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110 lines
3.4 KiB
110 lines
3.4 KiB
4 months ago
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/*
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[The "BSD license"]
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Copyright (c) 2005-2009 Terence Parr
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/** This is a char buffer stream that is loaded from a file
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* all at once when you construct the object. This looks very
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* much like an ANTLRReader or ANTLRInputStream, but it's a special case
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* since we know the exact size of the object to load. We can avoid lots
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* of data copying.
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*/
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#import "ANTLRFileStream.h"
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@implementation ANTLRFileStream
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@synthesize fileName;
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+ (id) newANTLRFileStream:(NSString*)fileName
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{
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return [[ANTLRFileStream alloc] init:fileName];
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}
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+ (id) newANTLRFileStream:(NSString *)aFileName encoding:(NSStringEncoding)encoding
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{
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return [[ANTLRFileStream alloc] init:aFileName encoding:encoding];
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}
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- (id) init:(NSString *)aFileName
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{
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self = [super init];
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if ( self != nil ) {
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fileName = aFileName;
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[self load:aFileName encoding:NSUTF8StringEncoding];
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}
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return self;
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}
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- (id) init:(NSString *) aFileName encoding:(NSStringEncoding)encoding
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{
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self = [super init];
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if ( self != nil ) {
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fileName = aFileName;
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[self load:aFileName encoding:encoding];
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}
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return self;
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}
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- (NSString *) getSourceName
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{
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return fileName;
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}
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- (void) load:(NSString *)aFileName encoding:(NSStringEncoding)encoding
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{
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if ( aFileName==nil ) {
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return;
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}
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NSError *error;
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NSData *retData = nil;
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NSFileHandle *fh;
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@try {
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NSString *fn = [aFileName stringByStandardizingPath];
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NSURL *f = [NSURL fileURLWithPath:fn];
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fh = [NSFileHandle fileHandleForReadingFromURL:f error:&error];
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if ( fh==nil ) {
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return;
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}
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int numRead=0;
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int p1 = 0;
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retData = [fh readDataToEndOfFile];
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numRead = [retData length];
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#pragma mark fix these NSLog calls
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NSLog( @"read %d chars; p was %d is now %d", n, p1, (p1+numRead) );
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p1 += numRead;
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n = p1;
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data = [[NSString alloc] initWithData:retData encoding:NSASCIIStringEncoding];
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#pragma mark fix these NSLog calls
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NSLog( @"n=%d", n );
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}
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@finally {
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[fh closeFile];
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}
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}
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@end
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