Make link regular expression only be created once

2018-06-28 00:24:21 +02:00
parent 7fe8ff97e0
commit 20c17c3377
4 changed files with 114 additions and 41 deletions
@@ -0,0 +1,77 @@
+#include "common/LinkParser.hpp"
+
+#include "debug/Log.hpp"
+
+#include <QFile>
+#include <QRegularExpression>
+#include <QString>
+#include <QTextStream>
+
+#include <mutex>
+
+namespace chatterino {
+
+namespace {
+
+std::once_flag regexInitializedFlag;
+QRegularExpression *linkRegex = nullptr;
+
+void initializeRegularExpressions()
+{
+    std::call_once(regexInitializedFlag, [] {
+        QFile tldFile(":/tlds.txt");
+        tldFile.open(QFile::ReadOnly);
+        QTextStream t1(&tldFile);
+        t1.setCodec("UTF-8");
+        QString tldData = t1.readAll();
+        tldData.replace("\n", "|");
+        const QString urlRegExp =
+            "^"
+            // protocol identifier
+            "(?:(?:https?|ftps?)://)?"
+            // user:pass authentication
+            "(?:\\S+(?::\\S*)?@)?"
+            "(?:"
+            // IP address dotted notation octets
+            // excludes loopback network 0.0.0.0
+            // excludes reserved space >= 224.0.0.0
+            // excludes network & broacast addresses
+            // (first & last IP address of each class)
+            "(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])"
+            "(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}"
+            "(?:\\.(?:[1-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))"
+            "|"
+            // host name
+            "(?:(?:[_a-z\\x{00a1}-\\x{ffff}0-9]-*)*[a-z\\x{00a1}-\\x{ffff}0-9]+)"
+            // domain name
+            "(?:\\.(?:[a-z\\x{00a1}-\\x{ffff}0-9]-*)*[a-z\\x{00a1}-\\x{ffff}0-9]+)*"
+            // TLD identifier
+            //"(?:\\.(?:[a-z\\x{00a1}-\\x{ffff}]{2,}))"
+            "(?:[\\.](?:" +
+            tldData +
+            "))"
+            "\\.?"
+            ")"
+            // port number
+            "(?::\\d{2,5})?"
+            // resource path
+            "(?:[/?#]\\S*)?"
+            "$";
+        linkRegex = new QRegularExpression(urlRegExp, QRegularExpression::CaseInsensitiveOption);
+
+        Log("fully initialized");
+    });
+
+    Log("call_once returned");
+}
+
+}  // namespace
+
+LinkParser::LinkParser(const QString &unparsedString)
+{
+    initializeRegularExpressions();
+
+    this->match_ = linkRegex->match(unparsedString);
+}
+
+}  // namespace chatterino