FlexLexer.h
// -*-C++-*-
// FlexLexer.h -- define interfaces for lexical analyzer classes generated
// by flex
// Copyright (c) 1993 The Regents of the University of California.
// All rights reserved.
//
// This code is derived from software contributed to Berkeley by
// Kent Williams and Tom Epperly.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. 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 of the University 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE.
// This file defines FlexLexer, an abstract class which specifies the
// external interface provided to flex C++ lexer objects, and yyFlexLexer,
// which defines a particular lexer class.
//
// If you want to create multiple lexer classes, you use the -P flag
// to rename each yyFlexLexer to some other xxFlexLexer. You then
// include <FlexLexer.h> in your other sources once per lexer class:
//
// #undef yyFlexLexer
// #define yyFlexLexer xxFlexLexer
// #include <FlexLexer.h>
//
// #undef yyFlexLexer
// #define yyFlexLexer zzFlexLexer
// #include <FlexLexer.h>
// ...
#ifndef __FLEX_LEXER_H
// Never included before - need to define base class.
#define __FLEX_LEXER_H
#include <iostream>
#ifndef FLEX_STD
#define FLEX_STD std::
#endif
extern "C++" {
struct yy_buffer_state;
typedef int yy_state_type;
class FlexLexer
{
public:
virtual ~FlexLexer() {}
const char *YYText() const { return yytext; }
int YYLeng() const { return yyleng; }
virtual void yy_switch_to_buffer(struct yy_buffer_state *new_buffer) = 0;
virtual struct yy_buffer_state *yy_create_buffer(FLEX_STD istream *s, int size) = 0;
virtual void yy_delete_buffer(struct yy_buffer_state *b) = 0;
virtual void yyrestart(FLEX_STD istream *s) = 0;
virtual int yylex() = 0;
// Call yylex with new input/output sources.
int yylex(FLEX_STD istream *new_in, FLEX_STD ostream *new_out = 0)
{
switch_streams(new_in, new_out);
return yylex();
}
// Switch to new input/output streams. A nil stream pointer
// indicates "keep the current one".
virtual void switch_streams(FLEX_STD istream *new_in = 0, FLEX_STD ostream *new_out = 0) = 0;
int lineno() const { return yylineno; }
int debug() const { return yy_flex_debug; }
void set_debug(int flag) { yy_flex_debug = flag; }
protected:
char *yytext;
int yyleng;
int yylineno; // only maintained if you use %option yylineno
int yy_flex_debug; // only has effect with -d or "%option debug"
};
}
#endif // FLEXLEXER_H
//#if defined(yyFlexLexer) || ! defined(yyFlexLexerOnce)
// had to disable the 'defined(yyFlexLexer)' part because it was causing duplicate class defs
#if !defined(yyFlexLexerOnce)
// Either this is the first time through (yyFlexLexerOnce not defined),
// or this is a repeated include to define a different flavor of
// yyFlexLexer, as discussed in the flex manual.
#define yyFlexLexerOnce
extern "C++" {
class yyFlexLexer : public FlexLexer
{
public:
// arg_yyin and arg_yyout default to the cin and cout, but we
// only make that assignment when initializing in yylex().
yyFlexLexer(FLEX_STD istream *arg_yyin = 0, FLEX_STD ostream *arg_yyout = 0);
virtual ~yyFlexLexer();
void yy_switch_to_buffer(struct yy_buffer_state *new_buffer);
struct yy_buffer_state *yy_create_buffer(FLEX_STD istream *s, int size);
void yy_delete_buffer(struct yy_buffer_state *b);
void yyrestart(FLEX_STD istream *s);
void yypush_buffer_state(struct yy_buffer_state *new_buffer);
void yypop_buffer_state();
virtual int yylex();
virtual void switch_streams(FLEX_STD istream *new_in, FLEX_STD ostream *new_out = 0);
virtual int yywrap();
protected:
virtual size_t LexerInput(char *buf, size_t max_size);
virtual void LexerOutput(const char *buf, size_t size);
virtual void LexerError(const char *msg);
void yyunput(int c, char *buf_ptr);
int yyinput();
void yy_load_buffer_state();
void yy_init_buffer(struct yy_buffer_state *b, FLEX_STD istream *s);
void yy_flush_buffer(struct yy_buffer_state *b);
int yy_start_stack_ptr;
int yy_start_stack_depth;
int *yy_start_stack;
void yy_push_state(int new_state);
void yy_pop_state();
int yy_top_state();
yy_state_type yy_get_previous_state();
yy_state_type yy_try_NUL_trans(yy_state_type current_state);
int yy_get_next_buffer();
FLEX_STD istream *yyin; // input source for default LexerInput
FLEX_STD ostream *yyout; // output sink for default LexerOutput
// yy_hold_char holds the character lost when yytext is formed.
char yy_hold_char;
// Number of characters read into yy_ch_buf.
int yy_n_chars;
// Points to current character in buffer.
char *yy_c_buf_p;
int yy_init; // whether we need to initialize
int yy_start; // start state number
// Flag which is used to allow yywrap()'s to do buffer switches
// instead of setting up a fresh yyin. A bit of a hack ...
int yy_did_buffer_switch_on_eof;
size_t yy_buffer_stack_top;
size_t yy_buffer_stack_max;
struct yy_buffer_state **yy_buffer_stack;
void yyensure_buffer_stack(void);
// The following are not always needed, but may be depending
// on use of certain flex features (like REJECT or yymore()).
yy_state_type yy_last_accepting_state;
char *yy_last_accepting_cpos;
yy_state_type *yy_state_buf;
yy_state_type *yy_state_ptr;
char *yy_full_match;
int *yy_full_state;
int yy_full_lp;
int yy_lp;
int yy_looking_for_trail_begin;
int yy_more_flag;
int yy_more_len;
int yy_more_offset;
int yy_prev_more_offset;
};
}
#endif // yyFlexLexer || ! yyFlexLexerOnce
yyFlexLexer::yy_buffer_stack
struct yy_buffer_state ** yy_buffer_stack
Definition: FlexLexer.h:173
yyFlexLexer::yy_buffer_stack_top
size_t yy_buffer_stack_top
Definition: FlexLexer.h:171
yyFlexLexer::yy_buffer_stack_max
size_t yy_buffer_stack_max
Definition: FlexLexer.h:172
FlexLexer
Definition: FlexLexer.h:61
ostream
Definition: apps/elftosb/common/options.cpp:61
yy_buffer_state
Definition: elftosb_lexer.cpp:212
yyFlexLexer
Definition: FlexLexer.h:107