STOR-519: Add db-connect, a SQL over HTTPS server

vendor/github.com/kshvakov/clickhouse/word_matcher.go

@@ -0,0 +1,31 @@
+package clickhouse
+
+import (
+	"strings"
+	"unicode"
+)
+
+// wordMatcher is a simple automata to match a single word (case insensitive)
+type wordMatcher struct {
+	word     []rune
+	position uint8
+}
+
+// newMatcher returns matcher for word needle
+func newMatcher(needle string) *wordMatcher {
+	return &wordMatcher{word: []rune(strings.ToUpper(needle)),
+		position: 0}
+}
+
+func (m *wordMatcher) matchRune(r rune) bool {
+	if m.word[m.position] == unicode.ToUpper(r) {
+		if m.position == uint8(len(m.word)-1) {
+			m.position = 0
+			return true
+		}
+		m.position++
+	} else {
+		m.position = 0
+	}
+	return false
+}