add lib/pq

vendor/github.com/lib/pq/internal/pqsql/copy.go

@@ -0,0 +1,37 @@
+package pqsql
+
+// StartsWithCopy reports if the SQL strings start with "copy", ignoring
+// whitespace, comments, and casing.
+func StartsWithCopy(query string) bool {
+	if len(query) < 4 {
+		return false
+	}
+	var linecmt, blockcmt bool
+	for i := 0; i < len(query); i++ {
+		c := query[i]
+		if linecmt {
+			linecmt = c != '\n'
+			continue
+		}
+		if blockcmt {
+			blockcmt = !(c == '/' && query[i-1] == '*')
+			continue
+		}
+		if c == '-' && len(query) > i+1 && query[i+1] == '-' {
+			linecmt = true
+			continue
+		}
+		if c == '/' && len(query) > i+1 && query[i+1] == '*' {
+			blockcmt = true
+			continue
+		}
+		if c == ' ' || c == '\t' || c == '\r' || c == '\n' {
+			continue
+		}
+
+		// First non-comment and non-whitespace.
+		return len(query) > i+3 && c|0x20 == 'c' && query[i+1]|0x20 == 'o' &&
+			query[i+2]|0x20 == 'p' && query[i+3]|0x20 == 'y'
+	}
+	return false
+}