1/*
2 [The "BSD license"]
3 Copyright (c) 2005-2009 Terence Parr
4 All rights reserved.
5
6 Redistribution and use in source and binary forms, with or without
7 modification, are permitted provided that the following conditions
8 are met:
9 1. Redistributions of source code must retain the above copyright
10 notice, this list of conditions and the following disclaimer.
11 2. Redistributions in binary form must reproduce the above copyright
12 notice, this list of conditions and the following disclaimer in the
13 documentation and/or other materials provided with the distribution.
14 3. The name of the author may not be used to endorse or promote products
15 derived from this software without specific prior written permission.
16
17 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** This is a char buffer stream that is loaded from a file
30 *  all at once when you construct the object.  This looks very
31 *  much like an ANTLReader or ANTLRInputStream, but it's a special case
32 *  since we know the exact size of the object to load.  We can avoid lots
33 *  of data copying.
34 */
35
36#import "ANTLRFileStream.h"
37
38@implementation ANTLRFileStream
39
40@synthesize fileName;
41
42+ (id) newANTLRFileStream:(NSString*)fileName
43{
44    return [[ANTLRFileStream alloc] init:fileName];
45}
46
47+ (id) newANTLRFileStream:(NSString *)aFileName encoding:(NSStringEncoding)encoding
48{
49    return [[ANTLRFileStream alloc] init:aFileName encoding:encoding];
50}
51
52- (id) init:(NSString *)aFileName
53{
54    self = [super init];
55    if ( self != nil ) {
56        fileName = aFileName;
57        [self load:aFileName encoding:NSUTF8StringEncoding];
58    }
59    return self;
60}
61
62- (id) init:(NSString *) aFileName encoding:(NSStringEncoding)encoding
63{
64    self = [super init];
65    if ( self != nil ) {
66        fileName = aFileName;
67        [self load:aFileName encoding:encoding];
68    }
69    return self;
70}
71
72- (NSString *) getSourceName
73{
74    return fileName;
75}
76
77- (void) load:(NSString *)aFileName encoding:(NSStringEncoding)encoding
78{
79    if ( aFileName==nil ) {
80        return;
81    }
82    NSError *error;
83    NSData *retData = nil;
84    NSFileHandle *fh;
85    @try {
86        NSString *fn = [aFileName stringByStandardizingPath];
87        NSURL *f = [NSURL fileURLWithPath:fn];
88        fh = [NSFileHandle fileHandleForReadingFromURL:f error:&error];
89        if ( fh==nil ) {
90            return;
91        }
92        int numRead=0;
93        int p1 = 0;
94        retData = [fh readDataToEndOfFile];
95        numRead = [retData length];
96#pragma mark fix these NSLog calls
97        NSLog( @"read %d chars; p was %d is now %d", n, p1, (p1+numRead) );
98        p1 += numRead;
99        n = p1;
100        data = [[NSString alloc] initWithData:retData encoding:NSASCIIStringEncoding];
101#pragma mark fix these NSLog calls
102        NSLog( @"n=%d", n );
103    }
104    @finally {
105        [fh closeFile];
106    }
107}
108
109@end
110