Libraries: Move to Userland/Libraries/

1 files changed, 146 insertions, 0 deletions

diff --git a/Userland/Libraries/LibCpp/Lexer.h b/Userland/Libraries/LibCpp/Lexer.h
new file mode 100644
index 0000000000..351dee8aa5
--- /dev/null
+++ b/Userland/Libraries/LibCpp/Lexer.h
@@ -0,0 +1,146 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/StringView.h>
+#include <AK/Vector.h>
+
+namespace Cpp {
+
+#define FOR_EACH_TOKEN_TYPE        \
+    __TOKEN(Unknown)               \
+    __TOKEN(Whitespace)            \
+    __TOKEN(PreprocessorStatement) \
+    __TOKEN(IncludeStatement)      \
+    __TOKEN(IncludePath)           \
+    __TOKEN(LeftParen)             \
+    __TOKEN(RightParen)            \
+    __TOKEN(LeftCurly)             \
+    __TOKEN(RightCurly)            \
+    __TOKEN(LeftBracket)           \
+    __TOKEN(RightBracket)          \
+    __TOKEN(Less)                  \
+    __TOKEN(Greater)               \
+    __TOKEN(LessEquals)            \
+    __TOKEN(GreaterEquals)         \
+    __TOKEN(LessLess)              \
+    __TOKEN(GreaterGreater)        \
+    __TOKEN(LessLessEquals)        \
+    __TOKEN(GreaterGreaterEquals)  \
+    __TOKEN(LessGreater)           \
+    __TOKEN(Comma)                 \
+    __TOKEN(Plus)                  \
+    __TOKEN(PlusPlus)              \
+    __TOKEN(PlusEquals)            \
+    __TOKEN(Minus)                 \
+    __TOKEN(MinusMinus)            \
+    __TOKEN(MinusEquals)           \
+    __TOKEN(Asterisk)              \
+    __TOKEN(AsteriskEquals)        \
+    __TOKEN(Slash)                 \
+    __TOKEN(SlashEquals)           \
+    __TOKEN(Percent)               \
+    __TOKEN(PercentEquals)         \
+    __TOKEN(Caret)                 \
+    __TOKEN(CaretEquals)           \
+    __TOKEN(ExclamationMark)       \
+    __TOKEN(ExclamationMarkEquals) \
+    __TOKEN(Equals)                \
+    __TOKEN(EqualsEquals)          \
+    __TOKEN(And)                   \
+    __TOKEN(AndAnd)                \
+    __TOKEN(AndEquals)             \
+    __TOKEN(Pipe)                  \
+    __TOKEN(PipePipe)              \
+    __TOKEN(PipeEquals)            \
+    __TOKEN(Tilde)                 \
+    __TOKEN(QuestionMark)          \
+    __TOKEN(Colon)                 \
+    __TOKEN(ColonColon)            \
+    __TOKEN(ColonColonAsterisk)    \
+    __TOKEN(Semicolon)             \
+    __TOKEN(Dot)                   \
+    __TOKEN(DotAsterisk)           \
+    __TOKEN(Arrow)                 \
+    __TOKEN(ArrowAsterisk)         \
+    __TOKEN(DoubleQuotedString)    \
+    __TOKEN(SingleQuotedString)    \
+    __TOKEN(RawString)             \
+    __TOKEN(EscapeSequence)        \
+    __TOKEN(Comment)               \
+    __TOKEN(Integer)               \
+    __TOKEN(Float)                 \
+    __TOKEN(Keyword)               \
+    __TOKEN(KnownType)             \
+    __TOKEN(Identifier)
+
+struct Position {
+    size_t line;
+    size_t column;
+};
+
+struct Token {
+    enum class Type {
+#define __TOKEN(x) x,
+        FOR_EACH_TOKEN_TYPE
+#undef __TOKEN
+    };
+
+    const char* to_string() const
+    {
+        switch (m_type) {
+#define __TOKEN(x) \
+    case Type::x:  \
+        return #x;
+            FOR_EACH_TOKEN_TYPE
+#undef __TOKEN
+        }
+        ASSERT_NOT_REACHED();
+    }
+
+    Type m_type { Type::Unknown };
+    Position m_start;
+    Position m_end;
+};
+
+class Lexer {
+public:
+    Lexer(const StringView&);
+
+    Vector<Token> lex();
+
+private:
+    char peek(size_t offset = 0) const;
+    char consume();
+
+    StringView m_input;
+    size_t m_index { 0 };
+    Position m_previous_position { 0, 0 };
+    Position m_position { 0, 0 };
+};
+
+}