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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,
kLexerFlag_ExpectFileName = 1 << 1,
};
struct Lexer
{
void initialize(
SourceFile* sourceFile,
DiagnosticSink* sink,
NamePool* namePool);
~Lexer();
Token lexToken();
TokenList lexAllTokens();
// Begin overriding the reported locations of tokens,
// based on a `#line` directives
void startOverridingSourceLocations(SourceLoc loc);
// Stop overriding source locations, and go back
// to reporting source locations in the original file
void stopOverridingSourceLocations();
SourceFile* sourceFile;
DiagnosticSink* sink;
NamePool* namePool;
char const* cursor;
char const* begin;
char const* end;
// The starting source location for the code as written,
// which cannot be overridden.
SourceLoc spellingStartLoc;
// The nominal starting location for the file, taking
// any active `#line` directive into account.
SourceLoc presumedStartLoc;
TokenFlags tokenFlags;
LexerFlags lexerFlags;
};
// 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, String* outSuffix = 0);
FloatingPointLiteralValue getFloatingPointLiteralValue(Token const& token, String* outSuffix = 0);
}
#endif
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