1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
// This is part of the iostream library, providing -*- C++ -*- input/output.
// Copyright (C) 1991 Per Bothner.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free
// Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// $Id: parsestream.h,v 1.1 1995/10/18 08:38:13 deraadt Exp $
#ifndef PARSESTREAM_H
#define PARSESTREAM_H
#ifdef __GNUG__
#pragma interface
#endif
#include "streambuf.h"
// A parsebuf is a streambuf optimized for scanning text files.
// It keeps track of line and column numbers.
// It is guaranteed to remember the entire current line,
// as well the '\n'-s on either side of it (if they exist).
// You can arbitrarily seek (or unget) within this extended line.
// Other backward seeks are not supported.
// Normal read semantics are supported (and hence istream operators like >>).
class parsebuf : public backupbuf {
protected:
_G_fpos_t pos_at_line_start;
long _line_length;
unsigned long __line_number;
char *buf_start;
char *buf_end;
public:
parsebuf *chain;
// Return column number (raw - don't handle tabs etc).
// Retult can be -1, meaning: at '\n' before current line.
virtual int tell_in_line();
// seek to (raw) column I in current line.
// Result is new (raw) column position - differs from I if unable to seek.
// Seek to -1 tries to seek to before previous LF.
virtual int seek_in_line(int i);
// Note: there is no "current line" initially, until something is read.
// Current line number, starting with 0.
// If tell_in_line()==-1, then line number of next line.
int line_number() { return __line_number; }
// Length of current line, not counting either '\n'.
int line_length() { return _line_length; }
// Current line - not a copy, so file ops may trash it.
virtual char* current_line();
virtual streampos seekoff(streamoff, _seek_dir, int mode=ios::in|ios::out);
virtual streambuf* setbuf(char* p, int len);
protected:
parsebuf() : backupbuf() { chain= NULL;
__line_number = 0; pos_at_line_start = 0; _line_length = -1; }
virtual int pbackfail(int c);
};
// A string_parsebuf is a parsebuf whose source is a fixed string.
class string_parsebuf : public parsebuf {
public:
int do_delete;
string_parsebuf(char *str, int len, int delete_at_close=0);
virtual int underflow();
virtual char* current_line();
virtual int seek_in_line(int i);
virtual int tell_in_line();
char *left() const { return base(); }
char *right() const { return ebuf(); }
// streampos seekoff(streamoff, _seek_dir, int);
};
// A func_parsebuf calls a given function to get new input.
// Each call returns an entire NUL-terminated line (without the '\n').
// That line has been allocated with malloc(), not new.
// The interface is tailored to the GNU readline library.
// Example:
// char* DoReadLine(void* arg)
// {
// char *line = readline((char*)arg); /* 'arg' is used as prompt. */
// if line == NULL) { putc('\n', stderr); return NULL; }
// if (line[0] != '\0') add_history(line);
// return line;
// }
// char PromptBuffer[100] = "> ";
// func_parsebuf my_stream(DoReadLine, PromptBuffer);
typedef char *(*CharReader)(void *arg);
class istream;
class func_parsebuf : public parsebuf {
public:
void *arg;
CharReader read_func;
int backed_up_to_newline;
func_parsebuf(CharReader func, void *argm = NULL);
int underflow();
virtual int tell_in_line();
virtual int seek_in_line(int i);
virtual char* current_line();
};
// A general_parsebuf is a parsebuf which gets its input from some
// other streambuf. It explicitly buffers up an entire line.
class general_parsebuf : public parsebuf {
public:
streambuf *sbuf;
int delete_buf; // Delete sbuf when destroying this.
general_parsebuf(streambuf *buf, int delete_arg_buf = 0);
int underflow();
virtual int tell_in_line();
virtual int seek_in_line(int i);
~general_parsebuf();
virtual char* current_line();
};
#if 0
class parsestream : public istream {
streammarker marks[2];
short _first; // of the two marks; either 0 or 1
int _lineno;
int first() { return _first; }
int second() { return 1-_first; }
int line_length() { marks[second].delta(marks[first]); }
int line_length() { marks[second].delta(marks[first]); }
int seek_in_line(int i);
int tell_in_line();
int line_number();
};
#endif
#endif /*!defined(PARSESTREAM_H)*/
|
