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      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