1 files changed, 21 insertions, 7 deletions
diff --git a/src/mbgl/util/http_header.cpp b/src/mbgl/util/http_header.cpp
index da68b4a790..4d9e2bf84c 100644
--- a/src/mbgl/util/http_header.cpp
+++ b/src/mbgl/util/http_header.cpp
@@ -2,20 +2,34 @@
 
 #include <mbgl/util/string.hpp>
 
-#include <regex>
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunknown-pragmas"
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#pragma GCC diagnostic ignored "-Wshadow"
+#pragma clang diagnostic push
+
+#pragma clang diagnostic ignored "-Wshorten-64-to-32"
+#pragma clang diagnostic ignored "-Wunknown-warning-option"
+#pragma clang diagnostic ignored "-Wtautological-constant-compare"
+#include <boost/spirit/include/qi.hpp>
+#include <boost/spirit/include/phoenix_core.hpp>
+#include <boost/spirit/include/phoenix_operator.hpp>
+#pragma clang diagnostic pop
+#pragma GCC diagnostic pop
 
 namespace mbgl {
 namespace http {
 
 CacheControl CacheControl::parse(const std::string& value) {
-    std::regex maxAgeRegex(R"((?:[^"]*"[^"]*[^\\]")*[^"]*max-age[\s]*=[\s]*([\d]+).*)");
-    std::smatch maxAgeMatch;
+    namespace qi = boost::spirit::qi;
+    namespace phoenix = boost::phoenix;
 
     CacheControl result;
-    result.mustRevalidate = value.find("must-revalidate") != std::string::npos;
-    if (std::regex_match(value, maxAgeMatch, maxAgeRegex) && maxAgeMatch.size() == 2) {
-        result.maxAge = ::atoll(maxAgeMatch[1].str().c_str());
-    }
+    qi::phrase_parse(value.begin(), value.end(), (
+        (qi::lit("must-revalidate") [ phoenix::ref(result.mustRevalidate) = true ]) |
+        (qi::lit("max-age") >> '=' >> qi::ulong_long [ phoenix::ref(result.maxAge) = qi::_1 ]) |
+        (*(('"' >> *(('\\' >> qi::char_) | (qi::char_ - '"')) >> '"') | (qi::char_ - '"' - ',')))
+    ) % ',', qi::ascii::space);
     return result;
 }