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-rw-r--r--xpcom/string/nsTSubstringTuple.h84
1 files changed, 84 insertions, 0 deletions
diff --git a/xpcom/string/nsTSubstringTuple.h b/xpcom/string/nsTSubstringTuple.h
new file mode 100644
index 000000000..5d24e2159
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+++ b/xpcom/string/nsTSubstringTuple.h
@@ -0,0 +1,84 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+// IWYU pragma: private, include "nsString.h"
+
+/**
+ * nsTSubstringTuple_CharT
+ *
+ * Represents a tuple of string fragments. Built as a recursive binary tree.
+ * It is used to implement the concatenation of two or more string objects.
+ *
+ * NOTE: This class is a private implementation detail and should never be
+ * referenced outside the string code.
+ */
+class nsTSubstringTuple_CharT
+{
+public:
+
+ typedef CharT char_type;
+ typedef nsCharTraits<char_type> char_traits;
+
+ typedef nsTSubstringTuple_CharT self_type;
+ typedef nsTSubstring_CharT substring_type;
+ typedef nsTSubstring_CharT base_string_type;
+ typedef uint32_t size_type;
+
+public:
+
+ nsTSubstringTuple_CharT(const base_string_type* aStrA,
+ const base_string_type* aStrB)
+ : mHead(nullptr)
+ , mFragA(aStrA)
+ , mFragB(aStrB)
+ {
+ }
+
+ nsTSubstringTuple_CharT(const self_type& aHead,
+ const base_string_type* aStrB)
+ : mHead(&aHead)
+ , mFragA(nullptr) // this fragment is ignored when aHead != nullptr
+ , mFragB(aStrB)
+ {
+ }
+
+ /**
+ * computes the aggregate string length
+ */
+ size_type Length() const;
+
+ /**
+ * writes the aggregate string to the given buffer. bufLen is assumed
+ * to be equal to or greater than the value returned by the Length()
+ * method. the string written to |buf| is not null-terminated.
+ */
+ void WriteTo(char_type* aBuf, uint32_t aBufLen) const;
+
+ /**
+ * returns true if this tuple is dependent on (i.e., overlapping with)
+ * the given char sequence.
+ */
+ bool IsDependentOn(const char_type* aStart, const char_type* aEnd) const;
+
+private:
+
+ const self_type* mHead;
+ const base_string_type* mFragA;
+ const base_string_type* mFragB;
+};
+
+inline const nsTSubstringTuple_CharT
+operator+(const nsTSubstringTuple_CharT::base_string_type& aStrA,
+ const nsTSubstringTuple_CharT::base_string_type& aStrB)
+{
+ return nsTSubstringTuple_CharT(&aStrA, &aStrB);
+}
+
+inline const nsTSubstringTuple_CharT
+operator+(const nsTSubstringTuple_CharT& aHead,
+ const nsTSubstringTuple_CharT::base_string_type& aStrB)
+{
+ return nsTSubstringTuple_CharT(aHead, &aStrB);
+}