From fcf83dbf9effab3bd98bad2b83b2468b7eb05cfd Mon Sep 17 00:00:00 2001
From: Tim Foley <tfoley@nvidia.com>
Date: Fri, 9 Jun 2017 11:34:21 -0700
Subject: Initial import of code.

---
 source/slang/lexer.h | 101 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 source/slang/lexer.h

(limited to 'source/slang/lexer.h')

diff --git a/source/slang/lexer.h b/source/slang/lexer.h
new file mode 100644
index 000000000..d11e92d84
--- /dev/null
+++ b/source/slang/lexer.h
@@ -0,0 +1,101 @@
+#ifndef RASTER_RENDERER_LEXER_H
+#define RASTER_RENDERER_LEXER_H
+
+#include "../core/basic.h"
+#include "diagnostics.h"
+
+namespace Slang
+{
+    namespace Compiler
+    {
+        using namespace CoreLib::Basic;
+
+        struct TokenList
+        {
+            Token* begin() const;
+            Token* end() const;
+
+            List<Token> mTokens;
+        };
+
+        struct TokenSpan
+        {
+            TokenSpan();
+            TokenSpan(
+                TokenList const& tokenList)
+                : mBegin(tokenList.begin())
+                , mEnd  (tokenList.end  ())
+            {}
+
+            Token* begin() const { return mBegin; }
+            Token* end  () const { return mEnd  ; }
+
+            int GetCount() { return (int)(mEnd - mBegin); }
+
+            Token* mBegin;
+            Token* mEnd;
+        };
+
+        struct TokenReader
+        {
+            TokenReader();
+            explicit TokenReader(TokenSpan const& tokens)
+                : mCursor(tokens.begin())
+                , mEnd   (tokens.end  ())
+            {}
+            explicit TokenReader(TokenList const& tokens)
+                : mCursor(tokens.begin())
+                , mEnd   (tokens.end  ())
+            {}
+
+            bool IsAtEnd() const { return mCursor == mEnd; }
+            Token PeekToken() const;
+            TokenType PeekTokenType() const;
+            CodePosition PeekLoc() const;
+
+            Token AdvanceToken();
+
+            int GetCount() { return (int)(mEnd - mCursor); }
+
+            Token* mCursor;
+            Token* mEnd;
+        };
+
+        typedef unsigned int LexerFlags;
+        enum
+        {
+            kLexerFlag_InDirective = 1 << 0,
+            kLexerFlag_ExpectFileName = 2 << 0,
+        };
+
+        struct Lexer
+        {
+            Lexer(
+                String const&   path,
+                String const&   content,
+                DiagnosticSink* sink);
+
+            ~Lexer();
+
+            Token lexToken();
+
+            TokenList lexAllTokens();
+
+            String          path;
+            String          content;
+            DiagnosticSink* sink;
+
+            char const*     cursor;
+            char const*     end;
+            CodePosition    loc;
+            TokenFlags      tokenFlags;
+            LexerFlags      lexerFlags;
+        };
+
+        // Helper routines for extracting values from tokens
+        String getStringLiteralTokenValue(Token const& token);
+        String getFileNameTokenValue(Token const& token);
+    }
+}
+
+#endif
\ No newline at end of file
-- 
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