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/* Starshatter OpenSource Distribution
Copyright (c) 1997-2004, Destroyer Studios LLC.
All Rights Reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* 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.
* Neither the name "Destroyer Studios" nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
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.
SUBSYSTEM: Parser
FILE: Token.h
AUTHOR: John DiCamillo
OVERVIEW
========
Scanner class definition
*/
#ifndef Token_h
#define Token_h
#include "Text.h"
#include "Dictionary.h"
#pragma warning( disable : 4237)
// +-------------------------------------------------------------------+
class Reader;
class Token;
class Scanner;
// +-------------------------------------------------------------------+
class Token
{
friend class Scanner;
public:
// keywords must be alphanumeric identifiers or symbolic identifiers
enum Types { Undefined, Keyword, AlphaIdent, SymbolicIdent, Comment,
IntLiteral, FloatLiteral, StringLiteral, CharLiteral,
Dot, Comma, Colon, Semicolon,
LParen, RParen, LBracket, RBracket, LBrace, RBrace,
EOT, LastTokenType };
enum Alias { CompoundSeparator = Dot,
ItemSeparator = Comma,
StatementTerminator = Semicolon,
TypeIndicator = Colon,
Lambda = LastTokenType + 1 };
Token();
Token(const Token& rhs);
Token(int t);
Token(const char* s, int t, int k=0, int l=0, int c=0);
Token(const Text& s, int t, int k=0, int l=0, int c=0);
~Token();
Token& operator = (const Token& rhs);
bool match(const Token& ref) const;
Text symbol() const;
int type() const { return mType; }
int key() const { return mKey; }
int line() const { return mLine; }
int column() const { return mColumn; }
Text typestr() const;
static Text describe(const Text& tok);
static void addKey(const Text& k, int v);
static void addKeys(Dictionary<int>& keys);
static bool findKey(const Text& k, int& v);
static void comments(const Text& begin, const Text& end);
static void altComments(const Text& begin, const Text& end);
static void hideComments(bool hide = true) { hidecom = hide; }
static char comBeg(unsigned int i) { return combeg[i]; }
static char comEnd(unsigned int i) { return comend[i]; }
static char altBeg(unsigned int i) { return altbeg[i]; }
static char altEnd(unsigned int i) { return altend[i]; }
static void close();
protected:
int mLength;
union {
char mSymbol[8];
char* mFullSymbol;
};
int mType;
int mKey;
int mLine;
int mColumn;
static bool hidecom;
static char combeg[3];
static char comend[3];
static char altbeg[3];
static char altend[3];
static Dictionary<int> keymap;
};
// +-------------------------------------------------------------------+
class Scanner
{
public:
Scanner(Reader* r = 0);
Scanner(const Text& s);
Scanner(const Scanner& rhs);
virtual ~Scanner();
Scanner& operator = (const Scanner& rhs);
void Load(const Text& s);
enum Need { Demand, Request };
virtual Token Get(Need n = Demand);
void PutBack() { index = old_index; line = old_line; }
int GetCursor() { return index; }
int GetLine() { return line; }
void Reset(int c, int l) { index = old_index = c; line = old_line = l; }
Token Best() const { return best; }
protected:
virtual int GetNumeric();
virtual bool IsSymbolic(char c);
virtual bool IsAlpha(char c);
Reader* reader;
char* str;
const char* p;
const char* eos;
size_t index;
size_t old_index;
Token best;
size_t length;
size_t line;
size_t old_line;
size_t lineStart;
};
#endif // TOKEN_H
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