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#ifndef RASTER_RENDERER_LEXER_H
#define RASTER_RENDERER_LEXER_H
#include "../core/basic.h"
#include "diagnostics.h"
namespace Slang
{
struct NamePool;
//
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;
SourceLoc PeekLoc() const;
Token AdvanceToken();
int GetCount() { return (int)(mEnd - mCursor); }
Token* mCursor;
Token* mEnd;
};
typedef unsigned int LexerFlags;
enum
{
kLexerFlag_InDirective = 1 << 0, ///< Turn end-of-line and end-of-file into end-of-directive
kLexerFlag_ExpectFileName = 1 << 1, ///< Support `<>` style strings for file paths
kLexerFlag_IgnoreInvalid = 1 << 2, ///< Suppress errors about invalid/unsupported characters
kLexerFlag_ExpectDirectiveMessage = 1 << 3, ///< Don't lexer ordinary tokens, and instead consume rest of line as a string
};
struct Lexer
{
void initialize(
SourceView* sourceView,
DiagnosticSink* sink,
NamePool* namePool,
MemoryArena* memoryArena);
~Lexer();
Token lexToken(LexerFlags extraFlags = 0);
TokenList lexAllTokens();
SourceView* sourceView;
DiagnosticSink* sink;
NamePool* namePool;
char const* cursor;
char const* begin;
char const* end;
/// The starting sourceLoc (same as first location of SourceView)
SourceLoc startLoc;
TokenFlags tokenFlags;
LexerFlags lexerFlags;
MemoryArena* memoryArena;
};
// Helper routines for extracting values from tokens
String getStringLiteralTokenValue(Token const& token);
String getFileNameTokenValue(Token const& token);
typedef int64_t IntegerLiteralValue;
typedef double FloatingPointLiteralValue;
IntegerLiteralValue getIntegerLiteralValue(Token const& token, UnownedStringSlice* outSuffix = 0);
FloatingPointLiteralValue getFloatingPointLiteralValue(Token const& token, UnownedStringSlice* outSuffix = 0);
}
#endif
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