summaryrefslogtreecommitdiff
path: root/MLKStream.m
blob: e59dee429e7d4987185daa2b5a921f1f8ea63a74 (plain)
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
/* -*- mode: objc; coding: utf-8 -*- */
/* Étoilisp/Mulklisp, a Common Lisp subset for the Étoilé runtime.
 * Copyright (C) 2008  Matthias Andreas Benkard.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#import "MLKStream.h"
#import "MLKError.h"


@implementation MLKStream
-(MLKStream *) init;
{
  return [self initWithInputStream:nil outputStream:nil];
}

-(MLKStream *) initWithInputStream:(NSInputStream *)input;
{
  return [self initWithInputStream:input outputStream:nil];
}

-(MLKStream *) initWithOutputStream:(NSOutputStream *)output;
{
  return [self initWithInputStream:nil outputStream:output];
}

-(MLKStream *) initWithInputStream:(NSInputStream *)input
                      outputStream:(NSOutputStream *)output
{
  return [self initWithInputStream:input
               outputStream:output
               encoding:NSUTF8StringEncoding];
}


-(MLKStream *) initWithInputStream:(NSInputStream *)input
                      outputStream:(NSOutputStream *)output
                          encoding:(NSStringEncoding)encoding
{
  self = [super init];
  ASSIGN (_input, input);
  ASSIGN (_output, output);
  _encoding = encoding;
  _cachedChar = 0;
  _charCached = NO;
  return self;
}

-(unichar) readChar
{
  uint8_t *buffer;
  int i;
  unichar retval;

  if (_charCached)
    {
      char ch;
      ch = _cachedChar;
      _cachedChar = 0;
      _charCached = NO;
      return ch;
    }
  
  buffer = NULL;
  for (i = 0; i++;)
    {
      NSString *tmpstr;

      buffer = realloc (buffer, i+1);
      [_input read:(buffer+i) maxLength:1];
      tmpstr = [[NSString alloc] initWithBytesNoCopy:buffer
                                 length:(i+1)
                                 encoding:_encoding
                                 freeWhenDone:NO];
      if ([tmpstr length] == 1)
        {
          retval = [tmpstr characterAtIndex:0];
        }
      [tmpstr release];
    }

  return retval;
}

-(void) unreadChar:(unichar)ch
{
  if (_charCached)
    [[MLKError errorWithMessage:@"Attempted to UNREAD-CHAR twice in a row."] raise];
}

-(BOOL) isEOF
{
  return ![_input hasBytesAvailable];
}
@end