lex.h

简单的pascal词法分析器

#ifndef LEX_H_
#define LEX_H_
#include <iostream>
#include <fstream>
#include <string>
#include <vector>

#define  IDNUM         500
#define  KEYLEN        63
#define  KEYNUM        56

#define  PROGRAM       1
#define  BEGIN         2
#define  END           3
#define  IF            4
#define  THEN          5
#define  ELSE          6
#define  CASE          7
#define  OF            8
#define  FOR           9
#define  TO            10
#define  DO            11
#define  REPEAT        12
#define  UNTIL         13
#define  WHILE         14
#define  CONST         15
#define  VAR           16
#define  ARRAY         17
#define  RECORD        18
#define  TYPE          19
#define  PROCEDURE     20
#define  FUNCTION      21
#define  SHORTINT      22
#define  INTEGER       23
#define  LONGINT       24
#define  REAL          25
#define  SINGLE        26
#define  DOUBLE        27
#define  EXTENDED      28
#define  CHAR          29
#define  STRING        30
#define  BOOLEAN       31
#define  LT            32
#define  LE            33
#define  EQ            34
#define  NE            35
#define  GT            36
#define  GE            37
#define  EVALUATE      38
#define  ADD           39
#define  SUB           40
#define  MUL           41
#define  DIV           42
#define  MOD           43
#define  CLN           44
#define  COMMA         45
#define  SEMICOLON     46
#define  SPOINTS       47
#define  PERIOD        48
#define  LBRACE        49
#define  RBRACE        50
#define  LBRACKTE      51
#define  RBRACKTE      52
#define  SQUOTES       53
#define  POINTER       54
#define  ID            55
#define  INT           56

struct NODE
{
     std::string name;
     int coding;
};

extern std::vector<NODE> id_table;

struct TOKE
{
    int num;
    std::vector<NODE>::size_type pos;
    size_t line;
};

extern std::string strbuf;
extern size_t line;

int token(std::ifstream & , TOKE &);

#endif