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142 lines
4.0 KiB
C++
142 lines
4.0 KiB
C++
#ifndef COMPILER_SCANNER_H_INCLUDED
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#define COMPILER_SCANNER_H_INCLUDED
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#include <string>
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#include <iosfwd>
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#include <vector>
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#include "tokenloc.hpp"
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namespace Compiler
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{
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class ErrorHandler;
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class Parser;
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class Extensions;
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/// \brief Scanner
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///
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/// This class translate a char-stream to a token stream (delivered via
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/// parser-callbacks).
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class Scanner
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{
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enum putback_type
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{
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Putback_None, Putback_Special, Putback_Integer, Putback_Float,
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Putback_Name, Putback_Keyword
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};
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ErrorHandler& mErrorHandler;
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TokenLoc mLoc;
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TokenLoc mPrevLoc;
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std::istream& mStream;
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const Extensions *mExtensions;
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putback_type mPutback;
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int mPutbackCode;
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int mPutbackInteger;
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float mPutbackFloat;
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std::string mPutbackName;
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TokenLoc mPutbackLoc;
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bool mStrictKeywords;
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bool mTolerantNames;
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public:
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enum keyword
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{
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K_begin, K_end,
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K_short, K_long, K_float,
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K_if, K_endif, K_else, K_elseif,
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K_while, K_endwhile,
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K_return,
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K_messagebox,
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K_set, K_to,
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K_getsquareroot,
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K_menumode,
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K_random,
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K_startscript, K_stopscript, K_scriptrunning,
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K_getdistance,
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K_getsecondspassed,
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K_enable, K_disable, K_getdisabled
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};
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enum special
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{
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S_newline,
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S_open, S_close,
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S_cmpEQ, S_cmpNE, S_cmpLT, S_cmpLE, S_cmpGT, S_cmpGE,
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S_plus, S_minus, S_mult, S_div,
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S_comma,
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S_ref,
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S_member
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};
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private:
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// not implemented
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Scanner (const Scanner&);
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Scanner& operator= (const Scanner&);
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bool get (char& c);
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void putback (char c);
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bool scanToken (Parser& parser);
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bool scanInt (char c, Parser& parser, bool& cont);
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bool scanFloat (const std::string& intValue, Parser& parser, bool& cont);
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bool scanName (char c, Parser& parser, bool& cont);
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/// \param name May contain the start of the name (one or more characters)
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bool scanName (std::string& name);
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bool scanSpecial (char c, Parser& parser, bool& cont);
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bool isStringCharacter (char c, bool lookAhead = true);
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static bool isWhitespace (char c);
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public:
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Scanner (ErrorHandler& errorHandler, std::istream& inputStream,
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const Extensions *extensions = 0);
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///< constructor
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void scan (Parser& parser);
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///< Scan a token and deliver it to the parser.
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void putbackSpecial (int code, const TokenLoc& loc);
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///< put back a special token
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void putbackInt (int value, const TokenLoc& loc);
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///< put back an integer token
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void putbackFloat (float value, const TokenLoc& loc);
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///< put back a float token
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void putbackName (const std::string& name, const TokenLoc& loc);
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///< put back a name token
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void putbackKeyword (int keyword, const TokenLoc& loc);
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///< put back a keyword token
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void listKeywords (std::vector<std::string>& keywords);
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///< Append all known keywords to \a keywords.
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/// Do not accept keywords in quotation marks anymore.
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///
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/// \attention This mode lasts only until the next newline is reached.
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void enableStrictKeywords();
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/// Continue parsing a name when hitting a '.' or a '-'
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///
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/// \attention This mode lasts only until the next newline is reached.
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void enableTolerantNames();
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};
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}
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#endif
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