+	spec.classCount = strings.Count(selector, ".")
+	spec.attrCount = strings.Count(selector, "[")
+	spec.typeCount = len(_type_selector_regex.FindAllString(selector, -1))
+	spec.ruleSetIndex = ruleSetIndex
+	spec.ruleIndex = ruleIndex
+	return &spec
+}
+
+type bySpecificity []*styleRule
+
+func (bs bySpecificity) Len() int {
+	return len(bs)
+}
+func (bs bySpecificity) Swap(i, j int) {
+	bs[i], bs[j] = bs[j], bs[i]
+}
+
+func (bs bySpecificity) Less(i, j int) bool {
+	iorders := bs[i].specificity.importantOrders()
+	jorders := bs[j].specificity.importantOrders()
+	for n, v := range iorders {
+		if v < jorders[n] {
+			return true
+		}
+		if v > jorders[n] {
+			return false
+		}
+	}
+	return false
+}