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/* Project STARSHATTER
John DiCamillo
Copyright © 1997-2001. All Rights Reserved.
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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