refactor: change project structure and package name

pkg/chart/stringutil.go

@@ -0,0 +1,57 @@
+package chart
+
+import "strings"
+
+// SplitCSV splits a corpus by the `,`, dropping leading or trailing whitespace unless quoted.
+func SplitCSV(text string) (output []string) {
+	if len(text) == 0 {
+		return
+	}
+
+	var state int
+	var word []rune
+	var opened rune
+	for _, r := range text {
+		switch state {
+		case 0: // word
+			if isQuote(r) {
+				opened = r
+				state = 1
+			} else if isCSVDelim(r) {
+				output = append(output, strings.TrimSpace(string(word)))
+				word = nil
+			} else {
+				word = append(word, r)
+			}
+		case 1: // we're in a quoted section
+			if matchesQuote(opened, r) {
+				state = 0
+				continue
+			}
+			word = append(word, r)
+		}
+	}
+
+	if len(word) > 0 {
+		output = append(output, strings.TrimSpace(string(word)))
+	}
+	return
+}
+
+func isCSVDelim(r rune) bool {
+	return r == rune(',')
+}
+
+func isQuote(r rune) bool {
+	return r == '"' || r == '\'' || r == '“' || r == '”' || r == '`'
+}
+
+func matchesQuote(a, b rune) bool {
+	if a == '“' && b == '”' {
+		return true
+	}
+	if a == '”' && b == '“' {
+		return true
+	}
+	return a == b
+}